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<tool_use_error>InputValidationError - Claude Code

Quick fix

An SSE parsing bug in the cc-switch conversion layer loses tool calls. Connect to the API directly, or switch to an official node, for now.

Symptom

Section titled “Symptom”
Error output
<tool_use_error>InputValidationError: Bash failed due to the following issue: The required parameter command is missing</tool_use_error>

Cause

Section titled “Cause”

When calling a third-party OpenAI-compatible API such as DeepSeek through the cc-switch proxy, the cc-switch conversion layer has a bug handling tool calls (tool call / function_call). Specifically, an SSE parsing anomaly swallows the tool call the model should emit, or loses its parameters (the command parameter, for instance).

Claude Code or Codex then receives a malformed tool response, triggering InputValidationError and interrupting the task. In some cases the interrupted stream wedges the cc-switch internal state, which keeps showing "login in use" and will not switch. Officially this was declared fixed in 3.19.2, but users report the problem persisting, and there is no clean fix yet.

Fix

Section titled “Fix”

  1. Bypass the cc-switch proxy and configure the third-party API baseurl and key directly in Claude Code or Codex.

  2. If you must use cc-switch, try switching to an API node that does not exhibit this SSE parsing problem, such as official GLM.

  3. If cc-switch is stuck showing "in use" and will not close, try force-killing the Codex process and clearing the persisted state under ~/.codex/. Users report this may not help, in which case bypassing the proxy or waiting for an official fix remains the answer.

Affected Versions

Section titled “Affected Versions”
ToolClaude Code / Codex
Version3.16.1 - 3.19.2
PlatformsLinuxWindowsmacOS

Source Issues

Section titled “Source Issues”

This page is distilled from 3 real issues

FAQ

Section titled “FAQ”
Is it fixed in 3.16.4 or 3.19.2?
Not entirely. 3.19.2 was declared to resolve it, but users report tool calls still being interrupted in practice.
Why does only the first file edit succeed while everything after fails?
Because the conversion layer loses function_call probabilistically during a continuing conversation, so later tool calls lack parameters and fail.
The CC Switch interface keeps showing login in use and will not close. What now?
The interrupted tool call wedged the CC Switch internal state. Try force-killing the background process or restarting the machine, though the root cause still needs the conversion layer bug fixed.
Section titled “Related problems”
codex never shows the ds model - CodexCodex desktop needs an official login state to show third-party models. Enable keep-official-login-when-switching in cc-switch and restart.3 issues mergedunexpected status 401 Unauthorized CodexUse the built-in DeepSeek template instead of a hand-built config, or add http_headers to the config file by hand to pass the API Key.2 issues mergedCC Switch local proxy failed while handlingUpgrade CC Switch to the latest version and start a new Codex conversation; invalid schema or image blocks left in old session history will keep triggering 400.43 issues merged

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