MCP servers · MongoDB · MCP server
Connect Codex CLI to MongoDB
One line gives Codex CLI your MongoDB account as tools: 8 endpoints, aggregate, documents, more, called with your own connection. No key in the prompt, a receipt for every call, revoke Codex CLI's access alone any time.
Three steps
- Create a free 0n3 account and connect MongoDB. Paste a key or sign in; it lands in your vault, encrypted.
- Install 0n3 into Codex CLI. OpenAI's terminal agent reads 0n3 over Streamable HTTP with a token from your environment.
- Ask Codex CLI: whoami. Then: "Aggregate in MongoDB".
Put the token in your environment
export ON3_TOKEN="<your 0n token>"
Add it to your shell profile so Codex finds it next time.
The line above carries a placeholder; 0n3.app/install mints a real key named for Codex CLI and fills it in.
What Codex CLI can then do in MongoDB
Aggregate · Run aggregation pipelines1
Aggregate
POST /action/aggregateDocuments · CRUD operations on documents0
CRUD operations on documents
More · Everything else this app exposes.7
Find one
POST /action/findOneFind many
POST /action/findInsert one
POST /action/insertOneInsert many
POST /action/insertManyUpdate an one
POST /action/updateOneUpdate a many
POST /action/updateManyDelete an one
POST /action/deleteOneMongoDB in other AI clients
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