Managed MCP Server API

Tacnode provides managed MCP Server through https://mcp-server.tacnode.io/mcp, it provides read-only access to Tacnode databases, enables schema inspection and execute read-only queries. It uses JSON-RPC 2.0 as its wire format.

Prerequisites

The Data Cloud, Nodegroup and Database should be ready before access the MCP Server, refer to Managed MCP Server.
Token is required during the authentication. The token is generated from Nodegroup Overview->MCP Tokens.
Install Node.js and npm

Authentication

Replace YOUR_API_KEY with your actual key below.

Claude Desktop

Edit the configuration file at:

macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
Windows: %APPDATA%\Claude\claude_desktop_config.json

Add the below code:

{
  "mcpServers": {
    "tacnode": {
      "command": "npx",
      "args": [
        "mcp-remote",
        "https://mcp-server.tacnode.io/mcp",
        "--header",
        "Authorization: Bearer <YOUR_TOKEN>"
      ]
    },
  }
}

Rate Limits

60 requests per minute per API key.
Exceeding returns HTTP 429 Too Many Requests.
Use retry and exponential backoff to handle limits.

Resources API

Database Resources

Resource Name	URI Format	Description
schemas	`db://schemas`	Returns a list of all schemas in the database
tables_in_schema	`db://schemas/{schemaName}/tables`	Returns a list of all tables in the database or within a specific schema
table_structure_in_schema	`db://schemas/{schemaName}/tables/{tableName}`	Returns schema information for a specific table, optionally within a specific database schema
indexes_in_table	`db://schemas/{schemaName}/tables/{tableName}/indexes`	Returns information about indexes on a table
procedures_in_schema	`db://schemas/{schemaName}/procedures`	Returns a list of all stored procedures/functions in the database or within a specific schema

Resources Read

Example: get all tables in public schema.

Request Body:

{
  "method": "resources/read",
  "params": {
    "uri": "db://schemas/public/tables"
  }
}

Response Body:

{
  "contents": [
    {
      "uri": "db://schemas/public/tables",
      "mimeType": "application/json",
      "text": "{
            \"success\": true,
            \"data\": {
                \"tables\": [
                    \"bookings\",
                    \"calendar\",
                    \"hosts\",
                    \"listings\",
                    \"listings_embedding\",
                    \"reviews\",
                    \"users\"
                ],
                \"count\": 7,
                \"schema\": \"public\"
              }
            }"
    }
  ]
}

Example: get the table structure for table listings.

Request Body:

{
  "method": "resources/read",
  "params": {
    "uri": "db://schemas/public/tables/listings"
  }
}

Response Body:

{
  "contents": [
    {
      "uri": "db://schemas/public/tables/listings",
      "mimeType": "application/json",
      "text": "{
            \"success\": true,
            \"data\": {
                   \"table\": \"listings\",
                   \"schema\": \"public\",
                   \"columns\": [
                      {
                        \"name\": \"id\",
                        \"type\": \"bigint\",
                        \"nullable\": false,
                        \"default\": \"nextval('public.listings_id_seq'::regclass)\"
                      },
            ...}"
    }
  ]
}

Tools API

Database Tools

Tool	Command Name	Description
Execute SQL	`query`	Execute single or multiple SQL statements (separated by semicolons)

Tools Call

Example: execute the read-only query and get the results.

Request Body:

{
  "method": "tools/call",
  "params": {
    "name": "query",
    "arguments": {
      "sql": "SELECT id, name, review_scores_rating
              FROM listings
              WHERE neighbourhood = 'Hong Kong, Hong Kong Island, Hong Kong' ORDER BY review_scores_rating DESC
              LIMIT 5;"
    }
  }
}

Response Body:

{
  "content": [
    {
      "type": "text",
      "text": "[
          {
            \"id\": \"870078051526378382\",
            \"name\": \"Rental unit in Hong Kong\",
            \"review_scores_rating\": null
          },
          {
            \"id\": \"868559240183915405\",
            \"name\": \"Rental unit in Hong Kong\",
            \"review_scores_rating\": null
           }...]"
    }
  ],
  "isError": false
}

Managed MCP Server API

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