refactor(monorepo): extract inbox and orch runtimes

packages/inbox-runtime/cmd/inbox/main.go

@@ -0,0 +1,11 @@
+package main
+
+import (
+	"os"
+
+	inboxcli "ai-workflow-skill/packages/inbox-runtime/internal/cli/inbox"
+)
+
+func main() {
+	os.Exit(inboxcli.Execute(os.Args[1:], os.Stdout, os.Stderr))
+}

packages/inbox-runtime/go.mod

@@ -1,3 +1,7 @@
 module ai-workflow-skill/packages/inbox-runtime
 
 go 1.26
+
+require (
+	github.com/spf13/cobra v1.10.1
+)

packages/inbox-runtime/internal/cli/inbox/artifact.go

@@ -0,0 +1,78 @@
+package inbox
+
+import (
+	"strings"
+
+	"ai-workflow-skill/packages/coord-core/protocol"
+	"ai-workflow-skill/packages/coord-core/store"
+
+	"github.com/spf13/cobra"
+)
+
+type artifactOptions struct {
+	paths         []string
+	kinds         []string
+	metadataJSONs []string
+}
+
+func addArtifactFlags(cmd *cobra.Command, opts *artifactOptions) {
+	cmd.Flags().StringArrayVar(&opts.paths, "artifact", nil, "Artifact path to attach; may be repeated")
+	cmd.Flags().StringArrayVar(&opts.kinds, "artifact-kind", nil, "Artifact kind; one value applies to all, or match artifact count")
+	cmd.Flags().StringArrayVar(&opts.metadataJSONs, "artifact-metadata-json", nil, "Artifact metadata JSON; one value applies to all, or match artifact count")
+}
+
+func resolveArtifacts(opts artifactOptions) ([]store.ArtifactInput, error) {
+	if len(opts.paths) == 0 {
+		if len(opts.kinds) > 0 || len(opts.metadataJSONs) > 0 {
+			return nil, protocol.InvalidInput("artifact-kind and artifact-metadata-json require at least one artifact path", nil)
+		}
+		return nil, nil
+	}
+
+	kinds, err := expandArtifactValues(opts.kinds, len(opts.paths), "artifact-kind")
+	if err != nil {
+		return nil, err
+	}
+	metadataJSONs, err := expandArtifactValues(opts.metadataJSONs, len(opts.paths), "artifact-metadata-json")
+	if err != nil {
+		return nil, err
+	}
+
+	artifacts := make([]store.ArtifactInput, 0, len(opts.paths))
+	for i, path := range opts.paths {
+		if strings.TrimSpace(path) == "" {
+			return nil, protocol.InvalidInput("artifact path cannot be empty", nil)
+		}
+
+		artifact := store.ArtifactInput{
+			Path: path,
+			Kind: "file",
+		}
+		if len(kinds) > 0 {
+			artifact.Kind = kinds[i]
+		}
+		if len(metadataJSONs) > 0 {
+			artifact.MetadataJSON = metadataJSONs[i]
+		}
+		artifacts = append(artifacts, artifact)
+	}
+
+	return artifacts, nil
+}
+
+func expandArtifactValues(values []string, target int, flagName string) ([]string, error) {
+	switch len(values) {
+	case 0:
+		return nil, nil
+	case 1:
+		out := make([]string, target)
+		for i := range out {
+			out[i] = values[0]
+		}
+		return out, nil
+	case target:
+		return values, nil
+	default:
+		return nil, protocol.InvalidInput(flagName+" must be specified once or once per artifact", nil)
+	}
+}

packages/inbox-runtime/internal/cli/inbox/body.go

@@ -0,0 +1,22 @@
+package inbox
+
+import (
+	"os"
+
+	"ai-workflow-skill/packages/coord-core/protocol"
+)
+
+func resolveBodyValue(body, bodyFile string) (string, error) {
+	if body != "" && bodyFile != "" {
+		return "", protocol.InvalidInput("body and body-file are mutually exclusive", nil)
+	}
+	if bodyFile == "" {
+		return body, nil
+	}
+
+	content, err := os.ReadFile(bodyFile)
+	if err != nil {
+		return "", protocol.InvalidInput("failed to read body-file", err)
+	}
+	return string(content), nil
+}

packages/inbox-runtime/internal/cli/inbox/cancel.go

@@ -0,0 +1,83 @@
+package inbox
+
+import (
+	"fmt"
+
+	"ai-workflow-skill/packages/coord-core/protocol"
+	"ai-workflow-skill/packages/coord-core/store"
+
+	"github.com/spf13/cobra"
+)
+
+type cancelOptions struct {
+	agent     string
+	threadID  string
+	reason    string
+	artifacts artifactOptions
+}
+
+func newCancelCmd(root *rootOptions) *cobra.Command {
+	opts := &cancelOptions{}
+
+	cmd := &cobra.Command{
+		Use:   "cancel",
+		Short: "Cancel a thread",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			ctx := cmd.Context()
+
+			agent := opts.agent
+			if agent == "" {
+				agent = root.agent
+			}
+			if agent == "" {
+				return protocol.InvalidInput("agent is required", nil)
+			}
+			artifacts, err := resolveArtifacts(opts.artifacts)
+			if err != nil {
+				return err
+			}
+
+			sqlDB, err := openInboxDB(ctx, root.dbPath)
+			if err != nil {
+				return err
+			}
+			defer sqlDB.Close()
+
+			s := store.NewInboxStore(sqlDB)
+			thread, message, err := s.CancelThread(ctx, store.CancelInput{
+				ThreadID:  opts.threadID,
+				Agent:     agent,
+				Reason:    opts.reason,
+				Artifacts: artifacts,
+			})
+			if err != nil {
+				return err
+			}
+
+			resp := protocol.Success{
+				OK:      true,
+				Command: "cancel",
+				Data: map[string]any{
+					"thread":  thread,
+					"message": message,
+				},
+			}
+
+			if root.json {
+				return protocol.WriteJSON(cmd.OutOrStdout(), resp)
+			}
+
+			_, err = fmt.Fprintf(cmd.OutOrStdout(), "cancelled thread %s\n", thread.ThreadID)
+			return err
+		},
+	}
+
+	cmd.Flags().StringVar(&opts.agent, "agent", "", "Acting agent")
+	cmd.Flags().StringVar(&opts.threadID, "thread", "", "Thread ID")
+	cmd.Flags().StringVar(&opts.reason, "reason", "", "Cancellation reason")
+	addArtifactFlags(cmd, &opts.artifacts)
+
+	_ = cmd.MarkFlagRequired("thread")
+
+	return cmd
+}

packages/inbox-runtime/internal/cli/inbox/cancel_integration_test.go

@@ -0,0 +1,148 @@
+package inbox
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestCancelMarksThreadCancelled(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	runInboxCommand(t, "--db", dbPath, "--json", "init")
+
+	sendOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", "leader",
+		"--to", "worker-a",
+		"--subject", "Implement cancellation",
+		"--summary", "Initial request",
+	)
+
+	var sendResp map[string]any
+	mustDecodeJSON(t, sendOut, &sendResp)
+	threadID := nestedString(t, sendResp, "data", "thread", "thread_id")
+
+	cancelOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"cancel",
+		"--agent", "leader",
+		"--thread", threadID,
+		"--reason", "Task superseded by a larger refactor",
+	)
+
+	var cancelResp map[string]any
+	mustDecodeJSON(t, cancelOut, &cancelResp)
+	if status := nestedString(t, cancelResp, "data", "thread", "status"); status != "cancelled" {
+		t.Fatalf("expected cancelled thread, got %q", status)
+	}
+	if kind := nestedString(t, cancelResp, "data", "message", "kind"); kind != "control" {
+		t.Fatalf("expected control message, got %q", kind)
+	}
+}
+
+func TestCancelPersistsReasonAndArtifact(t *testing.T) {
+	t.Parallel()
+
+	tempDir := t.TempDir()
+	dbPath := filepath.Join(tempDir, "coord.db")
+	cancelPath := filepath.Join(tempDir, "cancel.md")
+	if err := os.WriteFile(cancelPath, []byte("Cancelled by product decision"), 0o644); err != nil {
+		t.Fatalf("write cancel artifact: %v", err)
+	}
+
+	runInboxCommand(t, "--db", dbPath, "--json", "init")
+
+	sendOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", "leader",
+		"--to", "worker-a",
+		"--subject", "Implement cancellation",
+		"--summary", "Initial request",
+	)
+
+	var sendResp map[string]any
+	mustDecodeJSON(t, sendOut, &sendResp)
+	threadID := nestedString(t, sendResp, "data", "thread", "thread_id")
+
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"cancel",
+		"--agent", "leader",
+		"--thread", threadID,
+		"--reason", "Task superseded by a larger refactor",
+		"--artifact", cancelPath,
+		"--artifact-kind", "brief",
+	)
+
+	showOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"show",
+		"--thread", threadID,
+	)
+	var showResp map[string]any
+	mustDecodeJSON(t, showOut, &showResp)
+
+	messages, ok := nestedValue(t, showResp, "data", "messages").([]any)
+	if !ok || len(messages) == 0 {
+		t.Fatalf("expected non-empty message history, got %#v", nestedValue(t, showResp, "data", "messages"))
+	}
+
+	lastMessage, ok := messages[len(messages)-1].(map[string]any)
+	if !ok {
+		t.Fatalf("expected message object, got %#v", messages[len(messages)-1])
+	}
+	if got := lastMessage["summary"]; got != "Task superseded by a larger refactor" {
+		t.Fatalf("expected cancel summary, got %#v", got)
+	}
+	if got := lastMessage["body"]; got != "Task superseded by a larger refactor" {
+		t.Fatalf("expected cancel body, got %#v", got)
+	}
+	artifacts, ok := lastMessage["artifacts"].([]any)
+	if !ok || len(artifacts) != 1 {
+		t.Fatalf("expected one cancel artifact, got %#v", lastMessage["artifacts"])
+	}
+	artifact, ok := artifacts[0].(map[string]any)
+	if !ok {
+		t.Fatalf("expected artifact object, got %#v", artifacts[0])
+	}
+	if got := artifact["path"]; got != cancelPath {
+		t.Fatalf("expected artifact path %q, got %#v", cancelPath, got)
+	}
+	if got := artifact["kind"]; got != "brief" {
+		t.Fatalf("expected artifact kind brief, got %#v", got)
+	}
+}
+
+func TestCancelRejectsWhenThreadMissing(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	runInboxCommand(t, "--db", dbPath, "--json", "init")
+
+	stdout, _, exitCode := executeInboxCommand(
+		"--db", dbPath,
+		"--agent", "leader",
+		"--json",
+		"cancel",
+		"--thread", "thr_missing",
+	)
+	if exitCode != 40 {
+		t.Fatalf("expected not-found exit code 40, got %d with %s", exitCode, stdout)
+	}
+	assertErrorJSON(t, stdout, "not_found")
+}
+

packages/inbox-runtime/internal/cli/inbox/claim.go

@@ -0,0 +1,80 @@
+package inbox
+
+import (
+	"errors"
+	"fmt"
+
+	"ai-workflow-skill/packages/coord-core/protocol"
+	"ai-workflow-skill/packages/coord-core/store"
+
+	"github.com/spf13/cobra"
+)
+
+type claimOptions struct {
+	agent        string
+	threadID     string
+	leaseSeconds int
+}
+
+func newClaimCmd(root *rootOptions) *cobra.Command {
+	opts := &claimOptions{}
+
+	cmd := &cobra.Command{
+		Use:   "claim",
+		Short: "Acquire a lease on a pending thread",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			ctx := cmd.Context()
+
+			agent := opts.agent
+			if agent == "" {
+				agent = root.agent
+			}
+			if agent == "" {
+				return protocol.InvalidInput("agent is required", nil)
+			}
+
+			sqlDB, err := openInboxDB(ctx, root.dbPath)
+			if err != nil {
+				return err
+			}
+			defer sqlDB.Close()
+
+			s := store.NewInboxStore(sqlDB)
+			result, err := s.ClaimThread(ctx, store.ClaimInput{
+				ThreadID:     opts.threadID,
+				Agent:        agent,
+				LeaseSeconds: opts.leaseSeconds,
+			})
+			if err != nil {
+				if errors.Is(err, store.ErrLeaseConflict) {
+					return fmt.Errorf("lease conflict: %w", err)
+				}
+				return err
+			}
+
+			resp := protocol.Success{
+				OK:      true,
+				Command: "claim",
+				Data: map[string]any{
+					"thread":  result.Thread,
+					"message": result.Message,
+				},
+			}
+
+			if root.json {
+				return protocol.WriteJSON(cmd.OutOrStdout(), resp)
+			}
+
+			_, err = fmt.Fprintf(cmd.OutOrStdout(), "claimed thread %s\n", result.Thread.ThreadID)
+			return err
+		},
+	}
+
+	cmd.Flags().StringVar(&opts.agent, "agent", "", "Claiming agent")
+	cmd.Flags().StringVar(&opts.threadID, "thread", "", "Thread ID")
+	cmd.Flags().IntVar(&opts.leaseSeconds, "lease-seconds", 900, "Lease duration in seconds")
+
+	_ = cmd.MarkFlagRequired("thread")
+
+	return cmd
+}

packages/inbox-runtime/internal/cli/inbox/claim_integration_test.go

@@ -0,0 +1,112 @@
+package inbox
+
+import "testing"
+
+func TestClaimAcquiresThreadLease(t *testing.T) {
+	t.Parallel()
+
+	dbPath := initCommandTestDB(t)
+	threadID := sendPendingThread(t, dbPath, "leader", "worker-a", "Race claim", "Claim this task")
+
+	claimOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"claim",
+		"--agent", "worker-a",
+		"--thread", threadID,
+		"--lease-seconds", "300",
+	)
+
+	var claimResp map[string]any
+	mustDecodeJSON(t, claimOut, &claimResp)
+	if got := nestedString(t, claimResp, "data", "thread", "status"); got != "claimed" {
+		t.Fatalf("expected claimed status, got %q", got)
+	}
+	if got := nestedString(t, claimResp, "data", "thread", "assigned_to"); got != "worker-a" {
+		t.Fatalf("expected assigned_to worker-a, got %q", got)
+	}
+	if got := nestedString(t, claimResp, "data", "message", "kind"); got != "event" {
+		t.Fatalf("expected event message kind, got %q", got)
+	}
+	if got := nestedString(t, claimResp, "data", "message", "summary"); got != "thread claimed" {
+		t.Fatalf("expected summary thread claimed, got %q", got)
+	}
+}
+
+func TestClaimRejectsWhenThreadMissing(t *testing.T) {
+	t.Parallel()
+
+	dbPath := initCommandTestDB(t)
+	stdout, _, exitCode := executeInboxCommand(
+		"--db", dbPath,
+		"--json",
+		"claim",
+		"--agent", "worker-z",
+		"--thread", "thr_missing",
+	)
+	if exitCode != 40 {
+		t.Fatalf("expected exit code 40, got %d", exitCode)
+	}
+	assertErrorJSON(t, stdout, "not_found")
+}
+
+func TestClaimRejectsWhenThreadAlreadyClaimed(t *testing.T) {
+	t.Parallel()
+
+	dbPath := initCommandTestDB(t)
+	threadID := sendPendingThread(t, dbPath, "leader", "worker-z", "Claimed task", "Already claimed")
+
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"claim",
+		"--agent", "worker-z",
+		"--thread", threadID,
+	)
+
+	stdout, _, exitCode := executeInboxCommand(
+		"--db", dbPath,
+		"--json",
+		"claim",
+		"--agent", "worker-y",
+		"--thread", threadID,
+	)
+	if exitCode != 20 {
+		t.Fatalf("expected exit code 20, got %d", exitCode)
+	}
+	assertErrorJSON(t, stdout, "lease_conflict")
+}
+
+func TestClaimRecordsRequestedLeaseDuration(t *testing.T) {
+	t.Parallel()
+
+	dbPath := initCommandTestDB(t)
+	threadID := sendPendingThread(t, dbPath, "leader", "worker-a", "Lease payload", "Verify lease payload")
+
+	claimOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"claim",
+		"--agent", "worker-a",
+		"--thread", threadID,
+		"--lease-seconds", "300",
+	)
+
+	var claimResp map[string]any
+	mustDecodeJSON(t, claimOut, &claimResp)
+	payload, ok := nestedValue(t, claimResp, "data", "message", "payload_json").(map[string]any)
+	if !ok {
+		t.Fatalf("expected payload_json object, got %#v", nestedValue(t, claimResp, "data", "message", "payload_json"))
+	}
+	leaseSeconds, ok := payload["lease_seconds"].(float64)
+	if !ok || int(leaseSeconds) != 300 {
+		t.Fatalf("expected lease_seconds 300, got %#v", payload["lease_seconds"])
+	}
+	leaseToken, _ := payload["lease_token"].(string)
+	if leaseToken == "" {
+		t.Fatalf("expected non-empty lease_token, got %#v", payload["lease_token"])
+	}
+}

packages/inbox-runtime/internal/cli/inbox/db.go

@@ -0,0 +1,22 @@
+package inbox
+
+import (
+	"context"
+	"database/sql"
+
+	"ai-workflow-skill/packages/coord-core/db"
+)
+
+func openInboxDB(ctx context.Context, dbPath string) (*sql.DB, error) {
+	sqlDB, err := db.Open(ctx, dbPath)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := db.ApplyMigrations(ctx, sqlDB); err != nil {
+		_ = sqlDB.Close()
+		return nil, err
+	}
+
+	return sqlDB, nil
+}

