Agent Harnesses

Operate the selected coding-agent host without conflating its configuration, permissions, or lifecycle with another host. Antigravity has its own agy owner. Claude Code has no guide here: use its built-in help and the docs index.

Workflow

1. Check the version-specific reference before declaring a feature unavailable: installed help can omit supported flags.
2. Resolve precedence and permission scope before changing execution behavior: hooks and extensions execute code.
3. Verify the result and the host's own instruction or skill discovery. Use agent-project for shared instruction layout and mcp-setup for MCP registration.

Task guides

• copilot: Copilot sessions and extensions.
• notifications: Diagnose or change managed turn notifications, brain session-context hooks, and their wiring per host.
• opencode: OpenCode sessions and provider configuration.

Gotchas

• Edit managed host keys in fmind/dot: on this workstation, Claude, Copilot, and OpenCode settings are merged from modify_* chezmoi templates in ~/.local/share/chezmoi. A direct edit to a managed key (including through /config or a host's settings skill) reverts on chezmoi apply --force; unmanaged keys survive. Change the source, preview with mise run diff (it excludes encrypted targets), then apply.
• Install vendor skills through the policy: the Copilot and OpenCode guides name each host's sources; install a requested package only through the vendor-skill policy and retain the existing package manager's ownership.