fvadicamo
Registry indexed
creating-skills
Guide for creating Claude Code skills following Anthropic's official best practices. Use when user wants to create a new skill, build a skill, write SKILL.md, update an existing skill, or needs skill creation guidelines. Provides structure, frontmatter fields, naming conventions,
Overview
Guide for creating Claude Code skills following Anthropic's official best practices. Use when user wants to create a new skill, build a skill, write SKILL.md, update an existing skill, or needs skill creation guidelines. Provides structure, frontmatter fields, naming conventions, and new features like dynamic context injection and subagent execution.
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Creating skills
Guide for creating Claude Code skills following Anthropic's official best practices.
Quick start
# 1. Create skill directory
mkdir -p ~/.claude/skills/<skill-name>
# 2. Create SKILL.md with frontmatter
cat > ~/.claude/skills/<skill-name>/SKILL.md << 'EOF'
---
name: <skill-name>
description: <What it does>. Use when <trigger phrases>. <Key capabilities>.
---
# <Skill title>
<Instructions for the skill workflow>
EOF
# 3. Add optional resources as needed
mkdir -p ~/.claude/skills/<skill-name>/{scripts,references,assets}
SKILL.md structure
Frontmatter (YAML between --- markers)
| Field | Required | Description |
|---|---|---|
name | No | Display name. Defaults to directory name. Lowercase, hyphens, max 64 chars. |
description | Recommended | What + when + capabilities. Max 1024 chars. Determines when Claude activates the skill. |
allowed-tools | No | Tools Claude can use without asking permission when skill is active. |
argument-hint | No | Autocomplete hint for arguments. Example: [issue-number] |
disable-model-invocation | No | true to prevent auto-invocation (manual /name only). |
user-invocable | No | false to hide from / menu (background knowledge only). |
model | No | Model override when skill is active. |
context | No | fork to run in isolated subagent context. |
agent | No | Subagent type when context: fork. Built-in: Explore, Plan, general-purpose. |
hooks | No | Lifecycle hooks scoped to this skill. |
Invocation control matrix
| Configuration | User can invoke | Claude can invoke |
|---|---|---|
| (defaults) | Yes | Yes |
disable-model-invocation: true | Yes | No |
user-invocable: false | No | Yes |
Description formula
<What it does>. Use when <trigger phrases>. <Key capabilities>.
Include action verbs ("create", "handle"), user intent ("wants to", "needs to"), and domain keywords users would say.
Directory structure
skill-name/
├── SKILL.md # Required: instructions (keep under 500 lines)
├── scripts/ # Optional: executable code (deterministic, token-efficient)
├── references/ # Optional: docs loaded into context on demand
└── assets/ # Optional: files used in output, NOT loaded into context
# (templates, images, fonts, boilerplate)
Progressive disclosure (3-level loading)
- Metadata (name + description) - always in context (~100 tokens per skill)
- SKILL.md body - loaded when skill triggers (keep under 5k words)
- Bundled resources - loaded as needed by Claude
Reference supporting files from SKILL.md so Claude knows they exist. Keep references one level deep. For files over 100 lines, include a table of contents.
Scripts vs references vs assets
| Type | Purpose | Loaded into context? |
|---|---|---|
scripts/ | Deterministic operations, complex processing | No (executed via bash) |
references/ | Documentation Claude reads while working | Yes, on demand |
assets/ | Templates, images, fonts for output | No (copied/used in output) |
Only create scripts when they add value: complex multi-step processing, repeated code generation, deterministic reliability. Not for single-command wrappers.
Dynamic features
Context injection
Inject shell command output into skill content before loading:
## Recent commits
!`git log --oneline -5 2>/dev/null`
The output replaces the directive when the skill loads.
