coding-agent-kit

Setup kit for coding agents. Install once, then use structured project understanding, planning, implementation, and review workflows across projects.

Supported targets:

• Codex
• opencode
• Google Antigravity
• Claude Code

coding-agent-kit installs one platform at a time.

What's Included

Codex

• Managed global guidance block in ~/.codex/AGENTS.md
• 9 personal Codex skills in ~/.agents/skills/
• A local Codex plugin at ~/plugins/coding-agent-kit
• A personal marketplace entry in ~/.agents/plugins/marketplace.json
• Language overlay for the Communication section

Codex skill names are prefixed to avoid collisions:

• coding-agent-scan-project
• coding-agent-write-docs
• coding-agent-setup-project
• coding-agent-skill-creator
• coding-agent-brainstorm-feature
• coding-agent-write-plan
• coding-agent-implement-task
• coding-agent-implement-plan
• coding-agent-review-feature

Skills generated later for a specific project should follow that project's domain and naming conventions instead of using the coding-agent- prefix.

The Codex installer does not edit ~/.codex/config.toml, model provider, approval policy, sandbox mode, auth, telemetry, MCP servers, or hooks.

Skills are installed directly so they work immediately. The plugin is also made available in the personal marketplace for the Codex plugin UI and sharing flow.

opencode

• Managed global guidance block in ~/.config/opencode/AGENTS.md
• opencode.json with safe default permissions
• 9 global skills using the same coding-agent-* prefix
• 8 global commands: /init-existing, /init-new, /skill-new, /brainstorm, /plan, /implement, /implement-plan, /review
• Language overlay for the Communication section

Antigravity

• Native Antigravity plugin with plugin.json, skills/, and rules/
• App/editor plugin path: ~/.gemini/config/plugins/coding-agent-kit/
• CLI plugin path: ~/.gemini/antigravity-cli/plugins/coding-agent-kit/
• 9 plugin skills using platform-native names such as scan-project, write-plan, implement-task, and implement-plan
• Language overlay for the plugin rule's Communication section

The Antigravity installer does not edit settings, hooks, sidecars, MCP, permissions, sandbox, model, auth, telemetry, or provider configuration.

Claude

• Managed global guidance block in ~/.claude/CLAUDE.md
• Native Claude Code skills-directory plugin at ~/.claude/skills/coding-agent-kit/
• 9 plugin skills exposed through the coding-agent-kit namespace
• Language overlay for the Communication section

The Claude installer does not edit settings, hooks, monitors, MCP, permissions, sandbox, model, auth, telemetry, or provider configuration.

Requirements

• Node.js 18+
• Codex app, IDE extension, or CLI for the codex target
• opencode installed for the opencode target
• Antigravity app/editor or CLI for the antigravity target
• Claude Code CLI, app, or IDE extension for the claude target

Install

npm install -g coding-agent-kit

Install for Codex:

coding-agent-kit install --target codex

Install for opencode:

coding-agent-kit install --target opencode

Install for Antigravity:

coding-agent-kit install --target antigravity

Install for Claude Code:

coding-agent-kit install --target claude

Preview changes without writing files:

coding-agent-kit install --target codex --dry-run

Commands

coding-agent-kit install --target <opencode|codex|antigravity|claude>
coding-agent-kit update --target <opencode|codex|antigravity|claude>
coding-agent-kit uninstall --target <opencode|codex|antigravity|claude>
coding-agent-kit status
coding-agent-kit status --target <opencode|codex|antigravity|claude>
coding-agent-kit lang <en|vi|ja|ko|zh|es|fr|de> --target <opencode|codex|antigravity|claude>
coding-agent-kit help

Options:

--lang <en|vi|ja|ko|zh|es|fr|de>
--target <opencode|codex|antigravity|claude>
--dry-run
--force

--force replaces conflicting managed destinations where supported. Use it only when an existing coding-agent-kit destination is not marked as managed but you still want the kit to overwrite it.

Language

The Communication section can be set independently from the rest of the kit:

| Code | Language | |---|---| | en | English (default) | | vi | Tiếng Việt | | ja | 日本語 | | ko | 한국어 | | zh | 中文（简体） | | es | Español | | fr | Français | | de | Deutsch |

Examples:

coding-agent-kit install --target codex --lang vi
coding-agent-kit install --target opencode --lang ja
coding-agent-kit install --target antigravity --lang vi
coding-agent-kit install --target claude --lang vi

coding-agent-kit lang ko --target codex
coding-agent-kit lang en --target opencode
coding-agent-kit lang vi --target antigravity
coding-agent-kit lang vi --target claude

Everything else stays in English so the technical instructions remain easy to maintain and extend.

Codex Workflow

Existing Project

cd your-project
codex

Then ask Codex to use:

$coding-agent-scan-project

It scans the codebase and creates or updates:

• docs/architecture.md
• docs/conventions.md
• docs/flows.md
• docs/plans/
• project AGENTS.md
• optional repo-scoped skills under .agents/skills/ after confirmation

It does not create .opencode/ files or project .codex/config.toml unless you explicitly ask for a config change.

New Project

Use:

$coding-agent-setup-project

The skill gathers requirements, proposes a stack and structure, waits for confirmation, scaffolds the project, then runs the project scan workflow.

