langfuse-trace-view

Original：🇺🇸 English

Translated

1 scripts

View Langfuse trace details. Use when checking specific trace input/output, debugging LLM calls, or analyzing costs.

2installs

Sourceneuradex/langfuse-skills

Added on2026-02-10

NPX Install

npx skill4agent add neuradex/langfuse-skills langfuse-trace-view

SKILL.md Content

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Langfuse Trace View

Display detailed information for a specific trace.

Setup

Set the following environment variables before use:

Variable	Required	Description
`LANGFUSE_PUBLIC_KEY`	Yes	Langfuse public key
`LANGFUSE_SECRET_KEY`	Yes	Langfuse secret key
`LANGFUSE_HOST` or `LANGFUSE_BASE_URL`	No	Langfuse host URL (default: `https://us.cloud.langfuse.com` )

When to Use

Checking specific trace details
Viewing LLM input/output
"Show me the details of this trace"
Investigating by trace ID

Commands

1. Get Trace Details

bash

npx tsx scripts/langfuse-trace-view.ts <traceId>

2. JSON Output

bash

npx tsx scripts/langfuse-trace-view.ts <traceId> --json

Output Example

Langfuse Trace Detail
=====================

ID:        abc123-def456-ghi789
Name:      librarian/chat
Timestamp: 2025-01-15 10:30:45
User ID:   user-123
Session:   lb:session-456
Latency:   1234ms
Cost:      $0.0150
Tags:      env:production

Metadata:
{
  "projectId": "project-123",
  "organizationId": "org-456"
}

Input:
{
  "userMessage": "Search the knowledge base"
}

Output:
{
  "response": "Here are the search results..."
}

Observations (3):
--------------------------------------------------------------------------------

[GENERATION] llm-call
  Time: 10:30:46  Model: gpt-4o  Cost: $0.0120  Tokens: in:150 out:200
  Input: {"role": "user", ...}
  Output: Here are the search results...

[SPAN] tool-execution
  Time: 10:30:47  Model: -  Cost: -  Tokens: -

Fields

Field	Description
ID	Trace ID
Name	Trace name
Timestamp	Creation timestamp
User ID	User ID
Session	Session ID
Latency	Processing time (ms)
Cost	Estimated cost
Tags	Tag list
Metadata	Metadata
Input	Trace input
Output	Trace output
Observations	Child spans (Generation, Span, etc.)