GraphJin is a compiler and runtime that gives AI agents a governed graph-based way to work with databases, files, source code, workflows, and other systems through GraphQL and MCP. It is also used as a GraphQL-to-database service, API gateway, Go library, and real-time subscription server. The catalogue add-ons connect agents to GraphJin or support its agent workflow.
Borrowing it
Nothing to install: this file belongs to dosco/graphjin. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/dosco/graphjin/master/AGENTS.mdgit clone --depth 1 https://github.com/dosco/graphjinWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/instructions/dosco/graphjin/agents-md)<a href="https://agentmods.dev/instructions/dosco/graphjin/agents-md"><img src="https://agentmods.dev/badge/instructions/dosco/graphjin/agents-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/dosco/graphjin/agents-md"><img src="https://agentmods.dev/badge/instructions/dosco/graphjin/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.05837 | $0.05837 |
| Opus 5.5 | $0.02335 | $0.02335 |
| Sonnet 5.5 | $0.01167 | $0.01167 |
| Haiku 4.5 | $0.00584 | $0.00584 |
Grade A, and why
graphjin AGENTS.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 396 lines — stays where its author put it; the contents beside it link to each section on GitHub.
GraphJin Agent Guide
This document is a guide for AI agents working on the GraphJin codebase. It outlines the architectural patterns, coding conventions, and common tasks associated with maintaining and extending this library.
Architectural Overview
GraphJin is a compiler that turns GraphQL into database queries. For SQL databases, it generates SQL. For MongoDB, it generates a JSON DSL that is translated to aggregation pipelines. It is NOT a typical ORM or resolver-based GraphQL server.
- Core Philosophy: Push as much work as possible to the database.
- No Resolvers: Data fetching is done via a single generated SQL query. Do not add resolvers for database fields.
- Schema Driven: The database schema (
sdata) is the source of truth.
Directory Structure & Responsibilities
| Path | Component | Responsibility |
|---|---|---|
core/api.go |
Public API | The only entry point for users. Changes here are breaking. |
core/core.go |
Engine | Internal orchestration, initialization, and state management. |
core/internal/sdata |
Schema | Metadata about tables, columns, and relationships. Graph traversal logic. |
core/internal/qcode |
IR Compiler | Front-end compiler. Parses GraphQL -> QCode (Intermediate Representation). |
core/internal/psql |
SQL Compiler | Back-end compiler. QCode -> SQL. Handles dialect differences. |
core/internal/dialect |
Dialect Interface | Database-specific SQL generation methods. Each dialect implements this interface. |
core/internal/graph |
GraphQL Parser | Lexer and parser for GraphQL input. Builds AST. |
core/internal/jsn |
JSON Processing | High-performance JSON parsing and filtering utilities. |
serv/ |
HTTP Service | Standalone server with REST, GraphQL, and WebSocket APIs. |
auth/ |
Authentication | Auth providers: JWT, Auth0, Firebase, Rails session. |
cmd/ |
CLI Tool | Command-line interface for migrations, deployment, and management. |
conf/ |
Configuration | YAML-based config loading and validation. |
wasm/ |
WebAssembly | WASM build for NodeJS integration. |
mongodriver/ |
MongoDB Driver | Custom database/sql-compatible driver for MongoDB. Translates JSON DSL to aggregation pipelines. |
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2mo ago First seen · 396 lines · 5,837 tokens per session scan A ee1c41b86ca1
graphjin AGENTS.md is an instructions file published in the GitHub repository dosco/graphjin (3,234 stars, last pushed 5d ago), licensed Apache-2.0. It adds 5,837 tokens to every session, about $0.0233 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
graphjin AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| graphjin AGENTS.mddosco/graphjin | Instructions file | 3.2k | 5d ago | Apache-2.0 | A | 5,837 | Codex, OpenCode |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | today | MIT | A | 7,461 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 5,516 | GitHub Copilot |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | today | MIT | A | 4,680 | Codex, OpenCode |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |