pgmnemo-mcp
MCP server for pgmnemo — provenance-gated agent memory in PostgreSQL.
pgmnemo-mcp is an MCP server that exposes
pgmnemo's ingest and recall capabilities
as tool calls for AI agents and LLM hosts (Claude Desktop, Cursor, Zed, etc.).
Requirements
- Python ≥ 3.11
- A PostgreSQL database with
pgmnemoextension installed (CREATE EXTENSION pgmnemo CASCADE;) - pgmnemo ≥ 0.5.0 (install guide)
Install
pip install pgmnemo-mcp
Quick start
# Set the database URL
export DATABASE_URL="postgresql://user:pass@localhost/mydb"
# Start the MCP server (stdio transport)
pgmnemo-mcp
Add to Claude Desktop (~/Library/Application Support/Claude/claude_desktop_config.json):
{
"mcpServers": {
"pgmnemo": {
"command": "pgmnemo-mcp",
"env": {
"DATABASE_URL": "postgresql://user:pass@localhost/mydb"
}
}
}
}
Configuration
| Variable | Default | Description |
|---|---|---|
DATABASE_URL |
postgresql://localhost/pgmnemo |
libpq connection string |
MCP_PORT |
8765 |
Port for HTTP/SSE transport (optional) |
Tools exposed
| Tool | Arguments (all top-level) | Description |
|---|---|---|
pgmnemo.ingest |
text (req), role, topic, importance, project_id, commit_sha, artifact_hash, metadata |
Store a lesson |
pgmnemo.recall |
query (req), top_k |
Retrieve relevant lessons |
ingest arguments are top-level — do not nest them under metadata. Defaults:
role="mcp_agent", topic="general", importance=3, project_id=1. Pass commit_sha
or artifact_hash to satisfy the provenance gate (without one the lesson is a "ghost",
excluded from recall by default).
Usage
# Smoke test — verify DB connectivity
DATABASE_URL=postgresql://user:pass@host/db python -m pgmnemo_mcp --smoke
# SSE transport (for web-based MCP hosts)
MCP_PORT=8765 pgmnemo-mcp
MCP Registry
| Field | Value |
|---|---|
| Server name | pgmnemo |
| Entry point | pgmnemo-mcp |
| Transport | stdio (default) · SSE (MCP_PORT) |
Links
- pgmnemo GitHub — SQL extension source, benchmarks, docs
- INSTALL.md — extension install guide
- USAGE.md — API reference
- CHANGELOG
License
Apache License 2.0
1 maintainer
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