Does Jupyter MCP work with ChatGPT (Codex)?
Not in our test. Jupyter MCP installed in ChatGPT (Codex) but failed our agent task on Oct 15, 2026. Details of what went wrong are below.
Result
ResultFailed
Date testedOct 15, 2026
Plan tested onChatGPT Plus
App versioncodex-cli 0.162.0-alpha.17.2
Modelaccount default (ChatGPT Plus)
Steps
- install OK
- connected Not run
- tools visible Not run
- agent task: run cell FailedWhy it failed: no successful call to this server's tools; answer missing ['42']; no tool result containing ['42']
From our own harness run, not the maker’s claims. How we test.
What happened in this run
Install config we used
[mcp_servers.jupyter]
command = "uvx"
args = ["jupyter-mcp-server"]
env = {JUPYTER_URL="http://127.0.0.1:8888",JUPYTER_TOKEN="•••",DOCUMENT_URL="http://127.0.0.1:8888",DOCUMENT_TOKEN="•••",RUNTIME_URL="http://127.0.0.1:8888",RUNTIME_TOKEN="•••",DOCUMENT_ID="notebook.ipynb",ALLOW_IMG_OUTPUT="false"}Connection check
no tool call reached the serverTools check
checked in task step
Raw details from our harness log for this run. Secrets redacted.
Set it up in ChatGPT (Codex)
Copy-paste config for every app is on the Jupyter MCP page. Not connecting? ChatGPT (Codex) MCP troubleshooting.
Other apps we tested it in: Claude Code (passed) · Cursor (passed).