String substitutions
Pass arguments to skills invoked via /skill-name arg1 arg2:
| Variable | Value |
|---|---|
$ARGUMENTS | Full argument string |
$ARGUMENTS[0], $ARGUMENTS[1] | Individual arguments |
$1, $2 | Shorthand for $ARGUMENTS[N] |
Subagent execution
Run a skill in isolated context with context: fork:
---
name: deep-research
description: Research a topic thoroughly.
context: fork
agent: Explore
---
Degrees of freedom
Match specificity to the task's fragility:
| Level | When to use | Example |
|---|---|---|
| High (text instructions) | Multiple valid approaches, context-dependent | "Analyze the code and suggest improvements" |
| Medium (pseudocode/scripts with params) | Preferred pattern exists, some variation OK | Script with configurable parameters |
| Low (specific scripts, few params) | Fragile operations, consistency critical | Exact sequence of API calls |
Naming conventions
- Lowercase, hyphens between words, max 64 chars
- Styles: gerund (
processing-pdfs), noun phrase (github-pr-creation), prefixed group (github-pr-*)
Important rules
- ALWAYS write descriptions that include WHAT + WHEN triggers + capabilities
- ALWAYS keep SKILL.md under 500 lines, split to references when approaching
- ALWAYS reference bundled files from SKILL.md so Claude discovers them
- NEVER duplicate info between SKILL.md and reference files
- NEVER create wrapper scripts for single commands
- NEVER include extraneous files (README.md, CHANGELOG.md, INSTALLATION_GUIDE.md, QUICK_REFERENCE.md)
- NEVER explain things Claude already knows (standard libraries, common tools, basic patterns)
References
references/official_best_practices.md- Principles, anti-patterns, quality checklist, testingreferences/skill_examples.md- Concrete skill examples with new features
File metadata
name: creating-skills description: Guide for creating Claude Code skills following Anthropic's official best practices. Use when user wants to create a new skill, build a skill, write SKILL.md, update an existing skill, or needs skill creation guidelines. Provides structure, frontmatter fields, naming conventions, and new features like dynamic context injection and subagent execution.
View original text
---
name: creating-skills
description: Guide for creating Claude Code skills following Anthropic's official best practices. Use when user wants to create a new skill, build a skill, write SKILL.md, update an existing skill, or needs skill creation guidelines. Provides structure, frontmatter fields, naming conventions, and new features like dynamic context injection and subagent execution.
---
# Creating skills
Guide for creating Claude Code skills following Anthropic's official best practices.
## Quick start
```bash
# 1. Create skill directory
mkdir -p ~/.claude/skills/<skill-name>
# 2. Create SKILL.md with frontmatter
cat > ~/.claude/skills/<skill-name>/SKILL.md << 'EOF'
---
name: <skill-name>
description: <What it does>. Use when <trigger phrases>. <Key capabilities>.
---
# <Skill title>
<Instructions for the skill workflow>
EOF
# 3. Add optional resources as needed
mkdir -p ~/.claude/skills/<skill-name>/{scripts,references,assets}
```
## SKILL.md structure
### Frontmatter (YAML between `---` markers)
| Field | Required | Description |
|-------|----------|-------------|
| `name` | No | Display name. Defaults to directory name. Lowercase, hyphens, max 64 chars. |
| `description` | Recommended | What + when + capabilities. Max 1024 chars. Determines when Claude activates the skill. |
| `allowed-tools` | No | Tools Claude can use without asking permission when skill is active. |
| `argument-hint` | No | Autocomplete hint for arguments. Example: `[issue-number]` |
| `disable-model-invocation` | No | `true` to prevent auto-invocation (manual `/name` only). |
| `user-invocable` | No | `false` to hide from `/` menu (background knowledge only). |
| `model` | No | Model override when skill is active. |
| `context` | No | `fork` to run in isolated subagent context. |
| `agent` | No | Subagent type when `context: fork`. Built-in: `Explore`, `Plan`, `general-purpose`. |
| `hooks` | No | Lifecycle hooks scoped to this skill. |
### Invocation control matrix
| Configuration | User can invoke | Claude can invoke |
|---------------|-----------------|-------------------|
| (defaults) | Yes | Yes |
| `disable-model-invocation: true` | Yes | No |
| `user-invocable: false` | No | Yes |
### Description formula
```
<What it does>. Use when <trigger phrases>. <Key capabilities>.
```
Include action verbs ("create", "handle"), user intent ("wants to", "needs to"), and domain keywords users would say.
