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feat(discord): read-only tools for the Discord Sage through a Mosaic pi extension confined to declared roots (#1509)

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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]>
This commit is contained in:
jason.woltje
2026-09-14 19:52:21 -05:00
co-authored by Claude Opus 5
parent c4fc8e7d7f
commit 1ac812d3d5
24 changed files with 1269 additions and 44 deletions
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docs/SESSIONS.md
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@@ -253,3 +253,4 @@ are never rewritten or removed; corrections are new entries.
- 2026-09-13 UTC — coordinator (Claude) — Discord read receipt live check (#1509, QUEUE row 15): reaction confirmed on a live message at 19:21 UTC, turn record receipt ok true, private evidence receipt written, row 15 done. Committed; push on Jason's say-so.
- 2026-09-13 UTC — coordinator (Claude) — Discord service unit (#1509, QUEUE row 17): `run --supervised` and `recover`, exit 3 for brakes, `scripts/discord-service.sh`, systemd user unit; suite 40/40 (95 node tests); Sage seat migrated from tmux to `mosaic-discord@shared-signals`, kill and brake checks passed live. Committed; push on Jason's say-so.
- 2026-09-13 UTC — coordinator (Claude) — Discord binding reload and per-user channels (#1509, QUEUE rows 19–20): `reload`/SIGHUP with fixed keys refused, `reloads.jsonl`, user `channels` allowlist; suite 41/41, 101 node tests; Carmen enrolled live by reload at 00:03 UTC, her first message pending; row 18 assigned to darkwing by Jason.
- 2026-09-14 UTC — coordinator (Claude) — Discord read-only tools (#1509, QUEUE row 21): `tools` binding key, host pi extension `list_dir`/`read_file`/`search` confined to declared roots, engine settles on `agent_end`, tool calls in the turn record; rev-code-02 round 2 APPROVE (26276) after four round 1 findings were fixed; suite 48/48, 116 node tests; committed locally, not pushed; live check in #sage-admin next.