CLI: Harnesses

A saved harness is a workspace’s named change to one agent: its skills, instructions, options, and subagent model. Run it with compare --saved-harness ID (Evaluate). Harnesses belong to the workspace (--org), not a repository.

Command	Does
`harnesses`	Each saved harness and what it changes
`harness create --name N [flags]`	Save one
`harness update ID --name N [flags]`	Replace one. Runs that used it keep what they ran.
`harness show\|delete ID`	One harness; delete it

Flags

Flag	Does
`--agent AGENT`	The agent it changes: `claude-code`, `codex`, `pi`, … Its skills, options, and subagent model are for that agent alone.
`--skill ORG/REPO[@REF]` (repeatable)	A GitHub repository whose `skills/` folder Harbor installs
`--instructions TEXT` · `--instructions-file F`	Appended to every task’s instruction
`--option AGENT.OPTION=VALUE` (repeatable)	An option on the agent; `VALUE` is JSON when it parses, text otherwise, or `@FILE`, as in `claude-code.config=@settings.json`
`--subagent-model ID`	The model Claude Code’s and Codex’s subagents run on
`--subagent-prompt TEXT` · `--subagent-prompt-file F`	What the agent is told about delegating. Default: delegate a meaningful part of each task. `""` tells it nothing.
`--subagent-credential ID`	The credential that serves the subagent model. Default: the first that can.
`--body JSON\|@FILE`	A full harness body in place of the flags

catalog R --harness AGENT lists the options an agent takes. The older conditions and condition commands still work.

self-bench harness create --name "Haiku Subagents" --agent claude-code \
  --subagent-model claude-haiku-5-5 --subagent-credential CREDENTIAL_ID \
  --subagent-prompt "Hand the test run to a subagent and check its report."
self-bench compare --repo acme/app --model claude-opus-5-5 --harness claude-code \
  --saved-harness 3

CLI

API

Public Results

Flags