## Description Running `/mcp` (with no arguments) resets the entire `.claude.json` configuration file to a minimal initial state, **wiping out all `mcpServers` configurations** and other user settings. ## Steps to Reproduce 1. Have multiple MCP servers configured in `mcpServers` section of `~/.claude.json` 2. In Claude Code, type `/mcp` and press Enter (no arguments) 3. Observe `.claude.json` is replaced with a minimal config ## Expected Behavior `/mcp` with no arguments should **display**

[Bug] /mcp command with no args resets .claude.json to minimal state, wiping all MCP server configs

Status Open

Reported on v2.1.222

Maintainer reply None cached

Activity 0 comments · opened Aug 5, 2026

Description

Running /mcp (with no arguments) resets the entire .claude.json configuration file to a minimal initial state, wiping out all mcpServers configurations and other user settings.

Steps to Reproduce

Have multiple MCP servers configured in mcpServers section of ~/.claude.json
In Claude Code, type /mcp and press Enter (no arguments)
Observe .claude.json is replaced with a minimal config

Expected Behavior

/mcp with no arguments should display the current MCP server status. It should never modify the config file.

Actual Behavior

The entire .claude.json is overwritten — all mcpServers, projects, customApiKeyResponses, env settings, editorMode, etc. are lost.

Environment

Platform: macOS (darwin)
Claude Code version: 2.1.222
VSCode extension

Impact

This is data loss — user configuration is silently destroyed. Recovery is only possible if the user has manually created a backup.

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