> ## Documentation Index
> Fetch the complete documentation index at: https://docs.meetdarwin.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# MCP access and limits

> What an AI assistant connected to Darwin over MCP can never do, how to disconnect one, rate and size limits, and fixes for common connection problems.

## What an assistant can never do

Through MCP, an assistant cannot see or change billing, your team, API keys or webhook endpoints; cannot delete conversations; cannot erase or export a person's data; and cannot change experiment results. It can only act in the one workspace it was connected to. The chat on your website never gets these tools.

## Disconnect an assistant

Open **Integrations → API → AI assistants**. Each OAuth connection shows the app's name, when it was connected and last used, and its access (**Full access** or **View only**). Select **Disconnect** and confirm. It loses access at once; connecting again needs a new sign-in.

For Claude Code, Cursor or anything using an API key, revoke that key in **API keys**.

An OAuth connection stays signed in while it is used. One that goes unused for 30 days has to sign in again.

## Limits

Each tool call counts as one request against the connection's per-minute [rate limit](https://docs.meetdarwin.ai/api-reference/rate-limits.md). Tool results are capped at 200,000 characters.

## Troubleshooting

> **The assistant says Darwin has no tool for what I asked**
>
> The connection's access doesn't include that tool. A **View only** connection, the read-only URL, or a key without the scope hides it. Disconnect and connect again with **Full access**, or create a key with the scope.

> **Only an owner or admin of this workspace can connect an app**
>
> Ask an owner or admin of the workspace to connect it, or to change your role in **Team**.

> **This request expired**
>
> Consent requests last 15 minutes. Start connecting again from your assistant.

> **Finish adding a card to this workspace**
>
> The workspace has to complete its card step in Darwin before any API or MCP access works.


This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.