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failed to parse function arguments: EOF while parsing an object — Codex

Quick fix

No verified fix is available. Check Codex session logs for truncated arguments JSON, then report it to the upstream provider or switch providers.

Symptom

Section titled “Symptom”
Error output
failed to parse function arguments: EOF while parsing an object at line 1 column 1135

Cause

Section titled “Cause”

In Issue #5001, MiniMax-M3 stopped while streaming `response.function_call_arguments.delta`, without outputting the closing `}` or `response.function_call_arguments.done`. As a result, Codex failed when parsing incomplete `arguments` JSON locally. The report considers this unrelated to CC Switch's 2 KB buffer or proxy serialization-layer truncation.

A follow-up in the same discussion reported another `/responses` tool-call variant: the upstream returned `messages.2.tool_call_id 长度不足`. That report used a different upstream and model, and its root cause has not been confirmed. Both variants appear as an HTTP 400 error from CC Switch, but the original post says the error does not clearly distinguish upstream validation failure from incomplete tool arguments received by the client. The issue remains open and provides no verified fix.

Fix

Section titled “Fix”

  1. The original post provides no verified solution. Check Codex session logs for `failed to parse function arguments`, and confirm whether the tool-argument JSON is missing closing characters.

  2. Report the truncated tool-call record to the upstream provider, or switch to another provider. This is the root-cause direction proposed by the original post and was not confirmed as successful in this issue.

Affected Versions

Section titled “Affected Versions”
ToolCodex
Version3.16.5 - 3.20.1（报告版本，非已确认影响范围）
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”
Invalid type for 'messages'Upgrade cc-switch to the latest version for the conversion fix, or downgrade the Codex CLI to 0.80.0 and use wire_api="chat" to work around it.4 issues mergedProvider API Key Overwritten: After Codex Restart or SwitchUpgrade to cc-switch v4.0.0 or later to prevent provider keys from overwriting each other and restore the official login state.6 issues mergedauto mode cannot determine the safety: Claude Code errorUpgrade CC Switch first. If the error persists, check thinking parameters, model mapping, stop support, and the response format when stream is omitted.6 issues merged

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