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This guide covers common errors when using Claude Code CLI through Unbound. For initial setup, see the Claude Code Integration guide.

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”No api_key found in callback. Exiting.”

The authentication flow didn’t complete properly. How to fix:
1

Run the setup command again

Re-run the Unbound CLI setup for Claude Code.
2

Complete the browser step fully

Don’t close the browser tab early. Wait for the success page.
3

Check pop-up blockers

Ensure pop-ups are not blocked in your browser.
4

Try a different browser

Some SSO providers have issues with specific browsers.
5

Use manual setup as fallback

If the issue persists, set environment variables manually:
export ANTHROPIC_API_KEY="your-unbound-api-key"
export ANTHROPIC_BASE_URL="https://api.getunbound.ai"

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“API Key Verification Failed” / “Fetch Failed”

This usually indicates a network or configuration issue. Common causes and fixes:
  • Check your network connection — ensure you can reach api.getunbound.ai
  • Corporate proxy — if behind a corporate proxy, configure proxy settings in your terminal
  • Verify environment variables are set correctly: 
    echo $ANTHROPIC_API_KEY
echo $ANTHROPIC_BASE_URL
    Both should return values. If empty, your shell profile didn’t load them — re-add them and run source ~/.zshrc.

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”Self-Signed Certificate Detected”

This occurs when your corporate network uses SSL inspection or interception. Fix: Add your corporate CA certificate to Node.js: 
export NODE_EXTRA_CA_CERTS="/path/to/your/corporate-ca.pem"
Add this to your shell profile (~/.bashrc, ~/.zshrc, or PowerShell profile). Contact your IT team for the correct certificate file path.

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”Claude Code Not Found” After Installation

1

Check your PATH

Verify npm global bin is in your PATH:
npm config get prefix
2

Add to PATH if missing

Add the npm global bin directory to your PATH in your shell profile.
3

Avoid sudo with npm

If you installed with sudo, uninstall and reinstall using:
npm config set prefix ~/.npm-global
4

Restart your terminal

After updating your PATH, restart your terminal completely.

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Node.js/npm Version Issues

If you updated Node.js or npm and Claude Code stopped working:
  1. Reinstall Claude Code: 
    npm install -g @anthropic-ai/claude-code
  2. Verify the installation: 
    which claude
  3. If using nvm, make sure the correct Node.js version is active

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Token Limit Exceeded Errors

If you see “Claude’s response exceeded the output token maximum”, set the environment variable to increase the limit: 
export CLAUDE_CODE_MAX_OUTPUT_TOKENS=64000
Add to your shell profile and restart your terminal. See Model & Token Errors for more details.

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Still Having Issues?

See API Key Troubleshooting for invalid key and authentication errors.