Point an agent at an MCP server and its tools become typed, retryable steps with their inputs and outputs in the trace.
Tools can be marked as needing approval or as idempotent, just like SDK tools.
3.7.0
v3.7 · MCP tool servers
Agents can call tools from any MCP server, with each call recorded as a step.
Feature
Earlier
Recent releases.
4.2.0
v4.2 · Replay from any step, in bulk
Select hundreds of failed runs and replay them from the step that broke, with the fix you just deployed.
4.1.0
v4.1 · Approvals in Teams and email
Human-in-the-loop requests can now be answered from Microsoft Teams and email as well as Slack.
4.0.3
v4.0.3 · Faster cold starts in eu-west
Median step start latency in eu-west dropped from 180 ms to 41 ms.
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Free for 50,000 steps a month. No credit card, no separate workers, and your first durable workflow deployed before lunch.