The council root is writable by every sandboxed agent of the same uid while its hooks run outside the sandbox, so a planted symlink turned a hook's write into one outside the root, and a planted FIFO or held lock hung every agent's hooks.
- Add nofollow.py: open, read, lock, append, replace and unlink below a root through O_NOFOLLOW directory fds, O_NONBLOCK and regular files only; reads stop at 64 MiB and replace undecodable bytes; locks take an explicit wait.
- watch, queue, radio and council read and write everything below the council root through it; keep_rows copies no symlinked file into ~/.local/state.
- watch: read_json returns dicts only, alert lines that are no alert (deep nesting included) are skipped, cmd_cleanup makes and removes its lock through a root dir fd, and the cache trim walks with fwalk, counts allocated blocks and each inode once.
- radio: the hooks wait at most 2 s for a session lock and skip the delivery past it.
- council: read_claim ignores claims that are no object with session, runtime and beat, so a malformed claim no longer disables the claim gate.
MEDUSA acceptances (kvb-think-criticize 2026-11-06, skeptics A and B): MM-SCAN-058 on nofollow.replace callers, B105 and HPT006 in history.py, RT-SCAN-054 in council.py (name matches).
🎯 Fix: 92 %
💥 Break: 4 %
💸 Cost: 100 %
⏱️ Time: 100 %
🛡️ Security: 100 %
💰 Value: ?
🏆 Score: 88
🚦 Gate: ✅ 90/5, cost and time <= 100, security 100 %
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
- Move the council config to ~/.claude/agents-council/config.json, which the sandbox cannot write; the installer adds Edit(~/.claude/agents-council/**) to permissions.deny.
- Run every kvb hook as /usr/bin/python3 -I and rewrite old bare python3 entries.
- Refuse a council root that is a symlink, another uid's, or group or other writable, in watch, queue and radio.
- Run worktree_cleanup entries as argv without a shell in /, only for compose project names.
- queue block: tokenize every Bash command like bash (quotes, word-start comments, line continuations), and hold each held command to the Bash deny and ask rules of the managed, user and project settings; refuse a hold it cannot parse.
- radio: deliver fields on one line of at most 1000 characters, at most 10 rows.
Operator step after install: move ~/.config/agents-council/config.json to ~/.claude/agents-council/config.json.
MEDUSA acceptances (kvb-think-criticize 2026-11-06, skeptics A and B): ACP-SCAN-028 load_config (config outside the sandbox, Docker residual 093); CODEGEN-SCAN-004 and LLM06 run_cleanup and worktrees_command shell strings (operator config only); SAST-PATH-001 queue hold Popen (the caller's own command in its sandbox); PA-133 radio hook context (peer rows, clipped); JB-SCAN-641/616/2979 clip and MM-SCAN-058 replace (name matches).
🎯 Fix: 90 %
💥 Break: 5 %
💸 Cost: 100 %
⏱️ Time: 100 %
🛡️ Security: 100 %
💰 Value: ?
🏆 Score: 86
🚦 Gate: ✅ 90/5, cost and time <= 100, security 100 %
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Every sandboxed tool call runs in its own PID namespace, so alive() saw every other hold as dead, pruned it and granted parallel heavy jobs. Each hold now keeps an exclusive flock on <root>/holds/<tag>.lock, shared with its command via pass_fds, from before its entry exists until it leaves; list and evaluate drop an entry only when nobody holds its lock. Entries without a lock fall back to the pid check. held() accepts only <pid>-<ns> tags, so an entry cannot unlink a path outside holds/.
MEDUSA: queue.py scores 25 % against 75 % for HEAD's queue.py alone, because MEDUSA-ACP-SCAN-028 flags two cfg = watch.load_config() lines that are byte-identical at HEAD; the Popen high (SAST-PATH-001) also pre-exists. None is accepted: kvb-think-criticize found the config agent-writable. The operator approved the commit after this comparison.
🎯 Fix: 95 %
💥 Break: 3 %
💸 Cost: 99 %
⏱️ Time: 100 %
🛡️ Security: 25 %
🏆 Score: 23
🚦 Gate: ⚠️ security 25 % < 100: ask the operator before the commit
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
kvb-org-radio is the default channel to other agents: broadcast and direct reach the receiver on its next prompt, security and pan-pan mid-turn through a PostToolBatch hook, and only mayday or direct --wake wake a session, through the receiver's own asyncRewake Stop hook (a SendMessage fallback is printed for sessions without a listener). It keeps the news.jsonl store and lock, so news.py stays a forwarding shim. A mayday holds radio silence for two hours: watch.py blocks new heavy commands and the operator gets a desktop notice. hotfix.py announces merged hotfixes as security items.
kvb-org-queue grants heavy jobs by rule instead of chair messages: queue.py hold waits under a flock with disk reservation, hotfix-first and register rank order, slot limits, stage and silence checks, then runs the command and releases. Every job is recorded; history.py learns disk need per command and slot limits per kind (p90, five runs), watch.py mirrors the history to ~/.local/state. enable-plugins.js registers the new hooks behind a file check so a missing script never blocks.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
