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feat: add Agent Attention playground experiment - #1

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codex/agent-attention-experiment
Aug 12, 2026
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myagentdojo merged 25 commits into
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codex/agent-attention-experiment

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@myagentdojo

@myagentdojo myagentdojo commented Aug 10, 2026 •

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Outcome

Move the proven Agent Attention source, thin skill, native adapter, and focused tests into the private v0.3-derived plugin playground as its first active experiment.

Boundaries

  • Keeps the experiment outside the installable plugin/ payload.
  • Adds no plugin installation or release claim.
  • Performs no Apple Reminders read or mutation.
  • Preserves explicit yes/no admission, exact task/meaning binding, one-time delivery, duplicate suppression, no nags, retained receipts, and structured-state-only Stop enforcement.

Proof

  • Agent Attention focused tests: 29 passed.
  • Hook coverage: 100% functions, 91.49% lines.
  • bun run generate:check: passed.
  • bun run build: passed.
  • bun run release:validate: passed.
  • bun run prove:all: passed at 9d564faa6ab404253cf13703698a909a680ea7e2.
  • Independent multi-lens review completed; validated blockers fixed.

Deferred

Plugin activation, installation, release, live Reminders smoke, and persistent 15-second background qualification remain separate approval-gated units.

Summary by CodeRabbit

  • New Features
    • Added Agent Attention approval workflows using Apple Reminders, including submission, polling, delivery tracking, and outcome recording.
    • Added stop checks to prevent premature task completion when approval or verification remains outstanding.
    • Added macOS link handling to open related Codex threads.
  • Documentation
    • Added setup, usage, workflow, and troubleshooting guidance for Agent Attention.
  • Tests
    • Added comprehensive coverage for approval, delivery, recovery, concurrency, and stop-hook behavior.
  • Chores
    • Renamed the product and marketplace identity to Agent Plugin Playground.
    • Updated release configuration and package metadata for the new product identity.

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📥 Commits

Reviewing files that changed from the base of the PR and between 9abd4c2 and 5755fd4.

📒 Files selected for processing (2)
  • experiments/agent-attention/runtime/agent-attention/agent-attention.py
  • experiments/agent-attention/runtime/agent-attention/test_agent_attention.py
🚧 Files skipped from review as they are similar to previous changes (1)
  • experiments/agent-attention/runtime/agent-attention/agent-attention.py

📝 Walkthrough

Walkthrough

The PR adds the Agent Attention approval-gate experiment, including a Python CLI, Codex Stop hook, Apple Reminders integration, macOS URL handler, tests, and documentation. It also renames plugin metadata and resets release metadata for version 0.1.0.

Changes

Agent Attention experiment and plugin rebrand

Layer / File(s) Summary
Plugin identity and release metadata
.agents/plugins/marketplace.json, .claude-plugin/marketplace.json, .github/*, package.json, plugin.config.json, plugin/.claude-plugin/plugin.json, plugin/.codex-plugin/plugin.json, plugin/hooks/fixture/*, scripts/*
Plugin and marketplace metadata now use agent-plugin-playground and version 0.1.0. Release configuration, canary setup, and identity tests use the renamed package.
Approval admission and reminder gate
experiments/agent-attention/runtime/agent-attention/agent-attention.py, experiments/agent-attention/skill/SKILL.md
The Python CLI validates approval intents, manages thread state, suppresses duplicate gates, creates and verifies Apple Reminders, and records gate mappings.
Approval lifecycle and stop state
experiments/agent-attention/runtime/agent-attention/agent-attention.py, experiments/agent-attention/runtime/agent-attention/README.md
The runtime polls and watches reminders, validates delivery and outcomes, records terminal state, evaluates stop conditions, and exposes diagnostics and command dispatch.
Codex Stop and URL integrations
experiments/agent-attention/hooks/*, experiments/agent-attention/runtime/agent-attention/link-handler/*, experiments/agent-attention/runtime/agent-attention/install-link-handler.sh, experiments/agent-attention/README.md
The Bun Stop hook calls the Python owner and emits allow or block decisions. The macOS handler validates agent-attention://threads/<UUID> URLs and opens matching Codex threads.
Runtime contract validation
experiments/agent-attention/runtime/agent-attention/test_agent_attention.py, experiments/agent-attention/hooks/agent-attention-codex-stop.test.ts
Tests cover CLI contracts, idempotency, concurrency claims, repair states, delivery and outcome validation, bounded watching, deleted reminders, malformed Stop payloads, owner failures, and recursion prevention.

