Filter Observations by Tool Calls and add Tool Calls to Dashboard Widgets

Add filtering, table columns, and dashboard widgets for analyzing tool usage in your LLM applications. Tool calls are now a distinct data structure in Langfuse, allowing you to filter observations by available and called tools and build dashboards for tool calls over time.

Tool Call Filters on the Observations Table:

• Filter by Available Tools (count of tools available to an LLM)
• Filter by Tool Calls (count of tools invoked by an LLM)
• Filter by Available Tools Names (list of specific tool names available)
• Filter by Tool Calls Names (list of specific tool names invoked)

Dashboard Widgets for Tool Calls:

• New Metrics: toolDefinitions and toolCalls with user-selectable aggregation (SUM, AVG, MAX, MIN, percentiles)
• New Filters: toolNames to break down metrics by tool name

Supported Frameworks: OpenAI, Langchain/LangGraph, Vercel AI SDK, Google ADK/Vertex AI, Microsoft Agent Framework. Pydantic AI and additional frameworks coming in future releases.

Note: This feature only works with traces ingested after this release and does not apply to historical data.