Sonarly Claude Code 7f6486a0ae fix(ai-chat): use AGENT_NOT_FOUND instead of AGENT_EXECUTION_FAILED for missing threads
https://sonarly.com/issue/28252?type=bug

When a user queries an AI chat thread that doesn't exist (deleted, stale reference, or wrong userWorkspaceId), the server returns a 500 InternalServerError instead of a 404 NotFoundError because the code uses the wrong AgentExceptionCode.

Fix: Changed all "Thread not found" and "Queued message not found" throw sites in the AI chat module from `AgentExceptionCode.AGENT_EXECUTION_FAILED` to `AgentExceptionCode.AGENT_NOT_FOUND`.

**Why:** `AGENT_EXECUTION_FAILED` maps to `InternalServerError` (500) in the GraphQL exception handler. Missing threads/messages are a normal not-found condition, not an execution failure. `AGENT_NOT_FOUND` already exists and correctly maps to `NotFoundError` (404) in both the GraphQL handler and REST filter.

**7 sites fixed across 4 files:**
- `agent-chat.service.ts`: `getThreadById()` and `getMessagesForThread()`
- `agent-chat-streaming.service.ts`: `streamAgentChat()`
- `agent-chat.resolver.ts`: `sendChatMessage()`, `deleteQueuedChatMessage()` (2 checks: queued message + thread)
- `agent-chat-subscription.resolver.ts`: `onAgentChatEvent()`

This stops the `GetChatMessages` query (and all other chat operations) from producing 500 errors when a thread is not found, reducing Sentry noise and returning correct HTTP semantics to the frontend.
2026-04-17 16:11:09 +00:00
2026-04-11 10:00:24 +00:00

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