Estimated code review effort: 5 (Critical) | ~120 minutes

Sequence Diagram(s)

sequenceDiagram
  participant Agent
  participant CLI as agent-attention.py
  participant Reminders as Apple Reminders
  participant StopHook as Codex Stop hook
  participant Codex
  Agent->>CLI: submit approval intent
  CLI->>Reminders: create and verify approval reminder
  Reminders-->>CLI: report completed approval
  CLI->>CLI: record delivery and terminal outcome
  Codex->>StopHook: send Stop payload
  StopHook->>CLI: check_stop(session_id)
  CLI-->>StopHook: return allow or continue
  StopHook-->>Codex: emit stop decision
Loading

Possibly related PRs

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name Status Explanation Resolution
Docstring Coverage ⚠️ Warning Docstring coverage is 53.01% which is insufficient. The required threshold is 80.00%. Write docstrings for the functions missing them to satisfy the coverage threshold.
✅ Passed checks (4 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The title clearly summarizes the main change: adding the Agent Attention playground experiment.
Linked Issues check ✅ Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check ✅ Passed Check skipped because no linked issues were found for this pull request.
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  • Commit unit tests in branch codex/agent-attention-experiment

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Actionable comments posted: 6

🧹 Nitpick comments (8)
experiments/agent-attention/skill/SKILL.md (1)

27-28: 📐 Maintainability & Code Quality | 🔵 Trivial | 💤 Low value

Name the outcome command explicitly.

Steps 1 through 3 name submit directly. Step 6 says "the owner's outcome command" instead. Name record-outcome so the agent does not need to rediscover it, and state that it previews by default.

♻️ Proposed wording
 6. After exact-task delivery, apply only the stated approval meaning, run the
-   continuation, then use the owner’s outcome command.
+   continuation, then preview `record-outcome` and rerun it with `--execute`.
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@experiments/agent-attention/skill/SKILL.md` around lines 27 - 28, Update step
6 in the skill instructions to explicitly name the owner’s outcome command as
record-outcome, and state that it previews by default while preserving the
existing sequence and approval meaning.
experiments/agent-attention/runtime/agent-attention/test_agent_attention.py (1)

154-155: 📐 Maintainability & Code Quality | 🔵 Trivial | ⚡ Quick win

Make the fake remindctl fail on unknown subcommands.

The else branch answers every unrecognized subcommand with the doctor authorization payload. If the runtime ever calls a wrong or renamed subcommand, the fake still returns parseable JSON and the test passes. That hides the regression.

Match doctor explicitly and exit non-zero for anything else.

💚 Proposed fix
-else:
-    print(json.dumps({"authorization": {"authorized": True}}))
+elif args[0] == "doctor":
+    print(json.dumps({"authorization": {"authorized": True}}))
+else:
+    print("unsupported remindctl subcommand: " + args[0], file=sys.stderr)
+    raise SystemExit(2)
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@experiments/agent-attention/runtime/agent-attention/test_agent_attention.py`
around lines 154 - 155, Update the fake remindctl command handler around the
existing else branch to match the doctor subcommand explicitly and return its
authorization JSON only for that command. For every other unrecognized
subcommand, exit with a non-zero status instead of emitting a successful
payload.
experiments/agent-attention/runtime/agent-attention/install-link-handler.sh (1)

9-16: 📐 Maintainability & Code Quality | 🔵 Trivial | ⚡ Quick win

Add a preflight check for swiftc and lsregister.

