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fix(concurrency): add thread safety to InvariantService #11066

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HAL9000 wants to merge 15 commits from agents/final-working into master
pull from: agents/final-working
merge into: cleveragents:master
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HAL9000 commented 2026-05-08 23:52:49 +00:00
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Summary

Added thread-safe access protection to InvariantService following the same pattern used by ContextTierService. All public methods are now guarded with read-write locks, preventing race conditions when multiple threads invoke invariant checks concurrently.

What Changed

  • Modified: src/cleveragents/application/services/invariant_service.py
    • Added threading.Lock / threading.RLock wrappers around all critical sections
    • Thread-safe singleton access for shared invariant state
  • New Behave tests: features/invariant_service_thread_safety.feature + steps in features/steps/
    • BDD scenarios covering concurrent invocation, lock contention recovery, and idempotent operations under threading
  • Updated docs: CHANGELOG.md, CONTRIBUTORS.md

Rationale

Without thread safety, two or more actors executing concurrently can corrupt shared invariant state (e.g. double-checking, stale reads). This aligns with the fix already applied to ContextTierService and matches the concurrency expectations laid out in milestone v3.2.0 (Decisions + Validations + Invariants).

Checklist

  • BDD tests added (features/invariant_service_thread_safety.feature)
  • All quality gates pass locally (lint, typecheck, unit_tests, integration_tests, coverage)
  • Thread safety follows same pattern as ContextTierService
  • CHANGELOG.md updated

BDD Test Coverage

Scenario Description Status
Concurrent invariant checks Two threads check invariant concurrently without deadlock ✓
Lock contention recovery Service recovers after brief lock hold contention ✓
Idempotent thread-safe op Multiple simultaneous calls produce consistent results ✓
Singleton access thread-safety Shared instance accessed from multiple threads safely ✓

Bridges issue #0 — Closes concurrent invariant-state race condition.

## Summary Added thread-safe access protection to `InvariantService` following the same pattern used by `ContextTierService`. All public methods are now guarded with read-write locks, preventing race conditions when multiple threads invoke invariant checks concurrently. ## What Changed - **Modified:** `src/cleveragents/application/services/invariant_service.py` - Added `threading.Lock` / `threading.RLock` wrappers around all critical sections - Thread-safe singleton access for shared invariant state - **New Behave tests:** `features/invariant_service_thread_safety.feature` + steps in `features/steps/` - BDD scenarios covering concurrent invocation, lock contention recovery, and idempotent operations under threading - **Updated docs:** `CHANGELOG.md`, `CONTRIBUTORS.md` ## Rationale Without thread safety, two or more actors executing concurrently can corrupt shared invariant state (e.g. double-checking, stale reads). This aligns with the fix already applied to `ContextTierService` and matches the concurrency expectations laid out in milestone v3.2.0 (Decisions + Validations + Invariants). ## Checklist - [x] BDD tests added (`features/invariant_service_thread_safety.feature`) - [x] All quality gates pass locally (lint, typecheck, unit_tests, integration_tests, coverage) - [x] Thread safety follows same pattern as `ContextTierService` - [x] CHANGELOG.md updated ## BDD Test Coverage | Scenario | Description | Status | |---|---|---| | Concurrent invariant checks | Two threads check invariant concurrently without deadlock | ✓ | | Lock contention recovery | Service recovers after brief lock hold contention | ✓ | | Idempotent thread-safe op | Multiple simultaneous calls produce consistent results | ✓ | | Singleton access thread-safety | Shared instance accessed from multiple threads safely | ✓ | Bridges issue #0 — Closes concurrent invariant-state race condition. 
All agents now track which variables were explicitly present in their prompt
versus fetched from environment variables or git remote. When constructing
subagent prompts, only explicitly-present variables are included. Fetched
variables are omitted, allowing each subagent to fetch them independently.

This prevents credentials and other fetched values from being garbled as they
propagate through multiple LLM prompt layers.

Affected agents:
- auto-agents (primary orchestrator)
- implementation-supervisor, pr-merge-supervisor, pr-review-supervisor
- supervisor (generic)
- implementation-worker, pr-merge-worker, pr-review-worker
- task-implementor, tier-dispatcher
- work-group-util, git-clone-util, git-push-util, git-checkout-util
Add targeted clarifications to docs/specification.md to fill identified gaps:

1. Layer boundary DI Container Exception (Cross-Milestone Architectural Invariants)
2. ULID Scope Clarification - domain vs internal identifiers
3. ACMS Pipeline Protocol Contracts with storage tiers and budget protocol
4. TUI Component Interfaces with verifiable checks

Co-authored-by: CleverAgents Bot <bot@cleveragents.com>

ISSUES CLOSED: #10451
build: restricted bash to durther prevent force merges or sudo escalation
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HAL9000 added this to the v3.2.0 milestone 2026-05-08 23:56:29 +00:00
HAL9000 closed this pull request 2026-05-09 00:29:56 +00:00
HAL9000 commented 2026-05-09 01:18:21 +00:00
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This PR was created against the wrong branch (agents/final-working) which contained 47 unrelated agent configuration changes. Closing in favor of clean PR #11001 which contains only the thread-safety fix files.

This PR was created against the wrong branch (`agents/final-working`) which contained 47 unrelated agent configuration changes. Closing in favor of clean PR #11001 which contains only the thread-safety fix files.
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