packages/inbox-runtime/internal/cli/inbox/done.go

@@ -0,0 +1,106 @@
+package inbox
+
+import (
+	"fmt"
+
+	"ai-workflow-skill/packages/coord-core/protocol"
+	"ai-workflow-skill/packages/coord-core/store"
+
+	"github.com/spf13/cobra"
+)
+
+type completeOptions struct {
+	agent       string
+	threadID    string
+	summary     string
+	body        string
+	bodyFile    string
+	payloadJSON string
+	artifacts   artifactOptions
+}
+
+func newDoneCmd(root *rootOptions) *cobra.Command {
+	return newCompleteCmd(root, "done")
+}
+
+func newFailCmd(root *rootOptions) *cobra.Command {
+	return newCompleteCmd(root, "fail")
+}
+
+func newCompleteCmd(root *rootOptions, mode string) *cobra.Command {
+	opts := &completeOptions{}
+
+	cmd := &cobra.Command{
+		Use:   mode,
+		Short: map[string]string{"done": "Mark a thread complete", "fail": "Mark a thread failed"}[mode],
+		RunE: func(cmd *cobra.Command, args []string) error {
+			ctx := cmd.Context()
+
+			agent := opts.agent
+			if agent == "" {
+				agent = root.agent
+			}
+			if agent == "" {
+				return protocol.InvalidInput("agent is required", nil)
+			}
+
+			body, err := resolveBodyValue(opts.body, opts.bodyFile)
+			if err != nil {
+				return err
+			}
+			artifacts, err := resolveArtifacts(opts.artifacts)
+			if err != nil {
+				return err
+			}
+
+			sqlDB, err := openInboxDB(ctx, root.dbPath)
+			if err != nil {
+				return err
+			}
+			defer sqlDB.Close()
+
+			s := store.NewInboxStore(sqlDB)
+			thread, message, err := s.CompleteThread(ctx, store.CompleteInput{
+				ThreadID:    opts.threadID,
+				Agent:       agent,
+				Summary:     opts.summary,
+				Body:        body,
+				PayloadJSON: opts.payloadJSON,
+				Failed:      mode == "fail",
+				Artifacts:   artifacts,
+			})
+			if err != nil {
+				return err
+			}
+
+			resp := protocol.Success{
+				OK:      true,
+				Command: mode,
+				Data: map[string]any{
+					"thread":  thread,
+					"message": message,
+				},
+			}
+
+			if root.json {
+				return protocol.WriteJSON(cmd.OutOrStdout(), resp)
+			}
+
+			_, err = fmt.Fprintf(cmd.OutOrStdout(), "%s thread %s\n", mode, thread.ThreadID)
+			return err
+		},
+	}
+
+	cmd.Flags().StringVar(&opts.agent, "agent", "", "Acting agent")
+	cmd.Flags().StringVar(&opts.threadID, "thread", "", "Thread ID")
+	cmd.Flags().StringVar(&opts.summary, "summary", "", "Short completion summary")
+	cmd.Flags().StringVar(&opts.body, "body", "", "Completion body")
+	cmd.Flags().StringVar(&opts.bodyFile, "body-file", "", "Read completion body from file")
+	cmd.Flags().StringVar(&opts.payloadJSON, "payload-json", "", "Structured payload JSON string")
+	addArtifactFlags(cmd, &opts.artifacts)
+
+	_ = cmd.MarkFlagRequired("thread")
+	_ = cmd.MarkFlagRequired("summary")
+
+	return cmd
+}

packages/inbox-runtime/internal/cli/inbox/done_integration_test.go

@@ -0,0 +1,140 @@
+package inbox
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestDoneMarksThreadTerminal(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	threadID := seedClaimedThreadForInboxTests(t, dbPath, "leader", "worker-a", "worker-a")
+
+	doneOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"done",
+		"--agent", "worker-a",
+		"--thread", threadID,
+		"--summary", "Retry policy implemented",
+		"--body", "The HTTP client now retries the selected transient failures.",
+	)
+
+	var doneResp map[string]any
+	mustDecodeJSON(t, doneOut, &doneResp)
+	if status := nestedString(t, doneResp, "data", "thread", "status"); status != "done" {
+		t.Fatalf("expected done thread status, got %q", status)
+	}
+	if kind := nestedString(t, doneResp, "data", "message", "kind"); kind != "result" {
+		t.Fatalf("expected result message kind, got %q", kind)
+	}
+}
+
+func TestDonePersistsResultBodyAndArtifact(t *testing.T) {
+	t.Parallel()
+
+	tempDir := t.TempDir()
+	dbPath := filepath.Join(tempDir, "coord.db")
+	resultPath := filepath.Join(tempDir, "result.md")
+	body := "Result from body file."
+	if err := os.WriteFile(resultPath, []byte(body), 0o644); err != nil {
+		t.Fatalf("write result file: %v", err)
+	}
+
+	threadID := seedClaimedThreadForInboxTests(t, dbPath, "leader", "worker-a", "worker-a")
+
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"done",
+		"--agent", "worker-a",
+		"--thread", threadID,
+		"--summary", "Retry policy implemented",
+		"--body-file", resultPath,
+		"--artifact", resultPath,
+		"--artifact-kind", "report",
+	)
+
+	showOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"show",
+		"--thread", threadID,
+	)
+	var showResp map[string]any
+	mustDecodeJSON(t, showOut, &showResp)
+	lastMessage := lastThreadMessageFromShow(t, showResp)
+
+	if gotBody, _ := lastMessage["body"].(string); gotBody != body {
+		t.Fatalf("expected body %q, got %#v", body, lastMessage["body"])
+	}
+	artifacts, ok := lastMessage["artifacts"].([]any)
+	if !ok || len(artifacts) != 1 {
+		t.Fatalf("expected one artifact, got %#v", lastMessage["artifacts"])
+	}
+	artifact, ok := artifacts[0].(map[string]any)
+	if !ok {
+		t.Fatalf("expected artifact object, got %#v", artifacts[0])
+	}
+	if gotPath, _ := artifact["path"].(string); gotPath != resultPath {
+		t.Fatalf("expected artifact path %q, got %#v", resultPath, artifact["path"])
+	}
+	if gotKind, _ := artifact["kind"].(string); gotKind != "report" {
+		t.Fatalf("expected artifact kind report, got %#v", artifact["kind"])
+	}
+}
+
+func TestDoneRejectsNonOwner(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	threadID := seedClaimedThreadForInboxTests(t, dbPath, "leader", "worker-a", "worker-a")
+
+	stdout, _, exitCode := executeInboxCommand(
+		"--db", dbPath,
+		"--json",
+		"done",
+		"--agent", "worker-b",
+		"--thread", threadID,
+		"--summary", "Retry policy implemented",
+	)
+	if exitCode != 20 {
+		t.Fatalf("expected exit code 20, got %d with output %s", exitCode, stdout)
+	}
+	assertErrorJSON(t, stdout, "lease_conflict")
+}
+
+func TestDoneRejectsOnTerminalThread(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	threadID := seedClaimedThreadForInboxTests(t, dbPath, "leader", "worker-a", "worker-a")
+
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"done",
+		"--agent", "worker-a",
+		"--thread", threadID,
+		"--summary", "Retry policy implemented",
+	)
+
+	stdout, _, exitCode := executeInboxCommand(
+		"--db", dbPath,
+		"--json",
+		"done",
+		"--agent", "worker-a",
+		"--thread", threadID,
+		"--summary", "Retry policy implemented",
+	)
+	if exitCode != 30 {
+		t.Fatalf("expected exit code 30, got %d with output %s", exitCode, stdout)
+	}
+	assertErrorJSON(t, stdout, "invalid_state")
+}

packages/inbox-runtime/internal/cli/inbox/execute.go

@@ -0,0 +1,113 @@
+package inbox
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"strings"
+
+	"ai-workflow-skill/packages/coord-core/protocol"
+	"ai-workflow-skill/packages/coord-core/store"
+)
+
+func Execute(args []string, stdout, stderr io.Writer) int {
+	cmd := NewRootCmd()
+	cmd.SetOut(stdout)
+	cmd.SetErr(stderr)
+	cmd.SetArgs(args)
+
+	if err := cmd.Execute(); err != nil {
+		jsonOutput := hasJSONFlag(args)
+		renderError(stdout, stderr, jsonOutput, err)
+		return exitCodeForError(err)
+	}
+
+	return 0
+}
+
+func exitCodeForError(err error) int {
+	var cliErr *protocol.CLIError
+	if errors.As(err, &cliErr) {
+		return cliErr.ExitCode
+	}
+
+	switch {
+	case isUsageError(err):
+		return 30
+	case errors.Is(err, store.ErrLeaseConflict):
+		return 20
+	case errors.Is(err, store.ErrThreadNotFound), errors.Is(err, store.ErrMessageNotFound):
+		return 40
+	case errors.Is(err, store.ErrInvalidInput), errors.Is(err, store.ErrInvalidState), errors.Is(err, store.ErrNoActiveLease):
+		return 30
+	default:
+		return 50
+	}
+}
+
+func errorCodeForError(err error) string {
+	var cliErr *protocol.CLIError
+	if errors.As(err, &cliErr) {
+		return cliErr.Code
+	}
+
+	switch {
+	case isUsageError(err):
+		return "invalid_input"
+	case errors.Is(err, store.ErrLeaseConflict):
+		return "lease_conflict"
+	case errors.Is(err, store.ErrThreadNotFound), errors.Is(err, store.ErrMessageNotFound):
+		return "not_found"
+	case errors.Is(err, store.ErrInvalidInput):
+		return "invalid_input"
+	case errors.Is(err, store.ErrInvalidState), errors.Is(err, store.ErrNoActiveLease):
+		return "invalid_state"
+	default:
+		return "internal_error"
+	}
+}
+
+func renderError(stdout, stderr io.Writer, jsonOutput bool, err error) {
+	message := errorMessage(err)
+	if jsonOutput {
+		_ = protocol.WriteJSON(stdout, protocol.Error{
+			OK: false,
+			Error: protocol.ErrorPayload{
+				Code:    errorCodeForError(err),
+				Message: message,
+			},
+		})
+		return
+	}
+
+	_, _ = fmt.Fprintln(stderr, message)
+}
+
+func errorMessage(err error) string {
+	var cliErr *protocol.CLIError
+	if errors.As(err, &cliErr) {
+		return cliErr.Message
+	}
+	return err.Error()
+}
+
+func hasJSONFlag(args []string) bool {
+	for _, arg := range args {
+		if arg == "--json" {
+			return true
+		}
+		if strings.HasPrefix(arg, "--json=") {
+			return !strings.HasSuffix(arg, "=false")
+		}
+	}
+	return false
+}
+
+func isUsageError(err error) bool {
+	message := err.Error()
+	return strings.HasPrefix(message, "required flag(s)") ||
+		strings.HasPrefix(message, "unknown flag:") ||
+		strings.HasPrefix(message, "unknown command ") ||
+		strings.Contains(message, " accepts ") ||
+		strings.Contains(message, "invalid argument ")
+}

packages/inbox-runtime/internal/cli/inbox/fail_integration_test.go

@@ -0,0 +1,143 @@
+package inbox
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestFailMarksThreadFailed(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	threadID := seedClaimedThreadForInboxTests(t, dbPath, "leader", "worker-b", "worker-b")
+
+	failOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"fail",
+		"--agent", "worker-b",
+		"--thread", threadID,
+		"--summary", "Migration failed",
+		"--body", "The migration cannot proceed because the prior schema is inconsistent.",
+	)
+
+	var failResp map[string]any
+	mustDecodeJSON(t, failOut, &failResp)
+	if status := nestedString(t, failResp, "data", "thread", "status"); status != "failed" {
+		t.Fatalf("expected failed thread status, got %q", status)
+	}
+	if kind := nestedString(t, failResp, "data", "message", "kind"); kind != "result" {
+		t.Fatalf("expected result message kind, got %q", kind)
+	}
+	if toAgent := nestedString(t, failResp, "data", "message", "to_agent"); toAgent != "leader" {
+		t.Fatalf("expected message to_agent leader, got %q", toAgent)
+	}
+}
+
+func TestFailPersistsFailureBodyAndArtifact(t *testing.T) {
+	t.Parallel()
+
+	tempDir := t.TempDir()
+	dbPath := filepath.Join(tempDir, "coord.db")
+	failurePath := filepath.Join(tempDir, "failure.md")
+	body := "Failure details from file."
+	if err := os.WriteFile(failurePath, []byte(body), 0o644); err != nil {
+		t.Fatalf("write failure file: %v", err)
+	}
+
+	threadID := seedClaimedThreadForInboxTests(t, dbPath, "leader", "worker-b", "worker-b")
+
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"fail",
+		"--agent", "worker-b",
+		"--thread", threadID,
+		"--summary", "Migration failed",
+		"--body-file", failurePath,
+		"--artifact", failurePath,
+		"--artifact-kind", "report",
+	)
+
+	showOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"show",
+		"--thread", threadID,
+	)
+	var showResp map[string]any
+	mustDecodeJSON(t, showOut, &showResp)
+	lastMessage := lastThreadMessageFromShow(t, showResp)
+
+	if gotBody, _ := lastMessage["body"].(string); gotBody != body {
+		t.Fatalf("expected body %q, got %#v", body, lastMessage["body"])
+	}
+	artifacts, ok := lastMessage["artifacts"].([]any)
+	if !ok || len(artifacts) != 1 {
+		t.Fatalf("expected one artifact, got %#v", lastMessage["artifacts"])
+	}
+	artifact, ok := artifacts[0].(map[string]any)
+	if !ok {
+		t.Fatalf("expected artifact object, got %#v", artifacts[0])
+	}
+	if gotPath, _ := artifact["path"].(string); gotPath != failurePath {
+		t.Fatalf("expected artifact path %q, got %#v", failurePath, artifact["path"])
+	}
+	if gotKind, _ := artifact["kind"].(string); gotKind != "report" {
+		t.Fatalf("expected artifact kind report, got %#v", artifact["kind"])
+	}
+}
+
+func TestFailRejectsNonOwner(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	threadID := seedClaimedThreadForInboxTests(t, dbPath, "leader", "worker-b", "worker-b")
+
+	stdout, _, exitCode := executeInboxCommand(
+		"--db", dbPath,
+		"--json",
+		"fail",
+		"--agent", "worker-x",
+		"--thread", threadID,
+		"--summary", "Migration failed",
+	)
+	if exitCode != 20 {
+		t.Fatalf("expected exit code 20, got %d with output %s", exitCode, stdout)
+	}
+	assertErrorJSON(t, stdout, "lease_conflict")
+}
+
+func TestFailRejectsOnTerminalThread(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	threadID := seedClaimedThreadForInboxTests(t, dbPath, "leader", "worker-b", "worker-b")
+
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"fail",
+		"--agent", "worker-b",
+		"--thread", threadID,
+		"--summary", "Migration failed",
+	)
+
+	stdout, _, exitCode := executeInboxCommand(
+		"--db", dbPath,
+		"--json",
+		"fail",
+		"--agent", "worker-b",
+		"--thread", threadID,
+		"--summary", "Migration failed",
+	)
+	if exitCode != 30 {
+		t.Fatalf("expected exit code 30, got %d with output %s", exitCode, stdout)
+	}
+	assertErrorJSON(t, stdout, "invalid_state")
+}

packages/inbox-runtime/internal/cli/inbox/fetch.go

@@ -0,0 +1,97 @@
+package inbox
+
+import (
+	"fmt"
+	"strings"
+
+	"ai-workflow-skill/packages/coord-core/protocol"
+	"ai-workflow-skill/packages/coord-core/store"
+
+	"github.com/spf13/cobra"
+)
+
+type fetchOptions struct {
+	agent    string
+	statuses string
+	limit    int
+	unread   bool
+}
+
+func newFetchCmd(root *rootOptions) *cobra.Command {
+	opts := &fetchOptions{}
+
+	cmd := &cobra.Command{
+		Use:   "fetch",
+		Short: "List candidate threads for an agent",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			ctx := cmd.Context()
+
+			agent := opts.agent
+			if agent == "" {
+				agent = root.agent
+			}
+
+			sqlDB, err := openInboxDB(ctx, root.dbPath)
+			if err != nil {
+				return err
+			}
+			defer sqlDB.Close()
+
+			s := store.NewInboxStore(sqlDB)
+			threads, err := s.FetchThreads(ctx, store.FetchInput{
+				Agent:    agent,
+				Statuses: parseCSV(opts.statuses),
+				Limit:    opts.limit,
+				Unread:   opts.unread,
+			})
+			if err != nil {
+				return err
+			}
+			if len(threads) == 0 {
+				return protocol.NoMatchingWork("no matching work")
+			}
+
+			resp := protocol.Success{
+				OK:      true,
+				Command: "fetch",
+				Data: map[string]any{
+					"threads": threads,
+				},
+			}
+
+			if root.json {
+				return protocol.WriteJSON(cmd.OutOrStdout(), resp)
+			}
+
+			for _, thread := range threads {
+				if _, err := fmt.Fprintf(cmd.OutOrStdout(), "%s\t%s\t%s\n", thread.ThreadID, thread.Status, thread.Subject); err != nil {
+					return err
+				}
+			}
+			return nil
+		},
+	}
+
+	cmd.Flags().StringVar(&opts.agent, "agent", "", "Assigned agent filter")
+	cmd.Flags().StringVar(&opts.statuses, "status", "pending", "Comma-separated status filter")
+	cmd.Flags().IntVar(&opts.limit, "limit", 20, "Maximum number of threads")
+	cmd.Flags().BoolVar(&opts.unread, "unread", false, "Only return threads whose latest message is unread by the agent")
+
+	return cmd
+}
+
+func parseCSV(value string) []string {
+	if strings.TrimSpace(value) == "" {
+		return nil
+	}
+
+	raw := strings.Split(value, ",")
+	out := make([]string, 0, len(raw))
+	for _, entry := range raw {
+		entry = strings.TrimSpace(entry)
+		if entry != "" {
+			out = append(out, entry)
+		}
+	}
+	return out
+}