## Directory structure
```
skill-name/
├── SKILL.md # Required: instructions (keep under 500 lines)
├── scripts/ # Optional: executable code (deterministic, token-efficient)
├── references/ # Optional: docs loaded into context on demand
└── assets/ # Optional: files used in output, NOT loaded into context
# (templates, images, fonts, boilerplate)
```
### Progressive disclosure (3-level loading)
1. **Metadata** (name + description) - always in context (~100 tokens per skill)
2. **SKILL.md body** - loaded when skill triggers (keep under 5k words)
3. **Bundled resources** - loaded as needed by Claude
Reference supporting files from SKILL.md so Claude knows they exist. Keep references one level deep. For files over 100 lines, include a table of contents.
### Scripts vs references vs assets
| Type | Purpose | Loaded into context? |
|------|---------|---------------------|
| `scripts/` | Deterministic operations, complex processing | No (executed via bash) |
| `references/` | Documentation Claude reads while working | Yes, on demand |
| `assets/` | Templates, images, fonts for output | No (copied/used in output) |
Only create scripts when they add value: complex multi-step processing, repeated code generation, deterministic reliability. Not for single-command wrappers.
## Dynamic features
### Context injection
Inject shell command output into skill content before loading:
```markdown
## Recent commits
!`git log --oneline -5 2>/dev/null`
```
The output replaces the directive when the skill loads.
### String substitutions
Pass arguments to skills invoked via `/skill-name arg1 arg2`:
| Variable | Value |
|----------|-------|
| `$ARGUMENTS` | Full argument string |
| `$ARGUMENTS[0]`, `$ARGUMENTS[1]` | Individual arguments |
| `$1`, `$2` | Shorthand for `$ARGUMENTS[N]` |
### Subagent execution
Run a skill in isolated context with `context: fork`:
```yaml
---
name: deep-research
description: Research a topic thoroughly.
context: fork
agent: Explore
---
```
## Degrees of freedom
Match specificity to the task's fragility:
| Level | When to use | Example |
|-------|-------------|---------|
| **High** (text instructions) | Multiple valid approaches, context-dependent | "Analyze the code and suggest improvements" |
| **Medium** (pseudocode/scripts with params) | Preferred pattern exists, some variation OK | Script with configurable parameters |
| **Low** (specific scripts, few params) | Fragile operations, consistency critical | Exact sequence of API calls |
## Naming conventions
- Lowercase, hyphens between words, max 64 chars
- Styles: gerund (`processing-pdfs`), noun phrase (`github-pr-creation`), prefixed group (`github-pr-*`)
## Important rules
- **ALWAYS** write descriptions that include WHAT + WHEN triggers + capabilities
- **ALWAYS** keep SKILL.md under 500 lines, split to references when approaching
- **ALWAYS** reference bundled files from SKILL.md so Claude discovers them
- **NEVER** duplicate info between SKILL.md and reference files
- **NEVER** create wrapper scripts for single commands
- **NEVER** include extraneous files (README.md, CHANGELOG.md, INSTALLATION_GUIDE.md, QUICK_REFERENCE.md)
- **NEVER** explain things Claude already knows (standard libraries, common tools, basic patterns)
## References
- `references/official_best_practices.md` - Principles, anti-patterns, quality checklist, testing
- `references/skill_examples.md` - Concrete skill examples with new features
Review the source
Price & running costs
- Get the skill
- Price unconfirmed
- Run it
- Requirements have not been confirmed. Check the source for agent, API and service charges.
- License
- MIT
- Price unconfirmed
- We have not confirmed a price for this skill. Existing source and install links remain available.
Free to get does not mean free to run. Price labels are not safety ratings. Submit pricing information →
Skill source recorded
Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.
Review before install: Avoid automatic install
License: MIT
- Dependency or permission surface needs review
- Permission surface may require sandboxing
- AI review approval is missing
- Quality score needs review
- Permission surface needs review: secrets or environment access, shell or command execution
- GitHub adoption: 72 GitHub stars
- Stars/forks activity: 72 stars, 6 forks; issue activity unavailable in current metadata
- Dependency/runtime risk: command execution surface, credential or environment access
- Permission surface: secrets or environment access, shell or command execution
- Review status: AI review approval is missing
Listed tools are metadata hints, not tested compatibility. Agent prompts are suggested handoffs.
Start with one small task
- 1Read the source. Confirm the input, expected output, dependencies and permissions.
