e3f8347be3
* feat(file_tools): harden read_file with size guard, dedup, and device blocking Three improvements to read_file_tool to reduce wasted context tokens and prevent process hangs: 1. Character-count guard: reads that produce more than 100K characters (≈25-35K tokens across tokenisers) are rejected with an error that tells the model to use offset+limit for a smaller range. The effective cap is min(file_size, 100K) so small files that happen to have long lines aren't over-penalised. Large truncated files also get a hint nudging toward targeted reads. 2. File-read deduplication: when the same (path, offset, limit) is read a second time and the file hasn't been modified (mtime unchanged), return a lightweight stub instead of re-sending the full content. Writes and patches naturally change mtime, so post-edit reads always return fresh content. The dedup cache is cleared on context compression — after compression the original read content is summarised away, so the model needs the full content again. 3. Device path blocking: paths like /dev/zero, /dev/random, /dev/stdin etc. are rejected before any I/O to prevent process hangs from infinite-output or blocking-input devices. Tests: 17 new tests covering all three features plus the dedup-reset- on-compression integration. All 52 file-read tests pass (35 existing + 17 new). Full tool suite (2124 tests) passes with 0 failures. * feat: make file_read_max_chars configurable, add docs Add file_read_max_chars to DEFAULT_CONFIG (default 100K). read_file_tool reads this on first call and caches for the process lifetime. Users on large-context models can raise it; users on small local models can lower it. Also adds a 'File Read Safety' section to the configuration docs explaining the char limit, dedup behavior, and example values.
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