packages/inbox-runtime/internal/cli/inbox/fetch_integration_test.go

@@ -0,0 +1,187 @@
+package inbox
+
+import "testing"
+
+func TestFetchReturnsPendingThreadForTargetAgent(t *testing.T) {
+	t.Parallel()
+
+	dbPath := initCommandTestDB(t)
+	sendPendingThread(t, dbPath, "leader", "worker-a", "Implement task", "Create API endpoint")
+
+	fetchOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"fetch",
+		"--agent", "worker-a",
+		"--status", "pending",
+	)
+
+	var fetchResp map[string]any
+	mustDecodeJSON(t, fetchOut, &fetchResp)
+	threads, ok := nestedValue(t, fetchResp, "data", "threads").([]any)
+	if !ok || len(threads) < 1 {
+		t.Fatalf("expected at least one fetched thread, got %#v", nestedValue(t, fetchResp, "data", "threads"))
+	}
+	thread, ok := threads[0].(map[string]any)
+	if !ok {
+		t.Fatalf("expected thread object, got %#v", threads[0])
+	}
+	if got, _ := thread["assigned_to"].(string); got != "worker-a" {
+		t.Fatalf("expected assigned_to worker-a, got %#v", thread["assigned_to"])
+	}
+	if got, _ := thread["status"].(string); got != "pending" {
+		t.Fatalf("expected pending status, got %#v", thread["status"])
+	}
+}
+
+func TestFetchRespectsStatusAndLimitFilters(t *testing.T) {
+	t.Parallel()
+
+	dbPath := initCommandTestDB(t)
+	sendPendingThread(t, dbPath, "leader", "worker-a", "Task A", "Pending task")
+	blockedThreadID := sendPendingThread(t, dbPath, "leader", "worker-a", "Task B", "Blocked task")
+
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"claim",
+		"--agent", "worker-a",
+		"--thread", blockedThreadID,
+	)
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"update",
+		"--agent", "worker-a",
+		"--thread", blockedThreadID,
+		"--status", "blocked",
+		"--summary", "Need decision",
+		"--payload-json", `{"question":"continue?"}`,
+	)
+
+	fetchOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"fetch",
+		"--agent", "worker-a",
+		"--status", "pending,blocked",
+		"--limit", "1",
+	)
+
+	var fetchResp map[string]any
+	mustDecodeJSON(t, fetchOut, &fetchResp)
+	threads, ok := nestedValue(t, fetchResp, "data", "threads").([]any)
+	if !ok {
+		t.Fatalf("expected threads array, got %#v", nestedValue(t, fetchResp, "data", "threads"))
+	}
+	if len(threads) > 1 {
+		t.Fatalf("expected at most one thread with limit=1, got %d", len(threads))
+	}
+	if len(threads) == 0 {
+		t.Fatalf("expected one thread with status filter, got empty result")
+	}
+	thread, ok := threads[0].(map[string]any)
+	if !ok {
+		t.Fatalf("expected thread object, got %#v", threads[0])
+	}
+	status, _ := thread["status"].(string)
+	if status != "pending" && status != "blocked" {
+		t.Fatalf("expected pending or blocked status, got %#v", thread["status"])
+	}
+}
+
+func TestFetchUnreadUsesReadCursor(t *testing.T) {
+	t.Parallel()
+
+	dbPath := initCommandTestDB(t)
+	threadID := sendPendingThread(t, dbPath, "leader", "worker-e", "Review navbar copy", "Check top nav wording")
+
+	firstFetchOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"fetch",
+		"--agent", "worker-e",
+		"--status", "pending",
+		"--unread",
+	)
+
+	var firstFetchResp map[string]any
+	mustDecodeJSON(t, firstFetchOut, &firstFetchResp)
+	firstThreads, ok := nestedValue(t, firstFetchResp, "data", "threads").([]any)
+	if !ok || len(firstThreads) != 1 {
+		t.Fatalf("expected one unread thread before mark-read, got %#v", nestedValue(t, firstFetchResp, "data", "threads"))
+	}
+
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--agent", "worker-e",
+		"--json",
+		"show",
+		"--thread", threadID,
+		"--mark-read",
+	)
+
+	stdout, _, exitCode := executeInboxCommand(
+		"--db", dbPath,
+		"--json",
+		"fetch",
+		"--agent", "worker-e",
+		"--status", "pending",
+		"--unread",
+	)
+	if exitCode != 10 {
+		t.Fatalf("expected unread fetch to return no_matching_work after mark-read, got exit=%d stdout=%s", exitCode, stdout)
+	}
+	assertErrorJSON(t, stdout, "no_matching_work")
+
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", "leader",
+		"--to", "worker-e",
+		"--thread", threadID,
+		"--summary", "Use sentence case",
+		"--body", "Keep the nav labels in sentence case.",
+	)
+
+	thirdFetchOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"fetch",
+		"--agent", "worker-e",
+		"--status", "pending",
+		"--unread",
+	)
+	var thirdFetchResp map[string]any
+	mustDecodeJSON(t, thirdFetchOut, &thirdFetchResp)
+	thirdThreads, ok := nestedValue(t, thirdFetchResp, "data", "threads").([]any)
+	if !ok || len(thirdThreads) != 1 {
+		t.Fatalf("expected unread thread to reappear after new message, got %#v", nestedValue(t, thirdFetchResp, "data", "threads"))
+	}
+}
+
+func TestFetchReturnsNoMatchingWorkWhenEmpty(t *testing.T) {
+	t.Parallel()
+
+	dbPath := initCommandTestDB(t)
+	stdout, _, exitCode := executeInboxCommand(
+		"--db", dbPath,
+		"--json",
+		"fetch",
+		"--agent", "worker-z",
+		"--status", "pending",
+	)
+	if exitCode != 10 {
+		t.Fatalf("expected exit code 10, got %d", exitCode)
+	}
+	assertErrorJSON(t, stdout, "no_matching_work")
+}

packages/inbox-runtime/internal/cli/inbox/init.go

@@ -0,0 +1,41 @@
+package inbox
+
+import (
+	"fmt"
+
+	"ai-workflow-skill/packages/coord-core/protocol"
+
+	"github.com/spf13/cobra"
+)
+
+func newInitCmd(opts *rootOptions) *cobra.Command {
+	return &cobra.Command{
+		Use:   "init",
+		Short: "Initialize the shared SQLite database schema",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			ctx := cmd.Context()
+
+			sqlDB, err := openInboxDB(ctx, opts.dbPath)
+			if err != nil {
+				return err
+			}
+			defer sqlDB.Close()
+
+			resp := protocol.Success{
+				OK:      true,
+				Command: "init",
+				Data: map[string]any{
+					"db_path": opts.dbPath,
+					"status":  "initialized",
+				},
+			}
+
+			if opts.json {
+				return protocol.WriteJSON(cmd.OutOrStdout(), resp)
+			}
+
+			_, err = fmt.Fprintf(cmd.OutOrStdout(), "initialized database: %s\n", opts.dbPath)
+			return err
+		},
+	}
+}

packages/inbox-runtime/internal/cli/inbox/init_integration_test.go

@@ -0,0 +1,83 @@
+package inbox
+
+import (
+	"path/filepath"
+	"testing"
+)
+
+func TestInitCreatesSchemaOnEmptyDB(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	initOut := runInboxCommand(t, "--db", dbPath, "--json", "init")
+
+	var initResp map[string]any
+	mustDecodeJSON(t, initOut, &initResp)
+
+	if ok, _ := initResp["ok"].(bool); !ok {
+		t.Fatalf("expected ok=true, got %#v", initResp)
+	}
+	if cmd, _ := initResp["command"].(string); cmd != "init" {
+		t.Fatalf("expected command init, got %#v", initResp["command"])
+	}
+	if got := nestedString(t, initResp, "data", "db_path"); got != dbPath {
+		t.Fatalf("expected db_path %q, got %q", dbPath, got)
+	}
+	if got := nestedString(t, initResp, "data", "status"); got != "initialized" {
+		t.Fatalf("expected initialized status, got %q", got)
+	}
+}
+
+func TestInitIsIdempotentOnExistingDB(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+
+	firstOut := runInboxCommand(t, "--db", dbPath, "--json", "init")
+	secondOut := runInboxCommand(t, "--db", dbPath, "--json", "init")
+
+	var firstResp map[string]any
+	var secondResp map[string]any
+	mustDecodeJSON(t, firstOut, &firstResp)
+	mustDecodeJSON(t, secondOut, &secondResp)
+
+	if got := nestedString(t, firstResp, "data", "status"); got != "initialized" {
+		t.Fatalf("expected first init status initialized, got %q", got)
+	}
+	if got := nestedString(t, secondResp, "data", "status"); got != "initialized" {
+		t.Fatalf("expected second init status initialized, got %q", got)
+	}
+	if got := nestedString(t, firstResp, "data", "db_path"); got != dbPath {
+		t.Fatalf("expected first db_path %q, got %q", dbPath, got)
+	}
+	if got := nestedString(t, secondResp, "data", "db_path"); got != dbPath {
+		t.Fatalf("expected second db_path %q, got %q", dbPath, got)
+	}
+}
+
+func initCommandTestDB(t *testing.T) string {
+	t.Helper()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	runInboxCommand(t, "--db", dbPath, "--json", "init")
+	return dbPath
+}
+
+func sendPendingThread(t *testing.T, dbPath, from, to, subject, summary string) string {
+	t.Helper()
+
+	sendOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", from,
+		"--to", to,
+		"--subject", subject,
+		"--summary", summary,
+	)
+
+	var sendResp map[string]any
+	mustDecodeJSON(t, sendOut, &sendResp)
+	return nestedString(t, sendResp, "data", "thread", "thread_id")
+}

