A binding may declare `tools` with named roots. pi starts with
--no-builtin-tools and the package's own extension, allowlisting
list_dir, read_file and search. src/tools.mjs holds the rules: names
not paths, per-segment lstat walk, one checked descriptor read that
refuses symlinks, swaps, FIFOs, hard links and oversize files, credential
shapes refusing the whole read, and a per-message call budget. The engine
settles on agent_end and records tool calls in the turn record.
Jason's rulings R1-R7 in the brief, section 7. rev-code-02 approved
round 2 (comment 26276) on tree 43f0329b after four round 1 fixes.
Suite 48/48, node tests 116. Not pushed.
Co-Authored-By: Claude Opus 5 <[email protected]>
jason.woltjeandClaude Opus 5
1ac812d3d5