neuradex 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
npx tsx scripts/langfuse-trace-view.ts <traceId>
2. JSON Output
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.) |