Files
gbrain/test
Garry TanandClaude Opus 4.8 1677caab51 fix(gateway): AI SDK v6 toolLoop compat — multi-turn tool calls work again
The ai@6.x bump tightened ModelMessage + tool-schema validation, which
silently broke every multi-turn tool loop. Both `gbrain skillopt` rollouts
and production background `subagent` jobs route through `chat()`/`toolLoop`
and crashed the moment the model called a tool ("messages do not match the
ModelMessage[] schema" / "schema is not a function"). Surfaced end-to-end
by the SkillOpt real-LLM eval.

Three fixes:
- chat(): wrap tool defs with the SDK's `jsonSchema()` helper instead of a
  bare `{jsonSchema}` object (v6 asSchema() treated the bare object as a
  thunk and threw).
- chat(): new exported pure `toModelMessages()` converts gbrain's
  provider-neutral ChatMessage[] into v6 ModelMessage[] — tool results ride
  a dedicated `role:'tool'` message with structured `{type,value}` output;
  null output preserved as json null. Load-bearing for the production
  subagent path, not just skillopt.
- rollout.ts: replace the inline params→schema mapper (dropped `items` on
  array params) with the shared `paramDefToSchema` single source of truth.

Pinned by test/gateway-model-messages.test.ts (8 cases). Folds into the
open v0.42.9.0 PR (#1759) — these complete the eval-readiness wave by
making skillopt actually run against a live model.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-01 23:20:28 -07:00
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