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claude-code - 💡(How to fix) Fix [BUG] Claude says MCP cannot be used in Claude Code on the Web [1 comments, 2 participants]

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anthropics/claude-code#54251•Fetched 2026-04-29 06:32:17
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riya-amemiyariya-amemiya
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Error Message

Error Messages/Logs

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Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

Whenever I launch the Web version of Claude Code and give it a task that requires MCP, Claude always tells me that it can only use GitHub.

What Should Happen?

MCP should be available on the Web version as well. I don't understand why it says it cannot be used.

Error Messages/Logs

Steps to Reproduce

  1. Ask Claude Code to "send a message on Slack."
  2. Claude will immediately respond with something like, "MCP is not available. Please configure it correctly! It's not my fault!" lol

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

No response

Claude Code Version

I don't know

Platform

Other

Operating System

Other

Terminal/Shell

Other

Additional Information

No response

extent analysis

TL;DR

The issue might be resolved by configuring MCP correctly for the Web version of Claude Code.

Guidance

  • Verify that MCP is properly configured for the Web version, as the error message suggests a configuration issue.
  • Check the documentation for Claude Code to see if there are specific instructions for setting up MCP on the Web version.
  • Try a different task that requires MCP to see if the issue is specific to the "send a message on Slack" task.
  • If possible, test the same task on a different platform or version to isolate the issue.

Notes

The issue lacks specific details about the configuration and version of Claude Code, which makes it difficult to provide a more precise solution.

Recommendation

Apply workaround: The user should try to configure MCP correctly for the Web version, as the error message suggests a configuration issue, and then test again to see if the problem is resolved.

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#dependency conflict#environment setup#docker error#permission error#memory optimization

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