tools.web_search cannot be disabled when using reasoning_effort = minimal resulting in a failure
What version of Codex is running?
v0.46.0
Which model were you using?
gpt-5
What platform is your computer?
macos
What steps can reproduce the bug?
When launching Codex CLI v0.46.0 with reasoning_effort = minimal, the client still sends web_search tool in the request, resulting in a 400 Bad Request error. The flag tools.web_search=false (or equivalents) is ignored, so it’s impossible to run Codex in minimal mode offline.
Steps to reproduce
codex -m "gpt-5" \
--config model_reasoning_effort=minimal \
--config tools.web_search=false \
--sandbox read-only \
--ask-for-approval never -- "hello"Expected behavior
• The request should be accepted.
• web_search should be disabled (or omitted) in the request payload.
• Codex should operate with minimal reasoning and no web access.
Actual behavior
⚠️ stream error: unexpected status 400 Bad Request: {
"error": {
"message": "The following tools cannot be used with reasoning.effort 'minimal': web_search.",
"type": "invalid_request_error",
"param": "tools",
"code": null
}
}
What is the expected behavior?
web search shall be disabled in such scenario to avoid faiilure
What do you see instead?
⚠️ stream error: unexpected status 400 Bad Request: {
"error": {
"message": "The following tools cannot be used with reasoning.effort 'minimal': web_search.",
"type": "invalid_request_error",
"param": "tools",
"code": null
}
}
Additional information
The problem is happening even when web search is diabled in config.toml :
[tools]
web_search = false
2 Comments
this is happening with codex all the time for me...
• Model changed to gpt-5-codex with low reasoning
› hi
■ unexpected status 400 Bad Request: {"success":false,"error":{"issues":[{"code":"invalid_union_discriminator","options":
["function","web_search_preview","web_search_preview_2025_03_11","web_search","web_search_2025_08_26"],"path":["tools",5,"type"],"message":"Invalid discriminator value.
Expected 'function' | 'web_search_preview' | 'web_search_preview_2025_03_11' | 'web_search' | 'web_search_2025_08_26'"}],"name":"ZodError"}}
• Model changed to gpt-5-codex with high reasoning
› what does this do?
■ unexpected status 400 Bad Request: {"success":false,"error":{"issues":[{"code":"invalid_union_discriminator","options":
["function","web_search_preview","web_search_preview_2025_03_11","web_search","web_search_2025_08_26"],"path":["tools",5,"type"],"message":"Invalid discriminator value.
Expected 'function' | 'web_search_preview' | 'web_search_preview_2025_03_11' | 'web_search' | 'web_search_2025_08_26'"}],"name":"ZodError"}}
Closing old issue.