Adapts three more memory backend PRs to the MemoryProvider interface:
OpenViking (PR #3369 by Mibayy):
- 3 tools: viking_search, viking_read, viking_browse
- Read-only, self-hosted server, no sync/prefetch
- URI-based content with progressive disclosure levels
RetainDB (PR #2732 by Alinxus):
- 5 tools: retaindb_profile, retaindb_search, retaindb_context,
retaindb_remember, retaindb_forget
- Cloud API with prefetch, sync, and memory bridging
- Durable write-behind queue pattern
Cognitive Memory (PR #727 by 0xbyt4):
- 1 tool with 4 actions: recall, store, forget, status
- Local SQLite with vector embeddings (litellm)
- Auto-classification, importance decay, dedup, forgetting
All gated on credentials/deps via is_available():
- OpenViking: OPENVIKING_ENDPOINT + server health check
- RetainDB: RETAINDB_API_KEY
- Cognitive: litellm importable (uses its env vars for embedding API)
Adapts PR #1811 (Hindsight by benfrank241) and PR #2933 (Mem0 by
kartik-mem0) to the MemoryProvider interface as drop-in plugins.
Hindsight plugin (plugins/hindsight-memory/):
- 3 tools: hindsight_retain, hindsight_recall, hindsight_reflect
- Cloud (API key) or local (embedded PostgreSQL) modes
- Background prefetch with thread isolation for aiohttp
- Auto-sync turns to knowledge graph
Mem0 plugin (plugins/mem0-memory/):
- 4 tools: mem0_profile, mem0_search, mem0_context, mem0_conclude
- Server-side LLM fact extraction and deduplication
- Semantic search with optional reranking
- Verbatim fact storage via conclude (infer=False)
Both require API keys (HINDSIGHT_API_KEY / MEM0_API_KEY) and the
respective SDK packages (hindsight-client / mem0ai). is_available()
gates on credentials so installing the plugin without a key is safe.
Adapts PR #2351 by dusterbloom to use the new MemoryProvider ABC.
Core files (store.py, retrieval.py, holographic.py) unchanged from
the original PR. The __init__.py register() function now calls
ctx.register_memory_provider() instead of ctx.register_tool().
HolographicMemoryProvider implements:
- initialize() — creates SQLite DB + FactRetriever
- system_prompt_block() — shows fact count when active
- prefetch(query) — FTS5 search for turn context
- get_tool_schemas() — fact_store (9 actions) + fact_feedback
- handle_tool_call() — routes to store/retriever
- on_session_end() — auto-extract preferences (opt-in)
- on_memory_write() — mirrors builtin memory writes as facts
39 tests (22 HRR math + 17 provider adapter), all passing.
