Does Open-WebSearch work with ChatGPT (Codex)?
Yes. Open-WebSearch passed every step of our test in ChatGPT (Codex) on Oct 14, 2026: it installed, connected, its tools were visible, and an agent used it to finish a real task.
Result
ResultPassed
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 OK
- agent task: web search OKlive keyless web search
- agent task: page read OKfetch a public page and return its content
From our own harness run, not the maker’s claims. How we test.
What happened in this run
Install config we used
[mcp_servers.open-websearch]
command = "npx"
args = ["-y", "open-websearch@latest"]
env = {MODE="stdio",DEFAULT_SEARCH_ENGINE="duckduckgo"}Connection check
server answered tool calls during the taskTools check
verified via task step: agent saw and called the server's tools
Agent task: web search
- Tool calls, in order:
open-websearch:search,open-websearch:search
Agent task: page read
- Tool calls, in order:
open-websearch:fetchWebContent,open-websearch:fetchWebContent
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 Open-WebSearch page. Not connecting? ChatGPT (Codex) MCP troubleshooting.
Other apps we tested it in: Claude Code (passed) · Cursor (passed) · Claude Desktop (passed).