- 2Ask your agent for a plan. Approve setup and any costs before running a small isolated test.
- 3Check the output and changed files. Report only what actually ran; keep the source revision for reproduction.
Check the source for dependencies, API keys and third-party costs. A public repository does not mean every service is free.
Source & usage notes
IndexedStatic Checked
Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.
- Source repository
- fvadicamo/dev-agent-skills
- License
- MIT
- Version
- 1.0.0
- Last GitHub push
- Sep 6, 2026
- Registry updated
- Sep 8, 2026
Version reported in registry metadata; check source releases before relying on it.
Quality
60/100
Promising
Trust
61/100
Sandbox only
Audit
74/100
Needs review
- Dependency or permission surface needs review
- Permission surface may require sandboxing
- AI review approval is missing
- Quality score needs review
- Permission surface needs review: secrets or environment access, shell or command execution
- GitHub adoption: 72 GitHub stars
- Stars/forks activity: 72 stars, 6 forks; issue activity unavailable in current metadata
- Dependency/runtime risk: command execution surface, credential or environment access
- Permission surface: secrets or environment access, shell or command execution
- Review status: AI review approval is missing
- Verified installs
- —
- Outcomes
- —
Copies are not installs. Installation counts require a reported successful installation; they are not a blanket quality guarantee.
Agent access
This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.
More details
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"skill": {
"slug": "fvadicamo-creating-skills",
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"description": "Guide for creating Claude Code skills following Anthropic's official best practices. Use when user wants to create a new skill, build a skill, write SKILL.md, update an existing skill, or needs skill creation guidelines. Provides structure, frontmatter fields, naming conventions, and new features like dynamic context injection and subagent execution.",
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},
{
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}
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"license": "MIT",
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"Permission surface: secrets or environment access, shell or command execution",
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"GitHub adoption: 72 GitHub stars",
"Stars/forks activity: 72 stars, 6 forks; issue activity unavailable in current metadata",
"Dependency/runtime risk: command execution surface, credential or environment access"
]
},
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"label": "Blocked for auto-install",
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},
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},
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"maintenance": "28d since push",
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"Audit: 74/100 Needs review",
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"Review repository, license, install command, and permission surface before production use."
],
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"selected_skill": "fvadicamo-creating-skills (creating-skills)",
"install_command": "npx skills add fvadicamo/dev-agent-skills --skill creating-skills",
"risk_summary": "Needs review; Blocked for auto-install; Review before production",
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"method": "POST",
"requires_resolve_event_id": true,
"event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
"expected_outcomes": [
"success",
"failed",
"not_relevant",
"blocked_by_risk",
"setup_required"
],
"payload_template": {
"event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
"skill_slug": "fvadicamo-creating-skills",
"task": "Use creating-skills in an agent workflow",
"agent": "codex",
"outcome": "success",
"install_used": true,
"risk_blocked": false,
"setup_required": false,
"task_success": true,
"output_quality": 4,
"error_type": null,
"human_review_required": false,
"workspace": "sandbox",
"time_to_useful_ms": 120000,
"notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
}
},
"endpoints": {
"web": "https://www.openagentskill.com/skills/fvadicamo-creating-skills",
"api": "https://www.openagentskill.com/api/agent/skills/fvadicamo-creating-skills",
"audit": "https://www.openagentskill.com/skills/fvadicamo-creating-skills/audit",
"eval": "https://www.openagentskill.com/api/agent/evals?slug=fvadicamo-creating-skills&task=Use%20creating-skills%20in%20an%20agent%20workflow&max_risk=medium",
"resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20creating-skills%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
"receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20creating-skills%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
"install": "https://www.openagentskill.com/api/skills/fvadicamo-creating-skills/install",
"manifest": "https://www.openagentskill.com/api/registry/manifest/fvadicamo-creating-skills"
}
}For the creator
Listing source
Registry indexed
This listing was indexed from public sources and is not marked official until a maintainer claim is approved.
- Creator
- fvadicamo
- Indexed by
- OpenAgentSkill community index
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[](https://www.openagentskill.com/skills/fvadicamo-creating-skills?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)
[](https://www.openagentskill.com/skills/fvadicamo-creating-skills/audit)
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