Proposal [AUTO-SPEC]: Document context tier thread-safety model (threading.RLock) in specification #9859

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opened 2026-04-15 19:21:04 +00:00 by HAL9000 · 0 comments

HAL9000 commented

2026-04-15 19:21:04 +00:00

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Discrepancy Report

Type: Implementation found a better/more complete approach → spec update needed

Area: ACMS — Context Tier Architecture

Current Spec State

The specification describes the ACMS context tier architecture (hot/warm/cold storage tiers) with operations for reading, writing, and evicting context data. However, the spec does not document the thread-safety model used for tier mutations.

The spec currently describes tier operations without mentioning concurrency guarantees or locking semantics.

Implementation State

The implementation uses threading.RLock (reentrant lock) for all tier mutations to ensure thread-safe access to context tiers. This is a deliberate design decision that provides:

Reentrant locking: The same thread can acquire the lock multiple times without deadlocking
Mutual exclusion: Only one thread can mutate a tier at a time
Consistency guarantees: Reads and writes to tier data are serialized

Source: src/cleveragents/infrastructure/acms/context_tier.py — ContextTier class uses threading.RLock for all read(), write(), and evict() operations.

Proposed Spec Change

Update the §ACMS Context Tier Architecture section to document the thread-safety model:

Add a "Thread Safety" subsection to the Context Tier documentation stating:
- All tier mutations are protected by a reentrant lock (threading.RLock)
- Concurrent reads and writes are serialized at the tier level
- The reentrant lock allows the same thread to acquire the lock multiple times (e.g., during recursive operations)
- This guarantees consistency when multiple agents or background tasks access the same context tier concurrently
Document the concurrency contract:
- ContextTier.read() — acquires lock, reads data, releases lock
- ContextTier.write() — acquires lock, writes data, releases lock
- ContextTier.evict() — acquires lock, removes data, releases lock

Classification

Implementation found a better approach — the implementation provides explicit thread-safety guarantees that the spec should document. This is not a deviation from spec intent; it's a more complete specification of the concurrency model.

Acceptance Criteria

docs/specification.md documents the thread-safety model for context tiers
The documentation specifies that threading.RLock is used for tier mutations
The concurrency contract for read(), write(), and evict() operations is documented
The documentation is placed in the §ACMS Context Tier Architecture section

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## Discrepancy Report **Type**: Implementation found a better/more complete approach → spec update needed **Area**: ACMS — Context Tier Architecture ### Current Spec State The specification describes the ACMS context tier architecture (hot/warm/cold storage tiers) with operations for reading, writing, and evicting context data. However, the spec does not document the thread-safety model used for tier mutations. The spec currently describes tier operations without mentioning concurrency guarantees or locking semantics. ### Implementation State The implementation uses `threading.RLock` (reentrant lock) for all tier mutations to ensure thread-safe access to context tiers. This is a deliberate design decision that provides: 1. **Reentrant locking**: The same thread can acquire the lock multiple times without deadlocking 2. **Mutual exclusion**: Only one thread can mutate a tier at a time 3. **Consistency guarantees**: Reads and writes to tier data are serialized Source: `src/cleveragents/infrastructure/acms/context_tier.py` — `ContextTier` class uses `threading.RLock` for all `read()`, `write()`, and `evict()` operations. ### Proposed Spec Change Update the §ACMS Context Tier Architecture section to document the thread-safety model: 1. Add a "Thread Safety" subsection to the Context Tier documentation stating: - All tier mutations are protected by a reentrant lock (`threading.RLock`) - Concurrent reads and writes are serialized at the tier level - The reentrant lock allows the same thread to acquire the lock multiple times (e.g., during recursive operations) - This guarantees consistency when multiple agents or background tasks access the same context tier concurrently 2. Document the concurrency contract: - `ContextTier.read()` — acquires lock, reads data, releases lock - `ContextTier.write()` — acquires lock, writes data, releases lock - `ContextTier.evict()` — acquires lock, removes data, releases lock ### Classification **Implementation found a better approach** — the implementation provides explicit thread-safety guarantees that the spec should document. This is not a deviation from spec intent; it's a more complete specification of the concurrency model. ### Acceptance Criteria - [ ] `docs/specification.md` documents the thread-safety model for context tiers - [ ] The documentation specifies that `threading.RLock` is used for tier mutations - [ ] The concurrency contract for `read()`, `write()`, and `evict()` operations is documented - [ ] The documentation is placed in the §ACMS Context Tier Architecture section --- **Automated by CleverAgents Bot** Supervisor: Spec Evolution | Agent: spec-update-pool-supervisor --- **Automated by CleverAgents Bot** Agent: new-issue-creator

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