packages/inbox-runtime/internal/cli/inbox/integration_test.go

@@ -0,0 +1,734 @@
+package inbox
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+)
+
+func TestInboxLifecycle(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+
+	initOut := runInboxCommand(t, "--db", dbPath, "--json", "init")
+	var initResp map[string]any
+	mustDecodeJSON(t, initOut, &initResp)
+	if initResp["ok"] != true {
+		t.Fatalf("expected init ok=true, got %#v", initResp)
+	}
+
+	sendOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", "leader",
+		"--to", "worker-a",
+		"--subject", "Implement feature X",
+		"--summary", "Add retry policy",
+		"--body", "Implement retry handling for the HTTP client.",
+		"--run", "run_blog_001",
+		"--task", "T1",
+	)
+
+	var sendResp map[string]any
+	mustDecodeJSON(t, sendOut, &sendResp)
+	threadID := nestedString(t, sendResp, "data", "thread", "thread_id")
+	threadStatus := nestedString(t, sendResp, "data", "thread", "status")
+	if threadStatus != "pending" {
+		t.Fatalf("expected pending thread, got %q", threadStatus)
+	}
+
+	fetchOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"fetch",
+		"--agent", "worker-a",
+		"--status", "pending",
+	)
+
+	var fetchResp map[string]any
+	mustDecodeJSON(t, fetchOut, &fetchResp)
+	threadsValue := nestedValue(t, fetchResp, "data", "threads")
+	threads, ok := threadsValue.([]any)
+	if !ok || len(threads) != 1 {
+		t.Fatalf("expected one fetched thread, got %#v", threadsValue)
+	}
+
+	claimOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"claim",
+		"--agent", "worker-a",
+		"--thread", threadID,
+		"--lease-seconds", "300",
+	)
+
+	var claimResp map[string]any
+	mustDecodeJSON(t, claimOut, &claimResp)
+	claimedStatus := nestedString(t, claimResp, "data", "thread", "status")
+	if claimedStatus != "claimed" {
+		t.Fatalf("expected claimed thread, got %q", claimedStatus)
+	}
+
+	updateOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"update",
+		"--agent", "worker-a",
+		"--thread", threadID,
+		"--status", "in_progress",
+		"--summary", "Implementation started",
+		"--body", "Scanning current HTTP client usage.",
+	)
+
+	var updateResp map[string]any
+	mustDecodeJSON(t, updateOut, &updateResp)
+	updatedStatus := nestedString(t, updateResp, "data", "thread", "status")
+	if updatedStatus != "in_progress" {
+		t.Fatalf("expected in_progress thread, got %q", updatedStatus)
+	}
+
+	blockedOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"update",
+		"--agent", "worker-a",
+		"--thread", threadID,
+		"--status", "blocked",
+		"--summary", "Need timeout decision",
+		"--payload-json", `{"question":"Should retries apply to read timeouts?"}`,
+	)
+
+	var blockedResp map[string]any
+	mustDecodeJSON(t, blockedOut, &blockedResp)
+	blockedStatus := nestedString(t, blockedResp, "data", "thread", "status")
+	if blockedStatus != "blocked" {
+		t.Fatalf("expected blocked thread, got %q", blockedStatus)
+	}
+
+	replyOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"reply",
+		"--from", "leader",
+		"--to", "worker-a",
+		"--thread", threadID,
+		"--summary", "Retry read timeouts",
+		"--body", "Yes, include read timeouts in the retry policy.",
+	)
+
+	var replyResp map[string]any
+	mustDecodeJSON(t, replyOut, &replyResp)
+	replyKind := nestedString(t, replyResp, "data", "message", "kind")
+	if replyKind != "answer" {
+		t.Fatalf("expected answer reply, got %q", replyKind)
+	}
+
+	doneOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"done",
+		"--agent", "worker-a",
+		"--thread", threadID,
+		"--summary", "Retry policy implemented",
+		"--body", "The HTTP client now retries the selected transient failures.",
+	)
+
+	var doneResp map[string]any
+	mustDecodeJSON(t, doneOut, &doneResp)
+	doneStatus := nestedString(t, doneResp, "data", "thread", "status")
+	if doneStatus != "done" {
+		t.Fatalf("expected done thread, got %q", doneStatus)
+	}
+
+	showOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"show",
+		"--thread", threadID,
+	)
+
+	var showResp map[string]any
+	mustDecodeJSON(t, showOut, &showResp)
+	showStatus := nestedString(t, showResp, "data", "thread", "status")
+	if showStatus != "done" {
+		t.Fatalf("expected show status done, got %q", showStatus)
+	}
+	messagesValue := nestedValue(t, showResp, "data", "messages")
+	messages, ok := messagesValue.([]any)
+	if !ok || len(messages) != 6 {
+		t.Fatalf("expected six messages in thread history, got %#v", messagesValue)
+	}
+}
+
+func TestInboxFailLifecycle(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+
+	runInboxCommand(t, "--db", dbPath, "--json", "init")
+
+	sendOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", "leader",
+		"--to", "worker-b",
+		"--subject", "Investigate failing migration",
+		"--summary", "Check migration failure",
+		"--run", "run_blog_002",
+		"--task", "T2",
+	)
+
+	var sendResp map[string]any
+	mustDecodeJSON(t, sendOut, &sendResp)
+	threadID := nestedString(t, sendResp, "data", "thread", "thread_id")
+
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"claim",
+		"--agent", "worker-b",
+		"--thread", threadID,
+	)
+
+	failOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"fail",
+		"--agent", "worker-b",
+		"--thread", threadID,
+		"--summary", "Migration failed",
+		"--body", "The migration cannot proceed because the prior schema is inconsistent.",
+	)
+
+	var failResp map[string]any
+	mustDecodeJSON(t, failOut, &failResp)
+	failStatus := nestedString(t, failResp, "data", "thread", "status")
+	if failStatus != "failed" {
+		t.Fatalf("expected failed thread, got %q", failStatus)
+	}
+
+	showOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"show",
+		"--thread", threadID,
+	)
+
+	var showResp map[string]any
+	mustDecodeJSON(t, showOut, &showResp)
+	showStatus := nestedString(t, showResp, "data", "thread", "status")
+	if showStatus != "failed" {
+		t.Fatalf("expected show status failed, got %q", showStatus)
+	}
+}
+
+func TestInboxRenewWaitReplyAndCancel(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+
+	runInboxCommand(t, "--db", dbPath, "--json", "init")
+
+	sendOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", "leader",
+		"--to", "worker-c",
+		"--subject", "Investigate auth edge case",
+		"--summary", "Check auth redirect behavior",
+		"--run", "run_blog_003",
+		"--task", "T3",
+	)
+
+	var sendResp map[string]any
+	mustDecodeJSON(t, sendOut, &sendResp)
+	threadID := nestedString(t, sendResp, "data", "thread", "thread_id")
+
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"claim",
+		"--agent", "worker-c",
+		"--thread", threadID,
+		"--lease-seconds", "300",
+	)
+
+	renewOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"renew",
+		"--agent", "worker-c",
+		"--thread", threadID,
+		"--lease-seconds", "600",
+	)
+
+	var renewResp map[string]any
+	mustDecodeJSON(t, renewOut, &renewResp)
+	if got := nestedString(t, renewResp, "data", "message", "summary"); got != "lease renewed" {
+		t.Fatalf("expected lease renewed summary, got %q", got)
+	}
+
+	blockedOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"update",
+		"--agent", "worker-c",
+		"--thread", threadID,
+		"--status", "blocked",
+		"--summary", "Need policy decision",
+		"--body", "Should guest users be redirected to login or shown a 403 page?",
+	)
+
+	var blockedResp map[string]any
+	mustDecodeJSON(t, blockedOut, &blockedResp)
+	blockedMessageID := nestedString(t, blockedResp, "data", "message", "message_id")
+
+	type commandResult struct {
+		stdout string
+		stderr string
+		exit   int
+	}
+
+	waitCh := make(chan commandResult, 1)
+	go func() {
+		stdout, stderr, exitCode := executeInboxCommand(
+			"--db", dbPath,
+			"--agent", "worker-c",
+			"--json",
+			"wait-reply",
+			"--thread", threadID,
+			"--after-message", blockedMessageID,
+			"--timeout-seconds", "2",
+		)
+		waitCh <- commandResult{stdout: stdout, stderr: stderr, exit: exitCode}
+	}()
+
+	time.Sleep(200 * time.Millisecond)
+
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"reply",
+		"--from", "leader",
+		"--to", "worker-c",
+		"--thread", threadID,
+		"--summary", "Redirect to login",
+		"--body", "Redirect guests to login for the MVP.",
+	)
+
+	var waitResult commandResult
+	select {
+	case waitResult = <-waitCh:
+	case <-time.After(3 * time.Second):
+		t.Fatal("wait-reply command did not return")
+	}
+
+	if waitResult.exit != 0 {
+		t.Fatalf("wait-reply failed with exit=%d\nstderr:\n%s\nstdout:\n%s", waitResult.exit, waitResult.stderr, waitResult.stdout)
+	}
+
+	var waitResp map[string]any
+	mustDecodeJSON(t, waitResult.stdout, &waitResp)
+	if woke, ok := nestedValue(t, waitResp, "data", "woke").(bool); !ok || !woke {
+		t.Fatalf("expected wait-reply to wake, got %#v", nestedValue(t, waitResp, "data", "woke"))
+	}
+	if kind := nestedString(t, waitResp, "data", "message", "kind"); kind != "answer" {
+		t.Fatalf("expected answer wake message, got %q", kind)
+	}
+
+	stdout, _, exitCode := executeInboxCommand(
+		"--db", dbPath,
+		"--agent", "worker-c",
+		"--json",
+		"fetch",
+		"--status", "blocked",
+		"--unread",
+	)
+	if exitCode != 10 {
+		t.Fatalf("expected blocked unread list to be cleared after wait-reply, got exit %d with %s", exitCode, stdout)
+	}
+
+	cancelOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"cancel",
+		"--agent", "leader",
+		"--thread", threadID,
+		"--reason", "Task superseded by a larger refactor",
+	)
+
+	var cancelResp map[string]any
+	mustDecodeJSON(t, cancelOut, &cancelResp)
+	if status := nestedString(t, cancelResp, "data", "thread", "status"); status != "cancelled" {
+		t.Fatalf("expected cancelled thread, got %q", status)
+	}
+}
+
+func TestInboxWatchListUnreadAndAppend(t *testing.T) {
+	t.Parallel()
+
+	tempDir := t.TempDir()
+	dbPath := filepath.Join(tempDir, "coord.db")
+	bodyPath := filepath.Join(tempDir, "task.md")
+
+	if err := os.WriteFile(bodyPath, []byte("Implement the initial admin post editor."), 0o644); err != nil {
+		t.Fatalf("write body file: %v", err)
+	}
+
+	runInboxCommand(t, "--db", dbPath, "--json", "init")
+
+	type commandResult struct {
+		stdout string
+		stderr string
+		exit   int
+	}
+
+	watchCh := make(chan commandResult, 1)
+	go func() {
+		stdout, stderr, exitCode := executeInboxCommand(
+			"--db", dbPath,
+			"--json",
+			"watch",
+			"--agent", "worker-d",
+			"--status", "pending",
+			"--timeout-seconds", "2",
+		)
+		watchCh <- commandResult{stdout: stdout, stderr: stderr, exit: exitCode}
+	}()
+
+	time.Sleep(200 * time.Millisecond)
+
+	sendOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", "leader",
+		"--to", "worker-d",
+		"--subject", "Build admin editor",
+		"--summary", "Create the first editor screen",
+		"--body-file", bodyPath,
+		"--artifact", bodyPath,
+		"--artifact-kind", "brief",
+		"--artifact-metadata-json", `{"label":"task-brief"}`,
+		"--run", "run_blog_004",
+		"--task", "T4",
+	)
+
+	var sendResp map[string]any
+	mustDecodeJSON(t, sendOut, &sendResp)
+	threadID := nestedString(t, sendResp, "data", "thread", "thread_id")
+
+	var watchResult commandResult
+	select {
+	case watchResult = <-watchCh:
+	case <-time.After(3 * time.Second):
+		t.Fatal("watch command did not return")
+	}
+
+	if watchResult.exit != 0 {
+		t.Fatalf("watch failed with exit=%d\nstderr:\n%s\nstdout:\n%s", watchResult.exit, watchResult.stderr, watchResult.stdout)
+	}
+
+	var watchResp map[string]any
+	mustDecodeJSON(t, watchResult.stdout, &watchResp)
+	if woke, ok := nestedValue(t, watchResp, "data", "woke").(bool); !ok || !woke {
+		t.Fatalf("expected watch to wake, got %#v", nestedValue(t, watchResp, "data", "woke"))
+	}
+	if watchedThreadID := nestedString(t, watchResp, "data", "thread", "thread_id"); watchedThreadID != threadID {
+		t.Fatalf("expected watch on thread %s, got %s", threadID, watchedThreadID)
+	}
+
+	fetchOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"fetch",
+		"--agent", "worker-d",
+		"--status", "pending",
+		"--unread",
+	)
+
+	var fetchResp map[string]any
+	mustDecodeJSON(t, fetchOut, &fetchResp)
+	fetchedThreads, ok := nestedValue(t, fetchResp, "data", "threads").([]any)
+	if !ok || len(fetchedThreads) != 1 {
+		t.Fatalf("expected one unread pending thread, got %#v", nestedValue(t, fetchResp, "data", "threads"))
+	}
+
+	listOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"list",
+		"--assigned-to", "worker-d",
+		"--status", "pending",
+	)
+
+	var listResp map[string]any
+	mustDecodeJSON(t, listOut, &listResp)
+	listedThreads, ok := nestedValue(t, listResp, "data", "threads").([]any)
+	if !ok || len(listedThreads) != 1 {
+		t.Fatalf("expected one listed thread, got %#v", nestedValue(t, listResp, "data", "threads"))
+	}
+
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", "leader",
+		"--to", "worker-d",
+		"--thread", threadID,
+		"--summary", "Use a markdown editor",
+		"--body", "Prefer a textarea-based markdown editor for v1.",
+	)
+
+	showOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"show",
+		"--thread", threadID,
+	)
+
+	var showResp map[string]any
+	mustDecodeJSON(t, showOut, &showResp)
+	messages, ok := nestedValue(t, showResp, "data", "messages").([]any)
+	if !ok || len(messages) != 2 {
+		t.Fatalf("expected two messages after append, got %#v", nestedValue(t, showResp, "data", "messages"))
+	}
+	firstMessage, ok := messages[0].(map[string]any)
+	if !ok {
+		t.Fatalf("expected first message object, got %#v", messages[0])
+	}
+	if firstMessage["body"] != "Implement the initial admin post editor." {
+		t.Fatalf("expected body-file content in first message, got %#v", firstMessage["body"])
+	}
+	artifacts, ok := firstMessage["artifacts"].([]any)
+	if !ok || len(artifacts) != 1 {
+		t.Fatalf("expected one artifact on first message, got %#v", firstMessage["artifacts"])
+	}
+	firstArtifact, ok := artifacts[0].(map[string]any)
+	if !ok {
+		t.Fatalf("expected artifact object, got %#v", artifacts[0])
+	}
+	if firstArtifact["path"] != bodyPath {
+		t.Fatalf("expected artifact path %q, got %#v", bodyPath, firstArtifact["path"])
+	}
+	if firstArtifact["kind"] != "brief" {
+		t.Fatalf("expected artifact kind brief, got %#v", firstArtifact["kind"])
+	}
+}
+
+func TestInboxUnreadReadCursor(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+
+	runInboxCommand(t, "--db", dbPath, "--json", "init")
+
+	sendOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", "leader",
+		"--to", "worker-e",
+		"--subject", "Review navbar copy",
+		"--summary", "Check top nav wording",
+	)
+
+	var sendResp map[string]any
+	mustDecodeJSON(t, sendOut, &sendResp)
+	threadID := nestedString(t, sendResp, "data", "thread", "thread_id")
+
+	fetchOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"fetch",
+		"--agent", "worker-e",
+		"--status", "pending",
+		"--unread",
+	)
+
+	var fetchResp map[string]any
+	mustDecodeJSON(t, fetchOut, &fetchResp)
+	threads, ok := nestedValue(t, fetchResp, "data", "threads").([]any)
+	if !ok || len(threads) != 1 {
+		t.Fatalf("expected one unread pending thread, got %#v", nestedValue(t, fetchResp, "data", "threads"))
+	}
+
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--agent", "worker-e",
+		"--json",
+		"show",
+		"--thread", threadID,
+		"--mark-read",
+	)
+
+	stdout, _, exitCode := executeInboxCommand(
+		"--db", dbPath,
+		"--json",
+		"fetch",
+		"--agent", "worker-e",
+		"--status", "pending",
+		"--unread",
+	)
+	if exitCode != 10 {
+		t.Fatalf("expected unread fetch to clear after mark-read, got exit %d with %s", exitCode, stdout)
+	}
+
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", "leader",
+		"--to", "worker-e",
+		"--thread", threadID,
+		"--summary", "Use sentence case",
+		"--body", "Keep the nav labels in sentence case.",
+	)
+
+	fetchOut = runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"fetch",
+		"--agent", "worker-e",
+		"--status", "pending",
+		"--unread",
+	)
+
+	mustDecodeJSON(t, fetchOut, &fetchResp)
+	threads, ok = nestedValue(t, fetchResp, "data", "threads").([]any)
+	if !ok || len(threads) != 1 {
+		t.Fatalf("expected unread thread to reappear after new message, got %#v", nestedValue(t, fetchResp, "data", "threads"))
+	}
+}
+
+func TestInboxJSONErrorsAndExitCodes(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+
+	if _, _, exitCode := executeInboxCommand("--db", dbPath, "--json", "init"); exitCode != 0 {
+		t.Fatalf("expected init exit code 0, got %d", exitCode)
+	}
+
+	stdout, _, exitCode := executeInboxCommand(
+		"--db", dbPath,
+		"--json",
+		"fetch",
+		"--agent", "worker-z",
+		"--status", "pending",
+	)
+	if exitCode != 10 {
+		t.Fatalf("expected fetch no-match exit code 10, got %d", exitCode)
+	}
+	assertErrorJSON(t, stdout, "no_matching_work")
+
+	stdout, _, exitCode = executeInboxCommand(
+		"--db", dbPath,
+		"--json",
+		"claim",
+		"--agent", "worker-z",
+		"--thread", "thr_missing",
+	)
+	if exitCode != 40 {
+		t.Fatalf("expected claim missing-thread exit code 40, got %d", exitCode)
+	}
+	assertErrorJSON(t, stdout, "not_found")
+
+	sendOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", "leader",
+		"--to", "worker-z",
+		"--subject", "Review cache settings",
+		"--summary", "Check cache config",
+	)
+
+	var sendResp map[string]any
+	mustDecodeJSON(t, sendOut, &sendResp)
+	threadID := nestedString(t, sendResp, "data", "thread", "thread_id")
+
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"claim",
+		"--agent", "worker-z",
+		"--thread", threadID,
+	)
+
+	stdout, _, exitCode = executeInboxCommand(
+		"--db", dbPath,
+		"--json",
+		"claim",
+		"--agent", "worker-y",
+		"--thread", threadID,
+	)
+	if exitCode != 20 {
+		t.Fatalf("expected lease conflict exit code 20, got %d", exitCode)
+	}
+	assertErrorJSON(t, stdout, "lease_conflict")
+
+	stdout, _, exitCode = executeInboxCommand(
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", "leader",
+		"--to", "worker-z",
+		"--subject", "Invalid payload json",
+		"--payload-json", "not-json",
+	)
+	if exitCode != 30 {
+		t.Fatalf("expected invalid input exit code 30, got %d", exitCode)
+	}
+	assertErrorJSON(t, stdout, "invalid_input")
+
+	stdout, _, exitCode = executeInboxCommand(
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", "leader",
+		"--to", "worker-z",
+		"--subject", "Invalid artifact json",
+		"--artifact", "/tmp/report.md",
+		"--artifact-metadata-json", "not-json",
+	)
+	if exitCode != 30 {
+		t.Fatalf("expected invalid artifact metadata exit code 30, got %d", exitCode)
+	}
+	assertErrorJSON(t, stdout, "invalid_input")
+}

packages/inbox-runtime/internal/cli/inbox/list.go

@@ -0,0 +1,83 @@
+package inbox
+
+import (
+	"fmt"
+
+	"ai-workflow-skill/packages/coord-core/protocol"
+	"ai-workflow-skill/packages/coord-core/store"
+
+	"github.com/spf13/cobra"
+)
+
+type listOptions struct {
+	agent      string
+	statuses   string
+	createdBy  string
+	assignedTo string
+	limit      int
+}
+
+func newListCmd(root *rootOptions) *cobra.Command {
+	opts := &listOptions{}
+
+	cmd := &cobra.Command{
+		Use:   "list",
+		Short: "List threads with filters",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			ctx := cmd.Context()
+
+			agent := opts.agent
+			if agent == "" {
+				agent = root.agent
+			}
+
+			sqlDB, err := openInboxDB(ctx, root.dbPath)
+			if err != nil {
+				return err
+			}
+			defer sqlDB.Close()
+
+			s := store.NewInboxStore(sqlDB)
+			threads, err := s.ListThreads(ctx, store.ListInput{
+				Agent:      agent,
+				Statuses:   parseCSV(opts.statuses),
+				CreatedBy:  opts.createdBy,
+				AssignedTo: opts.assignedTo,
+				Limit:      opts.limit,
+			})
+			if err != nil {
+				return err
+			}
+			if len(threads) == 0 {
+				return protocol.NoMatchingWork("no matching work")
+			}
+
+			resp := protocol.Success{
+				OK:      true,
+				Command: "list",
+				Data: map[string]any{
+					"threads": threads,
+				},
+			}
+
+			if root.json {
+				return protocol.WriteJSON(cmd.OutOrStdout(), resp)
+			}
+
+			for _, thread := range threads {
+				if _, err := fmt.Fprintf(cmd.OutOrStdout(), "%s\t%s\t%s\t%s\n", thread.ThreadID, thread.Status, thread.AssignedTo, thread.Subject); err != nil {
+					return err
+				}
+			}
+			return nil
+		},
+	}
+
+	cmd.Flags().StringVar(&opts.agent, "agent", "", "Assigned agent filter shortcut")
+	cmd.Flags().StringVar(&opts.statuses, "status", "", "Comma-separated status filter")
+	cmd.Flags().StringVar(&opts.createdBy, "created-by", "", "Created-by filter")
+	cmd.Flags().StringVar(&opts.assignedTo, "assigned-to", "", "Assigned-to filter")
+	cmd.Flags().IntVar(&opts.limit, "limit", 20, "Maximum number of threads")
+
+	return cmd
+}

