What this error means

Claude Code: sdk_stream_ended_no_result had_error: true is a Claude Code failure pattern reported for developers trying to fix claude code streaming stalls and no result after update. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

v2.1.141 regression. Slow first byte (~30s), streaming stall (~50s gap), sdk_stream_ended_no_result with had_error: true. Fast mode unavailable logged 4 times per request. Rolling back to v2.1.140 fixes immediately.

Common causes

  • After Claude Code auto-updated to v2.1.141, all prompts fail with streaming stalls (50s+ gaps) followed by sdk_stream_ended_no_result. Rolling back to v2.1.140 resolves immediately. Affects all prompts, not just long sessions.
  • v2.1.141 regression. Slow first byte (~30s), streaming stall (~50s gap), sdk_stream_ended_no_result with had_error: true. Fast mode unavailable logged 4 times per request. Rolling back to v2.1.140 fixes immediately.

Quick fixes

  1. Confirm the exact error signature matches Claude Code: sdk_stream_ended_no_result had_error: true.
  2. Check the Claude Code account, local tool state, and provider configuration involved in the failing workflow.
  3. Compare the failing environment with a known working setup, then change one configuration value at a time.

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.