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Author SHA1 Message Date
mathiasandClaude Opus 5.5 27a01dd2af fix(brain): context, brain_get and brain_read read through brainfs (#157, slice 2) (#165)
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readExcerpt, ReadNote and ReadScoped now read through brainfs (os.Root, regular files only, type checked on the opened handle), so a symlink swapped in after a check is not followed and a FIFO does not hang the reader. ReadRegularMax bounds the read itself with io.LimitReader(max+1). notes.Target carries the brain root.

Refs #157. Adversarial review round 2: PASS (round 1 BLOCKED: unbounded read, rule-9 test names).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Mathias <mthbqv@gmail.com>
2026-10-04 05:59:55 +00:00
mathias 055af368cd feat(mcp): brain_read + brain_edit, contained to the sync source (brain#4) (#96)
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brain_read returns a note verbatim; brain_edit is str_replace with an
exactly-once match, operating on the tree brain-sync commits from.

An adversarial design review before implementation changed three things:

1. Governance files are not in the model-facing tool. Brain content is
   ingested from the outside world and reaches a model's context, and that
   model would hold the editor — one poisoned page could rewrite the
   CLAUDE.md a .dispatch-allow agent later loads as instructions. And
   brain-sync merges with --strategy-option=ours, so the live tree beats a
   human's corrective push on the conflicting lines. CLAUDE.md now goes
   through brain_edit_root: de-surfaced from tools/list and gated on the
   local static principal. The scopes are disjoint — the privileged door
   has the smaller reach.

2. Reads needed the same allowlist, and brain_get already lacked it: it
   returned verbatim session transcripts under archive/ by path. A test
   proved the exposure live before the fix.

3. Canonicalise before allowlisting — knowledge/../.git/hooks/post-commit
   would otherwise reach a hook that brain-sync executes in a pod holding
   the Gitea push credentials.

Plus overlapping match counting, UTF-8 validation both ways, refusal while
git is mid-operation, flock with the read inside the lock, atomic
same-dir rename, and reindex only when frontmatter is touched.

Refs brain#4.

Co-authored-by: Mathias <mthbqv@gmail.com>
2026-08-18 18:14:05 +00:00