GitHub Actions Claude engine failure: ENAMETOOLONG in MCP config file path across multiple workflows

What this error means

Error: Invalid MCP configuration: ENAMETOOLONG: name too long, open is a GitHub Actions failure pattern reported for developers trying to fix github actions workflow failures where claude engine terminates with enametoolong error when reading mcp configuration. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

At least 5 different GitHub Actions workflows failed with the same error on 2026-05-14: ‘Error: Invalid MCP configuration: ENAMETOOLONG: name too long, open’. The Claude engine in GitHub Actions workspace automation terminates unexpectedly when parsing MCP config files with excessively long paths.

Common causes

• Multiple GitHub Actions workflows fail simultaneously with the same ENAMETOOLONG error when the Claude engine tries to read MCP config. This cascading failure blocks entire CI/CD pipelines.
• At least 5 different GitHub Actions workflows failed with the same error on 2026-05-14: ‘Error: Invalid MCP configuration: ENAMETOOLONG: name too long, open’. The Claude engine in GitHub Actions workspace automation terminates unexpectedly when parsing MCP config files with excessively long paths.

Quick fixes

1. Confirm the exact error signature matches Error: Invalid MCP configuration: ENAMETOOLONG: name too long, open.
2. Check the GitHub Actions account, local tool state, and provider configuration involved in the failing workflow.
3. Compare the failing environment with a known working setup, then change one configuration value at a time.

Platform/tool-specific checks

• Verify the command, editor, extension, or API client that produced the error.
• Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
• Avoid deleting credentials, local model data, or project settings until the failing scope is clear.

Step-by-step troubleshooting

1. Capture the exact error message and the command, editor action, or request that triggered it.
2. Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
3. Review the source evidence below and compare it with your environment.
4. Apply one change at a time and rerun the smallest failing action.
5. Keep the working fix documented for the team or deployment environment.

How to prevent it

• Keep provider/tool configuration documented.
• Record non-secret diagnostics such as tool version, provider name, model name, and command path.
• Add a lightweight check before CI or production workflows depend on the tool.

Sources checked

• https://github.com/github/gh-aw/issues/32111
• https://github.com/github/gh-aw/issues/32110
• https://github.com/github/gh-aw/issues/32109
• https://github.com/github/gh-aw/issues/32106
• https://github.com/github/gh-aw/issues/32105

Evidence note: At least 5 different GitHub Actions workflows failed with the same error on 2026-05-14: ‘Error: Invalid MCP configuration: ENAMETOOLONG: name too long, open’. The Claude engine in GitHub Actions workspace automation terminates unexpectedly when parsing MCP config files with excessively long paths.

Related errors

• GitHub Actions Claude engine crash
• MCP config validation failed
• GitHub Actions ENAMETOOLONG workspace

FAQ

What should I check first?

Start with the exact Error: Invalid MCP configuration: ENAMETOOLONG: name too long, open text and the smallest action that reproduces it.

Can I ignore this error?

No. Treat it as a failed GitHub Actions workflow until the root cause is understood.

Is this guaranteed to have one fix?

No. The imported evidence supports the troubleshooting path above, but tool behavior can vary by account, plan, version, provider, and local configuration.

How do I know the fix worked?

Rerun the same command, editor action, or request. The fix is working when that action completes without Error: Invalid MCP configuration: ENAMETOOLONG: name too long, open.