claude.ai custom connectors

Checked on 2026-11-06 against claude.com: add a custom connector, connector authentication and support.claude.com.

Custom connectors are shared by claude.ai, Claude Desktop and the mobile apps.

Sign in with OAuth

1. Pro, Max and Ultra: Customize → Connectors → Add custom connector. Team and Enterprise: an Owner opens Organization settings → Connectors → Add → Custom → Web.
2. Name: Crossmart. URL: https://mcp.crossmart.io/mcp.
3. Choose Sign in. Sign in to Crossmart, pick a workspace and approve what Claude may do.

No key is pasted, and each person connects with their own account and role. See Sign in with OAuth.

Or: request headers (beta, some organizations)

If your organization is in Anthropic’s request-headers beta, the connector dialog shows a Request headers section:

1. Add the connector as above, with Authentication: No sign-in.
2. Under Request headers, add x-api-key with your key as the value (create one). x-api-key is one of the pre-approved header names.

The key is shared by everyone in the organization who uses the connector, so create it with the smallest role that works (usually Viewer or Editor). Authentication settings can’t be edited later; remove the connector and add it again to change the key.

If you don’t see Request headers, your organization is not in the beta: sign in with OAuth.

Install the skill

Zip the skills/crossmart folder and upload it under Customize → Skills → + → Upload a skill (code execution must be on). See Using skills in Claude and the Crossmart skill.