MCP server

OpenCancer Official

ai.opencancer/opencancer

Checked 28 Oct 2026, 09:03 UTC · Connected to it and listed its tools

Cancer patient expert: NCCN-grounded answers with sources, recruiting trials, and expert review.

Website

At a glance

Type

MCP server

Publisher

opencancer.ai (verified by the MCP Registry)

Status

Working at last check

Tools

5

Token cost

About 1,470 tokens per request

Sets up in

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

Last checked

28 Oct 2026, 09:03 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 opencancer https://opencancer.ai/api/mcp

Claude Desktop

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

Codex (config.toml)

[mcp_servers.opencancer]
url = "https://opencancer.ai/api/mcp"

Gemini CLI

{"mcpServers":{"opencancer":{"httpUrl":"https://opencancer.ai/api/mcp"}}}

Cursor

{"mcpServers":{"opencancer":{"url":"https://opencancer.ai/api/mcp"}}}

VS Code

{"servers":{"opencancer":{"type":"http","url":"https://opencancer.ai/api/mcp"}}}

Antigravity

agy mcp add opencancer https://opencancer.ai/api/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":"opencancer","server_url":"https://opencancer.ai/api/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"opencancer","server_url":"https://opencancer.ai/api/mcp"}

Tools

• ask_opencancer ~369 tokens
  Answers a cancer patient or caregiver question in plain language, grounded in NCCN Guidelines for Patients and medical literature. Covers what a diagnosis, stage, biomarker or test result means; treatment options; side effects and their management; questions for the oncologist; second opinions; livi
• find_clinical_trials ~332 tokens
  Lists clinical trials recruiting now for a cancer type, from ClinicalTrials.gov, optionally near a city, state or country and filtered by a biomarker, drug or treatment keyword and by phase. Returns up to 8 trials with NCT number, phase, sponsor, the sites closest to the requested place, a registry
• get_trial_details ~164 tokens
  Returns one clinical trial from ClinicalTrials.gov by its NCT number: what it tests, phase, status, last registry update, ages, the inclusion and exclusion criteria in their original wording, recruiting sites with their status, study contacts, and the registry link. Eligibility is confirmed only by
• open_case ~250 tokens
  Returns a link where a patient can start an expert review of their case by OpenCancer and Cancer Commons scientists (records, options, trial shortlist, next step). The link only opens an intake page: no case is created and no records are sent. The patient enters their own details and personally conf
• send_feedback Sends messages · ~355 tokens
  Flags an OpenCancer answer for human expert review, or sends feedback to the OpenCancer team. Used when the user says an OpenCancer answer was wrong, unsafe, or incomplete, or wants to tell OpenCancer something (answer_id identifies the answer; message holds the user's words). Also used to report th

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