Chemical Safety Intelligence

Chemical safety and industrial regulatory intelligence MCP server.

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What it can do

  • Check Chemical: Check chemical hazard and regulatory records by substance name or CAS number. Use when the user asks if a chemical is SVHC-listed, NIOSH-listed, GHS-classified, ICSC-covered, occupatio
  • Check Svhc List: Screen a list of substances against the EU ECHA SVHC Candidate List. Use when the user provides multiple chemical names or CAS numbers and asks which are SVHCs, REACH candidates, rest
  • Search Chemicals: Search chemical safety datasets by hazard keyword, exposure route, organ effect, or regulatory concept. Use when the user asks for chemicals related to carcinogenicity, respiratory e

What data it sees

Do you need an account

No: the server works without sign-in

Chemical safety and industrial regulatory intelligence MCP server. Check substances against the EU SVHC Candidate List, query NIOSH occupational exposure limits, GHS hazard classifications, and cross-reference with 30,000+ cosmetic ingredients and 6,450+ food additives. Includes FDA GRAS notices. Built by Two Halves — twohalves.ai

How to connect

How to connect Chemical Safety Intelligence to Claude

The server address to paste into Claude settings:

https://chemical-safety--twohalves.run.tools

  1. Open Claude (claude.ai or the desktop app).
  2. Go to Settings → Connectors.
  3. Click Add custom connector.
  4. Paste the server address copied below into Remote MCP server URL and click Add.
  5. In a chat, click + → Connectors and switch the new connector on.

Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

Authorization

After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

How to connect Chemical Safety Intelligence to ChatGPT

The server address to paste into ChatGPT settings:

https://chemical-safety--twohalves.run.tools

  1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
  2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
  3. Open Settings → Connectors and click Create.
  4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
  5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
  6. In a new chat open + → Apps/Connectors and enable the connector.

OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

Authorization

On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

How to connect Chemical Safety Intelligence to Cursor

The server address to paste into Cursor settings:

https://chemical-safety--twohalves.run.tools

Fastest: click Open in Cursor below and confirm the prompt.

Manually:

  1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
  2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
  3. Save the file. The server appears in the MCP list; authorize it there if asked.

Authorization

If the service needs sign-in, an authorize button appears next to the server in the MCP list.

Server tool list (3)

Raw names from tools/list. Only developers need these.

check_chemicalCheck chemical hazard and regulatory records by substance name or CAS number. Use when the user asks if a chemical is SVHC-listed, NIOSH-listed, GHS-classified, ICSC-covered, occupationally hazardous, or relevant to cosmetic/food safety cross-references. Do not use for batch SVHC screening, broad hazard discovery without a substance name, cosmetic formula checks, food additive safety, or drug interaction questions. The response includes identifiers, ECHA SVHC status, NIOSH REL/PEL/IDLH data, GHS classifications, ICSC safety-card fields, and cosmetic/food cross-reference matches.
check_svhc_listScreen a list of substances against the EU ECHA SVHC Candidate List. Use when the user provides multiple chemical names or CAS numbers and asks which are SVHCs, REACH candidates, restricted substances, or substances of very high concern. Do not use for one-off full hazard profiles, NIOSH/GHS/ICSC exploration, or non-EU regulatory questions that are not SVHC checks. The response includes per-substance match status, resolved identifiers, SVHC inclusion details, reason fields, dates, and source links where available.
search_chemicalsSearch chemical safety datasets by hazard keyword, exposure route, organ effect, or regulatory concept. Use when the user asks for chemicals related to carcinogenicity, respiratory effects, liver toxicity, skin sensitization, endocrine activity, GHS phrases, NIOSH topics, or SVHC categories. Do not use when the user has a single exact substance to profile or a list to screen only for SVHC status. The response includes ranked matches from SVHC, NIOSH, GHS, and ICSC sources with dataset labels, identifiers, hazard snippets, and source-specific fields.