packages/inbox-runtime/internal/cli/inbox/list_integration_test.go

@@ -0,0 +1,183 @@
+package inbox
+
+import (
+	"path/filepath"
+	"testing"
+	"time"
+)
+
+func TestListFiltersByStatus(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	runInboxCommand(t, "--db", dbPath, "--json", "init")
+
+	createThreadForList(t, dbPath, "leader", "worker-d", "Task pending", "Pending task")
+	blockedThreadID := createThreadForList(t, dbPath, "leader", "worker-d", "Task blocked", "Blocked task")
+	runInboxCommand(t, "--db", dbPath, "--json", "claim", "--agent", "worker-d", "--thread", blockedThreadID)
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"update",
+		"--agent", "worker-d",
+		"--thread", blockedThreadID,
+		"--status", "blocked",
+		"--summary", "Need policy decision",
+	)
+
+	listOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"list",
+		"--agent", "worker-d",
+		"--status", "pending,blocked",
+	)
+
+	var listResp map[string]any
+	mustDecodeJSON(t, listOut, &listResp)
+	threads, ok := nestedValue(t, listResp, "data", "threads").([]any)
+	if !ok || len(threads) < 2 {
+		t.Fatalf("expected at least two matching threads, got %#v", nestedValue(t, listResp, "data", "threads"))
+	}
+	for _, raw := range threads {
+		thread, ok := raw.(map[string]any)
+		if !ok {
+			t.Fatalf("expected thread object, got %#v", raw)
+		}
+		status, _ := thread["status"].(string)
+		if status != "pending" && status != "blocked" {
+			t.Fatalf("expected status pending or blocked, got %#v", status)
+		}
+	}
+}
+
+func TestListFiltersByCreatedBy(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	runInboxCommand(t, "--db", dbPath, "--json", "init")
+
+	createThreadForList(t, dbPath, "leader", "worker-d", "Leader task", "From leader")
+	createThreadForList(t, dbPath, "planner", "worker-d", "Planner task", "From planner")
+
+	listOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"list",
+		"--created-by", "leader",
+		"--assigned-to", "worker-d",
+	)
+
+	var listResp map[string]any
+	mustDecodeJSON(t, listOut, &listResp)
+	threads, ok := nestedValue(t, listResp, "data", "threads").([]any)
+	if !ok || len(threads) == 0 {
+		t.Fatalf("expected matching leader-created threads, got %#v", nestedValue(t, listResp, "data", "threads"))
+	}
+	for _, raw := range threads {
+		thread, ok := raw.(map[string]any)
+		if !ok {
+			t.Fatalf("expected thread object, got %#v", raw)
+		}
+		if got := thread["created_by"]; got != "leader" {
+			t.Fatalf("expected created_by leader, got %#v", got)
+		}
+	}
+}
+
+func TestListFiltersByAssignedTo(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	runInboxCommand(t, "--db", dbPath, "--json", "init")
+
+	createThreadForList(t, dbPath, "leader", "worker-d", "Worker D task", "For worker-d")
+	createThreadForList(t, dbPath, "leader", "worker-e", "Worker E task", "For worker-e")
+
+	listOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"list",
+		"--assigned-to", "worker-d",
+		"--status", "pending",
+	)
+
+	var listResp map[string]any
+	mustDecodeJSON(t, listOut, &listResp)
+	threads, ok := nestedValue(t, listResp, "data", "threads").([]any)
+	if !ok || len(threads) == 0 {
+		t.Fatalf("expected assigned-to match, got %#v", nestedValue(t, listResp, "data", "threads"))
+	}
+	for _, raw := range threads {
+		thread, ok := raw.(map[string]any)
+		if !ok {
+			t.Fatalf("expected thread object, got %#v", raw)
+		}
+		if got := thread["assigned_to"]; got != "worker-d" {
+			t.Fatalf("expected assigned_to worker-d, got %#v", got)
+		}
+		if got := thread["status"]; got != "pending" {
+			t.Fatalf("expected pending status, got %#v", got)
+		}
+	}
+}
+
+func TestListRespectsLimit(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	runInboxCommand(t, "--db", dbPath, "--json", "init")
+
+	createThreadForList(t, dbPath, "leader", "worker-d", "Task 1", "Earlier task")
+	time.Sleep(20 * time.Millisecond)
+	createThreadForList(t, dbPath, "leader", "worker-d", "Task 2", "Latest task")
+
+	listOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"list",
+		"--assigned-to", "worker-d",
+		"--limit", "1",
+	)
+
+	var listResp map[string]any
+	mustDecodeJSON(t, listOut, &listResp)
+	threads, ok := nestedValue(t, listResp, "data", "threads").([]any)
+	if !ok {
+		t.Fatalf("expected threads array, got %#v", nestedValue(t, listResp, "data", "threads"))
+	}
+	if len(threads) != 1 {
+		t.Fatalf("expected exactly one row for limit=1, got %d", len(threads))
+	}
+	thread, ok := threads[0].(map[string]any)
+	if !ok {
+		t.Fatalf("expected thread object, got %#v", threads[0])
+	}
+	if got := thread["subject"]; got != "Task 2" {
+		t.Fatalf("expected latest thread subject Task 2, got %#v", got)
+	}
+}
+
+func createThreadForList(t *testing.T, dbPath, from, to, subject, summary string) string {
+	t.Helper()
+
+	sendOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", from,
+		"--to", to,
+		"--subject", subject,
+		"--summary", summary,
+	)
+	var sendResp map[string]any
+	mustDecodeJSON(t, sendOut, &sendResp)
+	return nestedString(t, sendResp, "data", "thread", "thread_id")
+}
+

packages/inbox-runtime/internal/cli/inbox/renew.go

@@ -0,0 +1,76 @@
+package inbox
+
+import (
+	"fmt"
+
+	"ai-workflow-skill/packages/coord-core/protocol"
+	"ai-workflow-skill/packages/coord-core/store"
+
+	"github.com/spf13/cobra"
+)
+
+type renewOptions struct {
+	agent        string
+	threadID     string
+	leaseSeconds int
+}
+
+func newRenewCmd(root *rootOptions) *cobra.Command {
+	opts := &renewOptions{}
+
+	cmd := &cobra.Command{
+		Use:   "renew",
+		Short: "Extend an existing lease",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			ctx := cmd.Context()
+
+			agent := opts.agent
+			if agent == "" {
+				agent = root.agent
+			}
+			if agent == "" {
+				return protocol.InvalidInput("agent is required", nil)
+			}
+
+			sqlDB, err := openInboxDB(ctx, root.dbPath)
+			if err != nil {
+				return err
+			}
+			defer sqlDB.Close()
+
+			s := store.NewInboxStore(sqlDB)
+			result, err := s.RenewLease(ctx, store.RenewInput{
+				ThreadID:     opts.threadID,
+				Agent:        agent,
+				LeaseSeconds: opts.leaseSeconds,
+			})
+			if err != nil {
+				return err
+			}
+
+			resp := protocol.Success{
+				OK:      true,
+				Command: "renew",
+				Data: map[string]any{
+					"thread":  result.Thread,
+					"message": result.Message,
+				},
+			}
+
+			if root.json {
+				return protocol.WriteJSON(cmd.OutOrStdout(), resp)
+			}
+
+			_, err = fmt.Fprintf(cmd.OutOrStdout(), "renewed lease on thread %s\n", result.Thread.ThreadID)
+			return err
+		},
+	}
+
+	cmd.Flags().StringVar(&opts.agent, "agent", "", "Lease owner")
+	cmd.Flags().StringVar(&opts.threadID, "thread", "", "Thread ID")
+	cmd.Flags().IntVar(&opts.leaseSeconds, "lease-seconds", 900, "Lease duration in seconds")
+
+	_ = cmd.MarkFlagRequired("thread")
+
+	return cmd
+}

packages/inbox-runtime/internal/cli/inbox/renew_integration_test.go

@@ -0,0 +1,103 @@
+package inbox
+
+import "testing"
+
+func TestRenewExtendsActiveLease(t *testing.T) {
+	t.Parallel()
+
+	dbPath := initCommandTestDB(t)
+	threadID := sendPendingThread(t, dbPath, "leader", "worker-c", "Renew lease", "Need renew coverage")
+
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"claim",
+		"--agent", "worker-c",
+		"--thread", threadID,
+		"--lease-seconds", "300",
+	)
+
+	renewOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"renew",
+		"--agent", "worker-c",
+		"--thread", threadID,
+		"--lease-seconds", "600",
+	)
+
+	var renewResp map[string]any
+	mustDecodeJSON(t, renewOut, &renewResp)
+	if got := nestedString(t, renewResp, "data", "thread", "status"); got != "claimed" {
+		t.Fatalf("expected status to stay claimed, got %q", got)
+	}
+	if got := nestedString(t, renewResp, "data", "message", "kind"); got != "event" {
+		t.Fatalf("expected event message kind, got %q", got)
+	}
+	if got := nestedString(t, renewResp, "data", "message", "summary"); got != "lease renewed" {
+		t.Fatalf("expected lease renewed summary, got %q", got)
+	}
+	payload, ok := nestedValue(t, renewResp, "data", "message", "payload_json").(map[string]any)
+	if !ok {
+		t.Fatalf("expected payload_json object, got %#v", nestedValue(t, renewResp, "data", "message", "payload_json"))
+	}
+	leaseSeconds, ok := payload["lease_seconds"].(float64)
+	if !ok || int(leaseSeconds) != 600 {
+		t.Fatalf("expected lease_seconds 600, got %#v", payload["lease_seconds"])
+	}
+	leaseToken, _ := payload["lease_token"].(string)
+	if leaseToken == "" {
+		t.Fatalf("expected non-empty lease_token, got %#v", payload["lease_token"])
+	}
+}
+
+func TestRenewRejectsNonOwner(t *testing.T) {
+	t.Parallel()
+
+	dbPath := initCommandTestDB(t)
+	threadID := sendPendingThread(t, dbPath, "leader", "worker-c", "Renew non-owner", "Reject non-owner renew")
+
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"claim",
+		"--agent", "worker-c",
+		"--thread", threadID,
+	)
+
+	stdout, _, exitCode := executeInboxCommand(
+		"--db", dbPath,
+		"--json",
+		"renew",
+		"--agent", "worker-x",
+		"--thread", threadID,
+		"--lease-seconds", "600",
+	)
+	if exitCode != 20 {
+		t.Fatalf("expected exit code 20, got %d", exitCode)
+	}
+	assertErrorJSON(t, stdout, "lease_conflict")
+}
+
+func TestRenewRejectsWithoutActiveLease(t *testing.T) {
+	t.Parallel()
+
+	dbPath := initCommandTestDB(t)
+	threadID := sendPendingThread(t, dbPath, "leader", "worker-c", "Renew without lease", "Should fail without active lease")
+
+	stdout, _, exitCode := executeInboxCommand(
+		"--db", dbPath,
+		"--json",
+		"renew",
+		"--agent", "worker-c",
+		"--thread", threadID,
+		"--lease-seconds", "600",
+	)
+	if exitCode != 30 {
+		t.Fatalf("expected exit code 30, got %d", exitCode)
+	}
+	assertErrorJSON(t, stdout, "invalid_state")
+}

packages/inbox-runtime/internal/cli/inbox/reply.go

@@ -0,0 +1,104 @@
+package inbox
+
+import (
+	"fmt"
+
+	"ai-workflow-skill/packages/coord-core/protocol"
+	"ai-workflow-skill/packages/coord-core/store"
+
+	"github.com/spf13/cobra"
+)
+
+type replyOptions struct {
+	from        string
+	to          string
+	threadID    string
+	kind        string
+	summary     string
+	body        string
+	bodyFile    string
+	payloadJSON string
+	artifacts   artifactOptions
+}
+
+func newReplyCmd(root *rootOptions) *cobra.Command {
+	opts := &replyOptions{}
+
+	cmd := &cobra.Command{
+		Use:   "reply",
+		Short: "Reply inside an existing thread",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			ctx := cmd.Context()
+
+			from := opts.from
+			if from == "" {
+				from = root.agent
+			}
+			if from == "" {
+				return protocol.InvalidInput("from agent is required", nil)
+			}
+
+			body, err := resolveBodyValue(opts.body, opts.bodyFile)
+			if err != nil {
+				return err
+			}
+			artifacts, err := resolveArtifacts(opts.artifacts)
+			if err != nil {
+				return err
+			}
+
+			sqlDB, err := openInboxDB(ctx, root.dbPath)
+			if err != nil {
+				return err
+			}
+			defer sqlDB.Close()
+
+			s := store.NewInboxStore(sqlDB)
+			thread, message, err := s.ReplyToThread(ctx, store.ReplyInput{
+				ThreadID:    opts.threadID,
+				FromAgent:   from,
+				ToAgent:     opts.to,
+				Kind:        opts.kind,
+				Summary:     opts.summary,
+				Body:        body,
+				PayloadJSON: opts.payloadJSON,
+				Artifacts:   artifacts,
+			})
+			if err != nil {
+				return err
+			}
+
+			resp := protocol.Success{
+				OK:      true,
+				Command: "reply",
+				Data: map[string]any{
+					"thread":  thread,
+					"message": message,
+				},
+			}
+
+			if root.json {
+				return protocol.WriteJSON(cmd.OutOrStdout(), resp)
+			}
+
+			_, err = fmt.Fprintf(cmd.OutOrStdout(), "replied on thread %s\n", thread.ThreadID)
+			return err
+		},
+	}
+
+	cmd.Flags().StringVar(&opts.from, "from", "", "Replying agent")
+	cmd.Flags().StringVar(&opts.to, "to", "", "Receiving agent")
+	cmd.Flags().StringVar(&opts.threadID, "thread", "", "Thread ID")
+	cmd.Flags().StringVar(&opts.kind, "kind", "answer", "Reply kind")
+	cmd.Flags().StringVar(&opts.summary, "summary", "", "Short reply summary")
+	cmd.Flags().StringVar(&opts.body, "body", "", "Reply body")
+	cmd.Flags().StringVar(&opts.bodyFile, "body-file", "", "Read reply body from file")
+	cmd.Flags().StringVar(&opts.payloadJSON, "payload-json", "", "Structured payload JSON string")
+	addArtifactFlags(cmd, &opts.artifacts)
+
+	_ = cmd.MarkFlagRequired("thread")
+	_ = cmd.MarkFlagRequired("to")
+	_ = cmd.MarkFlagRequired("summary")
+
+	return cmd
+}

packages/inbox-runtime/internal/cli/inbox/reply_integration_test.go

@@ -0,0 +1,138 @@
+package inbox
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestReplyAddsAnswerMessage(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	threadID := seedThreadForInboxTests(t, dbPath, "leader", "worker-a")
+
+	replyOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"reply",
+		"--from", "leader",
+		"--to", "worker-a",
+		"--thread", threadID,
+		"--summary", "Retry read timeouts",
+		"--body", "Yes, include read timeouts in the retry policy.",
+	)
+
+	var replyResp map[string]any
+	mustDecodeJSON(t, replyOut, &replyResp)
+	if kind := nestedString(t, replyResp, "data", "message", "kind"); kind != "answer" {
+		t.Fatalf("expected answer message kind, got %q", kind)
+	}
+	if gotThreadID := nestedString(t, replyResp, "data", "thread", "thread_id"); gotThreadID != threadID {
+		t.Fatalf("expected thread_id %q, got %q", threadID, gotThreadID)
+	}
+	if status := nestedString(t, replyResp, "data", "thread", "status"); status != "pending" {
+		t.Fatalf("expected thread status pending, got %q", status)
+	}
+}
+
+func TestReplySupportsControlKind(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	threadID := seedThreadForInboxTests(t, dbPath, "leader", "worker-a")
+
+	replyOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"reply",
+		"--from", "leader",
+		"--to", "worker-a",
+		"--thread", threadID,
+		"--kind", "control",
+		"--summary", "Pause rollout",
+		"--body", "Pause rollout until QA confirms the fix.",
+	)
+
+	var replyResp map[string]any
+	mustDecodeJSON(t, replyOut, &replyResp)
+	if kind := nestedString(t, replyResp, "data", "message", "kind"); kind != "control" {
+		t.Fatalf("expected control message kind, got %q", kind)
+	}
+}
+
+func TestReplyAttachesArtifact(t *testing.T) {
+	t.Parallel()
+
+	tempDir := t.TempDir()
+	dbPath := filepath.Join(tempDir, "coord.db")
+	decisionPath := filepath.Join(tempDir, "decision.md")
+	if err := os.WriteFile(decisionPath, []byte("Decision note."), 0o644); err != nil {
+		t.Fatalf("write decision file: %v", err)
+	}
+
+	threadID := seedThreadForInboxTests(t, dbPath, "leader", "worker-a")
+
+	replyOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"reply",
+		"--from", "leader",
+		"--to", "worker-a",
+		"--thread", threadID,
+		"--summary", "Retry read timeouts",
+		"--artifact", decisionPath,
+		"--artifact-kind", "brief",
+		"--artifact-metadata-json", `{"label":"decision"}`,
+	)
+
+	var replyResp map[string]any
+	mustDecodeJSON(t, replyOut, &replyResp)
+	artifactsValue := nestedValue(t, replyResp, "data", "message", "artifacts")
+	artifacts, ok := artifactsValue.([]any)
+	if !ok || len(artifacts) != 1 {
+		t.Fatalf("expected one artifact, got %#v", artifactsValue)
+	}
+	artifact, ok := artifacts[0].(map[string]any)
+	if !ok {
+		t.Fatalf("expected artifact object, got %#v", artifacts[0])
+	}
+	if gotPath, _ := artifact["path"].(string); gotPath != decisionPath {
+		t.Fatalf("expected artifact path %q, got %#v", decisionPath, artifact["path"])
+	}
+	if gotKind, _ := artifact["kind"].(string); gotKind != "brief" {
+		t.Fatalf("expected artifact kind brief, got %#v", artifact["kind"])
+	}
+	metadata, ok := artifact["metadata_json"].(map[string]any)
+	if !ok {
+		t.Fatalf("expected metadata_json object, got %#v", artifact["metadata_json"])
+	}
+	if gotLabel := metadata["label"]; gotLabel != "decision" {
+		t.Fatalf("expected metadata label decision, got %#v", gotLabel)
+	}
+}
+
+func TestReplyRejectsInvalidPayloadJSON(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	threadID := seedThreadForInboxTests(t, dbPath, "leader", "worker-a")
+
+	stdout, _, exitCode := executeInboxCommand(
+		"--db", dbPath,
+		"--json",
+		"reply",
+		"--from", "leader",
+		"--to", "worker-a",
+		"--thread", threadID,
+		"--summary", "Retry read timeouts",
+		"--payload-json", "not-json",
+	)
+	if exitCode != 30 {
+		t.Fatalf("expected exit code 30, got %d with output %s", exitCode, stdout)
+	}
+	assertErrorJSON(t, stdout, "invalid_input")
+}

