> ## Documentation Index
> Fetch the complete documentation index at: https://langwatch.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Tracking Tool Calls

> Track tool calls in TypeScript/JavaScript agent applications with LangWatch to improve debugging and evaluation completeness.

<Note>
  Most agent frameworks automatically track tool calls for you. If you're using [LangChain, LangGraph, Mastra, or other supported frameworks](/integration/overview#frameworks), tool calls are already being captured automatically. You only need manual instrumentation for custom tools or unsupported frameworks.
</Note>

## Manual Tool Tracking

If you have custom tools that aren't automatically tracked, you can manually instrument them by setting the span type to `"tool"`:

```typescript theme={null}
import { setupObservability } from "langwatch/observability/node";
import { getLangWatchTracer } from "langwatch";

setupObservability();

const tracer = getLangWatchTracer("agent-service");

const agentCall = async (query: string): Promise<string> => {
  return await tracer.withActiveSpan("AgentCall", async (span) => {
    // Your agent logic here
    const result = await myCustomTool(query);
    return result;
  });
};

const myCustomTool = async (query: string): Promise<string> => {
  return await tracer.withActiveSpan("MyCustomTool", async (span) => {
    span.setType("tool");

    // Your custom tool implementation
    const result = `Tool result for: ${query}`;
    return result;
  });
};

await agentCall("What's the weather?");
```

This will display the tool call with a tool icon in the trace visualization and include it in tool call analytics in the LangWatch dashboard.