skill-forge-convert
Convert Claude Code skills to work on OpenAI Codex, Google Gemini CLI, Google Antigravity, and Cursor. Analyzes platform-specific features, generates target files (openai.yaml, AGENTS.md, GEMINI.md, .mdc rules), adapts frontmatter, converts MCP config, and produces compatibility reports. Use when user says "convert skill", "port skill", "multi-platform", "skill for codex", "skill for gemini", "skill for antigravity", "skill for cursor", "cross-platform skill", "convert to codex", "convert to gemini", "convert to antigravity", or "convert to cursor".
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/agricidaniel/skill-forge --skill skill-forge-convert- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads skill-forge-convert automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Skill Conversion — Multi-Platform
Convert Claude Code skills to work on OpenAI Codex, Google Gemini CLI, Google Antigravity, and Cursor while maintaining quality and following each platform's best practices.
Process
Step 1: Read Source Skill
- Read the source
SKILL.mdand parse frontmatter - Detect skill complexity tier (1-4)
- Inventory all files: scripts/, references/, agents/, sub-skills
- Identify MCP config (
.mcp.json) if present
Step 2: Analyze Platform Compatibility
Run dry-run analysis first:
python scripts/convert_skill.py <path> --dry-run --target all
Review the compatibility report:
- Portable fields: Transfer directly (name, description, license)
- Adaptable fields: Need platform-specific handling
- Claude-only fields: Will be stripped with warnings
Step 3: Convert to Target Platforms
Run the conversion:
python scripts/convert_skill.py <path> --target codex,gemini,antigravity,cursor --output dist/
For MCP config conversion:
python scripts/convert_skill.py <path> --target all --output dist/ --include-mcp
Step 4: Handle Claude-Only Features
Features that need manual adaptation per platform:
| Claude Feature | Codex | Gemini/Antigravity | Cursor |
|---|---|---|---|
allowed-tools | Supported | Remove; all tools available | Remove; no equivalent |
context: fork | No equivalent | No equivalent | No equivalent |
hooks | 1 event (notify) | Partial (CLI) | 6 events (beta) |
model selection | No equivalent | No equivalent | No equivalent |
Task delegation | Break into separate skills | Break into separate skills | Background Agents (Ultra plan) |
/slash commands | $mention syntax | Description-based activation | Description-based + @rule |
| Sub-skill routing | Separate skills with $mention | Separate skills, LLM-routed | Separate skills, LLM-routed |
Step 5: Validate Converted Skills
Run validation on each generated output:
python scripts/validate_skill.py dist/codex/<skill-name>/
python scripts/validate_skill.py dist/gemini/<skill-name>/
python scripts/validate_skill.py dist/antigravity/<skill-name>/
python scripts/validate_skill.py dist/cursor/<skill-name>/
Fix any critical or high-priority issues before proceeding.
Step 6: Generate Deployment Report
Present the user with a summary:
## Conversion Report: {skill-name}
| Platform | Score | Files | Warnings | Manual Steps |
|----------|-------|-------|----------|-------------|
| Codex | 92% | 4 | 2 | 1 |
| Gemini | 88% | 3 | 3 | 1 |
| Antigravity | 88% | 3 | 3 | 1 |
| Cursor | 88% | 3 | 3 | 1 |
### Generated Files
[list per platform]
### Warnings
[list per platform]
### Manual Steps Required
[list per platform]
Step 7: Generate Multi-Platform Install Script
When converting for all platforms (--target all), the script auto-generates
install-multiplatform.sh that:
- Auto-detects the current agent platform
- Installs to the correct skill path
- Supports
--platformflag for explicit selection
Platform Quick Reference
| Platform | Skill Path | Instruction File | Config Format |
|---|---|---|---|
| Claude Code | .claude/skills/ | CLAUDE.md | JSON (.mcp.json) |
| OpenAI Codex | .agents/skills/ | AGENTS.md | TOML (config.toml) |
| Gemini CLI | .gemini/skills/ | GEMINI.md | JSON (settings.json) |
| Antigravity | .agent/skills/ | GEMINI.md | JSON (mcp_config.json) |
| Cursor | .cursor/skills/ | .cursor/rules/*.mdc | JSON (mcp.json) |
For full platform specs, load references/platforms.md.
Tier Conversion Guidelines
- Tier 1 (single SKILL.md): Converts cleanly. Auto-convert recommended.
- Tier 2 (skill + scripts): Converts well. Verify script paths.
- Tier 3 (multi-skill): Partial. Each sub-skill converts independently. Routing needs manual work.
- Tier 4 (ecosystem): Manual review required. Subagent delegation needs platform adaptation.
FAQ
What does the skill-forge-convert skill do?
Convert Claude Code skills to work on OpenAI Codex, Google Gemini CLI, Google Antigravity, and Cursor. Analyzes platform-specific features, generates target files (openai.yaml, AGENTS.md, GEMINI.md, .mdc rules), adapts frontmatter, converts MCP config, and produces compatibility reports. Use when user says "convert skill", "port skill", "multi-platform", "skill for codex", "skill for gemini", "skill for antigravity", "skill for cursor", "cross-platform skill", "convert to codex", "convert to gemini", "convert to antigravity", or "convert to cursor".
How do I install skill-forge-convert?
Run npx skills add https://github.com/agricidaniel/skill-forge --skill skill-forge-convert in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/skill-forge-convert/ (personal) or .claude/skills/skill-forge-convert/ (project).
Which AI agents can use skill-forge-convert?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is skill-forge-convert safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains skill-forge-convert?
It is published by agricidaniel in agricidaniel/skill-forge. It has 39 recorded installs.
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