Allergen Detector

io.github.daniellemeng1022Published by GitHub account daniellemeng1022v0.1.0Updated Oct 26, 2026

Checks food and cosmetic ingredients against each household member's allergies, incl. hidden names.

VerifiedStreamable HTTPWeb executable

Overview

Allergen Detector's hosted MCP server (allergen-detector-mcp.onrender.com); optional API key; Streamable HTTP; 3 tools.

No AI overview yet: these facts come from the registry entry and the server itself.

Endpoint
allergen-detector-mcp.onrender.com
Last checked

Installation

In SourceWeft

  1. Open Allergen Detector in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/io.github.daniellemeng1022%2Fallergen-detector/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "allergen-detector": {
      "type": "http",
      "url": "https://allergen-detector-mcp.onrender.com/mcp"
    }
  }
}

README

Allergen Detector MCP

The Allergen Detector matching engine as an MCP server, so AI assistants and shopping agents (ChatGPT, Claude, and others) can check a product against a household's allergies before recommending or buying it.

It uses the same matcher.js and allergen map as the Chrome extension (51 allergens, 1,078 names). The map refreshes daily from GitHub, so map updates reach agents with no redeploy.

Tools

ToolWhat it does
check_product_allergensChecks an ingredient list against one or more people's allergens (with severity) and returns who is affected, by which ingredient, and why. "Free from" claims never hide a real ingredient.
lookup_ingredientTells which allergen an ingredient name belongs to ("sodium caseinate" → milk).
list_supported_allergensLists the allergens the service covers.

The same checks are also a plain web API for agents that don't use MCP: POST /api/check, POST /api/lookup and GET /api/allergens, described at /openapi.json.

API keys are optional. Set API_KEYS="muse=<key>,acme=<key>" on the host to give each partner its own key, sent as X-API-Key or Authorization: Bearer. Requests without a key still work; a wrong key gets a 401. A valid key names the partner in /stats.

All tools are read-only and stateless. Nothing about the person (allergens, ingredients) is stored or logged. The only log is an anonymous count of tool calls per day, for measuring traction.

Run it

bash
npm installnpm test           # end-to-end test over MCPnpm start          # remote server: http://localhost:3000/mcpnpm run stdio      # local server for Claude Desktop and similarnpm run sync       # copy the latest matcher.js and map from the extension

To use it locally in Claude Desktop, add this to the mcpServers section of its config:

json
"allergen-detector": { "command": "node", "args": ["/path/to/allergen-mcp/server.js", "--stdio"] }

Launch steps

  1. Host it at a public HTTPS URL. Render or Fly.io can run npm start from a GitHub repo for $0–7/month. Later, point mcp.safi.ai at it.
  2. Privacy policy and terms page. Every directory requires one. Until safi.ai is live, host it on GitHub Pages. Its main point: no health data is stored.
  3. List it in the official MCP Registry (registry.modelcontextprotocol.io) with the mcp-publisher CLI, under io.github.daniellemeng1022/allergen-detector. Many clients and directories pull from it.
  4. Submit to the community directories: Smithery, Glama, PulseMCP and mcp.so.
  5. Claude: anyone can add it today as a custom connector by pasting the URL. To appear in Anthropic's connectors directory, submit it through their directory form.
  6. ChatGPT: test it in developer mode, then submit it as an app through OpenAI's Apps SDK submission process. This needs a verified developer account.
  7. Meta Muse (do this first): submit at muse.ai/platform. Choose "Existing MCP," enter the hosted URL, choose "API keys" and give Meta a key from API_KEYS (e.g. muse=…) so its calls show up as muse in /stats and payments to "no," then describe the service. Meta tests the live endpoint, so step 1 has to be done first. Muse already shops at Sephora, Walmart, Best Buy and the Shopify catalog, which covers both of our categories (cosmetics and food).
  8. Instinct and similar assistants: Instinct doesn't document custom MCP support. It shops through Shopify and Shop Pay. Reach out for a partnership instead.
  9. Shopping agents: contact teams building agentic-commerce products and offer the endpoint free during a pilot.
  10. Measure: set STATS_KEY on the host, then open https://<your-url>/stats?key=<STATS_KEY> to see calls by day, agent and tool. A connect count is an agent connecting; tool counts are real checks. /stats resets when the server restarts, but every count is also a [usage] JSON line in the host's logs. Track weekly checks and the number of distinct agents.

Before scaling

  • Add rate limiting and an API key for heavy business users. Keep a free tier.
  • Keep the disclaimer in every response. Don't present results as medical advice.

Source: README.md at commit 3963d31

Tools

3

check_product_allergens

Check a product for allergens

Check a product's ingredient list against the allergies of one or more people in a household. Catches allergens listed under other names (e.g. "arachis oil" for peanut, "casein" for milk, Latin plant names in cosmetics) and does not let "free from" claims hide a real ingredient. Covers food and cosmetics. Call this before recommending or buying a food, cosmetic or household product for someone with allergies.

Parametershouseholdrequiredingredientsrequiredproduct_name

lookup_ingredient

Look up an ingredient

Tell which allergens, if any, an ingredient name belongs to, e.g. "sodium caseinate" -> milk, "Prunus amygdalus dulcis oil" -> tree nuts, "DMDM hydantoin" -> formaldehyde releasers.

Parametersingredientrequired

list_supported_allergens

List supported allergens

List the allergens this service can check (food and cosmetic), with the other names users may type for them.

Takes no parameters.

Version history

1
  1. v0.1.0LatestOct 26, 2026

Score

90% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts

    Declare a license in the repository or the registry entry.