packages/inbox-runtime/internal/cli/inbox/root.go

@@ -0,0 +1,43 @@
+package inbox
+
+import (
+	"github.com/spf13/cobra"
+)
+
+type rootOptions struct {
+	dbPath string
+	json   bool
+	agent  string
+}
+
+func NewRootCmd() *cobra.Command {
+	opts := &rootOptions{}
+
+	cmd := &cobra.Command{
+		Use:           "inbox",
+		Short:         "Worker-facing durable coordination bus",
+		SilenceErrors: true,
+		SilenceUsage:  true,
+	}
+
+	cmd.PersistentFlags().StringVar(&opts.dbPath, "db", ".agents/coord.db", "SQLite database path")
+	cmd.PersistentFlags().BoolVar(&opts.json, "json", false, "Emit machine-readable JSON")
+	cmd.PersistentFlags().StringVar(&opts.agent, "agent", "", "Agent identity")
+
+	cmd.AddCommand(newInitCmd(opts))
+	cmd.AddCommand(newSendCmd(opts))
+	cmd.AddCommand(newFetchCmd(opts))
+	cmd.AddCommand(newClaimCmd(opts))
+	cmd.AddCommand(newRenewCmd(opts))
+	cmd.AddCommand(newUpdateCmd(opts))
+	cmd.AddCommand(newReplyCmd(opts))
+	cmd.AddCommand(newDoneCmd(opts))
+	cmd.AddCommand(newFailCmd(opts))
+	cmd.AddCommand(newCancelCmd(opts))
+	cmd.AddCommand(newListCmd(opts))
+	cmd.AddCommand(newWatchCmd(opts))
+	cmd.AddCommand(newWaitReplyCmd(opts))
+	cmd.AddCommand(newShowCmd(opts))
+
+	return cmd
+}

packages/inbox-runtime/internal/cli/inbox/send.go

@@ -0,0 +1,117 @@
+package inbox
+
+import (
+	"fmt"
+
+	"ai-workflow-skill/packages/coord-core/protocol"
+	"ai-workflow-skill/packages/coord-core/store"
+
+	"github.com/spf13/cobra"
+)
+
+type sendOptions struct {
+	from        string
+	to          string
+	threadID    string
+	runID       string
+	taskID      string
+	subject     string
+	kind        string
+	summary     string
+	body        string
+	bodyFile    string
+	payloadJSON string
+	priority    string
+	artifacts   artifactOptions
+}
+
+func newSendCmd(root *rootOptions) *cobra.Command {
+	opts := &sendOptions{}
+
+	cmd := &cobra.Command{
+		Use:   "send",
+		Short: "Create a thread with an initial directed message",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			ctx := cmd.Context()
+
+			from := opts.from
+			if from == "" {
+				from = root.agent
+			}
+			if from == "" {
+				return protocol.InvalidInput("from agent is required", nil)
+			}
+			if opts.threadID == "" && opts.subject == "" {
+				return protocol.InvalidInput("subject is required when creating a new thread", nil)
+			}
+
+			body, err := resolveBodyValue(opts.body, opts.bodyFile)
+			if err != nil {
+				return err
+			}
+			artifacts, err := resolveArtifacts(opts.artifacts)
+			if err != nil {
+				return err
+			}
+
+			sqlDB, err := openInboxDB(ctx, root.dbPath)
+			if err != nil {
+				return err
+			}
+			defer sqlDB.Close()
+
+			s := store.NewInboxStore(sqlDB)
+			thread, message, err := s.Send(ctx, store.SendInput{
+				ThreadID:    opts.threadID,
+				RunID:       opts.runID,
+				TaskID:      opts.taskID,
+				Subject:     opts.subject,
+				FromAgent:   from,
+				ToAgent:     opts.to,
+				Kind:        opts.kind,
+				Summary:     opts.summary,
+				Body:        body,
+				PayloadJSON: opts.payloadJSON,
+				Priority:    opts.priority,
+				Artifacts:   artifacts,
+			})
+			if err != nil {
+				return err
+			}
+
+			resp := protocol.Success{
+				OK:      true,
+				Command: "send",
+				Data: map[string]any{
+					"thread":  thread,
+					"message": message,
+				},
+			}
+
+			if root.json {
+				return protocol.WriteJSON(cmd.OutOrStdout(), resp)
+			}
+
+			_, err = fmt.Fprintf(cmd.OutOrStdout(), "created thread %s\n", thread.ThreadID)
+			return err
+		},
+	}
+
+	cmd.Flags().StringVar(&opts.from, "from", "", "Sending agent")
+	cmd.Flags().StringVar(&opts.to, "to", "", "Receiving agent")
+	cmd.Flags().StringVar(&opts.threadID, "thread", "", "Optional thread ID override")
+	cmd.Flags().StringVar(&opts.runID, "run", "", "Optional run ID override")
+	cmd.Flags().StringVar(&opts.taskID, "task", "", "Optional task ID override")
+	cmd.Flags().StringVar(&opts.subject, "subject", "", "Thread subject")
+	cmd.Flags().StringVar(&opts.kind, "kind", "task", "Initial message kind")
+	cmd.Flags().StringVar(&opts.summary, "summary", "", "Short message summary")
+	cmd.Flags().StringVar(&opts.body, "body", "", "Message body")
+	cmd.Flags().StringVar(&opts.bodyFile, "body-file", "", "Read message body from file")
+	cmd.Flags().StringVar(&opts.payloadJSON, "payload-json", "", "Structured payload JSON string")
+	cmd.Flags().StringVar(&opts.priority, "priority", "normal", "Thread priority")
+	addArtifactFlags(cmd, &opts.artifacts)
+
+	_ = cmd.MarkFlagRequired("to")
+
+	return cmd
+}

packages/inbox-runtime/internal/cli/inbox/send_integration_test.go

@@ -0,0 +1,230 @@
+package inbox
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestSendCreatesNewThread(t *testing.T) {
+	t.Parallel()
+
+	dbPath := initCommandTestDB(t)
+
+	sendOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", "leader",
+		"--to", "worker-a",
+		"--subject", "Implement feature X",
+		"--summary", "Add retry policy",
+		"--body", "Implement retry handling for the HTTP client.",
+		"--run", "run_blog_001",
+		"--task", "T1",
+	)
+
+	var sendResp map[string]any
+	mustDecodeJSON(t, sendOut, &sendResp)
+
+	if got := nestedString(t, sendResp, "data", "thread", "thread_id"); got == "" {
+		t.Fatalf("expected thread_id, got empty")
+	}
+	if got := nestedString(t, sendResp, "data", "thread", "status"); got != "pending" {
+		t.Fatalf("expected pending status, got %q", got)
+	}
+	if got := nestedString(t, sendResp, "data", "thread", "created_by"); got != "leader" {
+		t.Fatalf("expected created_by leader, got %q", got)
+	}
+	if got := nestedString(t, sendResp, "data", "thread", "assigned_to"); got != "worker-a" {
+		t.Fatalf("expected assigned_to worker-a, got %q", got)
+	}
+	if got := nestedString(t, sendResp, "data", "message", "kind"); got != "task" {
+		t.Fatalf("expected message kind task, got %q", got)
+	}
+}
+
+func TestSendAppendsMessageToExistingThread(t *testing.T) {
+	t.Parallel()
+
+	dbPath := initCommandTestDB(t)
+	threadID := sendPendingThread(t, dbPath, "leader", "worker-d", "Build editor", "Create editor v1")
+
+	appendOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", "leader",
+		"--to", "worker-d",
+		"--thread", threadID,
+		"--summary", "Use a markdown editor",
+		"--body", "Prefer a textarea-based markdown editor for v1.",
+	)
+
+	var appendResp map[string]any
+	mustDecodeJSON(t, appendOut, &appendResp)
+	if got := nestedString(t, appendResp, "data", "thread", "thread_id"); got != threadID {
+		t.Fatalf("expected same thread_id %q, got %q", threadID, got)
+	}
+	if got := nestedString(t, appendResp, "data", "thread", "status"); got != "pending" {
+		t.Fatalf("expected thread status to stay pending, got %q", got)
+	}
+
+	showOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"show",
+		"--thread", threadID,
+	)
+
+	var showResp map[string]any
+	mustDecodeJSON(t, showOut, &showResp)
+	messages, ok := nestedValue(t, showResp, "data", "messages").([]any)
+	if !ok || len(messages) != 2 {
+		t.Fatalf("expected two messages after append, got %#v", nestedValue(t, showResp, "data", "messages"))
+	}
+}
+
+func TestSendReadsBodyFromBodyFile(t *testing.T) {
+	t.Parallel()
+
+	tempDir := t.TempDir()
+	dbPath := filepath.Join(tempDir, "coord.db")
+	bodyPath := filepath.Join(tempDir, "task.md")
+	bodyContent := "Create the first editor screen.\nUse markdown syntax."
+	if err := os.WriteFile(bodyPath, []byte(bodyContent), 0o644); err != nil {
+		t.Fatalf("write body file: %v", err)
+	}
+	runInboxCommand(t, "--db", dbPath, "--json", "init")
+
+	sendOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", "leader",
+		"--to", "worker-d",
+		"--subject", "Build admin editor",
+		"--summary", "Create the first editor screen",
+		"--body-file", bodyPath,
+	)
+
+	var sendResp map[string]any
+	mustDecodeJSON(t, sendOut, &sendResp)
+	threadID := nestedString(t, sendResp, "data", "thread", "thread_id")
+
+	showOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"show",
+		"--thread", threadID,
+	)
+
+	var showResp map[string]any
+	mustDecodeJSON(t, showOut, &showResp)
+	messages, ok := nestedValue(t, showResp, "data", "messages").([]any)
+	if !ok || len(messages) != 1 {
+		t.Fatalf("expected one message, got %#v", nestedValue(t, showResp, "data", "messages"))
+	}
+	message, ok := messages[0].(map[string]any)
+	if !ok {
+		t.Fatalf("expected message object, got %#v", messages[0])
+	}
+	if got, _ := message["body"].(string); got != bodyContent {
+		t.Fatalf("expected body %q, got %#v", bodyContent, message["body"])
+	}
+}
+
+func TestSendAttachesArtifactWithMetadata(t *testing.T) {
+	t.Parallel()
+
+	tempDir := t.TempDir()
+	dbPath := filepath.Join(tempDir, "coord.db")
+	artifactPath := filepath.Join(tempDir, "task.md")
+	if err := os.WriteFile(artifactPath, []byte("task brief"), 0o644); err != nil {
+		t.Fatalf("write artifact file: %v", err)
+	}
+	runInboxCommand(t, "--db", dbPath, "--json", "init")
+
+	sendOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", "leader",
+		"--to", "worker-d",
+		"--subject", "Build admin editor",
+		"--summary", "Create the first editor screen",
+		"--artifact", artifactPath,
+		"--artifact-kind", "brief",
+		"--artifact-metadata-json", `{"label":"task-brief"}`,
+	)
+
+	var sendResp map[string]any
+	mustDecodeJSON(t, sendOut, &sendResp)
+
+	artifacts, ok := nestedValue(t, sendResp, "data", "message", "artifacts").([]any)
+	if !ok || len(artifacts) != 1 {
+		t.Fatalf("expected one artifact, got %#v", nestedValue(t, sendResp, "data", "message", "artifacts"))
+	}
+	artifact, ok := artifacts[0].(map[string]any)
+	if !ok {
+		t.Fatalf("expected artifact object, got %#v", artifacts[0])
+	}
+	if got, _ := artifact["path"].(string); got != artifactPath {
+		t.Fatalf("expected artifact path %q, got %#v", artifactPath, artifact["path"])
+	}
+	if got, _ := artifact["kind"].(string); got != "brief" {
+		t.Fatalf("expected artifact kind brief, got %#v", artifact["kind"])
+	}
+	metadata, ok := artifact["metadata_json"].(map[string]any)
+	if !ok {
+		t.Fatalf("expected metadata_json object, got %#v", artifact["metadata_json"])
+	}
+	if got, _ := metadata["label"].(string); got != "task-brief" {
+		t.Fatalf("expected metadata_json.label task-brief, got %#v", metadata["label"])
+	}
+}
+
+func TestSendRejectsInvalidPayloadJSON(t *testing.T) {
+	t.Parallel()
+
+	dbPath := initCommandTestDB(t)
+	stdout, _, exitCode := executeInboxCommand(
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", "leader",
+		"--to", "worker-z",
+		"--subject", "Invalid payload json",
+		"--payload-json", "not-json",
+	)
+	if exitCode != 30 {
+		t.Fatalf("expected exit code 30, got %d", exitCode)
+	}
+	assertErrorJSON(t, stdout, "invalid_input")
+}
+
+func TestSendRejectsInvalidArtifactMetadataJSON(t *testing.T) {
+	t.Parallel()
+
+	dbPath := initCommandTestDB(t)
+	stdout, _, exitCode := executeInboxCommand(
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", "leader",
+		"--to", "worker-z",
+		"--subject", "Invalid artifact json",
+		"--artifact", "/tmp/report.md",
+		"--artifact-metadata-json", "not-json",
+	)
+	if exitCode != 30 {
+		t.Fatalf("expected exit code 30, got %d", exitCode)
+	}
+	assertErrorJSON(t, stdout, "invalid_input")
+}

packages/inbox-runtime/internal/cli/inbox/show.go

@@ -0,0 +1,78 @@
+package inbox
+
+import (
+	"fmt"
+
+	"ai-workflow-skill/packages/coord-core/protocol"
+	"ai-workflow-skill/packages/coord-core/store"
+
+	"github.com/spf13/cobra"
+)
+
+type showOptions struct {
+	threadID string
+	markRead bool
+}
+
+func newShowCmd(root *rootOptions) *cobra.Command {
+	opts := &showOptions{}
+
+	cmd := &cobra.Command{
+		Use:   "show",
+		Short: "Show one thread with message history",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			ctx := cmd.Context()
+
+			sqlDB, err := openInboxDB(ctx, root.dbPath)
+			if err != nil {
+				return err
+			}
+			defer sqlDB.Close()
+
+			s := store.NewInboxStore(sqlDB)
+			agent := root.agent
+			if opts.markRead && agent == "" {
+				return protocol.InvalidInput("agent is required when using --mark-read", nil)
+			}
+
+			detail, err := s.GetThreadForAgent(ctx, opts.threadID, agent, opts.markRead)
+			if err != nil {
+				return err
+			}
+
+			resp := protocol.Success{
+				OK:      true,
+				Command: "show",
+				Data: map[string]any{
+					"thread":   detail.Thread,
+					"messages": detail.Messages,
+				},
+			}
+
+			if root.json {
+				return protocol.WriteJSON(cmd.OutOrStdout(), resp)
+			}
+
+			if _, err := fmt.Fprintf(cmd.OutOrStdout(), "%s\t%s\t%s\n", detail.Thread.ThreadID, detail.Thread.Status, detail.Thread.Subject); err != nil {
+				return err
+			}
+			for _, message := range detail.Messages {
+				if _, err := fmt.Fprintf(cmd.OutOrStdout(), "- %s\t%s\t%s\n", message.MessageID, message.Kind, message.Summary); err != nil {
+					return err
+				}
+				for _, artifact := range message.Artifacts {
+					if _, err := fmt.Fprintf(cmd.OutOrStdout(), "  artifact\t%s\t%s\n", artifact.Kind, artifact.Path); err != nil {
+						return err
+					}
+				}
+			}
+			return nil
+		},
+	}
+
+	cmd.Flags().StringVar(&opts.threadID, "thread", "", "Thread ID")
+	cmd.Flags().BoolVar(&opts.markRead, "mark-read", false, "Advance the caller's read cursor to the latest message")
+	_ = cmd.MarkFlagRequired("thread")
+
+	return cmd
+}

