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Create and manage skill entities in the agent-harness workspace. Use when the user wants to add a new skill, understand how skills work across providers, or generate provider skill artifacts from a canonical source.
Installer avec Codex ou Claude Copiez ce prompt, collez-le dans Codex, Claude ou un autre assistant, puis laissez-le vérifier la page du skill et l'installer pour vous.
Basé sur la classification professionnelle SOC
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Create and manage lifecycle hook entities in the agent-harness workspace. Covers canonical event authoring, provider projection (Claude Code, GitHub Copilot, OpenAI Codex CLI, Cursor), mode behavior, handler types, the full event/provider support matrix, copy-paste recipes, and common diagnostics.
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| name | harness-skill |
| description | Create and manage skill entities in the agent-harness workspace. Use when the user wants to add a new skill, understand how skills work across providers, or generate provider skill artifacts from a canonical source. |
You are helping the user create or manage a skill entity in the agent-harness workspace. Skills are reusable slash commands and procedural capabilities defined once in .harness/src/ and rendered into every enabled provider's native format by npx harness apply.
Follow the steps and reference material below to complete the user's request.
A skill entity is the canonical source for a reusable, invocable capability. Define it once in .harness/src/skills/<skill-id>/ and harness generates the matching artifacts for every enabled provider (Claude Code, OpenAI Codex, GitHub Copilot). This means one source of truth drives slash commands in all three tools.
.harness/src/skills/<skill-id>/
├── SKILL.md # Main instructions (required)
├── reference.md # Optional supplementary docs
├── examples/ # Optional example files
└── scripts/ # Optional scripts referenced in SKILL.md
SKILL.md is the only required file. Any additional files in the directory are copied alongside it into each provider's output directory.
# 1. Scaffold the skill source directory
npx harness add skill <skill-id>
# 2. Edit .harness/src/skills/<skill-id>/SKILL.md
# (and any supporting files)
# 3. Generate provider artifacts
npx harness apply
# 4. To remove
npx harness remove skill <skill-id>
After npx harness apply, provider artifacts are written to the paths described below. Commit both .harness/src/ and the generated provider files.
Output path: .claude/skills/<skill-id>/SKILL.md (plus any supporting files)
Invocation: /<skill-id> in a Claude Code session
Discovery: Claude Code scans .claude/skills/ in the project root and in every subdirectory up to the repo root (supports monorepos). Personal skills live at ~/.claude/skills/<skill-id>/.
How it works: The SKILL.md content becomes the prompt Claude receives when the skill is invoked. Claude also loads skill descriptions into context so it can invoke matching skills automatically unless disable-model-invocation: true is set.
Frontmatter fields supported:
| Field | Required | Notes |
|---|---|---|
name | No | Defaults to directory name. Lowercase, hyphens only, max 64 chars. |
description | Recommended | Used by Claude to decide when to auto-invoke. |
argument-hint | No | Autocomplete hint, e.g. [filename]. |
disable-model-invocation | No | true = only user can invoke via /skill-id. |
user-invocable | No | false = hidden from / menu, Claude-only. |
allowed-tools | No | Tools permitted without per-use approval. |
model | No | Model override for this skill. |
effort | No | low, medium, high, or max. |
context | No | fork to run in an isolated subagent. |
agent | No | Subagent type when context: fork is set. |
hooks | No | Lifecycle hooks scoped to this skill. |
Argument substitution: Use $ARGUMENTS for all passed args, $ARGUMENTS[N] or $N for positional args, ${CLAUDE_SKILL_DIR} for the skill directory path, ${CLAUDE_SESSION_ID} for the session ID.
Dynamic context: !`<shell-command>` in the skill body runs the command before Claude sees the prompt; the output is injected inline.
Official docs: https://code.claude.com/docs/en/slash-commands
.codex/skills/<skill-id>/SKILL.md (plus any supporting files).codex/skills/ and .agents/skills/ from $CWD up to the repo root. Personal skills live at ~/.agents/skills/ (preferred) or ~/.codex/skills/ (deprecated). Harness writes to .codex/skills/ at the project level./skills or $ to mention a skill by name. Codex also selects skills implicitly based on the task description unless allow_implicit_invocation: false is set.name and description are the primary fields. An optional agents/openai.yaml sidecar in the skill directory can set policy.allow_implicit_invocation, display metadata, and tool dependencies.Output path: .github/skills/<skill-id>/SKILL.md (plus any supporting files)
Discovery: Copilot scans .github/skills/, .claude/skills/, and .agents/skills/ for project skills. Personal skills live at ~/.copilot/skills/, ~/.claude/skills/, or ~/.agents/skills/. Works in Copilot coding agent, Copilot CLI, and agent mode in VS Code. Harness writes to .github/skills/ to avoid duplication across the scanned paths.
Invocation: Copilot automatically determines when to use a skill based on context. When activated, the full SKILL.md is injected into the agent's context. In VS Code, skills also appear as /<skill-name> slash commands.
