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Portable memory for AI agents: an Obsidian vault served over MCP, on npm and the official MCP Registry, rated A on Glama.

2brain.debawho.xyzGitHubnpmMCP Registry

Second Brain(09.2026 – Present)

brain-mcp · v0.5.2 · MIT

Portable memory for your agents.

A personal superintelligence built from the notes you already keep: one Obsidian vault, served over MCP from your own machine to every AI you use.

Memory for Hermes Agent

brain_contexthybrid · local

Which database does Harbor Ledger use, and how do I restore it?

  • hubHarbor Ledger0.98
  • runbookRestore the ledger database0.97
  • noteHome server facts0.92
  • conceptPostgreSQL0.90

coverage: good · example vault

drag to turn · hover a note

Insights(02.10 – 17.10)

npm downloads
668since 08.10
Git clones
425161 unique in 14 days
Right note first
83%vs 42% keyword only
MCP tools
148 read · 6 write
Git clones of brain-mcp per day, 02.10 to 17.10

Git clones of brain-mcp per day, 02.10 to 17.10
DateGit clonesUnique cloners
02.10.202600
03.10.202600
04.10.202611853
05.10.20261511
06.10.2026106
07.10.202644
08.10.202614227
09.10.20265530
10.10.20261610
11.10.202675
12.10.202633
13.10.202685
14.10.202611
15.10.2026158
16.10.2026216
17.10.2026108

Verified(4)

History(45 commits)

45 commits over 15 days, 6 releases
  1. v0.2.0
    10
    04.10
  2. 05.10
  3. 1
    06.10
  4. 07.10
  5. v0.4.0v0.3.0
    14
    08.10
  6. 09.10
  7. 10.10
  8. 11.10
  9. 12.10
  10. 13.10
  11. 14.10
  12. 15.10
  13. 5
    16.10
  14. 3
    17.10
  15. v0.5.2v0.5.1v0.5.0
    12
    18.10

What I built

  • Open-source MCP server that turns an Obsidian vault into live, private context for Claude and any MCP client: who you are, what you are working on, and tools to search, follow links and write back.
  • Graph-aware hybrid retrieval that never leaves the machine — section BM25 and bge-small embeddings fused with RRF, a walk from the best notes along their strongest links, a cross-encoder reranker, and a floor that answers "nothing relevant" instead of guessing.
  • Public over OAuth 2.1 behind Cloudflare Tunnel, with read, write and private scopes, credential redaction and an audit line for every call. Any ranking change has to beat the bundled evals first.
  • TypeScript
  • MCP
  • SQLite FTS5
  • Embeddings
  • OAuth 2.1

Downloads from the npm registry, clones from GitHub repository traffic (owner only, kept 14 days, stored here as it rolls).

Retrieval figures from eval-retrieval.mjs on the example vault, in the brain-mcp README.

The 3D brain pins every note of an illustrative everyday vault (the same as on 2brain.debawho.xyz) to the cortex; orange arcs are its wikilinks.

Live figures as of 18.10.2026.

Next project

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SECOR

Local security checks for what you build with AI, and a guard on every MCP tool call your agent makes.

M8ven 89/1001,368 tests10.2026 — Present