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# MCP: roll out a change set to a slice of live traffic

An AI assistant connected over the MCP server can now serve a testing change set to a sample of new conversations before it is promoted. The staged variants run against real traffic while the rest of the AI Agent stays on the live version.

## What's new

* **Start a rollout**: [`edit_agent_behavior`](/mcp/tools/edit-agent-behavior) accepts `set_rollout` with `changeset_id`, `percentage` (1–100), and `max_conversations`. The rollout completes the moment the cap is reached.
* **Stop a rollout**: `edit_agent_behavior` accepts `stop_rollout` with `changeset_id`. No further conversations are sampled in. Conversations already pinned to the change set keep serving its variants until they end.
* **Combined cap**: percentages across all active rollouts on the same Agent must sum to at most 100.