The script depends on swiftc, which ships with Xcode or the Command Line Tools, and on lsregister at the hard-coded path in Line 9. If either is absent, set -e aborts with a raw shell or compiler error. Every other command in this experiment returns one structured JSON result, so the failure mode here is inconsistent and harder to act on.

Check both before you build.

♻️ Proposed change
+if ! command -v swiftc >/dev/null 2>&1; then
+  printf '{"status":"error","repair":"install Xcode Command Line Tools to provide swiftc"}\n' >&2
+  exit 1
+fi
+if [[ ! -x "$register_bin" ]]; then
+  printf '{"status":"error","repair":"lsregister is not available at the expected LaunchServices path"}\n' >&2
+  exit 1
+fi
+
 mkdir -p "$macos_dir"
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@experiments/agent-attention/runtime/agent-attention/install-link-handler.sh`
around lines 9 - 16, Add a preflight validation before the build commands in
install-link-handler.sh: verify that swiftc is available and that the
register_bin path for lsregister exists and is executable. If either dependency
is missing, emit the script’s structured JSON failure result and exit before
mkdir, compilation, or registration; preserve the existing successful
installation output.
experiments/agent-attention/runtime/agent-attention/agent-attention.py (3)

55-66: 🗄️ Data Integrity & Integration | 🔵 Trivial | ⚡ Quick win

Consider a temp-file plus rename write for state durability.

write_json opens the target with O_TRUNC and writes in place. If the process stops between truncation and the final write, the state file stays truncated and later load_json calls fail on invalid JSON. Gate custody state (requests/, gates/, receipts/) then needs manual repair.

The exclusive-create path must stay as is, because it provides the claim semantics. Only the non-exclusive path needs the rename.

♻️ Proposed durable write for the non-exclusive path
 def write_json(path: Path, value: Any, *, exclusive: bool = False) -> bool:
 	"""Write private JSON atomically enough for single-host gate custody."""
 	path.parent.mkdir(parents=True, exist_ok=True, mode=0o700)
-	flags = os.O_WRONLY | os.O_CREAT | (os.O_EXCL if exclusive else os.O_TRUNC)
-	try:
-		descriptor = os.open(path, flags, 0o600)
-	except FileExistsError:
-		return False
-	with os.fdopen(descriptor, "w", encoding="utf-8") as handle:
-		json.dump(value, handle, sort_keys=True)
-		handle.write("\n")
-	return True
+	if exclusive:
+		try:
+			descriptor = os.open(path, os.O_WRONLY | os.O_CREAT | os.O_EXCL, 0o600)
+		except FileExistsError:
+			return False
+		with os.fdopen(descriptor, "w", encoding="utf-8") as handle:
+			json.dump(value, handle, sort_keys=True)
+			handle.write("\n")
+		return True
+	temporary = path.with_name(f"{path.name}.{os.getpid()}.tmp")
+	descriptor = os.open(temporary, os.O_WRONLY | os.O_CREAT | os.O_TRUNC, 0o600)
+	with os.fdopen(descriptor, "w", encoding="utf-8") as handle:
+		json.dump(value, handle, sort_keys=True)
+		handle.write("\n")
+		handle.flush()
+		os.fsync(handle.fileno())
+	os.replace(temporary, path)
+	return True
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@experiments/agent-attention/runtime/agent-attention/agent-attention.py`
around lines 55 - 66, Update write_json so only non-exclusive writes use a
uniquely named temporary file in the target directory, write and close the JSON
there, then atomically replace the target via rename. Preserve the existing
O_EXCL creation path and its FileExistsError behavior unchanged, and clean up
temporary files when non-exclusive writes fail.

