vudovn/antigravity-kit

AG KIT

Antigravity-first agent engineering kit with rules, skills, specialist agents, workflows, persistent memory, MCP guidance, orchestration, and a native safety hook.

Primary runtime: Google Antigravity
Tiếng Việt · Migration guide · Production checklist · Security

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Production profile

AG Kit installs a complete .agents/ workspace contract. Antigravity is the supported production runtime for this release. Other tools may read the Markdown components, but runtime behavior outside Antigravity is not part of the production compatibility guarantee.

The native hook is deliberately narrow. It blocks root-filesystem deletion, drive formatting, and raw-disk overwrite patterns while allowing normal project cleanup such as deleting dist/ or node_modules/. It does not replace Antigravity permissions, workspace trust, sandboxing, or human approval.

Requirements

• Node.js 22 or newer for repository-level Antigravity tooling.
• Python 3.10 or newer for AG Kit validators and utility scripts.
• A trusted Google Antigravity workspace.
• Git for safe update, review, and rollback workflows.

The published CLI currently supports Node.js 18 or newer; the Antigravity integration checks run on Node.js 22.

Quick start

Install into a project

npx @vudovn/ag-kit init

Or install the CLI globally:

npm install -g @vudovn/ag-kit
ag-kit init

Do not add .agents/ to the project .gitignore when Antigravity needs to index rules, skills, or workflows. To keep it local without disabling discovery, add .agents/ to .git/info/exclude instead.

Verify the workspace

npm run check:agents
npm run check:antigravity
npm run test:antigravity

check:antigravity is read-only. The default MCP example contains YOUR_API_KEY, so the normal doctor reports a warning until the example is configured. Use strict mode only after all placeholders have been resolved:

node .agents/hooks/antigravity-doctor.mjs --strict

Open in Antigravity

After opening the repository as a trusted workspace:

1. Confirm slash commands such as /plan, /coordinate, and /orchestrate are discovered.
2. Confirm relevant skills are selected from .agents/skills/.
3. Run a normal command such as npm test and confirm it is allowed.
4. Verify the safety hook with a mocked payload rather than executing a destructive command:

printf '%s' '{"tool_args":{"CommandLine":"rm -rf /"}}' \
  | node .agents/hooks/validate-tool-call.mjs

The command must exit non-zero and print BLOCKED by AG Kit.

Safe updates and rollback

AG Kit updates are merge-aware. User-owned files and locally modified managed files are preserved by default.

ag-kit update --dry-run          # Preview the exact plan
ag-kit update                    # Merge safely and create a backup
ag-kit update --strategy replace # Explicit full replacement, still backed up
ag-kit rollback                  # Restore the newest pre-update backup

Update metadata is stored in .agents/.ag-kit/. Backups are stored in .ag-kit-backups/ outside the managed toolkit tree. Read MIGRATION.md before upgrading an existing installation to the Antigravity-native release.

Antigravity-native integration

Runtime contract

.agents/antigravity.json declares the six supported integration phases and the documented Antigravity CLI capabilities used by AG Kit. It avoids inventing a minimum semantic version when upstream documentation does not define one.

Native safety hook

Antigravity loads .agents/hooks.json, which registers:

{
  "enabled": true,
  "PreToolUse": [
    {
      "matcher": "run_command",
      "command": "node .agents/hooks/validate-tool-call.mjs",
      "timeout": 10
    }
  ]
}

To temporarily disable the AG Kit hook while diagnosing a compatibility issue, set "enabled": false, reopen the workspace, and report the payload shape privately if it may contain sensitive data. Do not delete Antigravity's own permission controls.

MCP configuration

Review the workspace MCP plan without writing to the home directory:

node .agents/hooks/sync-mcp.mjs --check
node .agents/hooks/sync-mcp.mjs --print

After replacing placeholders, explicitly apply to one supported target:

node .agents/hooks/sync-mcp.mjs --apply --target suite
node .agents/hooks/sync-mcp.mjs --apply --target cli

Existing servers with the same name are preserved unless --force is supplied. A timestamped backup is created before an existing target file is changed. Never commit real MCP credentials.

Build and inspect the plugin

npm run build:antigravity-plugin

Review dist/antigravity-plugin/ before local installation. The bundle contains packaged skills, agents, rules, converted workflow commands, the native hook, an MCP example, and PLUGIN_CONTENTS.json with SHA-256 entries.

agy plugin install ./dist/antigravity-plugin
agy plugin list

Plugin installation is optional; the repository-native .agents/ workspace remains the source of truth for project development.

Included components

Every agent, skill, workflow, and rule has a SemVer contract. .agents/manifest.json, .agents/manifest.lock.json, and .agents/DEPENDENCY_GRAPH.md make the managed toolkit reproducible and detect drift.

npm run generate:agents
npm run check:agents

Common workflows

Release and production gates

A release candidate is not production-approved until all automated checks and the hands-on Antigravity smoke test in PRODUCTION_CHECKLIST.md are complete.

Required GitHub checks:

• Toolkit validation
• CLI tests and package validation
• Web lint, typecheck, build, and audit
• Antigravity native contract
• Dependency Review

AG Kit never requires automatic merge, automatic deployment, or automatic MCP synchronization. Production changes should remain reviewable and reversible.

Documentation

• Antigravity implementation details
• Migration guide
• Production release checklist
• Security policy and runtime threat model
• Agent flow architecture
• Toolkit architecture
• Changelog
• Release setup

References and attribution

AG Kit is an original open-source implementation of Markdown-based agent engineering patterns. No proprietary source files are included. Runtime integration decisions are based on public Antigravity documentation and codelabs linked in .agents/hooks/README.md.

Support the project

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License

Released under the MIT License © Vudovn.