Claude Skills Guide

Claude Code Permission Denied When Executing Skill Commands

Permission denied errors when executing skill commands in Claude Code can stop your workflow dead in its tracks. Whether you’re running the tdd skill for test-driven development, using pdf to manipulate documents, or executing any custom skill you’ve installed, understanding why these errors occur and how to fix them is essential for maintaining productivity.

This guide covers the most common causes of permission denied errors when executing skill commands and provides actionable solutions you can implement immediately.

Understanding the Error Messages

When Claude Code refuses to execute a skill command, the error message typically reveals the underlying cause. Here are the most common variations you’ll encounter:

Error: EACCES: permission denied, open '/Users/username/.claude/skills/my-skill/script.sh'
SkillExecutionError: permission denied — command rejected by execution policy
bash: ./script.sh: Permission denied

Each of these messages points to a different layer of the permission system. Identifying which layer is blocking execution is the first step toward resolution.

Common Causes and Solutions

1. File System Permission Issues

The most frequent cause of permission denied errors is incorrect file permissions on skill files or scripts that the skill attempts to execute.

Diagnosis: Check the file permissions using the ls -la command:

ls -la ~/.claude/skills/

Look for files that show permissions like -rw-r--r-- instead of -rwxr-xr-x for executables, or -rw------- which restricts read access.

Solution: Fix permissions using chmod:

# Make a script executable
chmod +x ~/.claude/skills/your-skill/script.sh

# Fix directory permissions
chmod 755 ~/.claude/skills/your-skill/

# Fix file ownership if needed
chown $USER:staff ~/.claude/skills/your-skill/script.sh

For skills that use Python scripts—like those in the pdf skill or xlsx skill—ensure Python files have appropriate permissions:

chmod 644 *.py
chmod 755 your_script.py

2. Skill Command Execution Policy

Claude Code includes a security sandbox that controls which commands skills can execute. If a skill attempts to run a command outside its allowed scope, you’ll receive a permission denied error.

Diagnosis: Run Claude Code with verbose logging to see which policy is being enforced:

claude --verbose /path/to/project

Look for messages about sandbox policies or execution restrictions.

Solution: Modify your skill’s configuration to specify allowed commands. Create or update the skill.md file with explicit execution permissions:

---
name: my-custom-skill
description: A skill for project automation
---

When running commands, use git, npm, node, and python3 only.
Ask for confirmation before running shell commands that modify files.

Skills do not have execution:, allowed_commands:, or require_approval: fields. These controls are not part of the skill file format. Instead, write your permission requirements as natural language instructions in the skill’s Markdown body.

For the supermemory skill or other skills that manage external resources, you may need to explicitly grant file system access:

Only read files from ~/projects/ and ~/documents/.
Only write files to ~/projects/*/output/ directories.

These restrictions go in the skill’s Markdown body as instructions — not as YAML configuration fields.

3. Missing Dependencies in PATH

When executing skill commands that rely on external tools, Claude Code needs access to those tools through the system PATH. If a required executable isn’t found, you may see a permission-like error.

Diagnosis: Check which PATH variables are available to Claude Code:

echo $PATH
claude:exec $PATH

Compare this with the PATH available in your terminal.

Solution: Ensure the skill specifies full paths to executables, or configure your shell environment to include all necessary paths. For skills like frontend-design that invoke Node.js tools:

# Set PATH before launching Claude Code
export PATH="/usr/local/bin:/opt/homebrew/bin:$HOME/.nvm/versions/node/current/bin:$PATH"
claude

Skills do not have execution: or env: configuration fields — PATH and environment variables are set in your shell before launching Claude Code, not within skill files.

4. Container and Sandbox Restrictions

If you’re running Claude Code inside a container (using the docker skill or similar), the container’s security policies may prevent certain command executions.

Diagnosis: Check container logs for SELinux or AppArmor denials:

docker logs container_name 2>&1 | grep -i denied

Solution: Update your container configuration to allow necessary operations:

# Add to your Dockerfile
RUN chmod 755 /usr/local/bin/*
RUN usermod -aG docker $USER

Or adjust the docker run command:

docker run --cap-add=SYS_ADMIN --security-opt seccomp=unconfined \
  -v /path/to/skills:/root/.claude/skills \
  your-claude-image

5. Skill Installation Directory Issues

Installing skills in non-standard locations can lead to permission problems, especially on systems with multiple users or strict directory permissions. Understanding what skills can and cannot access on disk helps you configure installation paths correctly from the start.

Diagnosis: Verify the skill installation directory exists and is accessible:

ls -la ~/.claude/skills/
ls -la /usr/local/share/claude/skills/ 2>&1

Solution: Reinstall the skill in your user directory:

# Remove from system location
sudo rm -rf /usr/local/share/claude/skills/problematic-skill

# Install to user directory
git clone git@github.com:username/problematic-skill.git ~/.claude/skills/problematic-skill

For organizational skills that need to be shared, consider setting up a proper multi-user configuration:

sudo chgrp -R staff /usr/local/share/claude/skills/
sudo chmod -R 775 /usr/local/share/claude/skills/

Prevention Strategies

Keep Skills Updated

Outdated skills may reference deprecated APIs or use deprecated permission patterns. Regularly update your skills:

cd ~/.claude/skills/your-skill
git pull origin main

Use Version Control for Skill Development

When creating custom skills, use the skill-md format with proper YAML front matter:

---
name: my-productivity-skill
description: Automates daily development tasks
---

Test Skills in Isolated Environments

Before deploying a new skill to your main workflow, test it in a project directory where you can verify its behavior:

mkdir /tmp/claude-skill-test
cd /tmp/claude-skill-test
claude "Use the my-new-skill to do X"

This isolation ensures any permission issues are caught before affecting your production work.

Quick Reference Checklist

When you encounter a permission denied error, work through these items in order:

  1. Verify file permissions with ls -la
  2. Check if the file has the execute bit set
  3. Confirm the skill’s YAML configuration is valid
  4. Ensure required dependencies are in PATH
  5. Check container security policies if applicable
  6. Verify the skill is installed in an accessible location
  7. Review Claude Code’s execution logs for policy violations

Conclusion

Permission denied errors in Claude Code skill execution usually stem from file permissions, sandbox policies, or PATH configuration. By systematically diagnosing which layer is causing the block, you can apply the appropriate fix and get back to productive work.

Whether you’re using the tdd skill for test-driven development workflows, the pdf skill for document automation, or building custom skills with supermemory for context management, understanding these permission mechanics ensures your skills run smoothly.

For persistent issues, checking the skill’s documentation and ensuring it was built for the current Claude Code version will often reveal version-specific requirements.

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