packages/inbox-runtime/internal/cli/inbox/show_integration_test.go

@@ -0,0 +1,196 @@
+package inbox
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestShowReturnsThreadAndMessageHistory(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	runInboxCommand(t, "--db", dbPath, "--json", "init")
+
+	sendOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", "leader",
+		"--to", "worker-a",
+		"--subject", "Implement feature X",
+		"--summary", "Initial request",
+	)
+	var sendResp map[string]any
+	mustDecodeJSON(t, sendOut, &sendResp)
+	threadID := nestedString(t, sendResp, "data", "thread", "thread_id")
+
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", "leader",
+		"--to", "worker-a",
+		"--thread", threadID,
+		"--summary", "Follow-up request",
+		"--body", "Please include request logging.",
+	)
+
+	showOut := runInboxCommand(t, "--db", dbPath, "--json", "show", "--thread", threadID)
+	var showResp map[string]any
+	mustDecodeJSON(t, showOut, &showResp)
+	if got := nestedString(t, showResp, "data", "thread", "thread_id"); got != threadID {
+		t.Fatalf("expected thread %q, got %q", threadID, got)
+	}
+
+	messages, ok := nestedValue(t, showResp, "data", "messages").([]any)
+	if !ok || len(messages) != 2 {
+		t.Fatalf("expected two ordered messages, got %#v", nestedValue(t, showResp, "data", "messages"))
+	}
+	first, ok := messages[0].(map[string]any)
+	if !ok {
+		t.Fatalf("expected first message object, got %#v", messages[0])
+	}
+	second, ok := messages[1].(map[string]any)
+	if !ok {
+		t.Fatalf("expected second message object, got %#v", messages[1])
+	}
+	if got := first["summary"]; got != "Initial request" {
+		t.Fatalf("expected first summary Initial request, got %#v", got)
+	}
+	if got := second["summary"]; got != "Follow-up request" {
+		t.Fatalf("expected second summary Follow-up request, got %#v", got)
+	}
+}
+
+func TestShowIncludesArtifactsPerMessage(t *testing.T) {
+	t.Parallel()
+
+	tempDir := t.TempDir()
+	dbPath := filepath.Join(tempDir, "coord.db")
+	artifactPath := filepath.Join(tempDir, "task.md")
+	if err := os.WriteFile(artifactPath, []byte("task brief"), 0o644); err != nil {
+		t.Fatalf("write artifact file: %v", err)
+	}
+
+	runInboxCommand(t, "--db", dbPath, "--json", "init")
+
+	sendOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", "leader",
+		"--to", "worker-a",
+		"--subject", "Artifact task",
+		"--summary", "Attach brief",
+		"--artifact", artifactPath,
+		"--artifact-kind", "brief",
+		"--artifact-metadata-json", `{"label":"task-brief"}`,
+	)
+	var sendResp map[string]any
+	mustDecodeJSON(t, sendOut, &sendResp)
+	threadID := nestedString(t, sendResp, "data", "thread", "thread_id")
+
+	showOut := runInboxCommand(t, "--db", dbPath, "--json", "show", "--thread", threadID)
+	var showResp map[string]any
+	mustDecodeJSON(t, showOut, &showResp)
+
+	messages, ok := nestedValue(t, showResp, "data", "messages").([]any)
+	if !ok || len(messages) == 0 {
+		t.Fatalf("expected messages with artifacts, got %#v", nestedValue(t, showResp, "data", "messages"))
+	}
+	first, ok := messages[0].(map[string]any)
+	if !ok {
+		t.Fatalf("expected message object, got %#v", messages[0])
+	}
+	artifacts, ok := first["artifacts"].([]any)
+	if !ok || len(artifacts) != 1 {
+		t.Fatalf("expected one artifact, got %#v", first["artifacts"])
+	}
+	artifact, ok := artifacts[0].(map[string]any)
+	if !ok {
+		t.Fatalf("expected artifact object, got %#v", artifacts[0])
+	}
+	if got := artifact["path"]; got != artifactPath {
+		t.Fatalf("expected artifact path %q, got %#v", artifactPath, got)
+	}
+	if got := artifact["kind"]; got != "brief" {
+		t.Fatalf("expected artifact kind brief, got %#v", got)
+	}
+}
+
+func TestShowMarkReadAdvancesReadCursor(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	runInboxCommand(t, "--db", dbPath, "--json", "init")
+
+	sendOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", "leader",
+		"--to", "worker-e",
+		"--subject", "Review nav copy",
+		"--summary", "Check wording",
+	)
+	var sendResp map[string]any
+	mustDecodeJSON(t, sendOut, &sendResp)
+	threadID := nestedString(t, sendResp, "data", "thread", "thread_id")
+
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"fetch",
+		"--agent", "worker-e",
+		"--status", "pending",
+		"--unread",
+	)
+
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--agent", "worker-e",
+		"--json",
+		"show",
+		"--thread", threadID,
+		"--mark-read",
+	)
+
+	stdout, _, exitCode := executeInboxCommand(
+		"--db", dbPath,
+		"--json",
+		"fetch",
+		"--agent", "worker-e",
+		"--status", "pending",
+		"--unread",
+	)
+	if exitCode != 10 {
+		t.Fatalf("expected unread fetch to be empty after mark-read, got exit=%d with %s", exitCode, stdout)
+	}
+	assertErrorJSON(t, stdout, "no_matching_work")
+}
+
+func TestShowRejectsWhenThreadMissing(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	runInboxCommand(t, "--db", dbPath, "--json", "init")
+
+	stdout, _, exitCode := executeInboxCommand(
+		"--db", dbPath,
+		"--json",
+		"show",
+		"--thread", "thr_missing",
+	)
+	if exitCode != 40 {
+		t.Fatalf("expected not-found exit code 40, got %d with %s", exitCode, stdout)
+	}
+	assertErrorJSON(t, stdout, "not_found")
+}
+

packages/inbox-runtime/internal/cli/inbox/test_helpers_test.go

@@ -0,0 +1,78 @@
+package inbox
+
+import (
+	"bytes"
+	"encoding/json"
+	"testing"
+)
+
+func runInboxCommand(t *testing.T, args ...string) string {
+	t.Helper()
+
+	stdout, stderr, exitCode := executeInboxCommand(args...)
+	if exitCode != 0 {
+		t.Fatalf("execute inbox command %v: exit=%d\nstderr:\n%s\nstdout:\n%s", args, exitCode, stderr, stdout)
+	}
+
+	return stdout
+}
+
+func executeInboxCommand(args ...string) (string, string, int) {
+	var stdout bytes.Buffer
+	var stderr bytes.Buffer
+	exitCode := Execute(args, &stdout, &stderr)
+	return stdout.String(), stderr.String(), exitCode
+}
+
+func mustDecodeJSON(t *testing.T, raw string, target any) {
+	t.Helper()
+
+	if err := json.Unmarshal([]byte(raw), target); err != nil {
+		t.Fatalf("decode json %q: %v", raw, err)
+	}
+}
+
+func nestedString(t *testing.T, value map[string]any, keys ...string) string {
+	t.Helper()
+
+	current := nestedValue(t, value, keys...)
+	str, ok := current.(string)
+	if !ok {
+		t.Fatalf("expected string at %v, got %#v", keys, current)
+	}
+	return str
+}
+
+func nestedValue(t *testing.T, value map[string]any, keys ...string) any {
+	t.Helper()
+
+	var current any = value
+	for _, key := range keys {
+		obj, ok := current.(map[string]any)
+		if !ok {
+			t.Fatalf("expected object at %q in %v, got %#v", key, keys, current)
+		}
+		current, ok = obj[key]
+		if !ok {
+			t.Fatalf("missing key %q in %v", key, keys)
+		}
+	}
+	return current
+}
+
+func assertErrorJSON(t *testing.T, raw string, expectedCode string) {
+	t.Helper()
+
+	var payload map[string]any
+	mustDecodeJSON(t, raw, &payload)
+	if ok, _ := payload["ok"].(bool); ok {
+		t.Fatalf("expected ok=false error payload, got %#v", payload)
+	}
+	errorValue, ok := payload["error"].(map[string]any)
+	if !ok {
+		t.Fatalf("expected error object, got %#v", payload["error"])
+	}
+	if code, _ := errorValue["code"].(string); code != expectedCode {
+		t.Fatalf("expected error code %q, got %#v", expectedCode, errorValue["code"])
+	}
+}

packages/inbox-runtime/internal/cli/inbox/update.go

@@ -0,0 +1,101 @@
+package inbox
+
+import (
+	"fmt"
+
+	"ai-workflow-skill/packages/coord-core/protocol"
+	"ai-workflow-skill/packages/coord-core/store"
+
+	"github.com/spf13/cobra"
+)
+
+type updateOptions struct {
+	agent       string
+	threadID    string
+	status      string
+	summary     string
+	body        string
+	bodyFile    string
+	payloadJSON string
+	artifacts   artifactOptions
+}
+
+func newUpdateCmd(root *rootOptions) *cobra.Command {
+	opts := &updateOptions{}
+
+	cmd := &cobra.Command{
+		Use:   "update",
+		Short: "Append a progress or blocked update to a thread",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			ctx := cmd.Context()
+
+			agent := opts.agent
+			if agent == "" {
+				agent = root.agent
+			}
+			if agent == "" {
+				return protocol.InvalidInput("agent is required", nil)
+			}
+
+			body, err := resolveBodyValue(opts.body, opts.bodyFile)
+			if err != nil {
+				return err
+			}
+			artifacts, err := resolveArtifacts(opts.artifacts)
+			if err != nil {
+				return err
+			}
+
+			sqlDB, err := openInboxDB(ctx, root.dbPath)
+			if err != nil {
+				return err
+			}
+			defer sqlDB.Close()
+
+			s := store.NewInboxStore(sqlDB)
+			thread, message, err := s.UpdateThreadStatus(ctx, store.UpdateInput{
+				ThreadID:    opts.threadID,
+				Agent:       agent,
+				Status:      opts.status,
+				Summary:     opts.summary,
+				Body:        body,
+				PayloadJSON: opts.payloadJSON,
+				Artifacts:   artifacts,
+			})
+			if err != nil {
+				return err
+			}
+
+			resp := protocol.Success{
+				OK:      true,
+				Command: "update",
+				Data: map[string]any{
+					"thread":  thread,
+					"message": message,
+				},
+			}
+
+			if root.json {
+				return protocol.WriteJSON(cmd.OutOrStdout(), resp)
+			}
+
+			_, err = fmt.Fprintf(cmd.OutOrStdout(), "updated thread %s to %s\n", thread.ThreadID, thread.Status)
+			return err
+		},
+	}
+
+	cmd.Flags().StringVar(&opts.agent, "agent", "", "Updating agent")
+	cmd.Flags().StringVar(&opts.threadID, "thread", "", "Thread ID")
+	cmd.Flags().StringVar(&opts.status, "status", "", "New status: in_progress or blocked")
+	cmd.Flags().StringVar(&opts.summary, "summary", "", "Short update summary")
+	cmd.Flags().StringVar(&opts.body, "body", "", "Update body")
+	cmd.Flags().StringVar(&opts.bodyFile, "body-file", "", "Read update body from file")
+	cmd.Flags().StringVar(&opts.payloadJSON, "payload-json", "", "Structured payload JSON string")
+	addArtifactFlags(cmd, &opts.artifacts)
+
+	_ = cmd.MarkFlagRequired("thread")
+	_ = cmd.MarkFlagRequired("status")
+	_ = cmd.MarkFlagRequired("summary")
+
+	return cmd
+}

packages/inbox-runtime/internal/cli/inbox/update_integration_test.go

@@ -0,0 +1,226 @@
+package inbox
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func seedThreadForInboxTests(t *testing.T, dbPath, from, to string) string {
+	t.Helper()
+
+	runInboxCommand(t, "--db", dbPath, "--json", "init")
+
+	sendOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", from,
+		"--to", to,
+		"--subject", "Implement feature X",
+		"--summary", "Add retry policy",
+	)
+
+	var sendResp map[string]any
+	mustDecodeJSON(t, sendOut, &sendResp)
+	return nestedString(t, sendResp, "data", "thread", "thread_id")
+}
+
+func seedClaimedThreadForInboxTests(t *testing.T, dbPath, from, to, claimer string) string {
+	t.Helper()
+
+	threadID := seedThreadForInboxTests(t, dbPath, from, to)
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"claim",
+		"--agent", claimer,
+		"--thread", threadID,
+		"--lease-seconds", "300",
+	)
+	return threadID
+}
+
+func lastThreadMessageFromShow(t *testing.T, showResp map[string]any) map[string]any {
+	t.Helper()
+
+	messagesValue := nestedValue(t, showResp, "data", "messages")
+	messages, ok := messagesValue.([]any)
+	if !ok || len(messages) == 0 {
+		t.Fatalf("expected non-empty messages, got %#v", messagesValue)
+	}
+
+	lastMessage, ok := messages[len(messages)-1].(map[string]any)
+	if !ok {
+		t.Fatalf("expected message object, got %#v", messages[len(messages)-1])
+	}
+	return lastMessage
+}
+
+func TestUpdateMovesThreadToInProgress(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	threadID := seedClaimedThreadForInboxTests(t, dbPath, "leader", "worker-a", "worker-a")
+
+	updateOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"update",
+		"--agent", "worker-a",
+		"--thread", threadID,
+		"--status", "in_progress",
+		"--summary", "Implementation started",
+		"--body", "Scanning current HTTP client usage.",
+	)
+
+	var updateResp map[string]any
+	mustDecodeJSON(t, updateOut, &updateResp)
+	if status := nestedString(t, updateResp, "data", "thread", "status"); status != "in_progress" {
+		t.Fatalf("expected in_progress thread status, got %q", status)
+	}
+	if kind := nestedString(t, updateResp, "data", "message", "kind"); kind != "progress" {
+		t.Fatalf("expected progress message kind, got %q", kind)
+	}
+	if toAgent := nestedString(t, updateResp, "data", "message", "to_agent"); toAgent != "leader" {
+		t.Fatalf("expected message to_agent leader, got %q", toAgent)
+	}
+}
+
+func TestUpdateMovesThreadToBlockedWithPayload(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	threadID := seedClaimedThreadForInboxTests(t, dbPath, "leader", "worker-a", "worker-a")
+
+	updateOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"update",
+		"--agent", "worker-a",
+		"--thread", threadID,
+		"--status", "blocked",
+		"--summary", "Need timeout decision",
+		"--payload-json", `{"question":"Should retries apply to read timeouts?"}`,
+	)
+
+	var updateResp map[string]any
+	mustDecodeJSON(t, updateOut, &updateResp)
+	if status := nestedString(t, updateResp, "data", "thread", "status"); status != "blocked" {
+		t.Fatalf("expected blocked thread status, got %q", status)
+	}
+	if kind := nestedString(t, updateResp, "data", "message", "kind"); kind != "question" {
+		t.Fatalf("expected question message kind, got %q", kind)
+	}
+	payload, ok := nestedValue(t, updateResp, "data", "message", "payload_json").(map[string]any)
+	if !ok {
+		t.Fatalf("expected payload_json object, got %#v", nestedValue(t, updateResp, "data", "message", "payload_json"))
+	}
+	if got := payload["question"]; got != "Should retries apply to read timeouts?" {
+		t.Fatalf("expected payload question, got %#v", got)
+	}
+}
+
+func TestUpdateAcceptsBodyFileAndArtifact(t *testing.T) {
+	t.Parallel()
+
+	tempDir := t.TempDir()
+	dbPath := filepath.Join(tempDir, "coord.db")
+	progressPath := filepath.Join(tempDir, "progress.md")
+	body := "Progress update from file."
+	if err := os.WriteFile(progressPath, []byte(body), 0o644); err != nil {
+		t.Fatalf("write progress file: %v", err)
+	}
+
+	threadID := seedClaimedThreadForInboxTests(t, dbPath, "leader", "worker-a", "worker-a")
+
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"update",
+		"--agent", "worker-a",
+		"--thread", threadID,
+		"--status", "in_progress",
+		"--summary", "Implementation started",
+		"--body-file", progressPath,
+		"--artifact", progressPath,
+		"--artifact-kind", "note",
+	)
+
+	showOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"show",
+		"--thread", threadID,
+	)
+	var showResp map[string]any
+	mustDecodeJSON(t, showOut, &showResp)
+	lastMessage := lastThreadMessageFromShow(t, showResp)
+
+	if gotBody, _ := lastMessage["body"].(string); gotBody != body {
+		t.Fatalf("expected body %q, got %#v", body, lastMessage["body"])
+	}
+	artifacts, ok := lastMessage["artifacts"].([]any)
+	if !ok || len(artifacts) != 1 {
+		t.Fatalf("expected one artifact, got %#v", lastMessage["artifacts"])
+	}
+	artifact, ok := artifacts[0].(map[string]any)
+	if !ok {
+		t.Fatalf("expected artifact object, got %#v", artifacts[0])
+	}
+	if gotPath, _ := artifact["path"].(string); gotPath != progressPath {
+		t.Fatalf("expected artifact path %q, got %#v", progressPath, artifact["path"])
+	}
+	if gotKind, _ := artifact["kind"].(string); gotKind != "note" {
+		t.Fatalf("expected artifact kind note, got %#v", artifact["kind"])
+	}
+}
+
+func TestUpdateRejectsInvalidPayloadJSON(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	threadID := seedClaimedThreadForInboxTests(t, dbPath, "leader", "worker-a", "worker-a")
+
+	stdout, _, exitCode := executeInboxCommand(
+		"--db", dbPath,
+		"--json",
+		"update",
+		"--agent", "worker-a",
+		"--thread", threadID,
+		"--status", "blocked",
+		"--summary", "Need timeout decision",
+		"--payload-json", "not-json",
+	)
+	if exitCode != 30 {
+		t.Fatalf("expected exit code 30, got %d with output %s", exitCode, stdout)
+	}
+	assertErrorJSON(t, stdout, "invalid_input")
+}
+
+func TestUpdateRejectsNonOwner(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	threadID := seedClaimedThreadForInboxTests(t, dbPath, "leader", "worker-a", "worker-a")
+
+	stdout, _, exitCode := executeInboxCommand(
+		"--db", dbPath,
+		"--json",
+		"update",
+		"--agent", "worker-b",
+		"--thread", threadID,
+		"--status", "in_progress",
+		"--summary", "Implementation started",
+	)
+	if exitCode != 20 {
+		t.Fatalf("expected exit code 20, got %d with output %s", exitCode, stdout)
+	}
+	assertErrorJSON(t, stdout, "lease_conflict")
+}

