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Sign in to the web app at https://app.letsflow.ai.

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Browser sign-in

Use your organization’s Flow login. Flow manages session handling after you authenticate.

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Authenticate API and CLI clients

Authenticate API and command-line interface (CLI) clients with API keys or OAuth.
1

Open API and MCP Access.

Open Settings → API & MCP Access.
2

Create a key.

Create an API key or service account for the integration.
3

Send the key.

Send the key on requests per the API Reference.
Base URL for machine clients: https://app.letsflow.ai/v1.

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Authenticating hosted MCP

Hosted MCP at https://app.letsflow.ai/mcp uses OAuth for agent clients. Configure the client per Hosted MCP. API keys are not a substitute for MCP OAuth.

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Authorization

Flow roles and team settings grant capabilities, not directory group membership alone. A valid token or session still requires the capability for the action you call.