shard(tick): 0230Z — multi-Otto contamination caught + #3339/#3349 close-out#3356
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Pull request overview
Adds the 0230Z hygiene-history tick shard to preserve the operational substrate trail for PR #3339 / #3349 close-out and the mid-tick multi-Otto contamination observation.
Changes:
- Add a new tick shard entry for 2026-05-15 0230Z documenting PR gate states, resolved Copilot threads, and worktree handling.
- Record cross-PR dependency notes and the cron sentinel state for continuity across ticks.
Comments suppressed due to low confidence (1)
docs/hygiene-history/ticks/2026/05/15/0230Z.md:15
- P1 (xref): The relative link to
.claude/rules/claim-acquire-before-worktree-work.mdis also one..short. Other ticks at this same depth use../../../../../../.claude/...;../../../../../.claude/...will resolve todocs/.claude/...and break.
This is the exact pattern documented in [B-0519 RCA](../../../../backlog/P3/B-0519-multi-otto-branch-state-contamination-rca-2026-05-14.md). The branch-guard inline check (`test "$(git branch --show-current)" = "<expected>"`) is the substrate-honest primary catch — and it would have prevented a wrong-branch commit if I'd tried. Instead, I pivoted to a dedicated worktree at `/tmp/zeta-otto-cli-fix-3349-threads` per [`.claude/rules/claim-acquire-before-worktree-work.md`](../../../../../.claude/rules/claim-acquire-before-worktree-work.md) Worktree force-remove guard (clause 1: create a new worktree at a different path).
Both Copilot and Codex flagged that the tick shard's relative links were off by one directory level. From the shard's location (docs/hygiene-history/ticks/2026/05/15/0230Z.md): - `../../../../backlog/...` resolved under docs/hygiene-history/backlog (4 levels up only reaches docs/hygiene-history/, not docs/) - `../../../../../.claude/rules/...` similarly off by one for top-level Correct depths from this shard location: - docs/backlog/...: 5x `../` (verified with `ls -la` from the shard dir) - .claude/rules/...: 6x `../` (verified with `ls -la` from the shard dir) Both links now resolve. Composes with the prior `5x .. → 6x ..` fix on the 0027Z shard (#3330) — same class of error, same family of fix. Co-Authored-By: Claude <noreply@anthropic.com>
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Field-test in the 2026-05-15 Otto-CLI session surfaced a contamination mechanism not in the original 6 patterns: a peer agent's mid-interactive- rebase state, left sitting in `.git/rebase-merge/` for hours, can be resumed by another process and detach HEAD on the peer's branch mid-tick. Distinct from Patterns 1-6 (checkout/reset races) because the contaminating event is paused-then-resumed metadata, not a fresh checkout. Branch-guard defense (Pattern 5) caught it. Added: - Pattern 7 section with full forensics + field-test shard pointers (0213Z + 0230Z, both merged via PR #3356) - Cheap mechanization candidate: `tools/hygiene/check-stale-rebase-state.ts` diagnostic that warns on `.git/rebase-merge/` older than 1h - last_updated frontmatter bumped to 2026-05-15 Substrate-honest stance preserved: do not touch peer's rebase state. Pivot to dedicated worktrees; branch refs are global, so work lands on the right ref regardless. Verified: markdownlint clean. Co-Authored-By: Claude <noreply@anthropic.com>
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…h A defense-in-depth) (#3342) * feat(shadow): launchd LaunchAgent template — durable tick source (Path A defense-in-depth) Per Aaron 2026-05-15T~01:11Z: 'whatever composes best always good to have defense in depth.' This is Path A of the defense-in-depth composition for the shadow observation loop tick source. Two new files under tools/shadow/launchd/: 1. com.zeta.shadow-observer.plist — macOS LaunchAgent template - RunAtLoad (starts at user login) - KeepAlive on Crashed (auto-restart on crash) - ThrottleInterval 60s (prevents fast crash-loops) - Polls every 2s; accepts after 3s delay - Defaults to --dry-run for safety (live mode after verify) - Logs to tools/shadow/shadow-observer.