Locus
Gives Claude a hierarchical markdown file system designed around the method of loci: each directory is a "room" containing specific knowledge, and agents read only what they need instead of loading everything. Exposes five MCP tools over stdio: memory_list (navigate rooms), memory_read, memory_write (session logs only, canonical files are protected), memory_search (ripgrep or fallback), and memory_batch (read up to 20 files at once). Includes optional Ed25519 signing to tag outputs as trusted or data before the agent sees them. Built for keeping context windows small when working across multiple projects or knowledge domains. Benchmarks show 52% fewer context lines loaded for specific queries compared to flat memory files.
- tools
- 5
- transport
- STDIO
- last updated
- Mar 3, 2026
Tools
5 toolsPublic tool metadata for what this MCP can expose to an agent.
memory_listReturns INDEX.md (no args) or lists a room's files
Returns INDEX.md (no args) or lists a room's files
No parameter schema in public metadata yet.
memory_readReads any file in the palace
Reads any file in the palace
No parameter schema in public metadata yet.
memory_writeAtomically writes a file (guarded — cannot write to _metrics/, sessions/, .sig/, .security/)
Atomically writes a file (guarded — cannot write to _metrics/, sessions/, .sig/, .security/)
No parameter schema in public metadata yet.
memory_searchRanked full-text search over the shared FTS5 index (see Recall); ripgrep only without FTS5
Ranked full-text search over the shared FTS5 index (see Recall); ripgrep only without FTS5
No parameter schema in public metadata yet.
memory_batchReads up to 20 palace files in a single call — use for multi-room loads
Reads up to 20 palace files in a single call — use for multi-room loads
No parameter schema in public metadata yet.
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Locus
Hierarchical markdown-based memory system for autonomous AI agents. Each directory is a room (locus) in the palace, containing specific knowledge navigated on demand. Named for the atomic unit of the Method of Loci.
Core idea: Keep context windows small. Load only the room you need, not the whole palace.
How it works
Details
- Repository
- github.com/edkarlsson/locus
- Categories
- AI & LLM Tools, Documents & Knowledge
- Package
locus-mcp- Transport
- STDIO
- Registry
- MCP registry, active
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