validate-skills

name	validate-skills
description	Validates Claude Code skills for schema, naming, documentation, and security. Use when user asks to "check my skill", "validate skill syntax", "why isn't my skill loading", "skill errors", or "dangerous command detected". Validates SKILL.md frontmatter, allowed-tools, file references, directory organization, and shell script security.
version	1.0.0
argument-hint	[flags]
allowed-tools	["Bash(claudelint:*)","Read"]

Validate Claude Code Skills

Runs claudelint validate-skills to validate Claude Code skill directories.

Usage

claudelint validate-skills $ARGUMENTS

Options

• --path <path> - Custom path to skills directory
• --skill <name> - Validate specific skill
• --verbose - Show detailed output
• --warnings-as-errors - Treat warnings as errors

Examples

Example 1: Skill appears in slash menu but won't execute

User says: "I see my skill /deploy-app in the menu but when I run it, Claude says it can't find it" What happens:

1. Checks directory name is deploy-app/ but SKILL.md has name: deployApp
2. Shows mismatch: directory uses kebab-case, frontmatter uses camelCase
3. Explains skill names must match directory name exactly
4. Shows fix: change frontmatter to name: deploy-app

Result: Skill executes correctly after fixing name mismatch

Example 2: Claude won't use Bash tool even though it's needed

User says: "My skill script.sh needs to run bash commands but Claude says 'Tool Bash not allowed'" What happens:

1. Checks SKILL.md frontmatter has allowed-tools: ["bash", "read"]
2. Shows tool names are case-sensitive - found lowercase "bash" instead of "Bash"
3. Lists all valid tool names with correct capitalization
4. Shows fix: allowed-tools: ["Bash", "Read"]

Result: Claude can now execute bash commands in the skill

Example 3: Skill validation blocks git commit with "dangerous command"

User says: "Pre-commit hook is failing on my cleanup skill with 'dangerous command detected: rm -rf'" What happens:

1. Scans cleanup.sh script, finds rm -rf $TEMP_DIR
2. Flags it because $TEMP_DIR could be empty or / (dangerous)
3. Suggests safer alternative: validate directory first, use explicit path
4. Shows fixed version: [[ -n "$TEMP_DIR" && "$TEMP_DIR" != "/" ]] && rm -rf "$TEMP_DIR"

Result: Skill now validates paths before deletion, commit succeeds

Command Examples

Validate all skills:

claudelint validate-skills

Validate specific skill:

claudelint validate-skills --skill my-skill

What Gets Validated

Required Fields

• name field must match directory name
• description must be present
• Name must be kebab-case (lowercase with hyphens)
• Name must not exceed 64 characters

allowed-tools Validation

• Must be an array
• Warns for unknown tools
• Accepts: Bash, Read, Write, Edit, Grep, Glob, LSP, WebFetch, WebSearch, etc.

Model Validation

• Validates model field if present
• Accepted values: sonnet, opus, haiku

File References

• Checks that referenced files in SKILL.md exist
• Validates relative paths

Directory Organization

• Warns if skill has >10 loose files (suggest subdirectories)
• Warns if directory nesting >3 levels deep

Documentation

• Warns if CHANGELOG.md is missing
• Warns if SKILL.md lacks usage examples (no code blocks)
• Warns if multi-file skill (>3 scripts) lacks README.md
• Warns if skill lacks version field

Best Practices

• Warns if shell scripts lack shebang (#!/bin/bash)
• Warns if scripts have no explanatory comments
• Detects inconsistent naming conventions

Security

• Errors for dangerous commands (rm -rf /, dd, mkfs)
• Warns for eval/exec usage
• Warns for path traversal patterns

Exit Codes

• 0 - No errors or warnings
• 1 - Warnings found
• 2 - Errors found

For troubleshooting, see common issues. For customization, see configuration.

See Also

• validate-all - Run all validators
• optimize-cc-md - Optimize CLAUDE.md files