MCP servers for ChatGPT (Codex) · Files & office documents
Best files & office documents MCP server for ChatGPT (Codex), tested
In ToolPassed's hands-on tests in ChatGPT (Codex), Filesystem (reference) is our provisional candidate for files & office documents: it passed install, connect, tools and an agent task on 2026-10-20. We ran 5 files & office documents MCP servers in ChatGPT (Codex); 4 passed every step; not a pass: Excel MCP (failed).
Last tested · runs from 2026-10-14 to 2026-10-22 · one run per server · How we test
Results in ChatGPT (Codex)
| Server | ChatGPT (Codex) |
|---|---|
| Filesystem (reference) Files & office documents | Passed 2026-10-20 · install, connect, tools, agent task |
| draw.io MCP (official) Files & office documents | Passed 2026-10-21 · install, connect, tools, agent task |
| Draw.io MCP Files & office documents | Passed 2026-10-14 · install, connect, tools, agent task |
| SEAL (sealnet-mcp) Files & office documents | Passed 2026-10-22 · install, connect, tools, agent task |
| Excel MCP Files & office documents | Failed 2026-10-21 · agent task failed (file not created: /workspace/timmy/harness/sandbox/office/out-codex.xlsx) |
Dated results
- Filesystem (reference) passed in ChatGPT (Codex) on 2026-10-20 (Codex CLI 0.162.0-alpha.17.2, @modelcontextprotocol/server-filesystem 2.0.0, connect time not recorded). Full result
- draw.io MCP (official) passed in ChatGPT (Codex) on 2026-10-21 (Codex CLI 0.162.0-alpha.17.2, @drawio/mcp 1.10.0, connect time not recorded). Full result
- Draw.io MCP passed in ChatGPT (Codex) on 2026-10-14 (Codex CLI 0.162.0-alpha.17.2, package version not recorded, connect time not recorded). Full result
- SEAL (sealnet-mcp) passed in ChatGPT (Codex) on 2026-10-22 (Codex CLI 0.162.0-alpha.17.2, sealnet-mcp 0.10.0, connect time not recorded). Full result
- Excel MCP failed in ChatGPT (Codex) on 2026-10-21 (Codex CLI 0.162.0-alpha.17.2, excel-mcp-server 2.2.2, connect time not recorded). Full result
Why Filesystem (reference) is the candidate
Filesystem (reference) passed every step in ChatGPT (Codex). It is the group’s site-wide candidate (judged 2026-10-22): Wrote a fresh code to a file and read it back in every client we test (Claude Code, Cursor, Claude Desktop and ChatGPT (Codex)), and the second runs in Claude Code, Cursor and ChatGPT (Codex) passed again. In Claude Code it needed the test folder added to permissions.additionalDirectories. Draw.io also passed in all 4 clients (one run each) but only with its editor open in a browser. Excel was the earlier pick: it passed twice in Claude Code and Cursor, but its second ChatGPT (Codex) run failed on Oct 21, 2026, so by judging rule 1 it now ranks below both.
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) |
|---|---|---|---|---|
| Filesystem (reference) Files & office documents | Passed 2026-10-19 · install, connect, tools, agent task | Passed 2026-10-19 · install, connect, tools, agent task | Passed 2026-10-14 · install, connect, tools, agent task | Passed 2026-10-20 · install, connect, tools, agent task |
| draw.io MCP (official) Files & office documents | 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 2026-10-21 · install, connect, tools, agent task | Passed 2026-10-21 · install, connect, tools, agent task |
| Draw.io MCP Files & office documents | Passed 2026-10-13 · install, connect, tools, agent task | Passed 2026-10-13 · install, connect, tools, agent task | Passed 2026-10-14 · install, connect, tools, agent task | Passed 2026-10-14 · install, connect, tools, agent task |
| SEAL (sealnet-mcp) Files & office documents | Passed 2026-10-22 · install, connect, tools, agent task | Passed 2026-10-22 · install, connect, tools, agent task | Not tested yet | Passed 2026-10-22 · install, connect, tools, agent task |
| Excel MCP Files & office documents | Passed 2026-10-21 · install, connect, tools, agent task | Passed 2026-10-21 · install, connect, tools, agent task | Passed 2026-10-14 · install, connect, tools, agent task | Failed 2026-10-21 · agent task failed (file not created: /workspace/timmy/harness/sandbox/office/out-codex.xlsx) |
What failed or is partial in ChatGPT (Codex)
- Excel MCP: failed on 2026-10-21. Recorded reason:
file not created: /workspace/timmy/harness/sandbox/office/out-codex.xlsx
Install in ChatGPT (Codex)
The exact snippet we tested is on the Filesystem (reference) page (pick the ChatGPT (Codex) tab). Not connecting? ChatGPT (Codex) MCP troubleshooting.
Not tested in ChatGPT (Codex) yet
Docling MCP, OpenTakeoff, Next AI Draw.io, Framelink Figma MCP, Markdownify MCP, Melso MCP, DropHTML, Excel MCP Server (real Excel on Windows). Listed from their source; no result in ChatGPT (Codex) yet.
Questions
What is the best files & office documents MCP server for ChatGPT (Codex)?
In ToolPassed's hands-on tests in ChatGPT (Codex), Filesystem (reference) is our provisional candidate for files & office documents: it passed install, connect, tools and an agent task on 2026-10-20. We ran 5 files & office documents MCP servers in ChatGPT (Codex); 4 passed every step; not a pass: Excel MCP (failed).
Does Filesystem (reference) work with ChatGPT (Codex)?
Filesystem (reference) passed in ChatGPT (Codex) on 2026-10-20 (Codex CLI 0.162.0-alpha.17.2, @modelcontextprotocol/server-filesystem 2.0.0, connect time not recorded).
Does Excel MCP work with ChatGPT (Codex)?
No, not in our test: Excel MCP failed in ChatGPT (Codex) on 2026-10-21 (Codex CLI 0.162.0-alpha.17.2, excel-mcp-server 2.2.2, connect time not recorded). Recorded reason: file not created: /workspace/timmy/harness/sandbox/office/out-codex.xlsx
More: all MCP servers tested in ChatGPT (Codex) · Files & office documents in every app · How we test
