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Lukas Moschitz
a19ed403cf
Two independent fastapi divergences from the green north-star kept this red:
1. Missing chunkSize:9999 on the 8 tool-call fixtures. Under aimock's global
8-byte chunking the large tool-call args failed to JSON-parse in one piece,
so the AAPL->MSFT reasoning chain stopped at leg 1 (turns 1 & 2). Byte-align
to LGP (and the green mastra/langgraph-typescript siblings carry the same
pattern).
2. Fixture-pool shadowing broke turn 3. aimock pools all d4+d6 fixtures for a
context and matches by userMessage substring, first-match-wins in load order
(d4 before d6). fastapi had broad keys LGP doesn't:
- d4/chat.json: 'weather' -> 'weather in San Francisco', 'flights from SFO
to JFK' -> 'Find flights from SFO to JFK.' (period-terminated so it stops
being a substring of turn 3's 'Find flights from SFO to JFK and show me
the weather there.').
- tool-rendering-{custom,default}-catchall.json: bare 'Find flights' ->
'Find flights from SFO to JFK.' (now matches LGP's exact key).
Also byte-align the backend agent to LGP: scriptable get_stock_price signature,
the detailed chaining system prompt, model gpt-5.4, reasoning summary detailed.
D6 tool-rendering-reasoning-chain green (two real ~21s runs). Shared-fixture
regression all green: agentic-chat, tool-rendering, tool-rendering-custom-catchall,
tool-rendering-default-catchall, headless-complete (Tokyo-weather consumer).