{log,stdout.log,stderr.log} - __BUN_PATH__ and __REPO_ROOT__ placeholders for sed-substitution 2. README.md — install procedure - Step 1: configure plist (sed-substitute placeholders) - Step 2: grant accessibility permission (System Settings) - Step 3: launchctl load + verify - Step 4: test in dry-run mode - Step 5: switch to live mode (only after dry-run works) - Uninstall procedure - Troubleshooting (common failure modes) - Composition table (A/B/C defense-in-depth) Composes with: - tools/shadow/shadow-observer.ts (the process launched) - docs/backlog/P0/B-0402 (originating backlog row) - .claude/rules/shadow-star-shorthand-autocomplete-marker.md - .claude/skills/save-ai-memory/SKILL.md Path B (CronCreate sentinel) + Path C (manual one-line) are defense-in-depth supplements; this PR ships Path A as primary. Co-Authored-By: Claude <noreply@anthropic.com> * fix(shadow-launchd): address 5 review threads on PR #3342 Five Copilot / Codex review findings resolved: P1 (Copilot) — broken provenance in README header: Dropped first-name attribution + user-scope memory-file glob that doesn't resolve in-repo. Per docs/AGENT-BEST-PRACTICES.md §671-685, current-state surfaces (this README) use role-refs. Other rule references now use relative links that resolve from the README's location. P1 (Copilot) — sed escaping in install instructions: The documented `sed` recipe would break on paths containing `&`, `|`, `\`, or newlines. Replaced with a TypeScript installer (tools/shadow/launchd/install-launchagent.ts) that: - uses String.replaceAll (metacharacter-safe) - sanity-checks for unsubstituted placeholders - runs plutil -lint before writing - backs up any existing plist before overwriting - optionally bootstraps via launchctl Placeholder syntax changed from `__NAME__` to `{{NAME}}` so the template header comment can describe them without being substituted itself. P1 (Copilot) — rule file referenced from plist not in tree: The .claude/rules/shadow-star-shorthand-autocomplete-marker.md reference resolves on main now (#3339 merged). The reference is preserved in the plist's composes-with comment block. P2 (Codex) — KeepAlive semantics in plist: Dropped `SuccessfulExit=false`. KeepAlive dict keys are OR-combined, so the original combination relaunched on any non-zero exit (incl. config errors). `Crashed=true` alone gives the documented crash-only behavior. Comment added explaining the choice. P2 (Codex) — legacy launchctl load/unload in README: Replaced with the modern `bootstrap`/`bootout` interface (with `gui/$(id -u)` domain target) in install, reload, and uninstall steps. The legacy interface is documented as deprecated and can silently no-op on failure; `bootstrap`/`bootout` return proper exit codes. Verified: - bunx tsc --noEmit clean - markdownlint-cli2 clean on README - plutil -lint OK on both the template and a rendered output - Installer dry-run produces a valid plist Co-Authored-By: Claude <noreply@anthropic.com> * fix(shadow-launchd): close CodeQL TOCTOU race in install-launchagent.ts CodeQL flagged `js/file-system-race` at writeFileSync (line 184) — the existsSync→copyFileSync→writeFileSync sequence had a check-then-use window. Replaced with the standard atomic-rename pattern: - Drop the existsSync(destDir) check (mkdirSync recursive:true is idempotent — the check added a TOCTOU window for no benefit) - Replace existsSync(destPath)+copyFileSync(destPath, backup) with renameSync(destPath, backup) inside try/catch (single syscall; ENOENT means no prior plist, anything else re-thrown) renameSync atop the destination is the documented pattern for "backup-on-overwrite without TOCTOU." Same final state for the caller: backup file is created with the old plist contents (if any existed), and destPath has the new contents. Verified: - bunx tsc --noEmit clean - semgrep --config .semgrep.yml --error: 0 findings locally Co-Authored-By: Claude <noreply@anthropic.com> * shard(tick): 0305Z — #3342 thread close-out (5+1 reviews); #3356 merged Co-Authored-By: Claude <noreply@anthropic.com> * docs(b-0519): add Pattern 7 (abandoned rebase state in shared .git/) Field-test in the 2026-05-15 Otto-CLI session surfaced a contamination mechanism not in the original 6 patterns: a peer agent's mid-interactive- rebase state, left sitting in `.git/rebase-merge/` for hours, can be resumed by another process and detach HEAD on the peer's branch mid-tick. Distinct from Patterns 1-6 (checkout/reset races) because the contaminating event is paused-then-resumed metadata, not a fresh