You need a free agent0 account before you can connect it to an assistant. It takes about a minute.
What your assistant needs
agent0 is not yet listed in the ChatGPT app directory. Today it is added as a custom connector by URL, and the setting that allows that depends on your plan — check it before you create an account:
- Claude — Customize › Connectors › Add custom connector (Team and Enterprise: Organization settings › Connectors). Claude’s help centre lists custom connectors for the Free, Pro, Max, Team and Enterprise plans, with Free limited to one connector.
- ChatGPT — custom connectors need Developer mode. OpenAI’s help centre lists it for Business and Enterprise/Edu workspaces (an admin turns it on) and lets Pro users connect to MCP servers with read permissions in Developer mode. Plans without that setting cannot add agent0 by URL today.
- Codex — uses its own connector URL,
https://mcp.agent0.ca/codex/mcp, in Codex’s MCP settings.
Plan rules are the vendors’ and change; the connector setting in your assistant is the source of truth. Searching and browsing on this website need none of this.