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Automatic approval review failed: Codex automatic approval with MiMo failed

Quick fix

Use a model that supports json_schema for Codex automatic approval, or wait for CC Switch to provide a compatible fallback for MiMo.

Symptom

Section titled “Symptom”
Error output
Rejected("This action was rejected due to unacceptable risk.
Reason: Automatic approval review failed: {
  "error":{
    "message":"CC Switch local proxy failed while handling Codex endpoint /responses. Provider: MiMo; model: mimo-v2.5; upstream_status: HTTP 400; cause: data:{
      \"error\":{
        \"code\":\"responses_feature_not_supported\",
        \"message\":\"text.format type 'json_schema' is not supported, only 'text' and 'json_object' are allowed.\",
        \"param\":\"\",
        \"type\":\"unsupported_feature\"
      }
    }",
    "type":"upstream_error",
    "code":"cc_switch_upstream_error"
  }
}")

Cause

Section titled “Cause”

When Codex runs a command with `sandbox_permissions: "require_escalated"`, CC Switch forwards the automatic approval request to MiMo. The approval request uses the `json_schema` response format, but `mimo-v2.5` accepts only `text` and `json_object`, so the upstream returns HTTP 400.

Automatic approval fails before command execution, so all commands requiring elevated sandbox permissions are rejected. This issue is still open; the input contains no confirmed fixed version or fallback configuration.

Fix

Section titled “Fix”

  1. Use a model that supports the `json_schema` response format for the Codex automatic approval flow.

  2. If MiMo is required, wait for CC Switch to implement model capability detection or a simplified approval fallback when structured output is unsupported.

Affected Versions

Section titled “Affected Versions”
ToolCodex
VersionUnknown
PlatformsmacOS

Source Issues

Section titled “Source Issues”

This page is distilled from 1 real issues

FAQ

Section titled “FAQ”

(No FAQ yet)

Section titled “Related problems”
401 UnauthorizedUpgrade to cc-switch 4.0.x, or clear the stale third-party OPENAI_API_KEY from ~/.codex/auth.json manually, restart Codex, and sign in again with ChatGPT OAuth.2 issues mergedapi failed deserialize json body intoDepending on the error: roll Claude Code back, upgrade cc-switch, turn the local proxy off, or stop sending unsupported fields.8 issues mergedRequest exceeds the context windowNo verified solution was provided in the original post; this issue was closed as a duplicate related to catalog configuration and automatic compression.1 issues merged

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