Why is Fetch (reference) MCP not working in ChatGPT (Codex)?

It failed in our test on Oct 20, 2026. Errors we observed: answer missing ['Example Domain']; no tool result containing ['Example Domain']; answer missing ['Example Domain']; no tool result containing ['Example Domain']

Fetch (reference) MCP not working in ChatGPT (Codex)? Fixes

Failed It failed in our test on Oct 20, 2026. Below is the exact setup we used in ChatGPT (Codex) (codex-cli 0.162.0-alpha.17.2), every error we saw, and what to check, all from our own run log.

Date tested: Oct 20, 2026 · From our harness, not the maker’s claims · How we test

1. Use the install config we tested in ChatGPT (Codex)

[mcp_servers.ref-fetch]
command = "uvx"
args = ["mcp-server-fetch", "--allow-private-ips"]

Replace any <YOUR_…> placeholder and local test paths with your own. Every client’s tested snippet is on the Fetch (reference) page.

2. Check that ChatGPT (Codex) connects to it

In our run the connect check was OK (connect time not recorded). Our check output:

server answered tool calls during the task

Errors we observed

agent task: page read: answer missing ['Example Domain']; no tool result containing ['Example Domain']
agent task: page read (tool error during the run): answer missing ['Example Domain']; no tool result containing ['Example Domain']

Quoted from our run log. Secrets redacted. We list only what we saw.

More help

Fetch (reference): all results and setup · Full ChatGPT (Codex) run · General ChatGPT (Codex) MCP troubleshooting