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unsupported call: — Codex tool call failed

Quick fix

No confirmed fix yet; CC Switch must preserve function_call name and call_id in streaming events.

Symptom

Section titled “Symptom”
Error output
function_call_output: "unsupported call: "

Cause

Section titled “Cause”

When sending a streaming /v1/responses request with tools to Xiaomi MiMo through the CC Switch local proxy, function_call.call_id and name are correct in the response.output_item.added event, but both become empty strings in subsequent response.output_item.done and response.completed events. Codex assembles tool calls from done/completed events, so it rejects these calls.

This issue was reported on CC Switch 3.20.4 on Windows 11. The same request has complete fields with stream: false, indicating the field loss occurs in the streaming SSE aggregation path. This issue remains open and has no confirmed fix.

Fix

Section titled “Fix”

  1. Report the issue to CC Switch maintainers and provide a streaming SSE capture. The report recommends reusing the call_id and name captured from response.output_item.added when generating output_item.done and response.completed.

  2. If the caller can control the request mode, verify whether stream: false avoids the issue; however, the report notes that real Codex uses streaming requests.

Affected Versions

Section titled “Affected Versions”
ToolCodex
Version3.20.4（受影响报告版本）
PlatformsWindows

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”
<thinking> tags output as body text in Claude CodeChanging the provider's apiFormat from openai_chat to anthropic, if supported upstream, can bypass inline <thinking> leakage.1 issues mergedSelect Model Menu Still Shows Pre-Switch Model List - CodexClose existing Codex sessions, run `codex app-server daemon restart`, and upgrade CC Switch to v4.0.7 or later for detection and restart prompts.3 issues mergedProxy not working, constant reconnect after entering a question; CodexThe separate proxy feature in cc-switch was removed; set the proxy via $env:http_proxy in PowerShell, then run Codex.1 issues merged

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