sylex-search

Sylex Search

Universal search engine for AI agents. Discover products, services, and businesses across every category through MCP.

11,000+ entries and growing. Zero cost per query, millisecond responses.

Quick start

Option 1: Remote (no install)

Add to your MCP client config (Claude Desktop, Cursor, etc.):

{
  "mcpServers": {
    "sylex-search": {
      "url": "https://mcp-server-production-38c9.up.railway.app/sse"
    }
  }
}

Option 2: Local stdio proxy (this package)

{
  "mcpServers": {
    "sylex-search": {
      "command": "npx",
      "args": ["sylex-search"]
    }
  }
}

Tools

Search & browse

Tool	Description
discover	Search the index. Returns ranked results with fit scores.
details	Get full product data by ID.
compare	Side-by-side comparison of 2-5 products.
categories	Browse all categories and subcategories.
alternatives	Find similar products to a given one.
feedback	Report issues or suggest improvements.

Self-service registration (agents-first)

Tool	Description
register	Register a new product, service, or business. Returns an owner_token for future updates.
claim	Claim ownership of an existing listing (or recover a lost token) via URL verification.
update_listing	Update your listing (name, description, category, pricing, etc). Requires owner_token.
list_mcp	Add MCP connection config so other agents can discover and connect to your server. Requires owner_token.

How registration works

Everything is designed for agents. No dashboards, no accounts — just MCP tools.

1. Register a new listing

Call register with a name, description, and URL. You get back:

• product_id — your listing's ID in the index
• owner_token — a secret token (like sylex_Kx7m2...) that proves you own this listing

Store the owner_token. You need it every time you update your listing.

2. Claim an existing listing

If your tool is already in the index (from our crawlers), use claim to take ownership:

• Call claim with just the product_id — you get a verification code and instructions
• Place the code somewhere you control:
  • GitHub: add it to your repo description or a SYLEX_VERIFY file
  • npm: add "sylexVerify": "<code>" to package.json
  • Website: serve it at /.well-known/sylex-verify
  • DNS: add a _sylex-verify TXT record
• Call claim again with the product_id + verification_url — we fetch the URL and check for the code
• You get back an owner_token

3. Update your listing

Call update_listing with your product_id, owner_token, and an updates object. You can change:

• Index fields: name, description, url, category, subcategory, price_model, has_free_tier
• Custom data: any other keys go into the data blob (features, integrations, etc.)

4. Publish your MCP config

Call list_mcp to add connection details so other agents can discover and connect to your MCP server:

SSE:              {"transport": "sse", "url": "https://your-server/sse"}
stdio:            {"transport": "stdio", "command": "npx", "args": ["your-package"]}
streamable-http:  {"transport": "streamable-http", "url": "https://your-server/mcp"}

You can also include "tools" (list of tool names) and "env" (required environment variables).

Lost your token?

Call claim again on your product, even if it's already claimed. Re-verify ownership through any of the methods above, and a new token is issued. The old token stops working immediately.

Example queries

• "react state management" — zustand, redux, mobx, jotai
• "python web framework" — Django, Flask, FastAPI
• "database" — PostgreSQL, MongoDB, MySQL, Redis
• "project management" — Jira, Notion, Asana, Linear

Environment variables

Variable	Default	Description
SYLEX_SEARCH_URL	Production server	Override the server URL
PRODUCT_SEARCH_URL	Production server	Legacy alias (backward compat)

License

AGPL-3.0 — see LICENSE for details.