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Paul Bakaus
66630a0ead
- Ship design-parser and refreshed live scripts/document refs across provider skill trees; align live.mjs and live-poll with source - Update build/skills harness metadata, skills CLI test, and devDependencies (AI SDKs, zod) - Gitignore .codex/ harness artifacts and tests/evals-v2/ Made-with: Cursor
87 lines
4.7 KiB
Markdown
87 lines
4.7 KiB
Markdown
# Harness Skills Capabilities Reference
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Source of truth for what each AI coding harness supports in terms of agent skills.
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Used to inform provider configs in `scripts/lib/transformers/providers.js`.
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Last verified: 2026-03-24
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## Official Documentation
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| Harness | Docs URL |
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|---------|----------|
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| Claude Code | https://code.claude.com/docs/en/skills |
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| Cursor | https://cursor.com/docs/context/skills |
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| Gemini CLI | https://geminicli.com/docs/cli/skills/ |
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| Codex CLI | https://developers.openai.com/codex/skills |
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| GitHub Copilot (Agents) | https://code.visualstudio.com/docs/copilot/customization/agent-skills |
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| Kiro | https://kiro.dev/docs/skills/ |
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| OpenCode | https://opencode.ai/docs/skills/ |
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| Pi | https://github.com/badlogic/pi-mono/blob/main/packages/coding-agent/docs/skills.md |
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| Trae | TBD (no official skills docs found yet) |
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| Rovo Dev | https://support.atlassian.com/rovo/docs/extend-rovo-dev-cli-with-agent-skills |
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## Spec Compliance
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All harnesses follow the [Agent Skills specification](https://agentskills.io/specification) to varying degrees. The spec defines these frontmatter fields: `name`, `description`, `license`, `compatibility`, `metadata`, `allowed-tools`.
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Provider-specific extensions beyond the spec: `user-invocable`, `argument-hint`, `disable-model-invocation`, `allowed-tools` (extended syntax), `model`, `effort`, `context`, `agent`, `hooks`, `subtask`, `mcp`.
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## Frontmatter Support
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Fields marked with * are spec-standard. Others are provider extensions.
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| Field | Claude Code | Cursor | Gemini | Codex | Copilot | Kiro | OpenCode | Pi | Rovo Dev |
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|-------|:-----------:|:------:|:------:|:-----:|:-------:|:----:|:--------:|:--:|:--------:|
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| `name`* | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
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| `description`* | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
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| `license`* | Yes | Yes | Ignored | No | Yes | Yes | Yes | Yes | Yes |
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| `compatibility`* | Yes | Yes | Ignored | No | Yes | Yes | Yes | Yes | Yes |
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| `metadata`* | Yes | Yes | Ignored | No | Yes | Yes | Yes | Yes | Yes |
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| `allowed-tools`* | Yes | No | Ignored | No | No | No | Yes | Yes | Yes |
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| `user-invocable` | Yes | No | No | No | Yes | No | Yes | No | Yes |
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| `argument-hint` | Yes | No | No | No | Yes | No | Yes | No | Yes |
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| `disable-model-invocation` | Yes | Yes | No | No | Yes | No | Yes | Yes | TBD |
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| `model` | Yes | No | No | No | No | No | Yes | No | No |
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| `effort` | Yes | No | No | No | No | No | No | No | No |
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| `context` | Yes | No | No | No | No | No | No | No | No |
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| `agent` | Yes | No | No | No | No | No | Yes | No | No |
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| `hooks` | Yes | No | No | No | No | No | No | No | No |
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Notes:
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- Gemini CLI validates only `name` and `description`; other spec fields are parsed but ignored.
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- Codex CLI uses a separate `agents/openai.yaml` sidecar for extended metadata (icons, branding, MCP tools, invocation control).
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- Kiro recognizes `user-invocable` and `disable-model-invocation` per community reports but does not formally document them.
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- Unknown fields are silently ignored by all harnesses.
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## Skill Directory Structure
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| Harness | Native directory | Also reads |
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|---------|-----------------|------------|
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| Claude Code | `.claude/skills/` | - |
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| Cursor | `.cursor/skills/` | `.agents/skills/`, `.claude/skills/` |
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| Gemini CLI | `.gemini/skills/` | `.agents/skills/` |
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| Codex CLI | `.agents/skills/` (primary) | - |
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| GitHub Copilot | `.github/skills/` | `.agents/skills/`, `.claude/skills/` |
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| Kiro | `.kiro/skills/` | - |
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| OpenCode | `.opencode/skills/` | `.agents/skills/`, `.claude/skills/` |
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| Pi | `.pi/skills/` | `.agents/skills/` |
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| Trae China | `.trae-cn/skills/` | TBD |
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| Trae International | `.trae/skills/` | TBD |
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| Rovo Dev | `.rovodev/skills/` | `~/.rovodev/skills/` (user-level) |
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All harnesses support the `{skill-name}/SKILL.md` directory structure with optional `reference/`, `scripts/`, and `assets/` subdirectories.
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## Placeholder / Variable Substitution
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Claude Code supports runtime variable substitution directly in SKILL.md bodies: `$ARGUMENTS`, `$0`-`$N`, `${CLAUDE_SKILL_DIR}`, `${CLAUDE_SESSION_ID}`. No other harness supports substitution in skills.
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Some harnesses have separate "custom commands" systems (distinct from skills) with their own substitution:
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| Harness | Command system | Substitution syntax |
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|---------|---------------|-------------------|
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| Gemini CLI | `.gemini/commands/` (TOML) | `{{args}}`, `!{shell}`, `@{file}` |
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| Codex CLI | `.codex/prompts/` | `$ARGNAME` |
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| OpenCode | `.opencode/commands/` | `$ARGUMENTS`, `$1`-`$N`, `` !`shell` `` |
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Our build system handles cross-provider placeholders at compile time via `replacePlaceholders()` for `{{model}}`, `{{config_file}}`, `{{ask_instruction}}`, and `{{available_commands}}`.
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