chore: remove unused oaiBuildFunctionInfo helper

[detail-app]

Description

Removes the unused oaiBuildFunctionInfo helper from agents/src/llm/utils.ts and its re-export from the llm namespace. Also drops the now-unused value import of FunctionCall (kept as a type-only import).

Changes Made

• Removed the oaiBuildFunctionInfo function from agents/src/llm/utils.ts.
• Removed the oaiBuildFunctionInfo re-export from agents/src/llm/index.ts.
• Changed the FunctionCall import in agents/src/llm/utils.ts to type-only (its only remaining use is a type annotation on executeToolCall's parameter).
• Regenerated agents/etc/agents.api.md via pnpm api:update.

Pre-Review Checklist

• Build passes: typecheck, build, lint, and api:check all pass locally.
• AI-generated code reviewed.
• Changes explained: see below.
• Scope appropriate: all changes relate to removing this one symbol.
• Video demo: not applicable — no runtime behavior change.

Testing

• Automated tests added/updated: not applicable — pure removal with no behavior change.
• All tests pass: pnpm vitest run agents/src/llm/utils.test.ts agents/src/llm/tool_context.test.ts (130 passed).
• restaurant_agent.ts and realtime_agent.ts: not applicable — no runtime behavior change.

Additional Notes

oaiBuildFunctionInfo had zero callers anywhere in the repo — no production code, no tests, no plugins — making it a stale leftover utility. The neighboring oaiParams and OpenAIFunctionParameters were deliberately kept: oaiParams is exercised by tests (removing it would require deleting test consumers), and OpenAIFunctionParameters is a publicly-exported type (no @internal tag) used as oaiParams' return type.

History

• Last materially changed June 2025 (brianyin/ajs-88-add-tool-class-generic-tool-typing #438 @toubatbrian)

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[devin-ai-integration]

✅ Devin Review: No Issues Found

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