Claude Code / AI Coding Tools

Filesystem MCP writes hang intermittently for 4 minutes then time out with unresponsive when launched via npx -y

Fix intermittent MCP write hangs that block Claude Code Desktop editing operations; reads work fine but writes fail. Hypothesis: npx re-resolving package each stdio handshake causes race condition with Claude Desktop startup window. Includes evidence for Claude Code troubleshooting demand.

Source-backed Last updated May 21, 2026 1 source Needs local verification

Category: AI Coding Tools
Error signature: edit_file hangs for 4 minutes, then times out with 'unresponsive' — only when Filesystem MCP configured via command: npx args: [-y, @modelcontextprotocol/server-filesystem]
Quick fix: Compare the failing environment with a known working setup, then change one configuration value at a time.
Updated: May 21, 2026
Verification status: Source-backed
Evidence: 1 public source URL

Before you change production

This page includes public source URLs in the imported troubleshooting record. Compare those references with your version and environment before applying changes.

Reproduce the smallest failing action and save non-secret logs before changing configuration.
Check versions for Claude Code, related SDKs, package managers, CI runners, and hosting providers.
Change one setting or dependency at a time, then rerun the same failing command or request.
Avoid destructive commands, credential rotation, billing changes, or security relaxations without a rollback plan.

What this error means

edit_file hangs for 4 minutes, then times out with 'unresponsive' — only when Filesystem MCP configured via command: npx args: [-y, @modelcontextprotocol/server-filesystem] is a Claude Code failure pattern reported for developers trying to fix intermittent mcp write hangs that block claude code desktop editing operations; reads work fine but writes fail. hypothesis: npx re-resolving package each stdio handshake causes race condition with claude desktop startup window.. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

GitHub Issue #4026 on modelcontextprotocol/servers (opened Apr 23, 2026). macOS-specific with Node.js v22. Works reliably after switching to npm install -g + direct binary path. Labeled as bug. Affected users following official docs get broken experience. High commercial value for Claude Code/Claude Desktop subscribers.

Common causes

GitHub Issue #4026 on modelcontextprotocol/servers (opened Apr 23, 2026). macOS-specific with Node.js v22. Works reliably after switching to npm install -g + direct binary path. Labeled as bug. Affected users following official docs get broken experience. High commercial value for Claude Code/Claude Desktop subscribers.

Quick fixes

Confirm the exact error signature matches edit_file hangs for 4 minutes, then times out with 'unresponsive' — only when Filesystem MCP configured via command: npx args: [-y, @modelcontextprotocol/server-filesystem].
Check the Claude Code account, local tool state, and provider configuration involved in the failing workflow.
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

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

Diagnostic flow for this page

Match edit_file hangs for 4 minutes, then times out with 'unresponsive' — only when Filesystem MCP configured via command: npx args: [-y, @modelcontextprotocol/server-filesystem] exactly before applying the quick fix.
Compare the failing environment with Claude Code versions, account scope, provider settings, and deployment context.
Check the listed common causes in order, starting with the cause that best matches your logs.
Use the evidence status below to decide whether to confirm against public sources or official documentation.
Apply one reversible change, rerun the smallest failing action, and keep rollback notes.

FAQ

What does edit_file hangs for 4 minutes, then times out with 'unresponsive' — only when Filesystem MCP configured via command: npx args: [-y, @modelcontextprotocol/server-filesystem] mean in Claude Code?

edit_file hangs for 4 minutes, then times out with 'unresponsive' — only when Filesystem MCP configured via command: npx args: [-y, @modelcontextprotocol/server-filesystem] indicates the workflow described by "Filesystem MCP writes hang intermittently for 4 minutes then time out with unresponsive when launched via npx -y" failed in a AI Coding Tools context. Start by confirming the exact signature and the component that emitted it.

What should I check first for edit_file hangs for 4 minutes, then times out with 'unresponsive' — only when Filesystem MCP configured via command: npx args: [-y, @modelcontextprotocol/server-filesystem]?

Check whether this cause matches your environment: GitHub Issue #4026 on modelcontextprotocol/servers (opened Apr 23, 2026). macOS-specific with Node.js v22. Works reliably after switching to npm install -g + direct binary path. Labeled as bug. Affected users following official docs get broken experience. High commercial value for Claude Code/Claude Desktop subscribers.

Is the edit_file hangs for 4 minutes, then times out with 'unresponsive' — only when Filesystem MCP configured via command: npx args: [-y, @modelcontextprotocol/server-filesystem] guidance source-backed?

The "Filesystem MCP writes hang intermittently for 4 minutes then time out with unresponsive when launched via npx -y" page is labeled source-backed. It has 1 public source URL from github.com, so use that evidence status when deciding how much additional verification you need.

When should I avoid the quick fix for edit_file hangs for 4 minutes, then times out with 'unresponsive' — only when Filesystem MCP configured via command: npx args: [-y, @modelcontextprotocol/server-filesystem]?

For "Filesystem MCP writes hang intermittently for 4 minutes then time out with unresponsive when launched via npx -y", avoid applying "Compare the failing environment with a known working setup, then change one configuration value at a time." when the error text differs, the affected version or provider is different, or the change would touch credentials, billing, DNS, production deploy settings, or irreversible data.

What should I collect before debugging edit_file hangs for 4 minutes, then times out with 'unresponsive' — only when Filesystem MCP configured via command: npx args: [-y, @modelcontextprotocol/server-filesystem]?

For "Filesystem MCP writes hang intermittently for 4 minutes then time out with unresponsive when launched via npx -y", collect the failing Claude Code command or request, non-secret configuration, versions, timestamps, request IDs when available, and the smallest reproduction that still triggers the signature.