Does MarkItDown MCP (Microsoft) work with ChatGPT (Codex)?
Not in our test. MarkItDown MCP (Microsoft) installed in ChatGPT (Codex) but failed our agent task on Oct 14, 2026. Details of what went wrong are below.
Result
ResultFailed
Date testedOct 14, 2026
Plan tested onChatGPT Plus
App versioncodex-cli 0.162.0-alpha.17.2
Modelaccount default (ChatGPT Plus)
Steps
- install OK
- connected OK
- tools visible Failed
- agent task: page read Failedfetch a public page and return its contentWhy it failed: answer missing ['Example Domain']; no tool result containing ['Example Domain']
From our own harness run, not the maker’s claims. How we test.
What happened in this run
Install config we used
[mcp_servers.markitdown]
command = "uvx"
args = ["markitdown-mcp"]Connection check
server answered tool calls during the taskTools check
checked in task step
Agent task: page read
- Tool calls, in order:
markitdown:convert_to_markdown,markitdown:convert_to_markdown
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 MarkItDown MCP (Microsoft) page. Not connecting? ChatGPT (Codex) MCP troubleshooting.
Other apps we tested it in: Claude Code (failed) · Cursor (failed) · Claude Desktop (failed).