chopratejas 8dcd474aca fix: A7 — memory tool injection session-sticky for both Anthropic and OpenAI ... Closes the second half of P0-6: once memory injects memory_save / memory_search into body["tools"] for a session, every subsequent turn injects the byte-equal same definitions — even if memory is disabled mid-session. Toggling tool list mid-session busts Anthropic prefix cache per guide §6.3 #2. Adds in headroom/proxy/helpers.py: * SessionToolTracker — bounded LRU keyed by (provider, session_id) storing GOLDEN tool-definition bytes from the first injection. Tracker is provider-aware so the same session_id under Anthropic and OpenAI keeps independent state. Reentrant lock for concurrent access; LRU eviction at HEADROOM_TOOL_TRACKER_MAX_SESSIONS (default 1000). * apply_session_sticky_memory_tools — single coordination point with three paths: first-time inject (record golden bytes), sticky replay (always inject golden bytes regardless of inject_this_turn), and skip. Honors HEADROOM_TOOL_INJECTION_STICKY=disabled as a loud operator opt-in for rollback (NOT a fallback). * serialize_tool_definition_canonical — deterministic byte serialization via the same separators=(",",":")/ensure_ascii=False rules as serialize_body_canonical. * log_tool_injection_decision — structured per-decision log line; never logs the tool definition contents. Wires the helper into all four memory tool injection sites: * handlers/anthropic.py — /v1/messages * handlers/openai.py — /v1/chat/completions * handlers/openai.py — /v1/responses * handlers/openai.py — Codex WS path memory_handler.MemoryHandler gains compute_memory_tool_definitions(provider) — a pure builder that returns the tool definitions without mutating a tools list, so the proxy can route through the sticky tracker. The legacy inject_tools(...) is preserved for callers without a session_id. Tests: tests/test_memory_tool_session_sticky.py — 29 unit + integration cases covering: turn-1→turn-2 byte-equality (Anthropic + OpenAI), sticky replay after memory disabled, golden-fixture pin, LRU eviction, provider isolation under shared session_id, thread-safe concurrent access, env-var contract, disabled-mode passthrough, dedupe with client tools. Golden fixtures pin canonical bytes: * tests/fixtures/memory_tool_definitions/anthropic.json * tests/fixtures/memory_tool_definitions/openai.json No regex. No hardcodes (env-configurable: HEADROOM_TOOL_INJECTION_STICKY, HEADROOM_TOOL_TRACKER_MAX_SESSIONS). No silent fallbacks. Per-decision structured logging. Realignment build constraints satisfied.		2026-05-02 10:11:27 -07:00
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anthropic.json	fix: A7 — memory tool injection session-sticky for both Anthropic and OpenAI	2026-05-02 10:11:27 -07:00
openai.json	fix: A7 — memory tool injection session-sticky for both Anthropic and OpenAI	2026-05-02 10:11:27 -07:00