MCP Uninstall

MCP Server Uninstall

This skill helps users remove Magnet MCP server configurations (magnet-local and/or magnet-canary) from their system.

When to Use This Skill

Use this skill when the user requests:

• Removing MCP server configurations
• Cleaning up old MCP settings
• Uninstalling the local or canary MCP server
• Resetting their MCP configuration

Instructions

Step 1: Ask What to Uninstall

Use AskUserQuestion to determine which configuration(s) to remove:

Question: "Which MCP server configuration do you want to remove?" Options:

• "magnet-local" - Remove the local development server configuration
• "magnet-canary" - Remove the canary environment server configuration
• "Both" - Remove both local and canary configurations

Step 2: Scan for Configurations

Check for MCP configurations in project and client-specific locations:

Project location (magnet-app):

# Find magnet-app directory
MAGNET_APP_DIR=$(ls -d ~/magnet-app 2>/dev/null || ls -d ~/Projects/magnet-app 2>/dev/null || ls -d ~/Code/magnet-app 2>/dev/null)

# Check for .mcp.json
if [ -n "$MAGNET_APP_DIR" ] && [ -f "$MAGNET_APP_DIR/.mcp.json" ]; then
  echo "Found project config: $MAGNET_APP_DIR/.mcp.json"
  cat "$MAGNET_APP_DIR/.mcp.json"
fi

Cursor:

if [ -f ~/.cursor/mcp.json ]; then
  echo "Found Cursor config: ~/.cursor/mcp.json"
  cat ~/.cursor/mcp.json
fi

Claude Desktop (macOS):

if [ -f ~/Library/Application\ Support/Claude/claude_desktop_config.json ]; then
  echo "Found Claude Desktop config"
  cat ~/Library/Application\ Support/Claude/claude_desktop_config.json
fi

Global Claude Code locations (~/.claude/):

# Check for global MCP configs
if [ -f ~/.claude/settings.json ]; then
  echo "Found ~/.claude/settings.json"
  grep -l "mcpServers" ~/.claude/settings.json 2>/dev/null && cat ~/.claude/settings.json
fi

if [ -f ~/.claude/settings.local.json ]; then
  echo "Found ~/.claude/settings.local.json"
  cat ~/.claude/settings.local.json
fi

Step 3: Display Findings

Report what was found to the user:

• List each location where the target configuration(s) exist
• Show the current configuration content
• If configuration not found, report "Configuration not found in [location]"

Step 4: Confirm Removal

Use AskUserQuestion to confirm before making changes:

Question: "Found [config-name] in [locations]. Do you want to remove it?" Options:

• "Yes, remove it" - Proceed with removal
• "No, cancel" - Abort the operation

Step 5: Remove Configuration Entries

For each location where the configuration exists:

Removing from .mcp.json:

# Use jq to remove specific server entry (if jq is available)
# Otherwise, use node/JavaScript to parse and modify JSON

# Example with node:
node -e "
const fs = require('fs');
const path = '$MAGNET_APP_DIR/.mcp.json';
const config = JSON.parse(fs.readFileSync(path, 'utf8'));
delete config.mcpServers['magnet-local'];  // or 'magnet-canary'
fs.writeFileSync(path, JSON.stringify(config, null, 2));
console.log('Removed magnet-local from', path);
"

Important behaviors:

• Only remove the specific server entry, not the entire file
• If mcpServers becomes empty after removal, remove the mcpServers key
• If the file becomes just {}, optionally inform user they can delete the file
• Preserve other configurations in the same file

Step 6: Report Results

After removal, report:

• Which configurations were removed
• From which locations
• Any configurations that were not found
• Remind user to restart Claude Code to apply changes

Example output:

Removed configurations:
- magnet-local from ~/magnet-app/.mcp.json
- magnet-canary from ~/magnet-app/.mcp.json

Not found:
- No global configurations in ~/.claude/

Please restart Claude Code to apply the changes.

Edge Cases

Configuration Not Found

If the requested configuration doesn't exist:

The magnet-local configuration was not found in any of the checked locations:
- ~/magnet-app/.mcp.json (file exists but doesn't contain magnet-local)
- ~/.claude/settings.json (no mcpServers section)

No changes were made.

Last Server in File

If removing the last server entry:

// After removal, check if mcpServers is empty
if (Object.keys(config.mcpServers).length === 0) {
  delete config.mcpServers;
  // Inform user: "The mcpServers section is now empty"
}

File Permissions

If unable to modify the file:

Error: Unable to modify ~/magnet-app/.mcp.json
Please check file permissions or remove the configuration manually.

Examples

Example 1: Remove Local Configuration

User: "Remove the local MCP server"

Actions:

1. Confirm they want to remove magnet-local
2. Check ~/magnet-app/.mcp.json - found magnet-local
3. Check ~/.claude/ - no global config
4. Ask for confirmation
5. Remove magnet-local entry from .mcp.json
6. Report success and remind to restart Claude Code

Example 2: Remove Both Configurations

User: "Clean up all Magnet MCP configurations"

Actions:

1. Ask which to remove → user selects "Both"
2. Scan all locations
3. Find magnet-local and magnet-canary in ~/magnet-app/.mcp.json
4. Confirm removal of both
5. Remove both entries
6. Report what was removed

Example 3: Configuration Not Found

User: "Remove the canary server"

Actions:

1. Confirm they want to remove magnet-canary
2. Scan locations - magnet-canary not found anywhere
3. Report "Configuration not found, no changes made"

Notes

• This skill removes configuration entries, not the actual MCP server code
• Always confirm before removing configurations
• Check both project-specific and global locations
• Preserve other configurations in the same files
• Remind users to restart Claude Code after changes
• If jq is not available, use node for JSON manipulation