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Query Langfuse traces for debugging LLM calls, analyzing token usage, and investigating workflow executions. Use when debugging AI/LLM behavior, checking trace data, or analyzing observability metrics.
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| name | langfuse-traces |
| description | Query Langfuse traces for debugging LLM calls, analyzing token usage, and investigating workflow executions. Use when debugging AI/LLM behavior, checking trace data, or analyzing observability metrics. |
| allowed-tools | Bash, Read |
Query and analyze Langfuse trace data directly from Claude Code.
Invoke the query script using the base directory shown above:
bash <base_directory>/scripts/query.sh <command> [options]
| Command | Args | Description |
|---|---|---|
traces | [limit] [session_id] [name] | List recent traces |
trace | trace_id | Get full trace with observations |
observations | [limit] [trace_id] | List spans/generations |
sessions | [limit] | List sessions |
summary | [limit] | Compact one-line-per-trace view |
# List last 20 traces
bash <base_directory>/scripts/query.sh traces 20
# Get specific trace detail
bash <base_directory>/scripts/query.sh trace tr-abc123
# List observations for a trace
bash <base_directory>/scripts/query.sh observations 50 tr-abc123
# Quick summary of recent activity
bash <base_directory>/scripts/query.sh summary 10
The script reads credentials from .env.local, .env, or environment variables:
LANGFUSE_PUBLIC_KEY=pk-lf-...
LANGFUSE_SECRET_KEY=sk-lf-...
LANGFUSE_BASE_URL=https://cloud.langfuse.com # optional, default
curl (standard on macOS/Linux)jq for JSON parsingAll commands return JSON (piped through jq). Use jq filters for specific fields:
bash <base_directory>/scripts/query.sh traces 5 | jq '.data[].name'