How it works: Skills supplement custom instructions (.github/copilot-instructions.md). Use custom instructions for broad coding standards; use skills for detailed, task-specific procedures Copilot should only load when relevant.
Frontmatter fields supported:
| Field | Required | Notes |
|---|---|---|
name | Yes | Unique lowercase identifier matching the directory name (max 64 chars). |
description | Yes | What the skill does and when Copilot should use it (max 1024 chars). |
argument-hint | No | Hint text for slash command invocation (VS Code). |
disable-model-invocation | No | true = Copilot won't auto-load this skill (VS Code). |
user-invocable | No | false = hidden from / menu (VS Code). |
license | No | Applicable licensing terms (coding agent). |
Official docs: https://docs.github.com/en/copilot/how-tos/use-copilot-agents/coding-agent/create-skills
Output path: .cursor/skills/<skill-id>/SKILL.md (plus any supporting files)
Discovery: Cursor loads skills from .agents/skills/, .cursor/skills/, and ~/.cursor/skills/. For compatibility, it also scans .claude/skills/, .codex/skills/, ~/.claude/skills/, and ~/.codex/skills/. Harness writes to .cursor/skills/ at the project level.
Invocation: / followed by the skill name in Agent chat, or automatic when the agent determines the skill is relevant.
How it works: Cursor discovers skills at startup and presents them to the agent. The agent decides when they are relevant based on context. Skills can also include scripts/, references/, and assets/ subdirectories for supporting files.
Frontmatter fields supported:
| Field | Required | Notes |
|---|---|---|
name | Yes | Must match the parent folder name. Lowercase letters, numbers, and hyphens only. |
description | Yes | Used by the agent to determine relevance. |
license | No | License name or reference. |
compatibility | No | Environment requirements. |
metadata | No | Arbitrary key-value mapping. |
disable-model-invocation | No | true = only included when explicitly invoked via /skill-name. |
Official docs: https://docs.cursor.com/agent/skills
| Aspect | Claude Code | Codex CLI | GitHub Copilot | Cursor |
|---|---|---|---|---|
| Output root | .claude/skills/ | .codex/skills/ | .github/skills/ | .cursor/skills/ |
| Invocation | /<skill-id> | /skills or $mention | Automatic on context match | /<skill-id> or automatic |
| Auto-invoke | Yes (opt-out via frontmatter) | Yes (opt-out via openai.yaml) | Yes (opt-out via frontmatter in VS Code) | Yes (opt-out via disable-model-invocation) |
| Frontmatter richness | Extensive (11+ fields) | Minimal (name, description) | Moderate (name, description, plus VS Code fields) | Moderate (name, description, plus 4 optional fields) |
| Argument passing | $ARGUMENTS, $N placeholders | Not specified | Not applicable | Not specified |
| Subagent execution | context: fork | Not applicable | Not applicable | Not applicable |
| Supporting files | Fully supported | Supported (scripts/, references/) | Supported | Supported (scripts/, references/, assets/) |
A SKILL.md is a Markdown file with optional YAML frontmatter. Write it as an actionable prompt — describe what Claude (or the provider) should do when the skill is invoked.
Structure:
---
name: my-skill
description: One sentence on what this skill does and when to use it.
disable-model-invocation: true # optional: only if user-triggered only
argument-hint: "[target-file]" # optional
---
# my-skill
Brief summary of the skill's purpose.
## Steps
1. First action
2. Second action
3. ...
## Notes
Any caveats or prerequisites.
Content tips:
$ARGUMENTS placeholder where user input should appear.SKILL.md under 500 lines; move large reference material to separate files in the directory and link them from SKILL.md.description frontmatter field is the most important — it determines when providers auto-invoke the skill. Make it specific.Directory layout:
.harness/src/skills/run-tests/
└── SKILL.md
.harness/src/skills/run-tests/SKILL.md:
---
name: run-tests
description: Run the test suite for the current project and summarize failures. Use when the user asks to run tests, check test results, or debug a failing test.
---
Run the project test suite and report results.
1. Detect the test runner (check package.json scripts, Makefile, or pyproject.toml).
2. Run the tests: `$ARGUMENTS` (use this as extra flags if provided, otherwise omit).
3. Parse the output and list any failures with file name and line number.
4. Suggest a fix for the first failing test if the cause is clear.
After npx harness apply this produces:
.claude/skills/run-tests/SKILL.md — invoked as /run-tests in Claude Code.codex/skills/run-tests/SKILL.md — available via $run-tests in Codex.github/skills/run-tests/SKILL.md — auto-loaded by Copilot when tests are relevantnpx harness add skill <skill-id> # scaffold .harness/src/skills/<skill-id>/SKILL.md
npx harness apply # generate provider skill artifacts for all enabled providers
npx harness plan # dry run: show what apply would write
npx harness remove skill <skill-id> # remove skill entity and source files
npx harness remove skill <skill-id> --no-delete-source # remove from manifest but keep source
npx harness provider enable claude # ensure the claude provider is enabled
npx harness provider enable codex # ensure the codex provider is enabled
npx harness provider enable copilot # ensure the copilot provider is enabled