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100
MCP MCP 2025-06-18 streamable-http

Proposition 65

dev.toolstop/prop65

Is a chemical on California's Proposition 65 list, and does it need a warning?

Uptime
66.7%
3 direct probes · 30d
Response
102ms
last probe
Tools
4
callable
Resources
0
readable
Prompts
0
available
Primary URL
https://prop65.toolstop.dev

Tools · 4

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 product sold into California needs a warning label. Returns ever…

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 to survey a family of related substances. Returns matching …

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 generally required twelve months after a chemical is listed, …

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 the data is before relying on a lookup, or to interpret the `A…

How to use

Add to your Claude Desktop / Cursor / Cline MCP config:

{
  "mcpServers": {
    "proposition_65": {
      "url": "https://prop65.toolstop.dev",
      "transport": "streamable-http"
    }
  }
}