MCP servers for ChatGPT (Codex) · Utilities
Best utilities MCP server for ChatGPT (Codex), tested
In ToolPassed's hands-on tests in ChatGPT (Codex), Time (reference) is our provisional candidate for utilities: it passed install, connect, tools and an agent task on 2026-10-19. We ran 5 utilities MCP servers in ChatGPT (Codex); 5 passed every step.
Last tested · runs from 2026-10-19 to 2026-10-20 · one run per server · How we test
Results in ChatGPT (Codex)
| Server | ChatGPT (Codex) |
|---|---|
| Time (reference) Utilities | Passed 2026-10-19 · install, connect, tools, agent task |
| Time MCP (yokingma) Utilities | Passed 2026-10-19 · install, connect, tools, agent task |
| MCP Time (TheoBrigitte) Utilities | Passed 2026-10-19 · install, connect, tools, agent task |
| Viajante Utilities | Passed 2026-10-19 · install, connect, tools, agent task |
| Desktop Commander Utilities | Passed 2026-10-20 · install, connect, tools, agent task |
Dated results
- Time (reference) passed in ChatGPT (Codex) on 2026-10-19 (Codex CLI 0.162.0-alpha.17.2, mcp-server-time 2026.10.19, connect time not recorded). Full result
- Time MCP (yokingma) passed in ChatGPT (Codex) on 2026-10-19 (Codex CLI 0.162.0-alpha.17.2, time-mcp 1.0.6, connect time not recorded). Full result
- MCP Time (TheoBrigitte) passed in ChatGPT (Codex) on 2026-10-19 (Codex CLI 0.162.0-alpha.17.2, @theo.foobar/mcp-time v0.4.0, connect time not recorded). Full result
- Viajante passed in ChatGPT (Codex) on 2026-10-19 (Codex CLI 0.162.0-alpha.17.2, @viajante/mcp 1.5.2, connect time not recorded). Full result
- Desktop Commander passed in ChatGPT (Codex) on 2026-10-20 (Codex CLI 0.162.0-alpha.17.2, @wonderwhy-er/desktop-commander 0.3.0, connect time not recorded). Full result
Why Time (reference) is the candidate
Time (reference) passed every step in ChatGPT (Codex). It is the group’s site-wide candidate (judged 2026-10-21): Returned the current UTC time in both Claude Code and Cursor in 2 calls in total, from a local server with no network or key. Time MCP (yokingma) and MCP Time (TheoBrigitte) also passed both with 2 calls each, and Viajante passed its airport lookup with 2 calls, so this is a tie; Time gets the nod for the smallest tool list (2, vs 5 for MCP Time and 6 for Time MCP). On Oct 19 Time 2026.10.19 (new release) was retested and passed again in Claude Code and Cursor. Confirmed Oct 21, 2026: a second run in Claude Code and Cursor on mcp-server-time 2026.10.19 passed again.
Provisional: based on one dated run per app (no repeat runs yet), so treat it as a candidate, not a final pick. How we test.
Same servers in all 4 apps
| Server | Claude Code | Cursor | Claude Desktop | ChatGPT (Codex) |
|---|---|---|---|---|
| Time (reference) Utilities | Passed 2026-10-21 · install, connect, tools, agent task | Passed 2026-10-21 · install, connect, tools, agent task | Passed 2026-10-19 · install, connect, tools, agent task | Passed 2026-10-19 · install, connect, tools, agent task |
| Time MCP (yokingma) Utilities | Passed 2026-10-15 · install, connect, tools, agent task | Passed 2026-10-15 · install, connect, tools, agent task | Passed 2026-10-19 · install, connect, tools, agent task | Passed 2026-10-19 · install, connect, tools, agent task |
| MCP Time (TheoBrigitte) Utilities | Passed 2026-10-15 · install, connect, tools, agent task | Passed 2026-10-15 · install, connect, tools, agent task | Passed 2026-10-18 · install, connect, tools, agent task | Passed 2026-10-19 · install, connect, tools, agent task |
| Viajante Utilities | Passed 2026-10-15 · install, connect, tools, agent task | Passed 2026-10-15 · install, connect, tools, agent task | Passed 2026-10-19 · install, connect, tools, agent task | Passed 2026-10-19 · install, connect, tools, agent task |
| Desktop Commander Utilities | Partial 2026-10-15 · verified connected, install; agent task not run | Partial 2026-10-15 · verified connected, install, tools visible; agent task not run | Passed 2026-10-19 · install, connect, tools, agent task | Passed 2026-10-20 · install, connect, tools, agent task |
What failed or is partial in ChatGPT (Codex)
None of these servers failed in ChatGPT (Codex).
Install in ChatGPT (Codex)
The exact snippet we tested is on the Time (reference) page (pick the ChatGPT (Codex) tab). Not connecting? ChatGPT (Codex) MCP troubleshooting.
Not tested in ChatGPT (Codex) yet
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Questions
What is the best utilities MCP server for ChatGPT (Codex)?
In ToolPassed's hands-on tests in ChatGPT (Codex), Time (reference) is our provisional candidate for utilities: it passed install, connect, tools and an agent task on 2026-10-19. We ran 5 utilities MCP servers in ChatGPT (Codex); 5 passed every step.
Does Time (reference) work with ChatGPT (Codex)?
Time (reference) passed in ChatGPT (Codex) on 2026-10-19 (Codex CLI 0.162.0-alpha.17.2, mcp-server-time 2026.10.19, connect time not recorded).
More: all MCP servers tested in ChatGPT (Codex) · Utilities in every app · How we test
