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Datomic MCP Server

@theronic

Repository

Basic information

Category

Other

Transports

stdio

Author

theronic

About Datomic MCP Server

Datomic MCP Server so your AI model can query your database (uses Modex MCP library)

Datomic MCP Server config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "modex-datomic-mcp": {
      "command": "java",
      "args": [
        "-jar",
        "/Users/petrus/code/datomic-mcp/target/theronic-datomic-mcp-0.3.0.jar"
      ],
      "env": {
        "DATOMIC_URI": "<your datomic URI here>"
      }
    }
  }
}

Datomic MCP Server tools

Tool list not available yet

This listing does not currently have a tool list to display. This does not mean the server has no tools; check its documentation for supported capabilities.

We auto-extract tools from the README. The maintainer can list them under a ## Tools heading to populate this section.

Overview

What is Datomic MCP Server?

It is an MCP server that integrates Datomic databases with the Model Context Protocol, enabling LLM-powered applications to execute Datomic queries and operations. Built with Modex, it supports concurrent queries and exposes core Datomic API functions as MCP tools. It is designed for developers building AI assistants that need to interact with Datomic data.

How to use Datomic MCP Server?

Run the provided Java uberjar and configure the DATOMIC_URI environment variable in your MCP client settings (e.g., Claude Desktop). The server currently supports query, datoms, with, pull, pull-many, entity, touch, and entid operations through MCP tools.

Key features of Datomic MCP Server

  • Supports concurrent queries with async message handling
  • Exposes datomic.api/q as an MCP tool
  • Exposes datomic.api/datoms as an MCP tool
  • Provides datomic.api/with via the q-with tool
  • Exposes datomic.api/pull and pull-many tools
  • Supports entity, touch, and entid operations

Use cases of Datomic MCP Server

  • Query Datomic databases from LLM-based chat interfaces
  • Enable AI coding assistants to inspect Datomic schema and data
  • Build agentic workflows that read and write Datomic data
  • Integrate Datomic with MCP-compatible development environments

Frequently asked questions

1

Does Datomic MCP Server support transact operations?

No, transact support is not implemented as the author is unsure it is a good idea.

2

How does the server handle database basis?

Each query currently runs `(d/db conn)` fresh, meaning a stable db basis is not yet implemented. As-of queries are planned but not supported.

3

What runtime does Datomic MCP Server require?

It requires Java to run the provided uberjar, and the `DATOMIC_URI` environment variable pointing to a valid Datomic database URI.

4

Is Datomic MCP Server free to use?

Yes, it is released under the MIT License and is free for commercial and non-commercial use.

5

What license does the underlying Modex framework use?

Datomic MCP Server is MIT-licensed, but Modex itself has a different license.

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