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## Description Anthropic request-side CCR can still compress a turn into retrieval markers after the frozen-prefix cache guard suppresses `headroom_retrieve` registration. That leaves the model with marker-only context it cannot redeem, so the proxy silently drops recoverable data on exactly the turns where cache preservation deferred tool injection. This change couples the Anthropic request-side CCR path to tool availability so a turn never emits retrieve-only markers without the retrieval tool, even when token mode or cache-mode prefix replay could otherwise reuse already-compressed marker text. Closes #1006 After a collaborator merged current `main` into this branch, CI also picked up unrelated offline-memory failures from the merged base. Those follow-up changes are test-only: they keep the offline Hugging Face cache lanes skipping cleanly instead of failing in memory tests that are outside the CCR runtime path. ## Type of Change - [x] Bug fix (non-breaking change that fixes an issue) - [ ] New feature (non-breaking change that adds functionality) - [ ] Breaking change (fix or feature that would cause existing functionality to change) - [ ] Documentation update - [ ] Performance improvement - [ ] Code refactoring (no functional changes) ## Changes Made - Couple Anthropic request-side CCR compression to the same frozen-prefix guard that already defers `headroom_retrieve` registration. - Keep the existing cache-preservation behavior: frozen-prefix turns stop emitting CCR retrieval markers instead of forcing tool injection into the cached prefix. - Make the skip decision use the effective frozen prefix after token-mode reclamping, so turns that genuinely reclamp to zero still keep normal reversible CCR behavior. - Bypass cached marker reuse in both token mode and cache-mode prefix replay when tool injection is deferred. - Add focused regressions for the Anthropic request-path seams under this bug: - frozen-prefix turns do not emit marker-only payloads - unfrozen turns still keep normal reversible CCR behavior - token-mode reclamp back to zero still compresses normally - existing `headroom_retrieve` tools keep reversible CCR on frozen turns - cache-mode delta reuse and exact-prefix replay both forward original content when retrieval is unavailable - Add a `CHANGELOG.md` entry because the proxy's user-visible Anthropic CCR behavior changes. - Add a shared test skip helper for offline Hugging Face cache misses and apply it to the merged `main` memory tests that were failing only in the offline CI shards after the branch picked up current `main`. ## Testing - [x] Unit tests pass (`uv run pytest tests/test_proxy/test_anthropic_ccr_deferred_injection.py`) - [x] Linting passes (`uv run ruff check . && uv run ruff format . --check`) - [ ] Type checking passes (`uv run mypy headroom`) - [x] New tests added for new functionality when applicable - [ ] Manual testing performed ### Test Output ```text uv run pytest tests/test_proxy/test_anthropic_ccr_deferred_injection.py 14 passed, 1 warning in 34.19s uv run pytest tests/test_memory/test_skip_helpers.py tests/test_memory/test_embedder_mps_serialization.py::test_cpu_uses_shared_executor tests/test_memory/test_hierarchical.py::TestLocalEmbedder::test_embed_single tests/test_memory_bridge.py::TestMemoryBridgeImport::test_import_claude_code_memory tests/test_memory_handler_concurrent_init.py::test_real_localbackend_initializes_via_public_entrypoint tests/test_memory_system.py::TestLocalBackend::test_save_memory_basic -q 4 passed, 5 skipped, 11 warnings in 7.65s uv run ruff check . All checks passed! uv run ruff format . --check 968 files already formatted ``` ## Real Behavior Proof - Environment: local FastAPI `TestClient` for the Anthropic request path, plus Windows Python 3.12 offline-memory repros with `TRANSFORMERS_OFFLINE=1` - Exact command / steps: Run the focused CCR regression command and the offline-memory repro subset below on the merged branch state. - `uv run pytest tests/test_proxy/test_anthropic_ccr_deferred_injection.py` - `uv run pytest tests/test_memory/test_skip_helpers.py tests/test_memory/test_embedder_mps_serialization.py::test_cpu_uses_shared_executor tests/test_memory/test_hierarchical.py::TestLocalEmbedder::test_embed_single tests/test_memory_bridge.py::TestMemoryBridgeImport::test_import_claude_code_memory tests/test_memory_handler_concurrent_init.py::test_real_localbackend_initializes_via_public_entrypoint tests/test_memory_system.py::TestLocalBackend::test_save_memory_basic -q` - Scenario coverage from the CCR pytest command: - frozen prefix with deferred tool injection and cached marker text available in token mode - unfrozen turn with normal CCR marker emission - token mode where the tracked frozen prefix reclamps back to zero - frozen prefix where the client already supplied `headroom_retrieve` - cache-mode append-only delta reuse with a previously forwarded compressed prefix - cache-mode exact-prefix replay where the previous forwarded prefix already contained a marker - Scenario coverage from the offline-memory repro command: - direct local embedder startup on CPU with no cached HF model - hierarchical memory embedder startup with offline model cache missing - bridge import through `LocalBackend` - `MemoryHandler` public init warmup path - `LocalBackend` save path under the offline lane - Observed result: The CCR regression keeps marker-free forwarding on frozen turns without tool availability, and the merged-`main` offline-memory lanes now skip cleanly instead of failing unrelated CI shards. - frozen-prefix Anthropic turns without tool availability forward the original long transcript across both token-mode and cache-mode reuse paths, while unfrozen turns, reclamped token-mode turns, and frozen turns that already advertise `headroom_retrieve` keep the reversible CCR marker path - the merged-`main` offline-memory regressions now skip cleanly when the Hugging Face cache is unavailable instead of failing unrelated CI shards - Not tested: live Zed session cache-hit behavior, provider latency under real Anthropic upstreams, and online Hugging Face download lanes ## Review Readiness - [x] I have performed a self-review - [x] This PR is ready for human review ## Checklist - [x] My code follows the project's style guidelines - [x] I have performed a self-review of my code - [x] I have commented my code, particularly in hard-to-understand areas - [x] I have made corresponding changes to the documentation - [x] My changes generate no new warnings - [x] I have added tests that prove my fix is effective or that my feature works - [x] New and existing unit tests pass locally with my changes - [x] I have updated the CHANGELOG.md if applicable ## Additional Notes - Runtime scope is still intentionally narrow to Anthropic request-side CCR. OpenAI, Gemini, streaming, and response-side CCR behavior are unchanged. - The only non-CCR diff is the test-only offline-memory follow-up required after current `main` was merged into the branch. - The focused proxy pytest run still emits the Windows-local `StarletteDeprecationWarning` from `fastapi.testclient`'s `httpx` bridge. The offline-memory repro command also emits existing datetime deprecation warnings and a pytest teardown warning around skipped offline lanes; none of those warnings were introduced by the CCR runtime change. |
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| .. | ||
| __init__.py | ||
| conftest.py | ||
| test_budget.py | ||
| test_core_operations.py | ||
| test_easy.py | ||
| test_embedder_mps_serialization.py | ||
| test_extraction.py | ||
| test_factory.py | ||
| test_factory_external.py | ||
| test_hierarchical.py | ||
| test_learn_flag.py | ||
| test_mcp_server.py | ||
| test_qdrant_env.py | ||
| test_skip_helpers.py | ||
| test_traffic_learner.py | ||
| test_writers.py | ||