How do I fix a 401 Unauthorized error in Langfuse?

Verify that your LANGFUSE_PUBLIC_KEY and LANGFUSE_SECRET_KEY are correctly set and that the LANGFUSE_HOST matches your instance (Cloud vs. Self-hosted).

What should I do if my traces stay 'in progress' forever?

This happens when a span or generation is never closed. The skill provides patterns to ensure .end() is always called within try/finally blocks.

Why are my Langfuse traces not appearing in the dashboard?

This is often because the data wasn't flushed before the process exited. Use the skill to implement langfuse.flushAsync() or langfuse.shutdownAsync() in your shutdown handlers.

Why is token usage showing as zero in my generations?

Usage data might not be captured automatically from LLM providers. For OpenAI streaming, you must enable include_usage in stream_options, or manually pass the usage object to the generation.end() call.

Langfuse Error Troubleshooting

Name: Langfuse Error Troubleshooting
Author: jeremylongshore

byjeremylongshore

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1,538

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Analytics & Monitoring

Diagnoses and resolves common Langfuse errors, connectivity issues, and observability gaps to ensure reliable LLM tracing.

This skill provides a comprehensive diagnostic framework for Langfuse integrations, addressing the most frequent challenges encountered by developers during LLM observability setup. It offers step-by-step solutions for authentication failures, missing trace data, network timeouts, and SDK version mismatches. Whether you are dealing with 401 Unauthorized errors, traces not appearing in the dashboard, or missing token usage data, this skill helps you quickly identify the root cause and apply the correct fix to maintain robust monitoring for your AI applications.

Key Features

01Diagnostic logic for the top 10 most common Langfuse errors

02Code patterns for proper trace flushing and process shutdown

03Quick-access CLI commands for API health and auth testing

04Automated environment variable and connectivity verification

05Troubleshooting support for both Cloud and self-hosted instances

061,538 GitHub stars

Use Cases

01Resolving authentication and 401 errors during initial setup

02Fixing missing token usage metrics in LLM generation logs

03Debugging missing traces or spans in the Langfuse dashboard

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add jeremylongshore/claude-code-plugins-plus-skills langfuse-common-errors

For use in Claude.ai and ChatGPT

Download Skill

Key Features

01Diagnostic logic for the top 10 most common Langfuse errors

02Code patterns for proper trace flushing and process shutdown

03Quick-access CLI commands for API health and auth testing

04Automated environment variable and connectivity verification

05Troubleshooting support for both Cloud and self-hosted instances

061,538 GitHub stars

Use Cases

01Resolving authentication and 401 errors during initial setup

02Fixing missing token usage metrics in LLM generation logs

03Debugging missing traces or spans in the Langfuse dashboard

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add jeremylongshore/claude-code-plugins-plus-skills langfuse-common-errors

For use in Claude.ai and ChatGPT

Download Skill