checkout. Branch-guard defense (Pattern 5) caught it. Added: - Pattern 7 section with full forensics + field-test shard pointers (0213Z + 0230Z, both merged via PR #3356) - Cheap mechanization candidate: `tools/hygiene/check-stale-rebase-state.ts` diagnostic that warns on `.git/rebase-merge/` older than 1h - last_updated frontmatter bumped to 2026-05-15 Substrate-honest stance preserved: do not touch peer's rebase state. Pivot to dedicated worktrees; branch refs are global, so work lands on the right ref regardless. Verified: markdownlint clean. Co-Authored-By: Claude <noreply@anthropic.com> * fix(shadow-launchd): address 8 of 10 review-cycle-2 findings Codex + Copilot reviewed the new install-launchagent.ts in detail. This commit addresses the substantive correctness + style findings; unit-test coverage is deferred to a separate backlog row. Addressed (8): P1 [Codex P2 + Copilot P1] — XML-escape substituted values: Paths like `/Users/foo & bar/Zeta` would substitute into <string> text nodes producing an invalid plist (& without entity terminator). New `xmlEscape` helper applies the five XML 1.0 predefined entities (& < > " ') before placeholder substitution. Restores the advertised "handles paths with shell metacharacters" promise — the bug class was XML escaping, not shell escaping. P1 — Unknown args silently ignored: Switch fell through on typos like `--dryrun` or `--bootstap`, then installed with default behavior. Added explicit default: case that errors with the offending flag and exits 1 before any FS action. Verified: `--dryrun` now produces "Unknown argument: --dryrun. Run with --help to see supported flags." P1 — Relative --bun-path / --repo-root overrides: `--repo-root .` would write relative paths into ProgramArguments, WorkingDirectory, and log paths — broken under launchd (which has no cwd unless explicit). New requireAbsolute() helper rejects with a `Use \`<canonicalized>\` if that's what you meant` hint. P1 — Non-atomic backup-then-write: Previous renameSync(destPath, backup) + writeFileSync(destPath) had a window where the agent could be removed but the new plist not yet present (if writeFileSync threw). Replaced with the standard write-temp-then-promote pattern: 1. writeFileSync(destPath.tmp-PID, content) 2. renameSync(destPath, backup) // may not exist; that's OK 3. renameSync(destPath.tmp-PID, destPath) // atomic promote Failure in step 3 restores backup → destPath (best-effort) so the caller's existing install is preserved. P1 — execFileSync can throw before validation: Missing bun, missing git, or running outside a git checkout produced a raw exception. New tryDetect() catches and returns undefined; parseArgs emits the documented actionable error pointing at the --bun-path / --repo-root override. P1 — Unconditional main() invocation: Per Bun-project convention, gate main() with `if (import.meta.main)` so tests / helpers can import the module without triggering filesystem or launchctl side effects. P1 — README/plist cross-refs to .claude/rules/shadow-star-shorthand-*: These resolve on main (PR #3339 merged). CI's merge-ref check confirms; the reviewers' findings were against the raw branch base. No additional action needed. P2 — Direct name attribution in plist KeepAlive comment: Replaced "Per Codex review on PR #3342" with the rationale text only. Current-state surface; uses role-refs only. Deferred (1): P1 — Unit test coverage for install-launchagent.ts: Codex + Copilot called out missing tests for placeholder escaping, missing placeholders, argument validation, and dry-run output. This commit adds the substantive behavior the tests would verify; the tests themselves are deferred to a separate backlog row to keep this PR's scope manageable. Smoke-tested all four behaviors by hand on the cli before commit. Filing as follow-up: tests in `tools/shadow/launchd/install-launchagent.test.ts` using Bun's built-in test runner. Verified: - bunx tsc --noEmit clean on install-launchagent.ts (pre-existing process-extract.ts errors are on this branch base because #3349 isn't rebased in; CI's merge-ref includes the fix) - semgrep --config .semgrep.yml --error: 0 findings - --dry-run produces valid plist (plutil -lint OK) - --dryrun rejected (Unknown argument) - --repo-root . rejected (must be absolute) - Special-char paths (e.g., /Users/foo & bar) now produce valid escaped XML Co-Authored-By: Claude <noreply@anthropic.com> * backlog(p3): B-0528 — unit tests for shadow launchd installer (deferred from PR #3342) PR #3342 review surfaced a P1 finding: no unit tests cover the new install-launchagent.ts's safety-critical placeholder substitution, XML escaping, argument validation, dry-run output, or atomic-promote pattern. The PR's substantive correctness fixes landed in `970c774`; this row tracks the deferred test-coverage work. Scope is bounded (Bun test runner, 6 test categories, follows the existing tools/shadow/shadow-observer.test.ts pattern). Effort: S. P3 because the install script's behavior is now correct (smoke-tested by hand); tests harden against regression rather than fix a current bug. Co-Authored-By: Claude <noreply@anthropic.com> * fix(shadow-launchd): availability-preserving install pattern (Codex review) Codex re-flagged the rename-then-write pattern (in `970c774`) — even with backup-restore on failure, there is a brief window between `renameSync(destPath, backup)` and `renameSync(tmpDest, destPath)` where the canonical path has no plist. If launchd were to load during that window, it would see no agent. Replaced with the availability-preserving pattern: 1. Read existing destPath into memory (skipped on ENOENT) 2. Write new content to a temp file alongside destPath 3. Atomically rename(tmp, destPath) — POSIX replaces in one syscall 4. Side-car the in-memory old content as a timestamped backup The canonical path is NEVER in a missing state. Backup-write happens AFTER the install is in place; if it fails, the install is still good (just no backup). Read-failure handling is similarly defensive: log + proceed without backup rather than aborting the install. Verified: - bunx tsc --noEmit clean on install-launchagent.ts - --dry-run produces valid plist (plutil -lint OK) Co-Authored-By: Claude <noreply@anthropic.com> * fix(shadow-launchd): address review-cycle-3 findings (6 of 7) P1 — Restore SuccessfulExit=false in KeepAlive (reviewer-conflict resolution): Earlier cycle dropped this on Codex review (config errors would loop-restart). This cycle Copilot countered: Bun TypeScript runtime errors exit non-zero rather than signal-terminate, so the previous `Crashed=true` only setting left those failure modes unhandled. Restored both keys with an extended plist comment explaining the trade-off. ThrottleInterval=60s + --dry-run-by-default already cover the "config error restart loop" concern. P1 — Add sonarjs/no-os-command-from-path suppressions: Matches the convention in tools/github/poll-pr-gate.ts + tools/peer-call/. Applied at tryDetect, plutilLint, and the three launchctl bootstrap/bootout calls. Comments cite the precedent. P2 — Export helper functions for testability: `import.meta.main` guard was added in `970c774` but the functions were not exported. Added `export` to main(), parseArgs(), requireAbsolute(), tryDetect(), xmlEscape(), substitutePlaceholders(), plutilLint(), and the Args interface. Unblocks the B-0528 test file. P1 — Update 0305Z tick shard's "PREFER" code snippet: The earlier shard documented the rename-then-write pattern as "PREFER", but that pattern still has a window where destPath is empty. Updated to show 3-pattern progression (AVOID copyFileSync → ALSO AVOID rename-then-write → PREFER write-temp-then-atomic- replace) so the historical trail is accurate and prevents future authors from copying the deprecated pattern. Deferred (1): P1 — Cross-ref findings on README.md:5 + plist:24 + ts:185: README.md:5 and plist:24 reference `.claude/rules/shadow-star-shorthand-autocomplete-marker.md` which IS on main (#3339 merged). The reviewer's check is against the raw branch base; CI's merge-ref check passes. ts:185 is the test coverage finding, already filed as B-0528 (deferred per scope management). Verified: - bunx tsc --noEmit clean on install-launchagent.ts - markdownlint clean on 0305Z.md - plutil -lint OK on template + rendered output - --dry-run produces valid plist Co-Authored-By: Claude <noreply@anthropic.com> * shard(tick): 0329Z — #3342 review-cycle-3 close-out; B-0519 P7 + B-0528 filed Co-Authored-By: Claude <noreply@anthropic.com> * fix(shadow-launchd): reconcile docs+shard+backlog with current plist state Cycle 4 Copilot review caught three documentation surfaces that drifted from the actual implementation when `SuccessfulExit=false` was restored in cycle 3: 1. README.md:13 "Restarts on crash (KeepAlive on Crashed only)" — wrong description of the bullet. Updated to "Restarts on crash AND on non-zero exit (KeepAlive Crashed=true + SuccessfulExit=false) — covers signal-termination AND Bun runtime errors". Added the ThrottleInterval=60s loop-cap context to the next bullet. 