Teknium 35d280d0bd feat: coerce tool call arguments to match JSON Schema types (#5265) ...

LLMs frequently return numbers as strings ("42" instead of 42) and
booleans as strings ("true" instead of true). This causes silent
failures with MCP tools and any tool with strictly-typed parameters.

Added coerce_tool_args() in model_tools.py that runs before every tool
dispatch. For each argument, it checks the tool registry schema and
attempts safe coercion:
  - "42" → 42 when schema says "type": "integer"
  - "3.14" → 3.14 when schema says "type": "number"
  - "true"/"false" → True/False when schema says "type": "boolean"
  - Union types tried in order
  - Original values preserved when coercion fails or is not applicable

Inspired by Block/goose tool argument coercion system.

2026-04-05 10:57:34 -07:00

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