GraphJin provides a Go-based compiler and runtime exposing GraphQL + MCP over multiple data sources for AI agents, with demos, MCP tooling, and CodeSQL indexing. It supports server, CLI, and demo modes and ships with multiple installation paths.
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What it is
GraphJin is a compiler and runtime that gives AI agents a single governed graph over databases, warehouses, files, source code, workflows, metadata, and security policy via GraphQL + MCP. It also functions as a high-performance GraphQL-to-database compiler, Go library, standalone API service, REST/OpenAPI gateway, and real-time subscription server. It supports PostgreSQL, MySQL, MongoDB, SQLite, Oracle, MSSQL, Snowflake, Redshift, BigQuery, Cassandra/Amazon Keyspaces, S3/GCS/local files, CodeSQL sources, and models from Claude, GPT-4 to local models.
How it works
- Connects to databases by reading schemas automatically.
- Discovers relationships via foreign keys.
- Exposes metadata through gj_* tables when feature capabilities are enabled.
- Indexes source code with CodeSQL into a managed SQLite database.
- Exposes MCP tools to teach LLMs the query syntax.
- Runs JS workflows to chain MCP tools.
- Compiles each request into a single optimized SQL query.
CodeSQL details: a managed source kind indexing files via tree-sitter, with a SQLite cache at config/codesql/. It watches for changes in development and disables watching in production. See examples for configuring sources and tables, and using gj_code and gj_catalog.
Getting started
Install options include:
- npm: "npm install -g graphjin"
- macOS: "brew install dosco/graphjin/graphjin"
- Windows: commands under Scoop as shown, including adding the graphjin bucket and installing graphjin
- Docker: "docker pull dosco/graphjin"
Run the built-in demo with:
graphjin serve --demo
The demo state is under ./graphjin-demo. Use the MCP and agent endpoints as indicated in output.
To add GraphJin to an AI client locally:
graphjin mcp add claude
graphjin mcp add codex
Defaults are client=codex, server=http://localhost:8080, and project scope. The server/mcp endpoint is at /api/v1/mcp.
Recent releases
Latest releases show version updates and changelog entries, e.g., v3.19.1 (2026-07-20) and v3.19.0 (2026-07-20), with notes like version bumps and internal refactors.
Traction
Stars: 3121; Forks: 186; Open issues: 22.
Behind the repo
The project is named GraphJin, with the repository under dosco/graphjin. It is licensed Apache-2.0 and created in 2019-03-24.
Caveats
License: Apache-2.0. Created: 2019-03-24. Last push: 2026-07-20. Open issues: 22.