Bartok9 e527240b27 fix(tools): write_file handler now rejects missing 'content'/'path' args instead of silently writing zero-byte files (#19096) ...

Under context pressure, frontier models sometimes emit tool calls with
required fields dropped. Previously _handle_write_file() used
args.get('content', '') which substituted an empty string for the missing
key, returned success with bytes_written=0, and created a zero-byte file
on disk. The model had no way to detect the failure.

Changes:
- Reject calls where 'path' is absent or not a non-empty string
- Reject calls where 'content' key is entirely absent (key-presence check,
  not truthiness) — distinguishing a legitimately empty file from a dropped arg
- Reject calls where 'content' is a non-string type
- All error messages include guidance to re-emit the tool call or switch
  to execute_code with hermes_tools.write_file() for large payloads
- Explicit empty string content (file truncation) continues to work

Regression tests added for all four cases: missing path, missing content,
explicit-empty content, and wrong content type.

Fixes #19096

2026-05-03 08:52:41 -07:00

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