The support chat showed 'Tänker' and then went quiet with no answer and
no error. Root cause: the 2026-08-21 RIP-3 cutover moved general.help to
the single-call POST /api/agent/ask, whose 1500-token default cap made
stop_reason max_tokens routine on tool-loop turns. The empty answer then
passed unlogged through the service, the route answered 200 with an
empty string, and the console appended an invisible empty bubble.
Fixes, single-call path:
- ask-service: default maxTokens 1500 -> 5400 (the streaming chat's
reply ceiling); an empty final answer now logs model + usage and
throws the typed EmptyModelAnswerError instead of passing through.
- /api/agent/ask: maxDuration 300, logger, empty answer maps to 502
with 'Assistenten gav inget svar. Försök igen.'; an empty assistant
turn is never persisted (the question stays, so retry works).
- AskConsole: a 200 with an empty answer shows the error box instead of
appending an invisible bubble.
- anthropic-family: serialized tool results are bounded at 40000 chars
(mirrors run-turn) so one big read cannot eat the output budget; the
step-exhausted fallback keeps tools declared with tool_choice none,
because replaying tool_use/tool_result without tools is an API 400.
Fixes, streaming path (same silent class):
- /api/agent/invoke: maxDuration 300 so deep thinking turns are not
killed mid-stream at the platform default cap.
- run-turn: stop_reason max_tokens with no visible text emits an error
event, not a bare turn_complete.
- AgentChat: an NDJSON stream that ends without turn_complete or error
(and was not aborted) shows 'Anslutningen bröts innan svaret blev
klart. Försök igen.'
The lib/ai request-shape tests were updated deliberately for the
fallback change; general.help stays on the single-call runtime
(founder decision, not reverted).
Claude-Session: https://claude.ai/code/session_01SyDuePXxUFowaPBKpAv8SF
Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
Jakob Wennberg
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