Status: Works great and is in daily use without any known bugs.
Status2: I just added the package to PyPI and updated the usage instructions. Please report any issues :)
Let Claude be your database expert! MCP Alchemy connects Claude Desktop directly to your databases, allowing it to:
- Help you explore and understand your database structure
- Assist in writing and validating SQL queries
- Displays relationships between tables
- Analyze large datasets and create reports
- Claude Desktop Can analyse and create artifacts for very large datasets using claude-local-files.
Works with PostgreSQL, MySQL, MariaDB, SQLite, Oracle, MS SQL Server, CrateDB,
and a host of other SQLAlchemy-compatible databases.
Installation
Ensure you have uv installed:
# Install uv if you haven't already
curl -LsSf https://astral.sh/uv/install.sh | sh
Usage with Claude Desktop
Add to your claude_desktop_config.json. You need to add the appropriate database driver in the --with parameter.
SQLite (built into Python)
{
"mcpServers": {
"my_sqlite_db": {
"command": "uvx",
"args": ["--from", "mcp-alchemy==2025.04.09.091234", "mcp-alchemy"],
"env": {
"DB_URL": "sqlite:///path/to/database.db"
}
}
}
}
PostgreSQL
{
"mcpServers": {
"my_postgres_db": {
"command": "uvx",
"args": ["--from", "mcp-alchemy==2025.04.09.091234", "--with", "psycopg2-binary", "mcp-alchemy"],
"env": {
"DB_URL": "postgresql://user:password@localhost/dbname"
}
}
}
}
MySQL/MariaDB
{
"mcpServers": {
"my_mysql_db": {
"command": "uvx",
"args": ["--from", "mcp-alchemy==2025.04.09.091234", "--with", "pymysql", "mcp-alchemy"],
"env": {
"DB_URL": "mysql+pymysql://user:password@localhost/dbname"
}
}
}
}
Microsoft SQL Server
{
"mcpServers": {
"my_mssql_db": {
"command": "uvx",
"args": ["--from", "mcp-alchemy==2025.04.09.091234", "--with", "pymssql", "mcp-alchemy"],
"env": {
"DB_URL": "mssql+pymssql://user:password@localhost/dbname"
}
}
}
}
Oracle
{
"mcpServers": {
"my_oracle_db": {
"command": "uvx",
"args": ["--from", "mcp-alchemy==2025.04.09.091234", "--with", "cx_oracle", "mcp-alchemy"],
"env": {
"DB_URL": "oracle+cx_oracle://user:password@localhost/dbname"
}
}
}
}
CrateDB
{
"mcpServers": {
"my_cratedb": {
"command": "uvx",
"args": ["--from", "mcp-alchemy==2025.04.09.091234", "--with", "sqlalchemy-cratedb>=0.42.0.dev1", "mcp-alchemy"],
"env": {
"DB_URL": "crate://user:password@localhost:4200/?schema=testdrive"
}
}
}
}
For connecting to CrateDB Cloud, use a URL like
crate://user:[email protected]:4200?ssl=true.
Environment Variables
DB_URL: SQLAlchemy database URL (required)CLAUDE_LOCAL_FILES_PATH: Directory for full result sets (optional)EXECUTE_QUERY_MAX_CHARS: Maximum output length (optional, default 4000)
API
- all_table_names
- Return all table names in the database
- No input required
-
Returns comma-separated list of tables
users, orders, products, categories
-
filter_table_names
- Find tables matching a substring
- Input:
q (string)
-
Returns matching table names
Input: "user"
Returns: "users, user_roles, user_permissions"
-
schema_definitions
- Get detailed schema for specified tables
- Input:
table_names (string[])
-
Returns table definitions including:
- Column names and types
- Primary keys
- Foreign key relationships
- Nullable flags
users:
id: INTEGER, primary key, autoincrement
email: VARCHAR(255), nullable
created_at: DATETIME
Relationships:
id -> orders.user_id
-
execute_query
- Execute SQL query with vertical output format
- Inputs:
query (string): SQL queryparams (object, optional): Query parameters
- Returns results in clean vertical format:
1. row
id: 123
name: John Doe
created_at: 2024-03-15T14:30:00
email: NULL
Result: 1 rows
- Features:
- Smart truncation of large results
- Full result set access via claude-local-files integration
- Clean NULL value display
- ISO formatted dates
- Clear row separation
Claude Local Files
When claude-local-files is configured:
- Access complete result sets beyond Claude's context window
- Generate detailed reports and visualizations
- Perform deep analysis on large datasets
- Export results for further processing
The integration automatically activates when CLAUDE_LOCAL_FILES_PATH is set.
Contributing
Contributions are warmly welcomed! Whether it's bug reports, feature requests, documentation improvements, or code contributions - all input is valuable. Feel free to:
- Open an issue to report bugs or suggest features
- Submit pull requests with improvements
- Enhance documentation or share your usage examples
- Ask questions and share your experiences
The goal is to make database interaction with Claude even better, and your insights and contributions help achieve that.
License
Mozilla Public License Version 2.0
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