agent-harnesses git:20261005.e9af7a2A

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---
name: agent-harnesses
description: "Operate and configure Claude Code, Codex, Copilot, Grok, and OpenCode."
license: MIT
metadata:
  kind: collection
  author: Médéric HURIER (Fmind)
  source: github.com/fmind/dot/tree/main/skills/agent-harnesses
  created: "2026-09-16"
  updated: "2026-10-05"
---

# Agent Harnesses

Operate the selected coding-agent host without conflating its configuration, permissions, or lifecycle with another host. Antigravity has its own [agy](../agy/SKILL.md) owner.

## Workflow

Every host follows these steps; read only the matching guide for its specifics and required resources.

1. **Inspect the installed contract**: run the host's `--version` and `--help`; identify the surface (CLI, app, IDE, or cloud), workspace, configuration scope, and the session to start or resume.
1. **Refresh evolving details**: read the relevant official page and changelog before relying on flags, settings, models, or feature availability. Compare with installed help, which can omit supported flags; report version gaps before applying a newer recipe, and keep release-specific details upstream.
1. **Use the documented interface** for the session, configuration, or extension. Resolve configuration precedence and permission scope before changing execution behavior; hooks and extensions execute code.
1. **Verify** the result, resulting artifacts, and the host's own instruction or skill discovery. Use [agent-project](../agent-project/SKILL.md) for shared instruction layout and [mcp-setup](../mcp-setup/SKILL.md) for MCP registration.

## Task guides

<!-- guides:start -->

- [claude](references/claude/GUIDE.md): Claude Code sessions and customization.
- [codex](references/codex/GUIDE.md): Codex sessions and customization.
- [copilot](references/copilot/GUIDE.md): Copilot sessions and extensions.
- [grok](references/grok/GUIDE.md): Grok Build sessions and configuration.
- [notifications](references/notifications.md): Diagnose or change managed turn notifications and their hooks per host.
- [opencode](references/opencode/GUIDE.md): OpenCode sessions and provider configuration.

<!-- guides:end -->