Feature Workflow

$coding-agent-brainstorm-feature
$coding-agent-write-plan

Choose one implementation mode after the plan is approved:

• $coding-agent-implement-task handles one task at a time and stops for a review checkpoint. This is the safer default.
• $coding-agent-implement-plan handles all remaining tasks sequentially, verifies each one, then stops before the final review.

After implementation, run the final review:

$coding-agent-review-feature

opencode Workflow

Existing Project

cd your-project
opencode
/init-existing

New Project

mkdir my-project && cd my-project
opencode
/init-new

Feature Workflow

/brainstorm
/plan

Use /implement for one task at a time. Use /implement-plan only when the plan is clear and you want all remaining tasks completed in one run. After either implementation mode, run the final review:

/review

Antigravity Workflow

After installing:

coding-agent-kit install --target antigravity

Restart Antigravity or start a new Antigravity CLI session. Use the plugin skills by their native names:

scan-project
setup-project
brainstorm-feature
write-plan
implement-task
implement-plan
review-feature

Use implement-task for one task at a time. Use implement-plan only when the plan is clear and you want all remaining tasks completed in one run. Then run the review skill.

The scan workflow creates or updates project docs and .agents/rules/project-guidance.md. It does not edit Antigravity settings, hooks, sidecars, MCP, permissions, sandbox, auth, telemetry, model, or provider configuration unless you explicitly ask for that.

Claude Workflow

After installing:

coding-agent-kit install --target claude

Restart Claude Code or start a new session. Use namespaced plugin skills:

/coding-agent-kit:scan-project
/coding-agent-kit:setup-project
/coding-agent-kit:brainstorm-feature
/coding-agent-kit:write-plan
/coding-agent-kit:implement-task
/coding-agent-kit:implement-plan
/coding-agent-kit:review-feature

Use /coding-agent-kit:implement-task for one task at a time. Use /coding-agent-kit:implement-plan only when the plan is clear and you want all remaining tasks completed in one run. Then run the review skill.

The scan workflow creates or updates project docs and CLAUDE.md. It does not edit Claude settings, hooks, monitors, MCP, permissions, sandbox, auth, telemetry, model, or provider configuration unless you explicitly ask for that.

Existing Codex Setups

The Codex installer is designed for machines that already have Codex configured.

• Existing ~/.codex/AGENTS.md content is preserved.
• If ~/.codex/AGENTS.md already has content, the CLI previews the change and asks whether to append the managed block, overwrite the file, or cancel.
• Existing content is preserved by default; overwriting requires an explicit choice.
• The kit writes only the block between: <!-- CODING_AGENT_KIT_START ... --> and <!-- CODING_AGENT_KIT_END -->.
• Existing custom skills are not overwritten unless they contain the kit marker or you pass --force.
• Existing marketplace metadata is preserved; the plugin entry is appended or updated by name.
• If the codex command is available, the CLI asks whether to install or refresh the Codex plugin record automatically.
• Codex may need a restart or new session to load new global guidance, skills, or plugin metadata.

Plugin install from the command line:

codex plugin add coding-agent-kit@personal

Use this when you use the codex command and want the plugin to appear as installed/enabled there. Codex app and IDE extension users can use the direct personal skills installed by coding-agent-kit install --target codex.

Update

status reports the current package version, the latest npm version when it can be checked, installed file versions, and stale managed files:

coding-agent-kit status
coding-agent-kit status --target codex

If a newer npm package is available, update the package first, then refresh the installed platform files:

npm update -g coding-agent-kit
coding-agent-kit update --target codex
coding-agent-kit update --target opencode

For Codex, update refreshes the managed AGENTS block, managed skills, local plugin files, and marketplace entry.

When the codex command is available, update asks whether to refresh the Codex plugin record. If that step is skipped, refresh it later with:

codex plugin add coding-agent-kit@personal

For opencode, update refreshes the managed AGENTS block, skills, commands, and merges new opencode.json keys without overwriting existing keys.

For Antigravity, update refreshes only the selected coding-agent-kit plugin files under the app/editor and/or CLI plugin paths.

For Claude, update refreshes the managed CLAUDE.md block and the coding-agent-kit skills-directory plugin.

Uninstall

coding-agent-kit uninstall --target codex
coding-agent-kit uninstall --target opencode
coding-agent-kit uninstall --target antigravity
coding-agent-kit uninstall --target claude

Preview removal without deleting files:

coding-agent-kit uninstall --target codex --dry-run

uninstall removes only files and blocks marked as managed by coding-agent-kit.

• Codex: removes the managed AGENTS block, managed skills, local plugin files, marketplace entry, and can remove the Codex plugin record when the codex command is available.
• opencode: removes the managed AGENTS block, managed skills, and managed commands.
• Antigravity: removes selected managed plugin directories only.
• Claude: removes the managed CLAUDE.md block and managed plugin directory.
• opencode.json is preserved by default because it may contain user changes.

Kit Structure

kit/
├── platforms/
│   ├── opencode/         # opencode kit files
│   ├── codex/            # Codex AGENTS source and plugin bundle
│   ├── antigravity/      # Antigravity plugin bundle
│   └── claude/           # Claude CLAUDE.md source and plugin bundle
└── shared/
    └── overlays/         # Communication language overlays

New agent targets should be added under kit/platforms/<target>/. Shared files should stay under kit/shared/ only when more than one target uses them.

See kit/README.md for details.

License

MIT - see LICENSE.

Support