How do I obtain a free API key for the EPA CTX services?

You must send an email to `ccte_api@epa.gov` to request an individual API key. The key is usually issued free of charge for research and professional use.

What is a DTXSID and how is it used?

DTXSID is the EPA Dashboard Chemical Identifier. It is the primary unique identifier used across all CompTox APIs to ensure precise substance identification.

Are the results returned in real-time from the EPA databases?

Yes, this agent queries the live CompTox Chemicals Dashboard APIs directly, ensuring you have the most up-to-date scientific data available from the CCTE.

EPA Computational Toxicology MCP Server for Claude Desktop 10 tools — connect in under 2 minutes

Name: EPA Computational Toxicology
Availability: InStock
Author: Vinkius

modelcontextprotocol.io/quickstart/user

Built by Vinkius GDPR 10 Tools IDE

Claude Desktop is Anthropic's native application for interacting with Claude AI models on macOS and Windows. It was the first consumer application to ship with built-in MCP support, making it the reference implementation for the Model Context Protocol standard.

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Vinkius Desktop App

The modern way to manage MCP Servers — no config files, no terminal commands. Install EPA Computational Toxicology and 2,500+ MCP Servers from a single visual interface.

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Classic Setup·json

{
  "mcpServers": {
    "epa-computational-toxicology": {
      // Your Vinkius token — get it at cloud.vinkius.com
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

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Ed25519Audit chain

<40msKill switch

Stream every event to Splunk, Datadog, or your own webhook in real-time

* Every MCP server runs on Vinkius-managed infrastructure inside AWS - a purpose-built runtime with per-request V8 isolates, Ed25519 signed audit chains, and sub-40ms cold starts optimized for native MCP execution. See our infrastructure

About EPA Computational Toxicology MCP Server

Connect to the US Environmental Protection Agency's (EPA) Center for Computational Toxicology and Exposure (CCTE) and explore a massive repository of chemical data through natural conversation.

Claude Desktop is the definitive way to connect EPA Computational Toxicology to your AI workflow. Add the Vinkius Edge URL to your config, restart the app, and Claude immediately exposes all 10 tools in the chat interface — ask a question, Claude calls the right tool, and you see the answer. Zero code, zero context switching.

What you can do

Chemical Search — Find substances by name, CAS Registry Number (CASRN), or DTXSID
Physicochemical Properties — Retrieve melting points, boiling points, logP, and water solubility
Hazard Assessments — Access toxicity values, NOAELs, and points-of-departure from ToxValDB
Exposure Predictions — Explore predicted exposure levels and product use categories via ExpoCast and CPDat
Bioactivity Screening — Analyze ToxCast/Tox21 high-throughput screening results for thousands of assays
Environmental Fate — Check persistence, transport, and biodegradation metrics

The EPA Computational Toxicology MCP Server exposes 10 tools through the Vinkius. Connect it to Claude Desktop in under two minutes — no API keys to rotate, no infrastructure to provision, no vendor lock-in. Your configuration, your data, your control.

How to Connect EPA Computational Toxicology to Claude Desktop via MCP

Follow these steps to integrate the EPA Computational Toxicology MCP Server with Claude Desktop.

Open Claude Desktop Settings

Go to Settings → Developer → Edit Config to open claude_desktop_config.json

Add the MCP Server

Paste the configuration above into the mcpServers section

Restart Claude Desktop

Close and reopen Claude Desktop to load the new server

Start using EPA Computational Toxicology

Look for the 🔌 icon in the chat — your 10 tools are now available

Why Use Claude Desktop with the EPA Computational Toxicology MCP Server

Claude Desktop by Anthropic provides unique advantages when paired with EPA Computational Toxicology through the Model Context Protocol.

Claude Desktop is the reference MCP client — it was designed alongside the protocol itself, ensuring the most complete and stable MCP implementation available

Zero-code configuration: add a server URL to a JSON file and Claude instantly discovers and exposes all available tools in the chat interface

Claude's extended thinking capability lets it reason through multi-step tool usage, chaining multiple API calls to answer complex questions

Enterprise-grade security with local config storage — your tokens never leave your machine, and connections go directly to the Vinkius Edge network

EPA Computational Toxicology + Claude Desktop Use Cases

Practical scenarios where Claude Desktop combined with the EPA Computational Toxicology MCP Server delivers measurable value.

