Claude Code Write Path Outside — Fix (2026)

The Error

Cannot write file: path is outside the workspace root

The Fix

# Check your current workspace root
pwd
# Ensure the target path is under this directory
# BAD:  /tmp/output.json
# BAD:  ../other-project/file.ts
# GOOD: /Users/you/project/output/result.json
# If you need the file elsewhere, write it inside the workspace first
# then move it manually after Claude finishes

Why This Works

Claude Code restricts file writes to the workspace root directory (the directory where the session was started) as a security boundary. This prevents accidental or malicious writes to system directories, other projects, or sensitive locations. All file operations must target paths that resolve to somewhere inside the workspace tree.

If That Doesn’t Work

# Create a symlink inside your workspace pointing to the target location
ln -s /path/to/external/dir ./external-link
# Or start Claude Code from a parent directory that encompasses both locations
cd /Users/you/projects && claude
# Or use Bash tool to write outside workspace (if permissions allow)
echo "content" > /path/to/external/file.txt

The Bash tool has broader filesystem access than the Write tool, though sandbox mode may still restrict it.

Prevention

Add to your CLAUDE.md:

All generated files must be written inside the project workspace. For outputs needed in external locations, write to a local output/ directory and include a post-processing step to copy them to their final destination.

See Also

This fix also applies if you see these related error messages:

  • SyntaxError: Unexpected token in JSON at position 0
  • JSON.parse: unexpected character at line 1 column 1
  • Error: invalid JSON response from API
  • Error: ENOENT: no such file or directory
  • Cannot resolve path outside workspace

Frequently Asked Questions

Why does JSON parsing fail on API responses?

JSON parse failures on API responses typically indicate a network issue where an intermediate proxy returned an HTML error page instead of JSON. Check the raw response by enabling debug logging with CLAUDE_LOG_LEVEL=debug to see the actual content received.

How do I fix corrupted JSON config files?

Open the file in a text editor and look for common issues: trailing commas, missing quotes, or truncated content (from a crash during write). Use python3 -m json.tool < file.json to validate and identify the exact parse error location.

Can Claude Code handle JSON files with comments?

Standard JSON does not support comments. If your project uses JSONC (JSON with Comments), Claude Code handles it when reading via tools. For configuration files like tsconfig.json that support JSONC, Claude Code strips comments before parsing.

Why does Claude Code reject paths outside the workspace?

Claude Code sandboxes file operations to the current workspace directory for security. Writing to paths outside the project root (like /etc/ or ~/) is blocked by default. This prevents accidental modification of system files or other projects.

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Implementation Details

When working with this in Claude Code, pay attention to these practical details:

Project configuration. Add specific instructions to your CLAUDE.md file describing how your project handles this area. Include file paths, naming conventions, and any patterns that differ from common defaults. Claude Code reads CLAUDE.md at the start of every session and uses it to guide all operations.

Testing the setup. After configuration, verify everything works by running a simple test task. Ask Claude Code to perform a read-only operation first (like listing files or reading a config) before moving to write operations. This confirms that permissions, paths, and tools are all correctly configured.

Monitoring and iteration. Track your results over several sessions. If Claude Code consistently makes the same mistake, the fix is usually a more specific CLAUDE.md instruction. If it makes different mistakes each time, the issue is likely in the project setup or toolchain configuration.

Troubleshooting Checklist

When something does not work as expected, check these items in order:

  1. CLAUDE.md exists at the project root — run ls -la CLAUDE.md to verify
  2. Node.js version is 18+ — run node --version to check
  3. API key is set — run echo $ANTHROPIC_API_KEY | head -c 10 to verify (shows first 10 characters only)
  4. Disk space is available — run df -h . to check
  5. Network can reach the API — run curl -s -o /dev/null -w "%{http_code}" https://api.anthropic.com (should return 401 without auth, meaning the server is reachable)
  6. No conflicting processes — run ps aux | grep claude | grep -v grep to check for stale sessions