claude-code - 💡(How to fix) Fix [BUG] Missing Tools should be surfaced as a hard blocker [1 comments, 2 participants]

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anthropics/claude-code#46459Fetched 2026-04-11 06:19:44
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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?

Missing MCP tools should be surfaced as a hard blocker when a task explicitly depends on them, not discovered through failed fetches Credits spent on a session that couldn't fulfill the stated requirement due to environment misconfiguration

What Should Happen?

Action should stop when it realizes it doesn't have the tools and user gets reimbursed for the credits wasted if it continues with the action

Error Messages/Logs

Steps to Reproduce

Missing MCP tools should be surfaced as a hard blocker when a task explicitly depends on them, not discovered through failed fetches Credits spent on a session that couldn't fulfill the stated requirement due to environment misconfiguration

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

4.6

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Windows Terminal

Additional Information

No response

extent analysis

TL;DR

The issue can be addressed by modifying the task dependency check to surface missing MCP tools as a hard blocker before attempting to fetch them, and implementing a reimbursement mechanism for credits spent on sessions that cannot fulfill their stated requirements.

Guidance

  • Review the task dependency check logic to ensure it properly identifies and handles missing MCP tools as a hard blocker, preventing unnecessary fetch attempts and credit expenditure.
  • Implement a check for environment misconfiguration before starting a session, and stop the action if the requirements cannot be met, to prevent wasting credits.
  • Consider adding a reimbursement mechanism for credits spent on sessions that are terminated due to missing dependencies or environment misconfiguration.
  • Investigate the regression by comparing the current version (4.6) with the previous working version to identify the introduced change causing the issue.

Example

No specific code example can be provided without more details on the implementation, but the task dependency check logic might involve a conditional statement to verify the presence of required MCP tools before proceeding.

Notes

The solution may require modifications to the Anthropic API or the Claude Code implementation, and the exact changes will depend on the specific requirements and constraints of the system. The reimbursement mechanism for credits spent on failed sessions will need to be designed and implemented carefully to ensure fairness and prevent abuse.

Recommendation

Apply a workaround by modifying the task dependency check logic and implementing a reimbursement mechanism, as the root cause of the regression is not immediately clear and may require further investigation to identify and fix.

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