packages/inbox-runtime/internal/cli/inbox/wait_reply.go

@@ -0,0 +1,85 @@
+package inbox
+
+import (
+	"fmt"
+	"time"
+
+	"ai-workflow-skill/packages/coord-core/protocol"
+	"ai-workflow-skill/packages/coord-core/store"
+
+	"github.com/spf13/cobra"
+)
+
+type waitReplyOptions struct {
+	threadID       string
+	afterMessageID string
+	afterEventID   int64
+	kinds          string
+	timeoutSeconds int
+}
+
+func newWaitReplyCmd(root *rootOptions) *cobra.Command {
+	opts := &waitReplyOptions{}
+
+	cmd := &cobra.Command{
+		Use:   "wait-reply",
+		Short: "Block until a reply-like message appears in a thread",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			ctx := cmd.Context()
+
+			sqlDB, err := openInboxDB(ctx, root.dbPath)
+			if err != nil {
+				return err
+			}
+			defer sqlDB.Close()
+
+			s := store.NewInboxStore(sqlDB)
+			agent := root.agent
+			result, err := s.WaitReply(ctx, store.WaitReplyInput{
+				ThreadID:       opts.threadID,
+				AfterMessageID: opts.afterMessageID,
+				AfterEventID:   opts.afterEventID,
+				Kinds:          parseCSV(opts.kinds),
+				Agent:          agent,
+				Timeout:        time.Duration(opts.timeoutSeconds) * time.Second,
+			})
+			if err != nil {
+				return err
+			}
+			if !result.Woke {
+				return protocol.NoMatchingWork("no matching reply before timeout")
+			}
+
+			data := map[string]any{
+				"woke":          result.Woke,
+				"next_event_id": result.NextEventID,
+			}
+			if result.Message != nil {
+				data["message"] = result.Message
+			}
+
+			resp := protocol.Success{
+				OK:      true,
+				Command: "wait-reply",
+				Data:    data,
+			}
+
+			if root.json {
+				return protocol.WriteJSON(cmd.OutOrStdout(), resp)
+			}
+
+			_, err = fmt.Fprintf(cmd.OutOrStdout(), "reply received on thread %s at event %d\n", result.Message.ThreadID, result.NextEventID)
+			return err
+		},
+	}
+
+	cmd.Flags().StringVar(&opts.threadID, "thread", "", "Thread ID")
+	cmd.Flags().StringVar(&opts.afterMessageID, "after-message", "", "Resume after a known message ID")
+	cmd.Flags().Int64Var(&opts.afterEventID, "after-event", 0, "Resume after a known event ID")
+	cmd.Flags().StringVar(&opts.kinds, "kinds", "answer,control,result", "Comma-separated message kinds to wake on")
+	cmd.Flags().IntVar(&opts.timeoutSeconds, "timeout-seconds", 0, "Maximum time to wait; 0 waits forever")
+
+	_ = cmd.MarkFlagRequired("thread")
+
+	return cmd
+}

packages/inbox-runtime/internal/cli/inbox/wait_reply_integration_test.go

@@ -0,0 +1,221 @@
+package inbox
+
+import (
+	"path/filepath"
+	"strconv"
+	"testing"
+	"time"
+)
+
+type waitReplyCommandResult struct {
+	stdout string
+	stderr string
+	exit   int
+}
+
+func TestWaitReplyWakesOnAnswerAfterMessage(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	threadID, blockedMessageID := seedBlockedThreadForWaitReply(t, dbPath)
+
+	waitCh := make(chan waitReplyCommandResult, 1)
+	go func() {
+		stdout, stderr, exitCode := executeInboxCommand(
+			"--db", dbPath,
+			"--agent", "worker-c",
+			"--json",
+			"wait-reply",
+			"--thread", threadID,
+			"--after-message", blockedMessageID,
+			"--timeout-seconds", "2",
+		)
+		waitCh <- waitReplyCommandResult{stdout: stdout, stderr: stderr, exit: exitCode}
+	}()
+
+	time.Sleep(200 * time.Millisecond)
+
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"reply",
+		"--from", "leader",
+		"--to", "worker-c",
+		"--thread", threadID,
+		"--summary", "Redirect to login",
+		"--body", "Redirect guests to login for the MVP.",
+	)
+
+	var waitResult waitReplyCommandResult
+	select {
+	case waitResult = <-waitCh:
+	case <-time.After(3 * time.Second):
+		t.Fatal("wait-reply command did not return")
+	}
+	if waitResult.exit != 0 {
+		t.Fatalf("wait-reply failed with exit=%d\nstderr:\n%s\nstdout:\n%s", waitResult.exit, waitResult.stderr, waitResult.stdout)
+	}
+
+	var waitResp map[string]any
+	mustDecodeJSON(t, waitResult.stdout, &waitResp)
+	if woke, ok := nestedValue(t, waitResp, "data", "woke").(bool); !ok || !woke {
+		t.Fatalf("expected wait-reply wake, got %#v", nestedValue(t, waitResp, "data", "woke"))
+	}
+	if kind := nestedString(t, waitResp, "data", "message", "kind"); kind != "answer" {
+		t.Fatalf("expected answer wake message, got %q", kind)
+	}
+}
+
+func TestWaitReplyCanStartFromAfterEvent(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	threadID, blockedMessageID := seedBlockedThreadForWaitReply(t, dbPath)
+
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"reply",
+		"--from", "leader",
+		"--to", "worker-c",
+		"--thread", threadID,
+		"--summary", "First answer",
+		"--body", "First reply payload.",
+	)
+
+	firstWaitOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--agent", "worker-c",
+		"--json",
+		"wait-reply",
+		"--thread", threadID,
+		"--after-message", blockedMessageID,
+		"--timeout-seconds", "2",
+	)
+	var firstWaitResp map[string]any
+	mustDecodeJSON(t, firstWaitOut, &firstWaitResp)
+	firstEventIDFloat, ok := nestedValue(t, firstWaitResp, "data", "next_event_id").(float64)
+	if !ok {
+		t.Fatalf("expected numeric next_event_id, got %#v", nestedValue(t, firstWaitResp, "data", "next_event_id"))
+	}
+	firstEventID := int64(firstEventIDFloat)
+
+	waitCh := make(chan waitReplyCommandResult, 1)
+	go func() {
+		stdout, stderr, exitCode := executeInboxCommand(
+			"--db", dbPath,
+			"--agent", "worker-c",
+			"--json",
+			"wait-reply",
+			"--thread", threadID,
+			"--after-event", strconv.FormatInt(firstEventID, 10),
+			"--timeout-seconds", "2",
+		)
+		waitCh <- waitReplyCommandResult{stdout: stdout, stderr: stderr, exit: exitCode}
+	}()
+
+	time.Sleep(200 * time.Millisecond)
+
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"reply",
+		"--from", "leader",
+		"--to", "worker-c",
+		"--thread", threadID,
+		"--summary", "Second answer",
+		"--body", "Second reply payload.",
+	)
+
+	var waitResult waitReplyCommandResult
+	select {
+	case waitResult = <-waitCh:
+	case <-time.After(3 * time.Second):
+		t.Fatal("wait-reply after-event command did not return")
+	}
+	if waitResult.exit != 0 {
+		t.Fatalf("wait-reply after-event failed with exit=%d\nstderr:\n%s\nstdout:\n%s", waitResult.exit, waitResult.stderr, waitResult.stdout)
+	}
+
+	var waitResp map[string]any
+	mustDecodeJSON(t, waitResult.stdout, &waitResp)
+	if got := nestedString(t, waitResp, "data", "message", "summary"); got != "Second answer" {
+		t.Fatalf("expected second answer wake message, got %q", got)
+	}
+	secondEventIDFloat, ok := nestedValue(t, waitResp, "data", "next_event_id").(float64)
+	if !ok {
+		t.Fatalf("expected numeric next_event_id, got %#v", nestedValue(t, waitResp, "data", "next_event_id"))
+	}
+	if int64(secondEventIDFloat) <= firstEventID {
+		t.Fatalf("expected second event id > first event id, got %d <= %d", int64(secondEventIDFloat), firstEventID)
+	}
+}
+
+func TestWaitReplyTimesOutWhenNoReply(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	threadID, _ := seedBlockedThreadForWaitReply(t, dbPath)
+
+	stdout, _, exitCode := executeInboxCommand(
+		"--db", dbPath,
+		"--agent", "worker-c",
+		"--json",
+		"wait-reply",
+		"--thread", threadID,
+		"--timeout-seconds", "1",
+	)
+	if exitCode != 10 {
+		t.Fatalf("expected wait-reply timeout exit code 10, got %d with %s", exitCode, stdout)
+	}
+	assertErrorJSON(t, stdout, "no_matching_work")
+}
+
+func seedBlockedThreadForWaitReply(t *testing.T, dbPath string) (threadID string, blockedMessageID string) {
+	t.Helper()
+
+	runInboxCommand(t, "--db", dbPath, "--json", "init")
+
+	sendOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", "leader",
+		"--to", "worker-c",
+		"--subject", "Investigate auth edge case",
+		"--summary", "Check auth redirect behavior",
+	)
+	var sendResp map[string]any
+	mustDecodeJSON(t, sendOut, &sendResp)
+	threadID = nestedString(t, sendResp, "data", "thread", "thread_id")
+
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"claim",
+		"--agent", "worker-c",
+		"--thread", threadID,
+	)
+
+	blockedOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"update",
+		"--agent", "worker-c",
+		"--thread", threadID,
+		"--status", "blocked",
+		"--summary", "Need policy decision",
+	)
+	var blockedResp map[string]any
+	mustDecodeJSON(t, blockedOut, &blockedResp)
+	blockedMessageID = nestedString(t, blockedResp, "data", "message", "message_id")
+	return threadID, blockedMessageID
+}
+

packages/inbox-runtime/internal/cli/inbox/watch.go

@@ -0,0 +1,90 @@
+package inbox
+
+import (
+	"fmt"
+	"time"
+
+	"ai-workflow-skill/packages/coord-core/protocol"
+	"ai-workflow-skill/packages/coord-core/store"
+
+	"github.com/spf13/cobra"
+)
+
+type watchOptions struct {
+	agent          string
+	statuses       string
+	timeoutSeconds int
+	afterEventID   int64
+}
+
+func newWatchCmd(root *rootOptions) *cobra.Command {
+	opts := &watchOptions{}
+
+	cmd := &cobra.Command{
+		Use:   "watch",
+		Short: "Block until new matching activity appears",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			ctx := cmd.Context()
+
+			agent := opts.agent
+			if agent == "" {
+				agent = root.agent
+			}
+
+			sqlDB, err := openInboxDB(ctx, root.dbPath)
+			if err != nil {
+				return err
+			}
+			defer sqlDB.Close()
+
+			s := store.NewInboxStore(sqlDB)
+			result, err := s.WatchThreads(ctx, store.WatchInput{
+				Agent:        agent,
+				Statuses:     parseCSV(opts.statuses),
+				AfterEventID: opts.afterEventID,
+				StartFromNow: !cmd.Flags().Changed("after-event"),
+				Timeout:      time.Duration(opts.timeoutSeconds) * time.Second,
+			})
+			if err != nil {
+				return err
+			}
+			if !result.Woke {
+				return protocol.NoMatchingWork("no matching work before watch timeout")
+			}
+
+			data := map[string]any{
+				"woke":          result.Woke,
+				"next_event_id": result.NextEventID,
+			}
+			if result.Thread != nil {
+				data["thread"] = result.Thread
+			}
+			if result.Message != nil {
+				data["message"] = result.Message
+			}
+			if result.Event != nil {
+				data["event"] = result.Event
+			}
+
+			resp := protocol.Success{
+				OK:      true,
+				Command: "watch",
+				Data:    data,
+			}
+
+			if root.json {
+				return protocol.WriteJSON(cmd.OutOrStdout(), resp)
+			}
+
+			_, err = fmt.Fprintf(cmd.OutOrStdout(), "watch woke on thread %s at event %d\n", result.Thread.ThreadID, result.NextEventID)
+			return err
+		},
+	}
+
+	cmd.Flags().StringVar(&opts.agent, "agent", "", "Assigned agent filter")
+	cmd.Flags().StringVar(&opts.statuses, "status", "pending,blocked,done,failed", "Comma-separated status filter")
+	cmd.Flags().IntVar(&opts.timeoutSeconds, "timeout-seconds", 0, "Maximum time to wait; 0 waits forever")
+	cmd.Flags().Int64Var(&opts.afterEventID, "after-event", 0, "Resume after a known event ID")
+
+	return cmd
+}

packages/inbox-runtime/internal/cli/inbox/watch_integration_test.go

@@ -0,0 +1,171 @@
+package inbox
+
+import (
+	"path/filepath"
+	"testing"
+	"time"
+)
+
+type watchCommandResult struct {
+	stdout string
+	stderr string
+	exit   int
+}
+
+func TestWatchWakesOnMatchingThread(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	runInboxCommand(t, "--db", dbPath, "--json", "init")
+
+	watchCh := make(chan watchCommandResult, 1)
+	go func() {
+		stdout, stderr, exitCode := executeInboxCommand(
+			"--db", dbPath,
+			"--json",
+			"watch",
+			"--agent", "worker-d",
+			"--status", "pending",
+			"--timeout-seconds", "2",
+		)
+		watchCh <- watchCommandResult{stdout: stdout, stderr: stderr, exit: exitCode}
+	}()
+
+	time.Sleep(200 * time.Millisecond)
+
+	sendOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", "leader",
+		"--to", "worker-d",
+		"--subject", "Build admin editor",
+		"--summary", "Create the first editor screen",
+	)
+	var sendResp map[string]any
+	mustDecodeJSON(t, sendOut, &sendResp)
+	threadID := nestedString(t, sendResp, "data", "thread", "thread_id")
+
+	var watchResult watchCommandResult
+	select {
+	case watchResult = <-watchCh:
+	case <-time.After(3 * time.Second):
+		t.Fatal("watch command did not return")
+	}
+	if watchResult.exit != 0 {
+		t.Fatalf("watch failed with exit=%d\nstderr:\n%s\nstdout:\n%s", watchResult.exit, watchResult.stderr, watchResult.stdout)
+	}
+
+	var watchResp map[string]any
+	mustDecodeJSON(t, watchResult.stdout, &watchResp)
+	if woke, ok := nestedValue(t, watchResp, "data", "woke").(bool); !ok || !woke {
+		t.Fatalf("expected watch to wake, got %#v", nestedValue(t, watchResp, "data", "woke"))
+	}
+	if got := nestedString(t, watchResp, "data", "thread", "thread_id"); got != threadID {
+		t.Fatalf("expected woken thread %q, got %q", threadID, got)
+	}
+	nextEventID, ok := nestedValue(t, watchResp, "data", "next_event_id").(float64)
+	if !ok {
+		t.Fatalf("expected numeric next_event_id, got %#v", nestedValue(t, watchResp, "data", "next_event_id"))
+	}
+	eventID, ok := nestedValue(t, watchResp, "data", "event", "event_id").(float64)
+	if !ok {
+		t.Fatalf("expected numeric event_id, got %#v", nestedValue(t, watchResp, "data", "event", "event_id"))
+	}
+	if nextEventID != eventID {
+		t.Fatalf("expected next_event_id == event.event_id, got %v vs %v", nextEventID, eventID)
+	}
+}
+
+func TestWatchRespectsStatusFilter(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	runInboxCommand(t, "--db", dbPath, "--json", "init")
+
+	sendOut := runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"send",
+		"--from", "leader",
+		"--to", "worker-c",
+		"--subject", "Investigate policy edge case",
+		"--summary", "Initial request",
+	)
+	var sendResp map[string]any
+	mustDecodeJSON(t, sendOut, &sendResp)
+	threadID := nestedString(t, sendResp, "data", "thread", "thread_id")
+
+	watchCh := make(chan watchCommandResult, 1)
+	go func() {
+		stdout, stderr, exitCode := executeInboxCommand(
+			"--db", dbPath,
+			"--json",
+			"watch",
+			"--agent", "worker-c",
+			"--status", "blocked",
+			"--timeout-seconds", "2",
+		)
+		watchCh <- watchCommandResult{stdout: stdout, stderr: stderr, exit: exitCode}
+	}()
+
+	time.Sleep(200 * time.Millisecond)
+
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"claim",
+		"--agent", "worker-c",
+		"--thread", threadID,
+	)
+	runInboxCommand(
+		t,
+		"--db", dbPath,
+		"--json",
+		"update",
+		"--agent", "worker-c",
+		"--thread", threadID,
+		"--status", "blocked",
+		"--summary", "Need policy decision",
+	)
+
+	var watchResult watchCommandResult
+	select {
+	case watchResult = <-watchCh:
+	case <-time.After(3 * time.Second):
+		t.Fatal("watch command did not return")
+	}
+	if watchResult.exit != 0 {
+		t.Fatalf("watch failed with exit=%d\nstderr:\n%s\nstdout:\n%s", watchResult.exit, watchResult.stderr, watchResult.stdout)
+	}
+
+	var watchResp map[string]any
+	mustDecodeJSON(t, watchResult.stdout, &watchResp)
+	if status := nestedString(t, watchResp, "data", "thread", "status"); status != "blocked" {
+		t.Fatalf("expected blocked status wake, got %q", status)
+	}
+}
+
+func TestWatchTimesOutWithNoActivity(t *testing.T) {
+	t.Parallel()
+
+	dbPath := filepath.Join(t.TempDir(), "coord.db")
+	runInboxCommand(t, "--db", dbPath, "--json", "init")
+
+	stdout, _, exitCode := executeInboxCommand(
+		"--db", dbPath,
+		"--json",
+		"watch",
+		"--agent", "worker-d",
+		"--status", "pending",
+		"--timeout-seconds", "1",
+	)
+	if exitCode != 10 {
+		t.Fatalf("expected watch timeout exit code 10, got %d with %s", exitCode, stdout)
+	}
+	assertErrorJSON(t, stdout, "no_matching_work")
+}
+