🔐 Credential Manager MCP Server

A secure MCP server for managing API credentials locally. Read-only by default with simple JSON storage.

✨ Features

• 🔒 Secure by default - Read-only mode prevents accidental changes
• 📁 Simple storage - ~/.credential-manager-mcp/credentials.json
• 🔧 Easy setup - Interactive shell script
• 🔄 Multi-instance safe - Always reads fresh data from disk
• 🎯 Minimal exposure - Shows only essential data

🛠 Available Tools

Read-Only Mode (Default):

• list_credentials() - List credentials (id, app name only)
• get_credential_details(credential_id) - Get full details

Read-Write Mode:

• add_credential(app, base_url, access_token, [user_name], [expires])
• update_credential(credential_id, [fields...])
• delete_credential(credential_id)

🔒 Security

• Read-only by default
• Local storage only (~/.credential-manager-mcp/credentials.json)
• File locking for safe concurrent access
• Minimal data exposure in listings

🧪 Development

git clone https://github.com/mclamee/credential-manager-mcp.git
cd credential-manager-mcp
uv sync --dev
uv run pytest test/ -v

📄 License

MIT License - see LICENSE file for details.

🚀 Quick Start

1. Install & Configure

# Install from PyPI
uvx credential-manager-mcp

Common config (Claude Desktop):

{
  "mcpServers": {
    "credential-manager": {
      "command": "uvx",
      "args": ["credential-manager-mcp"],
      "env": {
        "CREDENTIAL_MANAGER_READ_ONLY": "false"
      }
    }
  }
}

Devlopment config (run from source):

{
  "mcpServers": {
    "credential-manager": {
      "command": "uv",
      "args": [
        "--directory", "/path/to/credential-manager-mcp",
        "run", "credential-manager-mcp"
      ],
      "env": {
        "CREDENTIAL_MANAGER_READ_ONLY": "false"
      }
    }
  }
}

2. Add Credentials

# Interactive mode
./add-credential.sh

# Command line
./add-credential.sh "GitHub" "https://api.github.com" "ghp_token" "username" "2024-12-31T23:59:59"

📋 Usage Examples

# List all credentials
list_credentials()
# {"credentials": [{"id": "abc...", "app": "GitHub"}], "count": 1}

# Get credential details
get_credential_details("credential-id")

# Add new credential (write mode only)
add_credential("GitHub", "https://api.github.com", "ghp_token", "user", "2024-12-31T23:59:59")

⚙️ Configuration

Environment Variables:

• CREDENTIAL_MANAGER_READ_ONLY - Set to "false" for write operations (default: "true")

Expiration Format:

• "2024-12-31T23:59:59" - ISO datetime
• "never" - No expiration