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Guild’s runtime can drive agent turns with the opencode coding engine. The opencode driver runs alongside the Claude, Codex, and Antigravity drivers, so the runtime can execute any of these engines in the same environment. This page describes how the runtime installs and executes opencode. You do not set these values yourself — the runtime manages them for every turn.

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Execution environment

The runtime container installs the opencode-ai command-line interface (CLI), which provides the opencode command that the driver runs.

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Running a turn

The driver runs opencode as a subprocess to execute a single tool-less turn. The turn runs without tools, so the engine produces its result from the prompt alone.

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Event-stream translation

The driver runs opencode with --format json and reads the resulting event stream. It translates each event into the same task notifications any other agent emits: