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Responsibilities

  • Accept requests from the SDK or MCP layer.
  • Create an appropriate sandbox.
  • Run the requested workload.
  • Collect output and execution state.
  • Terminate and remove the environment.

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Control plane, not model context

The runtime is where operational decisions belong: resource limits, timeouts, available images, network rules and eventually policy and credential controls. These decisions should not live in the agent’s reasoning loop or model context.

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Implementation

The runtime is implemented as Petri, an open source FastAPI service. Users interact with it through the jhansi.io SDK or MCP server — the internal name is an implementation detail.