## Rationale
When `StreamAgentChatJob` can't find the workspace, it publishes a
transient `stream-error` event and **returns before the try/finally
exists** (`stream-agent-chat.job.ts`). Consequences on main:
- `activeStreamId` is never cleared → every subsequent send in that
thread queues behind a dead claim, forever;
- no `lastStreamError` is persisted → nothing renders after a reload,
and Retry has nothing to retry;
- nothing throws → **zero telemetry**. Sentry confirms: the "Workspace
not found" issues that exist are all auth/Stripe paths — this path fails
in complete silence.
## Why this is the root cause, not a symptom patch
The job's catch/finally already implement the correct failure contract
for *every other* error: persist a typed `lastStreamError`, publish the
typed event, release the claim guarded on the observed streamId. The bug
is that one code path bypasses that contract via an early return. The
fix removes the bypass — the lookup moves inside the `try` and throws a
typed `AiException(WORKSPACE_NOT_FOUND)` — rather than duplicating
cleanup in the early-return branch (which would be the symptom patch,
and would drift the next time the contract changes).
The alternative "prevent the job from existing when the workspace is
gone" isn't achievable: workspace deletion between enqueue and pickup is
an inherent race, so the job must handle it regardless.
## User impact
A workspace deleted/deactivated mid-flight currently bricks the thread
silently (the user just sees sends vanish into a queue). With this, the
failure is visible (typed error message), recoverable (standard
failed-turn state), and observable (real exception in monitoring).
## Stack
Based on #22479 (spec harness) — it extends the same spec file with the
regression test. `WORKSPACE_NOT_FOUND` is a TypeScript enum member, not
a GraphQL schema change: no client-sdk regeneration needed.
## Test plan
- [x] Regression test: missing workspace → typed rejection,
`lastStreamError` persisted, terminal event published, claim released
- [ ] CI green
https://claude.ai/code/session_01Lyi6zTema2FMVVh8MD6c38
---
_Generated by [Claude
Code](https://claude.ai/code/session_01Lyi6zTema2FMVVh8MD6c38)_
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Félix Malfait
3b76ec528f
