Myco Brain MCP server

Persistent, source-traceable memory for AI agents — self-hosted on your own Postgres, with no API keys required to run.

• Source-traceable. Every fact traces to the document it came from (brain_why) — no trust-me summaries.
• Trust that compounds. Independent corroboration raises a fact's confidence; a contradiction supersedes it — kept and audited, never silently overwritten.
• Keyless & local-first. Full-text + semantic search and the knowledge graph all run with zero hosted dependency — add an Anthropic key only for the most accurate graph.
• Yours. Apache-2.0, plain Postgres tables, 13 MCP tools. Works with Claude, Cursor, Windsurf, Continue, Zed.

Who it's for: dev teams running agents that need one shared memory · agencies needing hard per-client isolation · anyone who wants their assistant to remember across sessions — import your ChatGPT / Claude history (from your data export) and your AI knows you on day one.

Built solo by a growth marketer — not a career engineer — directing AI coding agents over ~3 months. How it was built ↓

The usual fix for agent amnesia — letting an LLM maintain its own memory — fills it with duplicates, hallucinated summaries, and confident answers nobody can trace. Myco Brain is built on the opposite contract:

**The LLM proposes. Deterministic rules decide what becomes a fact. You set

the bar** — from corroboration-gated auto-promotion (the default) to strict

human review of every fact (BRAINREQUIREHUMAN_REVIEW=1).

Claude, Cursor, Windsurf, Continue, Zed, and custom agents all share one memory backed by your own Postgres.

⭐ If the trust model resonates, a star helps others find it.

# 1. Boot the stack (Postgres + MCP server + extraction worker)
git clone https://github.com/thegoodguysla/myco-brain.git && cd myco-brain
docker compose up -d

# 2. Give your agent a memory — point it at any repo or folder
#    (no env needed: it finds the quickstart stack on localhost)
npx -y -p @mycobrain/mcp-server mycobrain-ingest github:your-org/your-repo

# 3. Connect your client (one-liner below), then ask across sessions:
#    "what did we decide about auth, and where is that documented?"
#    → answered from your docs, with the source cited.

[!TIP]

Zero API keys, all the way down. Full-text search, semantic search (local

embeddings), and the knowledge graph (local extraction) all run with no hosted

dependency. Add an Anthropic key only if you want the most accurate graph.

MCP-native by design — your agent knows when to use memory, not just how. Most MCP servers expose tools and hope the model calls them. Myco ships a usage contract over MCP's instructions channel: the moment it connects, your agent knows to pull context before a task, save durable decisions, and cite sources with brain_why — no per-project prompting. Tune the policy in one copy-paste block: Teach your agent to use it well.

Shortened. The full README is on GitHub.