feat: add external coding harness agents#2826
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Add support for harness-backed agents that delegate coding tasks to external coding CLIs through github.com/rumpl/harness. Harness agents can now be configured with a `harness` block in agent YAML and used as sub-agents by an orchestrator. The runtime detects harness-backed agents, builds a prompt from the current session, streams text/reasoning output back into docker-agent, records final assistant responses, and forwards usage when reported by the harness. Supported harness types: - claude-code - codex - pi - opencode Also update config validation and schema support so harness agents do not need docker-agent model providers, add an example configuration, and handle external harness tool call lifecycle events including partial tool calls and tool results.: Signed-off-by: Djordje Lukic <djordje.lukic@docker.com>
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dgageot
approved these changes
May 20, 2026
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Note, this is a smaller set of changes from #2796, there is no openclaw or copilot (yet), the external harnesses run in the current working directory and there is no env filtering so exernal harnesses get the same env as docker-agent.
It's a nice first step IMO
Add support for harness-backed agents that delegate coding tasks to external coding CLIs through github.com/rumpl/harness.
Harness agents can now be configured with a
harnessblock in agent YAML and used as sub-agents by an orchestrator. The runtime detects harness-backed agents, builds a prompt from the current session, streams text/reasoning output back into docker-agent, records final assistant responses, and forwards usage when reported by the harness.Supported harness types:
Also update config validation and schema support so harness agents do not need docker-agent model providers, add an example configuration, and handle external harness tool call lifecycle events including partial tool calls and tool results.