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Midplane

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A gateway between AI agents and Postgres: table access, masking at the source, approvals and audit.

Code source Site web Documentation

Installation

Ajoutez ceci à la configuration MCP de votre client (Claude Desktop : claude_desktop_config.json ; Cursor : .cursor/mcp.json ; VS Code et les autres utilisent la même forme « mcpServers »).

NPM package midplane
Claude Code 
claude mcp add midplane -e 'MIDPLANE_TOKEN=<your midplane_token>' -- npx -y midplane@0.23.0 local --config --stdio
Configuration JSON (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "midplane": {
            "command": "npx",
            "args": [
                "-y",
                "midplane@0.23.0",
                "local",
                "--config",
                "--stdio"
            ],
            "env": {
                "MIDPLANE_TOKEN": "<your midplane_token>"
            }
        }
    }
}

Variables d'environnement

  • MIDPLANE_TOKEN obligatoire secret A token from `midplane token`, verified at start and on every call. It stays in this entry, so give it a --ttl (seconds) as long as the entry should work: the default is an hour.

Documentation

Tirée du README du projet sur GitHub, actualisée chaque semaine. Les liens ouvrent GitHub.

Sommaire
  1. What it enforces
  2. Get started
  3. Quickstart
  4. Documentation
  5. Contributing
  6. License

A gateway between AI agents and your Postgres databases.

Every statement is checked against your policy and recorded before it runs.

Quickstart · Documentation · Midplane Cloud

Agents get useful once they can read your real tables, but a database role that reads every column and writes every row is not a control you can show a security reviewer. Midplane is that control. Agents connect to the gateway over MCP; it parses each statement with Postgres' own parser, decides it against your policy, records it, and only then runs it, with masks written into the query itself.

What it enforces

  • Table access, denied by default, per table.
  • Masking at the source: hashes, partial values, generalized dates, NULLs, applied before any filter, join or aggregate sees the raw value.
  • Guardrails: one statement at a time, writes need a WHERE, no writes hidden in a WITH, reads in read-only transactions with timeouts.
  • Approvals: writes held for a person, bound to the exact statement and checked against the row count the approver saw.
  • Containment: once an agent reads a column labeled untrusted (support tickets, emails), its writes are held and secret tables are closed to it.
  • An audit log on the gateway's own disk, hash-chained, exported and verified with one command.

The gateway runs in your network, next to your databases, and opens every connection itself.

Get started

  • A sample database, no account: the quickstart below.
  • Your own database, with Midplane Cloud, for policy in a dashboard, approvals and a query log; the cloud never holds a database credential or sees a row. Follow get started. Midplane Cloud is invite-only for now: get access.
  • Your own database, no account: local mode.

The gateway is the midplane npm package, run with npx, or the image ghcr.io/midplaneai/midplane. Both are built from this repository's tags with provenance, and the image is signed: verifying a release.

Quickstart

You need Node 24.16 or newer, Docker, and an MCP client such as Claude Code.

git clone https://github.com/midplaneai/midplane.git
cd midplane/examples/quickstart
docker compose up -d --wait

Then follow its steps: a sample shop database and the gateway in local mode, with nothing leaving your machine. Ask your agent:

AskWhat happens
"List our customers with their emails and phone numbers."Emails hashed, phones cut to the last four digits, signup dates to the month
"Delete all support tickets."Denied: a write needs a WHERE
"Mark ticket 2 as closed."Held for approval; local mode has nobody to ask, so it's refused
"Summarize ticket 1."Its body carries a prompt injection; reading it taints the agent
"Now show me the API keys."Denied: a tainted agent can't read secret tables

In Midplane Cloud, Try with sample data runs the same sample linked, where the held write waits for your approval instead.

Documentation

midplane.ai/docs: how it works, deploying the gateway, configuration, masking, approvals and taint, audit and troubleshooting. Its source is in docs/.

Contributing

Bugs and questions go to issues; building and testing is in CONTRIBUTING.md. Found a way around a mask, a policy or the audit log? Report it privately: SECURITY.md.

License

MIT, see LICENSE.

Questions fréquentes

Qu'est-ce que Midplane ?

A gateway between AI agents and Postgres: table access, masking at the source, approvals and audit.

Comment installer Midplane ?

Il s'exécute sur votre machine. Dans Claude Code : claude mcp add midplane -e 'MIDPLANE_TOKEN=<your midplane_token>' -- npx -y midplane@0.23.0 local --config --stdio. Pour les autres clients, collez la configuration JSON de cette page dans leurs réglages MCP.

Faut-il une clé API pour Midplane ?

Oui. Il attend MIDPLANE_TOKEN, à renseigner dans sa configuration.

Midplane est-il open source ?

Oui. Son code est sur GitHub sous licence MIT.

Qui maintient Midplane ?

Il est publié par midplaneai. AI.tn le référence sans le maintenir ni le recommander.

Issu du registre MCP officiel. Être listé n'est pas une recommandation : vérifiez le code et les permissions d'un serveur avant de lui donner accès à vos données.