# Inbox `fail` Test Plan Index

## Case Files

| Case Slug | File | Coverage Note |
| --- | --- | --- |
| `fail-marks-thread-failed` | [fail-marks-thread-failed.md](./fail-marks-thread-failed.md) | marks a claimed thread as `failed` with a result message |
| `fail-persists-failure-body-and-artifact` | [fail-persists-failure-body-and-artifact.md](./fail-persists-failure-body-and-artifact.md) | persists failure body and artifacts for diagnosis |
| `fail-rejects-non-owner` | [fail-rejects-non-owner.md](./fail-rejects-non-owner.md) | rejects `fail` from non-owner agent |
| `fail-rejects-on-terminal-thread` | [fail-rejects-on-terminal-thread.md](./fail-rejects-on-terminal-thread.md) | rejects `fail` on terminal thread states |