auxiliar-mcp

MCP server that keeps your AI agent's infrastructure knowledge current.

Your agent still thinks SendGrid has a free tier. It doesn't (removed March 2025). It recommends Auth.js — which is in maintenance mode. It quotes Neon at $19/month — pricing is now usage-based from $0.

auxiliar-mcp gives your agent current, Chrome-verified data about 74 cloud services across 16 categories.

Install

# Claude Code
claude mcp add auxiliar -- npx auxiliar-mcp

# Or run directly
npx auxiliar-mcp

Tools

| Tool | What it does | |------|-------------| | recommend_service | Picks the best service based on your constraints (framework, budget, region, GDPR, edge, lock-in) | | get_pricing | Chrome-verified pricing — including JS-rendered pages agents can't read via WebFetch | | get_risks | Risk flags, gotchas, and recent breaking changes | | check_compatibility | Warns about known conflicts between services (e.g., Turso + Prisma needs adapter) | | setup_service | CLI commands, signup URLs, env vars, estimated setup time |

Example

Agent: "I need a database for my Next.js app. Budget is free, deployed to Cloudflare Workers."

→ recommend_service(need="database", framework="nextjs", constraints="edge, zero cold starts")

Returns:
{
  "provider": "turso",
  "reason": "Edge-native SQLite with zero cold starts and embedded replicas",
  "pricing": { "free_tier": "5 GB storage, 100 databases" },
  "risks": ["Not PostgreSQL — limited ORM support"],
  "migration_difficulty": "high",
  "key_features": ["SQLite/libSQL", "embedded replicas", "zero cold starts"],
  "mcp_available": false,
  "cli_available": true,
  "cli_install": "brew install tursodatabase/tap/turso",
  "alternatives": [
    { "provider": "neon", "trade_off": "Has cold starts on free tier" }
  ]
}

Services Covered

Database: Neon, Supabase, Turso, PlanetScale, Render Postgres, AWS RDS, Railway Postgres, Cloudflare D1 Email: Resend, Postmark, SendGrid, AWS SES, Mailgun, Listmonk Auth: Better Auth, Clerk, Auth0, Firebase Auth, Supabase Auth, Auth.js Payments: Stripe, Lemon Squeezy, Paddle, RevenueCat Deploy: Vercel, Railway, Render, Fly.io Search: Algolia, Typesense, Meilisearch, PostgreSQL FTS CMS: Sanity, Contentful, Strapi, Payload, Keystatic, Directus, Ghost Monitoring: Sentry, Datadog, PostHog, Grafana Cloud, BetterStack, Highlight.io Storage: Cloudflare R2, AWS S3, Uploadthing, MinIO Cache: Upstash Redis, Momento, Dragonfly Queues: BullMQ, Inngest, Trigger.dev, AWS SQS, CloudAMQP Vector DB: Pinecone, Weaviate, Qdrant, Chroma LLM APIs: OpenAI, Anthropic, Google AI, Groq, Together AI, Ollama SMS: Twilio, Vonage, MessageBird Feature Flags: LaunchDarkly, Statsig, Flagsmith, Unleash Cron: Inngest, Trigger.dev, QStash, Vercel Cron, Cloudflare Cron

Data Quality

• Pricing verified by browsing actual service websites (Chrome DevTools, not WebFetch)
• Updated March 2026
• Tested with 50+ agent runs across 8 iterations
• Scores 9/10 on recommendation accuracy
• 47 category aliases (agents can query "llm-api", "file-storage", "vector-db", etc.)
• 27 compatibility rules with cross-service conflict detection

Constraints You Can Use

| Constraint | Example | |-----------|---------| | Framework | framework: "nextjs", "sveltekit", "fastapi", "express" | | Budget | budget: "free", "cheap", "enterprise" | | Region | region: "eu" | | GDPR | constraints: "GDPR" | | Edge | constraints: "edge, zero cold starts, cloudflare workers" | | Lock-in | constraints: "no vendor lock-in, portable" | | Features | constraints: "branching, webhooks, inbound email" |

Privacy

The MCP server pings auxiliar.ai/api/ on each tool call for analytics. Only query parameters are sent (e.g., ?need=database&framework=nextjs). No personal data, no API keys, no project info. Works offline with bundled data if the ping fails.

Links

• auxiliar.ai — comparison site with full service entries
• GitHub

License

MIT