2. 0305Z tick shard row 17 + delta row 79 — described the plist as "now crash-only-restart" and showed the After-column as Crashed-only. Both rewritten to reflect the cycle-3 reviewer-conflict resolution: restored both keys with documented trade-off, net same shape as before the PR. 3. B-0528 test-scope item #6 — described atomic-promote with backup- restore on rename failure, but current code uses availability- preserving pattern (read-old-into-memory → write temp → atomic replace → side-car backup). Rewrote the scope with the actual failure modes the tests should cover, including the "destPath never missing during install" invariant. Two remaining unresolved threads (cross-refs to .claude/rules/shadow-star-shorthand-autocomplete-marker.md from README:5 and plist:24) flag a file that IS on main via #3339. The reviewer checks against the branch's diff base, which doesn't include the merged rule. Resolved as outdated on the PR; CI merge-ref check confirms the reference resolves at merge time. Co-Authored-By: Claude <noreply@anthropic.com> * fix(shadow-launchd): tighten path validation + harden tmp-file handling Cycle-4 (post-`59d5c26`) Copilot review surfaced two more correctness findings — both addressed: P1 — --bun-path validation accepts dirs / non-executables: Previous `existsSync(bunPath)` would pass `/tmp` or `~/Downloads/bun` (non-executable copy) and write a LaunchAgent that can't start. Replaced with `statSync` + `isFile()` + `accessSync(X_OK)` so the installer refuses non-executable / non-regular-file overrides pre-write. New error paths: - "exists but is not a regular file" (e.g., --bun-path /tmp) - "is not executable by the current user" (chmod hint) --repo-root similarly gated to require an existing directory. Verified both error paths by hand. P1 — Predictable /tmp filename in plutilLint (symlink attack): Previous `/tmp/zeta-shadow-launchagent-${PID}.plist` had a predictable name in a world-writable directory. A pre-created symlink at that path would cause writeFileSync to follow the link and clobber a file the attacker has write access to but not the current user. Replaced with `mkdtempSync(tmpdir() + "zeta-shadow- launchagent-")` which creates a 0700 directory with a random suffix — symlink-resistant, and we clean up both the candidate file and the directory in a `finally` block so we don't leak. Threads remaining after this push (auto-resolution candidates): - Test coverage P1 (5th time flagged): already filed as B-0528 with rationale. Will reply on the thread. - Cross-refs to .claude/rules/shadow-star-shorthand-* (5th time flagged): file IS on main via #3339. CI merge-ref check confirms. Will resolve as outdated. Verified: - bunx tsc --noEmit clean on install-launchagent.ts - --dry-run produces valid plist - --bun-path /tmp rejected as "not a regular file" - --bun-path <non-executable> rejected as "not executable" Co-Authored-By: Claude <noreply@anthropic.com> * shard(tick): 0543Z — #3342 review-cycles 4+5 close-out (9 more findings) Co-Authored-By: Claude <noreply@anthropic.com> --------- Co-authored-by: Claude <noreply@anthropic.com>
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Codex P2 catch: the relative link to .claude/rules/substrate-or-it- didnt-happen.md was off by one directory level. From the shard location (docs/hygiene-history/ticks/2026/05/15/0615Z.md), reaching .claude/rules/ requires 6x ../ to climb out of hygiene-history/ up to repo root. The 5x version resolved to docs/.claude/... (a path that doesn't exist), making the cited policy unreachable from the audit trail it was supposed to support. Same class as the 0027Z + 0230Z shard link-depth fixes earlier today (PRs #3330 + #3356). The pattern recurs because: - 4x ../ → docs/ (correct for docs/backlog/, docs/research/, etc.) - 5x ../ → repo root one level off (off-by-one mistake site) - 6x ../ → repo root (correct for .claude/, src/, etc.) Verified by `ls -la` resolution check from the shard directory. Co-Authored-By: Claude <noreply@anthropic.com>
