harness-adapters

Use this reference before any harness-specific firstmate operation: spawn, recovery, trust-dialog handling, skill invocation, interrupt, exit, resume, or adapter verification.

Crewmates default to the same harness firstmate is running on unless config/crew-harness records an adapter name. Optional dispatch profiles in config/crew-dispatch.json can override that static default for one crewmate or scout dispatch by selecting concrete harness, model, and effort axes at intake. The captain may override that file at bootstrap or later; a per-task instruction such as "run this one on codex" overrides it for that dispatch only. default means mirror firstmate's own harness.

Secondmates have their own harness knob, so a secondmate can run on a different adapter than crewmates. config/secondmate-harness is the harness the primary uses to launch SECONDMATE agents, resolved through the fallback chain config/secondmate-harness -> config/crew-harness -> firstmate's own. An absent or default config/secondmate-harness therefore behaves exactly as the crew harness did before this knob existed (secondmates launched on the crew harness); setting it splits the two. config/crew-dispatch.json and config/crew-harness are inherited by secondmate homes (the primary pushes them down so a secondmate's own crewmates use the primary's dispatch profiles and static harness value), while config/secondmate-harness is the primary's own setting and is never inherited - secondmates do not spawn secondmates. Inheritance copies the literal config/crew-harness file, so for a secondmate's own crewmates to run on the primary's crewmate harness the captain must set config/crew-harness to a concrete adapter name, such as codex. If config/crew-harness is unset or default, there is no concrete value to inherit, so the secondmate's own crewmates fall back to the secondmate's own/detected harness rather than the primary's effective crewmate harness. Inheritance also copies the literal config/crew-dispatch.json file, so secondmates apply the same best-fit profile rules for their own crewmates.