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claude-code - 💡(How to fix) Fix [BUG] MCP Filesystem server crashes on connect since v1.3883.0 update (macOS, Cowork) [1 comments, 2 participants]

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anthropics/claude-code#52028•Fetched 2026-04-23 07:38:28
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Error Message

The built-in MCP Filesystem server crashes within 1-2 seconds of starting after the April 21 update. The error banner "MCP Filesystem: Server disconnected" appears on every session and cannot be resolved.

Error Messages/Logs

  1. Observe "MCP Filesystem: Server disconnected" error banner immediately on load Troubleshooting already attempted: cache cleared, app reinstalled, Full Disk Access granted in macOS Privacy & Security, all trusted folder paths verified to exist, trusted folders list cleared entirely. Error persists across all attempts.

Code Example

Server started and connected successfully
Server transport closed unexpectedly, this is likely due to the process exiting early
Server disconnected.
RAW_BUFFERClick to expand / collapse

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?

The built-in MCP Filesystem server crashes within 1-2 seconds of starting after the April 21 update. The error banner "MCP Filesystem: Server disconnected" appears on every session and cannot be resolved.

What Should Happen?

Filesystem server connects and stays connected as it did prior to v1.3883.0.

Error Messages/Logs

Server started and connected successfully
Server transport closed unexpectedly, this is likely due to the process exiting early
Server disconnected.

Steps to Reproduce

  1. Open Claude desktop app (Cowork mode) on macOS
  2. Observe "MCP Filesystem: Server disconnected" error banner immediately on load
  3. Check ~/Library/Logs/Claude/mcp-server-filesystem.log — server starts then exits within 1-2 seconds

No user action required — crash occurs automatically on every session start.

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

Unknown — last confirmed working April 17, 2026 (prior to v1.3883.0)

Claude Code Version

Claude 1.3883.0 (93ff6c) 2026-04-21T17:24:01.000Z

Platform

Other

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

This is a Claude Desktop App (Cowork mode) bug, not a CLI issue.

Troubleshooting already attempted: cache cleared, app reinstalled, Full Disk Access granted in macOS Privacy & Security, all trusted folder paths verified to exist, trusted folders list cleared entirely. Error persists across all attempts.

extent analysis

TL;DR

The MCP Filesystem server crash is likely due to a regression introduced in version 1.3883.0, and a potential workaround could be to revert to a previous version or wait for a patch.

Guidance

  • The error message "Server transport closed unexpectedly, this is likely due to the process exiting early" suggests that the server is crashing due to an unexpected exit, which could be caused by a bug in the new version.
  • To verify the issue, check the ~/Library/Logs/Claude/mcp-server-filesystem.log file to see if the server starts and exits within 1-2 seconds.
  • Since the issue is a regression and the last working version is unknown, it may be helpful to try installing an older version of Claude Code to see if the issue persists.
  • The fact that the error occurs immediately on load and across all troubleshooting attempts suggests that the issue is likely related to the new version rather than a configuration or environment issue.

Notes

The exact cause of the issue is unclear, and without more information or logs, it's difficult to provide a more specific solution. However, given that the issue is a regression and the troubleshooting attempts have been thorough, it's likely that the issue is related to the new version.

Recommendation

Apply workaround: Revert to a previous version of Claude Code, if possible, until a patch is released to fix the regression. This is because the issue is a regression and the new version is causing the server to crash unexpectedly.

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