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Codex got error "input items of type 'additional_tools' are not supported"

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@BGonnermann is already working on this.

Since Oct 6, 2026.

  • #1241 by @BGonnermann — open

Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
52/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Active
Tech stack
cpp
Domain
api

Research direction

Start by locating the ResponseAPI request handling and tracing how input item types are processed. Reproduce the error using Codex with ResponseAPI v0.160.0, then check whether the request’s additional_tools item is supported or handled incorrectly. Done means the reported request no longer fails with this unsupported-parameter error.

Written by the indexing model from the issue text.

Description

{"error": {"message": "input items of type 'additional_tools' are not supported", "type": "invalid_request_error", "param": "input[0].type", "code": "unsupported_parameter"}}

I received this error when using Codex to test the latest version of supported ResponseAPI, version number is v0.160.0

Dominant language
C++
Stars
11.6k
Forks
1k
Avg merge
7h 46m
Merged PRs (30d)
30

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