GroundTruth-MCP is a self-hosted MCP server that fetches live, up-to-date documentation and audits your code against 445+ curated libraries and 107+ audit patterns — no rate limits or API keys required.

• Route queries automatically (gt_dispatch): Use plain-text like "use gt for react" and it routes to the right tool with the right arguments.

• Resolve libraries (gt_resolve_library): Look up any library by name to get a validated ID, docs URL, and metadata. Falls back to npm, PyPI, crates.io, and pkg.go.dev.

• Batch resolve (gt_batch_resolve): Resolve up to 20 library names to IDs in one call.

• Fetch live documentation (gt_get_docs): Get current docs for any library on a specific topic, prioritizing llms.txt, Jina Reader, then GitHub README. Supports version pinning.

• Get best practices (gt_best_practices): Fetch patterns, anti-patterns, and configuration guidance targeting best-practices pages, guides, and performance tips.

• Auto-scan project dependencies (gt_auto_scan): Reads manifest files (package.json, requirements.txt, Cargo.toml, go.mod, etc.) and fetches best practices for every detected dependency.

• Search any topic (gt_search): Search across OWASP, MDN, web.dev, W3C, AI provider docs, and more — covering security, accessibility, performance, web standards, and beyond.

• Audit your code (gt_audit): Scan source files with 107+ patterns across 18 categories (security, accessibility, React, Next.js, TypeScript, Node.js, Python, Vue, Svelte, Angular, testing, performance, and more), pinpointing issues at exact file:line locations with live fix guidance.

• Fetch changelogs (gt_changelog): Get release notes for any library version before upgrading, from GitHub Releases, CHANGELOG.md, or the docs site.

• Check compatibility (gt_compat): Verify browser, Node.js, or runtime support for web APIs, CSS features, or JS syntax via MDN and caniuse.com.

• Compare libraries (gt_compare): Compare 2–3 libraries side-by-side with live docs, filtered by specific criteria (e.g. bundle size, TypeScript support, DX).

• Find real-world code examples (gt_examples): Search GitHub for actual usage examples from popular open-source projects, with repository attribution.

• Get migration guides (gt_migration): Fetch step-by-step instructions, breaking changes, and upgrade guides when migrating between library versions.

• Get code snippets (gt_snippets): Retrieve ranked code snippets from a library's own documentation, cached per library/version for instant retrieval, filterable by topic and language.

Provides documentation and best practices for Cloudflare services, including Cloudflare Workers.

Provides documentation, best practices, and compatibility checks for Cloudflare Workers.

Provides access to CSS specifications, browser compatibility data, best practices, and audit patterns for CSS code.

Provides documentation and best practices for Docker containerization and Dockerfile optimization.

Provides documentation, migration guides, and code examples for Drizzle ORM.

Provides documentation, best practices, and audit patterns for Expo and React Native mobile development.

Provides documentation, best practices, and code examples for Express.js web framework.

Provides documentation, best practices, and audit support for FastAPI Python web framework.

Provides documentation and best practices for Firebase services, including authentication, Firestore, and cloud functions.

Provides access to GitHub repository documentation, README files, release notes, and code examples via the GitHub API.

Provides documentation and best practices for GitHub Actions CI/CD workflows.

Provides documentation and best practices for Gmail API integration and email handling.

Provides documentation and best practices for Google APIs, including Maps, Analytics, Ads, Cloud, and other Google services.

Provides documentation and best practices for Google Cloud Platform services such as Compute Engine, Cloud Storage, and Vertex AI.

Provides documentation and best practices for Google Gemini AI API, including function calling and model capabilities.

Provides documentation, code examples, and best practices for Hono web framework.

Provides documentation and best practices for Kubernetes deployment, configuration, and management.

Provides documentation and best practices for LangChain LLM application framework.

Provides documentation, best practices, and audit support for NestJS framework.

Provides documentation, best practices, migration guides, and audit patterns for Next.js framework.

Provides documentation, best practices, and audit support for Node.js runtime, including security and performance patterns.

Provides fallback documentation and package metadata for npm packages.

Provides documentation and best practices for OpenAI API, including models and function calling.

Provides documentation, best practices, and configuration guidance for OpenTelemetry observability framework.

Provides documentation and best practices for OWASP security guidelines, including SQL injection prevention, XSS, and authentication.

Provides documentation, best practices, and comparison support for Prisma ORM.

Provides fallback documentation and package metadata for PyPI Python packages.

Provides documentation, best practices, and audit support for Python, including security and performance patterns.

Provides documentation, best practices, and audit patterns for React, including hooks, component patterns, and React 19 migration.

Provides browser compatibility data and documentation for Safari web features.

Provides documentation, best practices, and audit support for Tailwind CSS, including migration from v3 to v4.

Provides documentation and best practices for Terraform infrastructure-as-code.

Provides documentation, best practices, and audit patterns for TypeScript, including type safety and code quality rules.

Provides documentation and best practices for WebAuthn and passkey authentication.

Provides documentation and best practices for WebRTC real-time communication API.

Provides documentation and best practices for YouTube Data API and embedded player integration.

claude mcp add gt -- npx -y @groundtruth-mcp/gt-mcp@latest

{
 "mcpServers": {
 "gt": {
 "command": "npx",
 "args": ["-y", "@groundtruth-mcp/gt-mcp@latest"]
 }
 }
}

# Claude Code
claude mcp add gt -e GT_GITHUB_TOKEN=ghp_yourtoken -- npx -y @groundtruth-mcp/gt-mcp@latest

# Cursor / Claude Desktop / VS Code — add env to your config:
"env": { "GT_GITHUB_TOKEN": "ghp_yourtoken" }

use gt for nextjs
use gt for drizzle migrations
gt audit
use gt to check WCAG focus indicators
use gt for OpenTelemetry setup
find all issues and fix with gt
use gt for Google Gemini API
use gt for Claude tool use

gt_resolve_library({ libraryName: "nestjs" })
gt_get_docs({ libraryId: "nestjs/nest", topic: "guards" })
gt_best_practices({ libraryId: "vercel/next.js", topic: "caching" })
gt_auto_scan({ projectPath: "." })
gt_search({ query: "OWASP SQL injection prevention" })
gt_audit({ projectPath: ".", categories: ["security", "accessibility"] })
gt_changelog({ libraryId: "vercel/next.js", version: "15" })
gt_compat({ feature: "CSS container queries", environments: ["safari"] })
gt_compare({ libraries: ["prisma", "drizzle-orm"], criteria: "TypeScript support" })
gt_examples({ library: "hono", pattern: "middleware" })

gt_audit({ categories: ["all"] }) // all 18 categories
gt_audit({ categories: ["security", "node"] }) // OWASP + Node.js
gt_audit({ categories: ["python", "security"] }) // Python OWASP scan
gt_audit({ categories: ["accessibility"] }) // WCAG AA
gt_audit({ categories: ["typescript", "react"] }) // type safety + React rules

## [CRITICAL] SQL built via template literal
Category: security | Severity: critical | Count: 2

Fix: db.query('SELECT * FROM users WHERE id = $1', [userId])

Files:
 - src/db/users.ts:47
 - src/api/search.ts:23

Live fix: OWASP SQL Injection Prevention Cheat Sheet

gt_auto_scan({ projectPath: "." })

gt_search({ query: "WCAG 2.2 focus indicators" })
gt_search({ query: "Core Web Vitals LCP optimization" })
gt_search({ query: "Claude tool use best practices" })
gt_search({ query: "Google Gemini API function calling" })
gt_search({ query: "JWT vs session cookies" })
gt_search({ query: "gRPC vs REST tradeoffs" })