[BUG] Claude Code CLI Isn't Detecting Project Scoped MCP Server

Status Fixed / completed

Maintainer reply None cached

Activity 9 comments · opened Jun 16, 2025 · closed Aug 6, 2025

Environment

Platform (select one):
[x] Anthropic API

Claude CLI version: 1.0.24 (Claude Code)
Operating System: Ubuntu 22.04 (WSL)
Terminal: Windows Terminal App (WSL)

Bug Description

Project scoped MCPs are no longer being detected when starting Claude in my project folder. I have had this working previously in other projects. I have tried creating the .mcp.json file myself in the project's root folder and I've also used the 'claude mcp add -s project -- xxx' command which successfully creates the .mcp.json file and returns a success message. When starting Claude, it does not show any MCP servers when using /mcp.

Steps to Reproduce

Created .mcp.json and used:

{
  "mcpServers": {
    "supabase": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@supabase/mcp-server-supabase@latest",
        "--access-token=xxx"
      ],
      "env": {}
    }
  }
}

Started Claude and checked /mcp. No servers detected.
Deleted .mcp.json
Used command claude mcp add supabase -s project -- npx -y @supabase/mcp-server-supabase@latest --access-token=xxx
Started Claude, used /mcp. No mcp servers detected.
'Claude mcp list' also shows no mcp servers.

Actual Behavior

No MCP servers detected in Claude Code despite .mcp.json file being correctly created by command in step 5 above.

Additional Context

View original on GitHub ↗

9 Comments

jcavalieri · 1 year ago

This is also a bug on macOS 15.5.

dargue3 · 1 year ago

I had this issue but I just realized that in my project's .claude/settings.local.json I had my mcp server listed under disabledMcpjsonServers. Delete it out of there, relaunch claude, and you'll get another opportunity to okay it. Once I did that it was working

paulozoom · 1 year ago

I had the same issue and @dargue3’s note fixed it for me. I don’t quite know how my server had found itself to disabledMcpjsonServers. Perhaps claude mcp list should report which servers are explicitly disabled by the user.

based64-eth · 1 year ago

~no fix for this still?~

Quick fix: add .mcp.json to .gitignore.

timjrobinson · 1 year ago

I thought I was experiencing this until I realized it was just a syntax error in my JSON (missing comma). Claude doesn't complain about JSON errors in .mcp.json files like it does with the global ~/.claude.json file so do check for that.

ceponatia · 1 year ago

I thought I was experiencing this until I realized it was just a syntax error in my JSON (missing comma). Claude doesn't complain about JSON errors in .mcp.json files like it does with the global ~/.claude.json file so do check for that.

I thought this was the case too but the issue persists if I create the .mcp.json myself or if I let Claude do it with -s project. I've since just started using local and user scopes until this is resolved.

tristanbob · 1 year ago

This happened to me also.
Supabase MCP was working great yesterday, but then it started showing 0 tools.
I had to restart Claude Code to get the 19 tools to show up.

MarkAngler · 1 year ago

still happening

github-actions[bot] · 1 year ago

This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.