MCP server

Cactus

io.github.pipeworx-io/cactus

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

NCI CACTUS Chemical Identifier Resolver MCP.

Website Source

At a glance

Type

MCP server

Publisher

pipeworx.io (verified by the MCP Registry)

Status

Working at last check

Tools

44

Token cost

About 26,744 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http cactus https://gateway.pipeworx.io/cactus/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.cactus]
url = "https://gateway.pipeworx.io/cactus/mcp"

Gemini CLI

{"mcpServers":{"cactus":{"httpUrl":"https://gateway.pipeworx.io/cactus/mcp"}}}

Cursor

{"mcpServers":{"cactus":{"url":"https://gateway.pipeworx.io/cactus/mcp"}}}

VS Code

{"servers":{"cactus":{"type":"http","url":"https://gateway.pipeworx.io/cactus/mcp"}}}

Antigravity

agy mcp add cactus https://gateway.pipeworx.io/cactus/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"cactus","server_url":"https://gateway.pipeworx.io/cactus/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"cactus","server_url":"https://gateway.pipeworx.io/cactus/mcp"}

Tools

• identify ~175 tokens
  NCI CACTUS one-shot lookup: given any chemical identifier (name, CAS, SMILES, InChI, or InChIKey), return SMILES, InChIKey, IUPAC name, molecular formula, molecular weight, and CAS number in a single call. Fields that cannot be resolved are returned as null. Keyless, plain-text API.
• resolve ~266 tokens
  NCI CACTUS chemical identifier resolver. Convert one chemical identifier (a drug/chemical name, CAS number, SMILES, InChI, or InChIKey) into a single representation: smiles (canonical SMILES), stdinchi (standard InChI), stdinchikey (standard InChIKey), iupac_name, names (synonym list), formula (mole

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