How do I install Factstore?

Copy the stdio config for Cursor, Claude Desktop, Claude Code, or VS Code on this page. It uses the publisher's install, not a PlugMCP proxy.

Does Factstore need an API key?

The publisher lists these environment variables: FACTSTORE_DSN, FACTSTORE_EXCISE_DSN.

What transport does Factstore use?

Factstore runs locally over stdio.

When was Factstore last checked?

Last checked 2026-11-09. A fact store for AI agents, on Postgres: registered attributes, every write citing its evidence.

Factstore MCP server

Power your agent

Add this server

The publisher's own command. Not a PlugMCP endpoint.

Add to Cursor Add to VS Code Run on PlugMCP

Host a copy with our keys and logs.

Local command

uvx factstore==0.1.0

Credentials from the publisher

FACTSTORE_DSN — The credential `factstore actor STORE NAME` prints: a Postgres connection string for one actor of one store.
FACTSTORE_EXCISE_DSN — An excision credential (`factstore actor --excise`). Only then is the excise tool listed.

Claude Code has no install link for a local command. Copy the command below and run it in a terminal.

shClaude Code

1FACTSTORE_DSN=<secret> FACTSTORE_EXCISE_DSN=<secret> claude mcp add io.github.victor-eu-factstore -- uvx factstore==0.1.0

Run in a terminal.

jsonClaude Desktop

1{2  "mcpServers": {3    "io.github.victor-eu-factstore": {4      "command": "uvx",5      "args": [6        "factstore==0.1.0"7      ],8      "env": {9        "FACTSTORE_DSN": "<secret>",10        "FACTSTORE_EXCISE_DSN": "<secret>"11      }12    }13  }14}

claude_desktop_config.json

Local · pypiPublisher installStep-by-step: add this in Claude

Remote URL or a command on your machine? How the two installs differ

Run on PlugMCP

Host a copy with our keys and logs.

A new server you create. It is not this listing's official endpoint. Use the publisher install when you want their URL and their credentials.

Launch

Server facts

Local

Transport: stdio
Version: 0.1.0

Tools

No tool list yet. Remote servers get one after the first health check.

FAQ

Questions

factstore

A fact store for AI agents, on Postgres. Agents record what a company's systems and documents say as facts: a value for a registered attribute, in a transaction stamped with who wrote it and the document it came from. Nothing is overwritten, so the store can say what it knew on any date.

Skills that ship with it index a company's systems from their exports, and read documents and mail into facts. They leave people's personal details in the source. MIT-licensed.

Install

pip install factstore

In Claude Code, the plugin brings the MCP server and the skills:

/plugin marketplace add Victor-EU/factstore
/plugin install factstore@factstore

factstore/README.md walks through Postgres, a first store and connecting an agent.

What's here


`factstore/`	The kernel, the MCP server, the Python SDK and the CLI
`packages/`	Vocabulary packages: `core`, and `ecom-ops` and `ecom-index` for an online brand
`factstore-skills/`	The catalogue, ontology and ingestion skills
`evals/`	What it was tested on: a synthetic brand, and five public datasets from real companies
`factstore-design.md`	The design, and what testing changed in it
`factstore-build-plan.md`	The milestones, and where each stands

Status

0.1.0, alpha. The kernel's code held unchanged through every test, up to 3.2 million facts in one store. The skills passed every round on public data: product lists, a million order lines, a marketplace's duplicate customers, 100 suppliers' forms and a trader's mailbox. No company has run it on its own data yet.

Add this server

Host a copy with our keys and logs.

Server facts

Tools

Questions

How do I install Factstore?

Does Factstore need an API key?

What transport does Factstore use?

When was Factstore last checked?

Documentation

factstore

Install

What's here

Status