Body discarded: Anthropic protocol conversion Claude Code

Quick fix

Upgrade to v3.20.3 or a v4 version containing the fix; the converter ignores trailing empty reasoning_content.

Symptom

Error outputCopy

index:0 thinking → index:1 text → index:2 thinking(空)

English translation

index:0 thinking → index:1 text → index:2 thinking (empty)

Cause

During Anthropic protocol conversion, when the upstream sends empty reasoning_content after a text block, the converter incorrectly opens a new thinking block, creating an invalid thinking → text → thinking order; Claude Code therefore discards the entire body. The maintainer confirmed that v3.20.3 fixed this issue and that all v4 versions include the fix.

Fix

1. 1

   Upgrade cc-switch to v3.20.3 or a v4 version containing the fix; the version link provided by the maintainer is v4.0.6.

Affected Versions

ToolClaude Code

Version3.20.0（修复版本：v3.20.3；v4 各版本包含修复）

PlatformsWindows

Source Issues

This page is distilled from 1 real issues

• #6903Anthropic 协议转换丢正文，表现为终端对话输出内容持续换行输出

FAQ

Which version fixes this issue?

The maintainer said v3.20.3 fixes it, all v4 versions include the fix, and recommended upgrading to the latest version.

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 mergedThe `content[].thinking` in thinking modeSome variants remain unresolved: upgrade to a version with the thinking history normalization fix; for Codex routed through DeepSeek, use a version with the…13 issues mergedSessions may stop responding (JSONL stops being written) — Claude CodeUpdate CC Switch to the latest 4.0 release and retry. If it still hangs, temporarily bypass CC Switch and submit complete reproduction details.1 issues merged