Notion MCP lets external assistants start and follow Custom Agent sessions
TL;DR
On August 27, 2026, Notion added MCP tools for working with Custom Agent sessions. An authorized external assistant can find sessions, start work, follow progress, send follow-up messages, and stop a run when the connection exposes those tools.
- Status
- Live
- Released
- Plans
- Not specified
What changed
Notion MCP added a session interface for Custom Agents. It supports finding earlier sessions and interacting with new or running work through the connection's available tools.
This is separate from the later MCP page, comment, and calendar tools.
Why it matters
An external assistant can coordinate with a workspace agent instead of reproducing its instructions elsewhere. A useful workflow might ask an existing reporting agent for a result, wait for completion, and bring that result back for review.
Keep responsibility clear: identify which agent owns the job, what completion means, and who reviews its output.
Frequently asked questions
Can every Notion MCP connection call a Custom Agent?
No. The workspace needs access to Notion AI and Custom Agents, and the connection must expose the relevant capability and session tools.
Can an assistant send another message while a session is running?
The current documentation says follow-up messages can return a conflict while a run is active. Wait for that run before sending another message.
Does a session link grant access to the agent?
No. Session operations remain subject to connection and workspace permissions.