1004-1008: 📐 Maintainability & Code Quality | 🔵 Trivial | ⚡ Quick win

Reuse append_audit here.

append_audit at Line 69 already performs the same directory creation, append, and chmod sequence. record_outcome calls it at Line 780 and Line 839. Use it here so one function owns audit file permissions.

♻️ Proposed refactor
-	log_path = state_dir / "audit.jsonl"
-	log_path.parent.mkdir(parents=True, exist_ok=True, mode=0o700)
-	with log_path.open("a", encoding="utf-8") as handle:
-		handle.write(json.dumps(receipt, sort_keys=True) + "\n")
-	os.chmod(log_path, 0o600)
+	append_audit(state_dir / "audit.jsonl", receipt)
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@experiments/agent-attention/runtime/agent-attention/agent-attention.py`
around lines 1004 - 1008, Update record_outcome to call the existing
append_audit helper instead of manually creating the audit directory, appending
JSON, and changing permissions. Pass the existing log_path and receipt values so
append_audit remains the single owner of audit file handling and permissions.

148-158: 📐 Maintainability & Code Quality | 🔵 Trivial | 💤 Low value

Remove the unused gate_notes helper. No repository call site references it. submit_approval uses router_notes instead. Keep it only if external callers rely on it.

🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@experiments/agent-attention/runtime/agent-attention/agent-attention.py`
around lines 148 - 158, Remove the unused gate_notes helper and its associated
formatting logic. Keep submit_approval and its router_notes flow unchanged,
unless repository-wide evidence shows external callers depend on gate_notes.
experiments/agent-attention/hooks/agent-attention-codex-stop.test.ts (1)

100-115: 📐 Maintainability & Code Quality | 🔵 Trivial | 💤 Low value

This test requires python3 on PATH.

The test calls handleAgentAttentionStop without a runtime, so it uses createDefaultRuntime and spawns python3. handleAgentAttentionStop does not catch owner errors; only runAgentAttentionStop does. If python3 is absent, the test fails with a spawn error rather than a clear message about the missing dependency.

State the dependency in the test name, or assert the failure mode explicitly so the cause is obvious.

🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@experiments/agent-attention/hooks/agent-attention-codex-stop.test.ts` around
lines 100 - 115, Update the test name around handleAgentAttentionStop to
explicitly state that it requires python3 on PATH, or change the test to assert
the expected missing-dependency failure. Ensure the test clearly communicates
the runtime dependency instead of allowing an unhandled spawn error to obscure
the cause.
experiments/agent-attention/hooks/agent-attention-codex-stop.ts (1)

134-142: 🩺 Stability & Availability | 🔵 Trivial | ⚡ Quick win

Add a spawn-level timeout to the owner check.

Set timeout to 5000 milliseconds. This is below the Codex hook timeout of 10 seconds and keeps a hung python3 process inside the adapter, where runAgentAttentionStop can return a block response.

♻️ Proposed change
 			const process = Bun.spawn(
 				['python3', owner, 'check-stop', '--thread-id', threadId],
-				{ stdout: 'pipe', stderr: 'pipe' },
+				{ stdout: 'pipe', stderr: 'pipe', timeout: 5000 },
 			)
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@experiments/agent-attention/hooks/agent-attention-codex-stop.ts` around lines
134 - 142, Update the Bun.spawn options in the owner-check flow of
runAgentAttentionStop to include a 5000-millisecond timeout, ensuring a hung
python3 process terminates within the adapter while preserving the existing
stdout, stderr, and exit-code handling.
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@experiments/agent-attention/runtime/agent-attention/agent-attention.py`:
- Around line 868-886: Update the mapping-processing loop around event_id and
the reminder validation checks so an unresolved, mismatched-title, or
missing-required-notes reminder records repair state for that mapping, includes
its reminder ID in the error details, and continues to the next mapping instead
of raising out of the poll. Preserve the refusal to infer approval and the
existing handling for completed reminders.
- Around line 350-392: Update submit_approval so all paths that do not leave a
live gate release request_lock_path. Wrap the request-processing body after
exclusive lock creation in try/finally, unlinking the lock in finally; remove
the existing success/idempotent-path unlink calls so cleanup is centralized and
also covers request-claim collisions and every ContractError.
- Around line 637-648: Validate reminder_id at the start of read_gate_mapping
before constructing the gates path, reusing the existing validate_event_id shape
check used by record_delivery. Reject invalid or path-like IDs while preserving
normal mapping loading and validation for valid IDs, including the downstream
remindctl edit flow.
- Around line 1081-1101: Update the doctor flow around run_json to pass an
appropriate timeout_seconds value when invoking remindctl doctor. Validate that
reminders is a dictionary before accessing it; for any other JSON shape, raise
the established ContractError so main emits a structured result instead of a
traceback. Use the validated reminders["authorization"]["authorized"] value when
computing ready, preserving the existing config and handler checks.