Interactive data exploration: ask Claude to query DNS records, look up WHOIS data, and cross-reference results in a single conversation

Ad-hoc security audits: type a domain name and let Claude enumerate subdomains, check DNS history, and flag configuration anomalies — all through natural language

Executive briefings: generate comprehensive domain intelligence reports by asking Claude to compile findings into a formatted summary

Learning and training: new team members can explore API capabilities conversationally without needing to read documentation

EPA Computational Toxicology MCP Tools for Claude Desktop (10)

These 10 tools become available when you connect EPA Computational Toxicology to Claude Desktop via MCP:

get_bioactivity_summary

Retrieve a summary of high-throughput screening results from ToxCast/Tox21 assays

get_chemical_details

Get comprehensive metadata and identification details for a specific chemical using its DTXSID

get_chemical_lists

Identify which chemical lists (regulatory, research, or commercial) this chemical belongs to

get_chemical_synonyms

Retrieve all known synonyms and alternative names for a specific chemical

get_exposure_summary

Retrieve predicted exposure levels and product use data (ExpoCast/CPDat)

get_fate_and_transport

Retrieve environmental fate and transport data (e.g., half-life, bioconcentration)

get_hazard_summary

Retrieve a summary of toxicity values and hazard assessment data from ToxValDB

get_physicochemical_properties

Retrieve predicted and experimental physicochemical properties (e.g., melting point, logP, solubility) for a chemical

search_chemical_by_casrn

Search for chemicals by their CAS Registry Number (CASRN)

search_chemical_by_name

Search for chemicals by common, IUPAC, or synonym names in the EPA CompTox database

Example Prompts for EPA Computational Toxicology in Claude Desktop

Ready-to-use prompts you can give your Claude Desktop agent to start working with EPA Computational Toxicology immediately.

"Search for the chemical properties of Bisphenol A."

"What is the hazard summary for CAS 80-05-7?"

"Find predicted exposure data for DTXSID7020182."

Troubleshooting EPA Computational Toxicology MCP Server with Claude Desktop

Common issues when connecting EPA Computational Toxicology to Claude Desktop through the Vinkius, and how to resolve them.

Server not appearing after restart

Ensure the JSON is valid (no trailing commas). Check the file path: ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\\Claude\\ (Windows).

Authentication error

Verify your Vinkius token is correct. Go to cloud.vinkius.com to regenerate it if needed.

Tools not showing in chat

Click the 🔌 icon at the bottom of the chat input. If it shows 0 tools, the server may still be connecting — wait a few seconds.

EPA Computational Toxicology + Claude Desktop FAQ

Common questions about integrating EPA Computational Toxicology MCP Server with Claude Desktop.

How does Claude Desktop discover MCP tools?

When Claude Desktop starts, it reads the claude_desktop_config.json file and connects to each configured MCP server. It calls the tools/list endpoint to fetch the schema for every available tool, then surfaces them as clickable options in the chat interface via the 🔌 icon.

What happens if the MCP server is temporarily unavailable?

Claude Desktop handles disconnections gracefully — if the server is unreachable at startup, the tools simply won't appear. Once the server becomes available again, restarting Claude Desktop will re-establish the connection. There is no timeout penalty or error loop.

Can I connect multiple MCP servers simultaneously?

Yes. You can add as many servers as you need in the mcpServers section of the config file. Each server appears as a separate tool provider, and Claude can use tools from multiple servers in a single conversation turn.

Is there a limit on the number of tools per server?

Claude Desktop can handle hundreds of tools per server. However, for optimal LLM performance, Vinkius servers are designed to expose focused, well-documented tool sets rather than overwhelming the model with too many options.

Does Claude Desktop support Streamable HTTP transport?

Yes. Claude Desktop supports both SSE (Server-Sent Events) and the newer Streamable HTTP transport that Vinkius uses. Simply provide the server URL — Claude auto-negotiates the transport protocol.