Datomic MCP Server
@theronic
About Datomic MCP Server
Datomic MCP Server so your AI model can query your database (uses Modex MCP library)
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>"
}
}
}
}Tools
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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/qas an MCP tool - Exposes
datomic.api/datomsas an MCP tool - Provides
datomic.api/withvia theq-withtool - Exposes
datomic.api/pullandpull-manytools - Supports
entity,touch, andentidoperations
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
FAQ from Datomic MCP Server
Does Datomic MCP Server support transact operations?
No, transact support is not implemented as the author is unsure it is a good idea.
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.
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.
Is Datomic MCP Server free to use?
Yes, it is released under the MIT License and is free for commercial and non-commercial use.
What license does the underlying Modex framework use?
Datomic MCP Server is MIT-licensed, but Modex itself has a different license.
Frequently asked questions
Does Datomic MCP Server support transact operations?
No, transact support is not implemented as the author is unsure it is a good idea.
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.
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.
Is Datomic MCP Server free to use?
Yes, it is released under the MIT License and is free for commercial and non-commercial use.
What license does the underlying Modex framework use?
Datomic MCP Server is MIT-licensed, but Modex itself has a different license.
Basic information
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