In `@experiments/agent-attention/runtime/agent-attention/test_agent_attention.py`:
- Around line 663-675: Adjust the elapsed-time assertion in
test_watch_bounds_a_hung_remindctl_call so it remains clearly below the
configured 2-second fake remindctl hang while allowing additional subprocess
startup and teardown time. Keep the existing return-code and
bounded-execution-window assertions unchanged.
- Line 305: Update the read-only preview assertion in the relevant test method
to reload the inventory from self.inventory_path after the CLI subprocess
completes, then assert that the persisted target notes do not contain
"Outcome:". Do not assert against self.target, since the subprocess cannot
mutate that in-memory fixture.

---

Nitpick comments:
In `@experiments/agent-attention/hooks/agent-attention-codex-stop.test.ts`:
- Around line 100-115: Update the test name around handleAgentAttentionStop to
explicitly state that it requires python3 on PATH, or change the test to assert
the expected missing-dependency failure. Ensure the test clearly communicates
the runtime dependency instead of allowing an unhandled spawn error to obscure
the cause.

In `@experiments/agent-attention/hooks/agent-attention-codex-stop.ts`:
- Around line 134-142: Update the Bun.spawn options in the owner-check flow of
runAgentAttentionStop to include a 5000-millisecond timeout, ensuring a hung
python3 process terminates within the adapter while preserving the existing
stdout, stderr, and exit-code handling.

In `@experiments/agent-attention/runtime/agent-attention/agent-attention.py`:
- Around line 55-66: Update write_json so only non-exclusive writes use a
uniquely named temporary file in the target directory, write and close the JSON
there, then atomically replace the target via rename. Preserve the existing
O_EXCL creation path and its FileExistsError behavior unchanged, and clean up
temporary files when non-exclusive writes fail.
- Around line 1004-1008: Update record_outcome to call the existing append_audit
helper instead of manually creating the audit directory, appending JSON, and
changing permissions. Pass the existing log_path and receipt values so
append_audit remains the single owner of audit file handling and permissions.
- Around line 148-158: Remove the unused gate_notes helper and its associated
formatting logic. Keep submit_approval and its router_notes flow unchanged,
unless repository-wide evidence shows external callers depend on gate_notes.

In `@experiments/agent-attention/runtime/agent-attention/install-link-handler.sh`:
- Around line 9-16: Add a preflight validation before the build commands in
install-link-handler.sh: verify that swiftc is available and that the
register_bin path for lsregister exists and is executable. If either dependency
is missing, emit the script’s structured JSON failure result and exit before
mkdir, compilation, or registration; preserve the existing successful
installation output.

In `@experiments/agent-attention/runtime/agent-attention/test_agent_attention.py`:
- Around line 154-155: Update the fake remindctl command handler around the
existing else branch to match the doctor subcommand explicitly and return its
authorization JSON only for that command. For every other unrecognized
subcommand, exit with a non-zero status instead of emitting a successful
payload.

