Jean-Pierre

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Reject malformed streamed tool-call argument JSON ​

  • Status: Todo
  • Kind: Bug
  • Authors: jp
  • Date: 2026-08-21
  • Label: domain=llm
  • Label: package=jp_llm
  • Label: type=bug

EventBuilder converts malformed tool-call argument JSON into an empty map and emits a normal ToolCallRequest (crates/jp_llm/src/event_builder.rs). A truncated provider stream can therefore execute a no-argument tool or a tool whose defaults fill the missing fields.

Acceptance criteria:

  • A tool-call buffer containing malformed JSON must not become a valid empty argument map.
  • Surface a specific invalid-call response or stream error that can be recorded and returned to the model.
  • Prove that the tool executor is not invoked.
  • Cover truncated JSON, a non-object top-level value, and valid {} separately.
  • Add a test that fails against the current fallback behavior.