docs(agent-ui): document HTTP error codes for POST endpoints

After the fix in c708f698, POSTs no longer always return 200 — they use
semantic status codes: 400 for bad input, 409 for retryable state
conflicts (turn in flight, hive-c0re busy), 500 only for genuine failures.
Update the preamble to the Per-agent endpoints section to reflect this.
This commit is contained in:
iris 2026-07-04 13:38:26 +02:00 committed by mara
commit 8e441ead93

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@ -277,9 +277,14 @@ Unknown `/foo` shows an error row instead of being silently sent.
## Per-agent endpoints
All POSTs return 200 (no 303 redirects). The matching mutations
fire `LiveEvent` variants on the per-agent bus, so the client
doesn't refetch `/api/state` on submit — the SSE stream
Successful POSTs return 200 (no 303 redirects). Error responses
use semantic status codes: **400** for missing/invalid input
(`body` required, unknown model name, invalid effort level),
**409** for retryable state conflicts (turn in flight when
`/compact` is called, hive-c0re busy on `/api/state`),
**500** only for genuine server/transport failures. The matching
mutations fire `LiveEvent` variants on the per-agent bus, so the
client doesn't refetch `/api/state` on submit — the SSE stream
delivers the new state faster anyway. Only the login flow still
polls (session output streams in updates that aren't event-
shaped).