Composio (API + MCP) vs One

Composio (API + MCP)

Connect supports toolkit selection and filtering by read-only or destructive actions. Rube closed on 16 May 2026, so existing rube.app configurations need migration.

One

One's remote MCP server has three tools, OAuth 2.1 sign-in with PKCE and a consent screen that sets read only, read and write, full or per-action access for each connection. A person must sign in through a browser, the SOC 2 audit is unfinished, and the site's changelog stops at 13 July 2026.

Composio (API + MCP)

1. Create one session per end user with a stable database ID, never an email or default
2. Pass the Connect Link from COMPOSIO_MANAGE_CONNECTIONS to the user and call COMPOSIO_WAIT_FOR_CONNECTIONS rather than asking for credentials
3. Filter the session to readOnlyHint tools when the task only reads
4. Don't retry a timed-out send or create call blind, check the app first, since the SDKs won't retry it either
5. Replace any rube.app/mcp entry with connect.composio.dev/mcp or a session MCP URL

One

1. Call list_one_integrations first and read each connection's access field. When the policy is actions, run those ids directly without calling find_one_actions
2. Send every operation a task needs in one find_one_actions call, up to 10 requests, each a platform and a short intent with no IDs, names or message text
3. When a document comes back as a digest, call find_one_actions again with load and a section name. Don't guess parameters the digest left out
4. After a timeout on execute_one_action, check whether the write took effect before sending it again. No idempotency key is documented
5. A 403 for a call outside the grant won't succeed on retry. Ask the user to widen the grant in the dashboard or reconnect