DBHub is a lightweight Model Context Protocol server that lets compatible AI clients connect to and explore PostgreSQL, MySQL, MariaDB, SQL Server, and SQLite databases through one interface. Developers and other users employ it for schema inspection, query validation, debugging, and controlled read-only database access; the catalogue entries provide agent skills, instructions, an MCP configuration, and a plugin.
Borrowing it
Nothing to install: this file belongs to bytebase/dbhub. 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/bytebase/dbhub/main/CLAUDE.mdgit clone --depth 1 https://github.com/bytebase/dbhubWrote 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/bytebase/dbhub/claude-md)<a href="https://agentmods.dev/instructions/bytebase/dbhub/claude-md"><img src="https://agentmods.dev/badge/instructions/bytebase/dbhub/claude-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/bytebase/dbhub/claude-md"><img src="https://agentmods.dev/badge/instructions/bytebase/dbhub/claude-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 | $0.03898 | $0.03898 |
| Opus 5.5 | $0.01559 | $0.01559 |
| Sonnet 5.5 | $0.00780 | $0.00780 |
| Haiku 4.5 | $0.00390 | $0.00390 |
Grade C, and why
dbhub CLAUDE.md scanned grade C with 1 finding 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 19d 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.
Reaches for credential fileshighPrivilege escalation
SSH keys, cloud credentials, git-credentials, .npmrc, /etc/shadow: reading these is how a config file becomes a credential leak.
- Default SSH key detection (tries `~/.ssh/id_rsa`, `~/.ssh/id_ed25519`, etc.) How it starts
The opening of the file, as written. The whole thing — 223 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
DBHub Development Guidelines
DBHub is a zero-dependency, token efficient database MCP server implementing the Model Context Protocol (MCP) server interface. This lightweight server bridges MCP-compatible clients (Claude Desktop, Claude Code, Cursor) with various database systems.
Commands
- Build:
pnpm run build- Compiles TypeScript to JavaScript using tsup - Start:
pnpm run start- Runs the compiled server - Dev:
pnpm run dev- Runs server with tsx (no compilation needed) - Test:
pnpm test- Run all tests - Test Watch:
pnpm test:watch- Run tests in watch mode - Integration Tests:
pnpm test:integration- Run database integration tests (requires Docker) - Claude Code Plugin:
plugin/packages DBHub as a Claude Code plugin —.mcp.jsonlaunchesnpx @bytebase/dbhub(pinned to the plugin version) against the bundled read-onlyplugin/dbhub.toml(DSN prompted viauserConfiginplugin/.claude-plugin/plugin.json, passed asDBHUB_DSN), plus/dbhub:setupand/dbhub:exploreskills. Validate withclaude plugin validate ./plugin; test withclaude --plugin-dir ./plugin. - Versioning:
package.jsonis the single source of truth.pnpm version <bump>bumps it and auto-runsscripts/sync-version.mjs, which propagates the version intoplugin/.claude-plugin/plugin.json,plugin/.mcp.json, andserver.json(files that can't be stamped at build time — the plugin is read straight from git with no build step, andserver.json's own version is what the npm publish workflow (.github/workflows/npm-publish.yml) checks against the MCP Registry before republishing — the registry publish runs as a post-step of that same workflow, after the npm publish succeeds).mcpb/manifest.jsonneeds no sync —scripts/build-mcpb.mjsstamps it frompackage.jsonat build time.src/__tests__/plugin-consistency.test.tsfails CI if any of these drift frompackage.json, or ifplugin/dbhub.tomldiverges frommcpb/dbhub.toml. - MCP Bundle:
pnpm run build:mcpb- Package DBHub as an.mcpbbundle for MCPB-compatible clients (Claude Desktop, Claude Code, MCP for Windows; seemcpb/andscripts/build-mcpb.mjs);pnpm run test:mcpbsmoke-tests the packed bundle over stdio. Published to GitHub releases by.github/workflows/mcpb-release.yml. The bundle is read-only by design (mcpb/dbhub.toml), with the DSN supplied via theDBHUB_DSNenv var declared inmcpb/manifest.json(TOML${ENV_VAR}interpolation).
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.
- 19d ago Changed · -1 lines · +103 tokens per session c384dbf003e9
- 26d ago Changed · +7 tokens per session 8c9f7a5051d8
- 27d ago Changed 3646d272ebf6
- 1mo ago Changed · +61 tokens per session d2c1dcaf9d92
- 1mo ago Changed · +2 lines · +81 tokens per session fd9e8892772f
- 2mo ago First seen · 222 lines · 3,646 tokens per session scan C b1697fa1ee0d
dbhub CLAUDE.md is an instructions file published in the GitHub repository bytebase/dbhub (3,749 stars, last pushed 3d ago), licensed MIT. It adds 3,898 tokens to every session, about $0.0156 per session on Opus 5.5. A static security scan graded it C with 1 finding (reaches for credential files). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.