The Proposition 65 MCP server,
connected in one click.
Is a chemical on California's Proposition 65 list, and does it need a warning? Connect the official Proposition 65 MCP server to Claude, ChatGPT, or Cursor through gate — one gateway URL, no config files, security-checked.
Free to start · No credit card · No hosting needed
Add Proposition 65 to your AI in one minute
Pick your client. Copy, paste, done — or let gate handle sign-ins and policies for you.
claude mcp add --transport http proposition-65 https://prop65.toolstop.devRun in your terminal, then restart Claude Code.
Proposition 65 · https://prop65.toolstop.dev
What your AI can do with Proposition 65
Real prompts you can type the moment it's connected — no setup, no docs to read.
“Use “check_prop65”: Look up a chemical by CAS number or name and report whether it is on California's Proposition 65 list. Use this when deciding whether a prod.”
“Use “search_prop65”: Search the Proposition 65 list for chemicals whose name contains a fragment. Use this when you do not have an exact name or a CAS number, or.”
“Use “list_recent_listings”: List the chemicals added to Proposition 65 on or after a given year. Use this to find recent additions, which matters because a warning is g.”
“Use “describe_prop65_list”: Report the size and edition of the embedded Proposition 65 list, and what the listing-mechanism codes mean. Use this to check how current th.”
How secure is the Proposition 65 MCP server?
Every server in the gate directory has to pass the same four checks before your AI can touch it. Here's how Proposition 65 holds up.
Official endpoint
Operated by Proposition 65 (toolstop.dev) at its documented MCP endpoint — not a third-party mirror or community re-host.
No sign-in needed
This server only exposes public data — no account and no credentials are involved when you connect.
Scanned before it goes live
gate checks every tool for prompt injection, hidden instructions, data-exfiltration hints, and over-broad permissions before the server is available through your gateway.
Watched for drift
If Proposition 65 adds or changes tools later, gate re-scans and alerts you — before your AI acts on the change.
Connected in three steps
Connect your gate
Add one gateway URL to Claude, ChatGPT, or any MCP client. One-time setup, about two minutes.
Pick Proposition 65
Choose Proposition 65 in the gate directory. No sign-in needed.
Use it anywhere
Proposition 65's tools are live in every AI client you've connected — with rules and logging built in.
Free to start · No credit card · No hosting needed
The actual tools Proposition 65 exposes
Fetched live from the official endpoint and re-checked daily by gate — not marketing copy.
check_prop65 — Look up a chemical by CAS number or name and report whether it is on California's Proposition 65 list. Use this when deciding whether a prod
search_prop65 — Search the Proposition 65 list for chemicals whose name contains a fragment. Use this when you do not have an exact name or a CAS number, or
list_recent_listings — List the chemicals added to Proposition 65 on or after a given year. Use this to find recent additions, which matters because a warning is g
describe_prop65_list — Report the size and edition of the embedded Proposition 65 list, and what the listing-mechanism codes mean. Use this to check how current th
Who runs the Proposition 65 MCP server?
The Proposition 65 MCP server at a glance
https://prop65.toolstop.devQuestions, answered
Is there an official Proposition 65 MCP server?
Yes — Proposition 65 operates its own remote MCP server at prop65.toolstop.dev. gate connects you to that official endpoint and adds security scanning, per-tool access rules, and an activity log on top.
How do I connect Proposition 65 to Claude or ChatGPT?
Add gate's gateway URL to your AI client once, then pick Proposition 65 in the directory. No account or sign-in is needed. From then on, Proposition 65's tools are available in every client you've connected to gate.
Do I need to host anything?
No. Proposition 65 runs the server, and gate is fully managed. You just connect one URL — there's nothing to install, deploy, or maintain.
Is the Proposition 65 MCP server safe to connect?
It's the vendor's official endpoint, and gate scans its tools for prompt injection and hidden instructions before it goes live, re-checks it whenever it changes, and lets you allow, block, or require approval for every single tool.
Is it free?
Yes — you can get started with gate for free and connect Proposition 65 in minutes. No credit card required.
Connect more than just Proposition 65
Every server below works through the same gateway URL — connect once, add tools anytime.
Squarespace DomainsDesignView →Set up Proposition 65 in: Claude · Claude Code · ChatGPT · Cursor · VS Code
Give your AI Proposition 65 — safely.
One URL. All MCPs. Full control. Free to start.
Get started free