What this error means

Authentication failed. Run claude auth login to authenticate. / Error: 401 - {"error":{"type":"authentication_error","message":"invalid x-api-key"}} is a Claude Code failure pattern reported for developers trying to claude code 用户遇到认证失败（oauth token 过期或 api key 无效），需要在本地开发环境或无头服务器上重新配置身份验证以恢复编码能力。. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

source: https://markaicode.com/errors/claude-code-authentication-failed-fix/ — 覆盖了 claude auth login OAuth 流程、ANTHROPIC_API_KEY 环境变量设置、headless 模式、service account 等多种场景。covered-errors.md 仅覆盖 Cursor/OpenAI key 相关条目，未覆盖 Claude Code 自身认证体系。Commercial value 高：Claude Code Pro 订阅工具，auth 故障直接影响付费用户生产力。Category 按规则映射为 AI Coding Tools。

Common causes

  • source: https://markaicode.com/errors/claude-code-authentication-failed-fix/ — 覆盖了 claude auth login OAuth 流程、ANTHROPIC_API_KEY 环境变量设置、headless 模式、service account 等多种场景。covered-errors.md 仅覆盖 Cursor/OpenAI key 相关条目，未覆盖 Claude Code 自身认证体系。Commercial value 高：Claude Code Pro 订阅工具，auth 故障直接影响付费用户生产力。Category 按规则映射为 AI Coding Tools。

Quick fixes

  1. Confirm the exact error signature matches Authentication failed. Run claude auth login to authenticate. / Error: 401 - {"error":{"type":"authentication_error","message":"invalid x-api-key"}}.
  2. Check the Claude Code account, local tool state, and provider configuration involved in the failing workflow.
  3. Verify the account session, API key, provider settings, and environment where the failing tool is running.

Platform/tool-specific checks

  • Verify the command, editor, extension, or API client that produced the error.
  • Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
  • Avoid deleting credentials, local model data, or project settings until the failing scope is clear.

Step-by-step troubleshooting

  1. Capture the exact error message and the command, editor action, or request that triggered it.
  2. Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
  3. Review the source evidence below and compare it with your environment.
  4. Apply one change at a time and rerun the smallest failing action.
  5. Keep the working fix documented for the team or deployment environment.

How to prevent it

  • Keep provider/tool configuration documented.
  • Record non-secret diagnostics such as tool version, provider name, model name, and command path.
  • Add a lightweight check before CI or production workflows depend on the tool.