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…-Otto-CLI self-contention) (#3370) * shard(tick): 0615Z — worktree-prune-race root cause identified (multi-Otto-CLI self-contention); substrate recovered to git after 3 tick-shards lived in bus envelopes only Recovers the 0545Z + 0607Z + 0611Z investigation arc into a single canonical shard. Bus envelopes 111342b2, 6de98fac, 720a2b49 were the substrate-landing channel during the 30 minutes I could not commit to git. Branch shard/0545z-... was created locally at 0545Z but the worktree-add rollback prevented any worktree from surviving long enough to commit. This tick the contention window cleared (peer Otto-CLI PID 7894's stuck git reset --hard finally exited; PID 11725's git worktree add also cleaned up) and a fresh `git worktree add` succeeded on the first try. Co-Authored-By: Claude <noreply@anthropic.com> * fix(shard-0615Z): reframe bus as bridge channel, not substrate Codex P2 catch on line 56: framing "/tmp/zeta-bus IS the substrate channel" normalizes ephemeral state as durable substrate, contradicting .claude/rules/substrate-or-it-didnt-happen.md (TaskUpdate / /tmp / loop-todos are NOT durable substrate). Reframed: bus envelopes are the BRIDGE CHANNEL between outage start and git recovery. The substrate-honest sequence is outage → bus- captured → git-preserved (which is what actually happened). Bus is not a substitute for git-canonical landing; it is a bridge that preserves evidence until git is reachable. Co-Authored-By: Claude <noreply@anthropic.com> * docs(b-0519): add Pattern 8 (multi-Otto-CLI cron-tick concurrency) Cross-references B-0530 (filed 2026-05-15, merged in PR #3372) as the mechanization row for the multi-Otto-CLI self-contention pattern identified in this PR's root-cause analysis. Composes the mechanization candidate sketch ("pgrep claude-code at top of autonomous-loop, defer if peer detected") with the existing Patterns 1-7 family. Pattern 8 is distinct because: - Patterns 1-6 are checkout/reset races (peer git changes HEAD) - Pattern 7 is paused-then-resumed rebase state - Pattern 8 is concurrent git worktree add operations contending on .git/objects/pack via "Interrupted system call" All three families share the same underlying cause (shared .git/ directory across multiple processes/sessions) but the surface mechanism + the catch + the mitigation differ. Co-Authored-By: Claude <noreply@anthropic.com> * fix(shard-0615Z): correct substrate-rule link depth (5x → 6x ../) Codex P2 catch: the relative link to .claude/rules/substrate-or-it- didnt-happen.md was off by one directory level. From the shard location (docs/hygiene-history/ticks/2026/05/15/0615Z.md), reaching .claude/rules/ requires 6x ../ to climb out of hygiene-history/ up to repo root. The 5x version resolved to docs/.claude/... (a path that doesn't exist), making the cited policy unreachable from the audit trail it was supposed to support. Same class as the 0027Z + 0230Z shard link-depth fixes earlier today (PRs #3330 + #3356). The pattern recurs because: - 4x ../ → docs/ (correct for docs/backlog/, docs/research/, etc.) - 5x ../ → repo root one level off (off-by-one mistake site) - 6x ../ → repo root (correct for .claude/, src/, etc.) Verified by `ls -la` resolution check from the shard directory. Co-Authored-By: Claude <noreply@anthropic.com> --------- Co-authored-by: Claude <noreply@anthropic.com>
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Summary
Tick shard for 0230Z UTC, missed the auto-merge squash of #3349 (auto-merge fired off the lagged PR head before my late push of the shard commit became the PR head). Recording on its own to keep the substrate trail complete.
Captures:
lint (markdownlint)MD049 fixed across 3 commits on the branch. Merged atd1ee546.--platformruntime validation) in82cb97c. Merged at1e05167..git/HEADflipped from my branch ref to detached65c7865(a Lior rebase resumed in shared.git/). Branch-guard would have caught any bad commit. Pivoted to dedicated worktrees per .claude/rules/claim-acquire-before-worktree-work.md §"Worktree force-remove guard".Test plan
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