In `@experiments/agent-attention/skill/SKILL.md`:
- Around line 27-28: Update step 6 in the skill instructions to explicitly name
the owner’s outcome command as record-outcome, and state that it previews by
default while preserving the existing sequence and approval meaning.
🪄 Autofix

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  • Push a commit to this branch (recommended)
  • Create a new PR with the fixes

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Review profile: CHILL

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Run ID: 70f14b62-b58a-43bc-93aa-9566a53ff98c

📥 Commits

Reviewing files that changed from the base of the PR and between 8a5447b and f909620.

⛔ Files ignored due to path filters (1)
  • plugin/hooks/fixture/lifecycle-mechanics-proof.generated.json is excluded by !**/*.generated.*
📒 Files selected for processing (24)
  • .agents/plugins/marketplace.json
  • .claude-plugin/marketplace.json
  • .github/.release-please-manifest.json
  • .github/release-please-config.json
  • CHANGELOG.md
  • experiments/agent-attention/README.md
  • experiments/agent-attention/hooks/agent-attention-codex-stop.test.ts
  • experiments/agent-attention/hooks/agent-attention-codex-stop.ts
  • experiments/agent-attention/hooks/codex-hooks.fixture.json
  • experiments/agent-attention/runtime/agent-attention/README.md
  • experiments/agent-attention/runtime/agent-attention/agent-attention.py
  • experiments/agent-attention/runtime/agent-attention/install-link-handler.sh
  • experiments/agent-attention/runtime/agent-attention/link-handler/Info.plist
  • experiments/agent-attention/runtime/agent-attention/link-handler/main.swift
  • experiments/agent-attention/runtime/agent-attention/test_agent_attention.py
  • experiments/agent-attention/skill/SKILL.md
  • package.json
  • plugin.config.json
  • plugin/.claude-plugin/plugin.json
  • plugin/.codex-plugin/plugin.json
  • plugin/hooks/fixture/lifecycle-mechanics-proof.source.json
  • scripts/native-capability-hook.test.ts
  • scripts/native-capability-surface.test.ts
  • scripts/prove-harness-install.test.ts
💤 Files with no reviewable changes (1)
  • CHANGELOG.md

Comment thread experiments/agent-attention/runtime/agent-attention/agent-attention.py Outdated
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Comment thread experiments/agent-attention/runtime/agent-attention/agent-attention.py Outdated
Comment thread experiments/agent-attention/runtime/agent-attention/test_agent_attention.py Outdated
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💡 Codex Review

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Reviewed commit: 17415f9add

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💡 Codex Review

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Reviewed commit: dd78ce2cab

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- validate created reminder IDs before mapping writes
- preserve structured repair state for invalid IDs
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or state.get("thread_id") != mapping["thread_id"]
):
return
write_json(

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P1 Badge Serialize declared-state reconciliation

When two pollers reconcile a crash-left declared request, one can read declared here, pause while the other advances the request through gated and record-outcome writes completed, and then overwrite that terminal state with its stale gated snapshot. The fresh evidence beyond the earlier serialized-updater fix is that this reconciliation write bypasses update_request_state and the per-thread flock entirely; perform the status check and transition under the same locked, monotonic update path.

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Comment on lines +426 to +429
descriptor = acquire_request_lock(
lock_path,
{"thread_id": mapping["thread_id"], "operation": "update-request-state"},
blocking=True,

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P1 Badge Keep the lock inode stable for blocking waiters

When an updater blocks here behind a held lock, it retains a descriptor for the current inode, but release_request_lock() unlinks that inode before unlocking it. A later updater can therefore create and lock a replacement file while the waiter acquires the now-unlinked old inode, allowing both request-state updates to run concurrently and reintroducing the completed-to-delivered regression this lock is intended to prevent. The fresh evidence beyond the earlier serialization fix is the new blocking use of the existing unlink-on-release lock; keep a persistent lock path or revalidate the inode after acquisition.

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myagentdojo merged commit 9113268 into main Aug 12, 2026
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