MindsDB MySQL Server

MCP server for MindsDB that connects via MySQL protocol (port 47335), providing reliable tools for Claude Code and Desktop.

Why MySQL over SSE/HTTP?

• MySQL protocol is stable and well-tested
• No async event loop issues (the "this event loop is already running" errors)
• Better error messages and debugging
• Works reliably with knowledge base queries

Installation

cd mcp/mindsdb-mysql
npm install
npm run build

Configuration

Environment Variables

Variable	Default	Description
MINDSDB_HOST	127.0.0.1	MindsDB server host
MINDSDB_PORT	47335	MindsDB MySQL port
MINDSDB_USER	mindsdb	Username (use your MindsDB Cloud email for cloud instances)
MINDSDB_PASSWORD	(empty)	Password (required for MindsDB Cloud)

Claude Code (~/.claude.json)

{
  "mcpServers": {
    "mindsdb": {
      "type": "stdio",
      "command": "node",
      "args": [
        "/path/to/mindsdb-mysql/dist/index.js"
      ],
      "env": {
        "MINDSDB_HOST": "localhost",
        "MINDSDB_PORT": "47335",
        "MINDSDB_USER": "mindsdb",
        "MINDSDB_PASSWORD": ""
      }
    }
  }
}

For MindsDB Cloud, use your email as MINDSDB_USER and your password for MINDSDB_PASSWORD.

Claude Desktop (claude_desktop_config.json)

Same configuration, add to the mcpServers object.

Available Tools (11)

1. query - Execute SQL

Execute any MindsDB SQL query. Use this for custom queries not covered by other tools.

query(sql: string, database?: string): QueryResult

2. list_databases - List Data Sources

List all databases/data sources in MindsDB.

list_databases(): string[]

3. list_knowledge_bases - List KBs

List all knowledge bases in MindsDB.

list_knowledge_bases(): KnowledgeBase[]

4. describe - Describe Any Object

Describe a model, table, or knowledge base. Returns column information.

describe(name: string, database?: string): Description

5. search_kb - Search Knowledge Base

Search a knowledge base using hybrid semantic + keyword search.

search_kb(
  kb_name: string,
  question: string,
  limit?: number,         // default: 10
  alpha?: number,         // default: 0.5 (0=keyword, 1=semantic)
  min_relevance?: number, // default: 0
  metadata_filter?: Record<string, string>
): SearchResult[]

6. insert_kb - Insert Data into Knowledge Base

Insert data into a knowledge base from a source query.

insert_kb(
  kb_name: string,
  source_query: string,   // e.g., "SELECT id, content FROM mydb.docs"
  batch_size?: number,    // default: 1000
  threads?: number,       // default: 1
  skip_existing?: boolean // default: false
): { rows_inserted: number }

7. create_kb - Create Knowledge Base

Create a new knowledge base with embedding model configuration.

create_kb(
  name: string,
  embedding_model: {
    provider: string,     // openai, azure, google, ollama
    model_name: string,
    api_key?: string
  },
  content_columns: string[],
  metadata_columns?: string[],
  id_column?: string,
  reranking_model?: {...},
  storage?: string        // default: chromadb
): { kb_name: string }

8. list_jobs - List Scheduled Jobs

List all scheduled jobs in MindsDB.

list_jobs(): Job[]

9. create_job - Schedule Recurring Query

Create a scheduled job to run a query at regular intervals.

create_job(
  name: string,
  query: string,          // SQL to execute
  every: string,          // e.g., "1 hour", "1 day"
  start?: string,         // ISO datetime
  end?: string            // ISO datetime
): { job_name: string }

10. list_tables - List Tables

List all tables in a specific database.

list_tables(database: string): string[]

11. connect_database - Connect External Data Source

Connect an external database as a data source in MindsDB.

connect_database(
  name: string,
  engine: string,         // postgres, mysql, mongodb, etc.
  parameters: {
    host: string,
    port: number,
    database: string,
    user: string,
    password: string
  }
): { database_name: string }

Testing

With MCP Inspector

npx @modelcontextprotocol/inspector node dist/index.js

Or with a remote MindsDB instance:

MINDSDB_HOST=your-mindsdb-host MINDSDB_PORT=47335 \
  npx @modelcontextprotocol/inspector node dist/index.js

Manual verification

After configuring Claude Code, restart and verify:

# In Claude Code, these tools should be available:
mcp__mindsdb__list_databases
mcp__mindsdb__list_knowledge_bases
mcp__mindsdb__search_kb
mcp__mindsdb__query
# ... etc.

MindsDB SQL Reference

Knowledge Base Query

-- Semantic search
SELECT * FROM my_kb WHERE content = 'search phrase' LIMIT 10;

-- With relevance filter
SELECT * FROM my_kb WHERE content = 'query' AND relevance >= 0.5;

-- Hybrid search (keyword + semantic)
SELECT * FROM my_kb WHERE content = 'query' AND hybrid_search_alpha = 0.8;

-- Metadata filter
SELECT * FROM my_kb WHERE content = 'query' AND metadata_column = 'value';

Output Columns

• chunk_id: <id>:<chunk_number>of<total>:<start_char>to<end_char>
• chunk_content: The text content
• relevance: 0-1 score (higher = better match)
• distance: Vector distance (lower = closer)