# Log Trace — Langfuse

> Log a new trace in LangFuse with details. See the documentation.

- Key: `langfuse-log-trace`
- Type: Action (Write)
- Version: 0.0.3
- App: Langfuse (`langfuse`) — https://pipedream.com/apps/langfuse.md
- This page (HTML): https://pipedream.com/apps/langfuse/actions/log-trace
- Hints: open-world
- Source: https://github.com/PipedreamHQ/pipedream/blob/master/components/langfuse/actions/log-trace/log-trace.mjs

## Description

Log a new trace in LangFuse with details. [See the documentation](https://api.reference.langfuse.com/#tag/ingestion/POST/api/public/ingestion).

## Props

| Prop | Type | Required | Description |
|---|---|---|---|
| `name` | `string` | Yes | The name of the trace |
| `input` | `string` | Yes | The input of the trace |
| `output` | `string` | Yes | The output of the trace |
| `userId` | `string` | No | The ID of the user |
| `sessionId` | `string` | No | The ID of the session Options are loaded from the connected account. |
| `release` | `string` | No | The release of the trace |
| `version` | `string` | No | The version of the trace |
| `metadata` | `string` | No | The metadata of the trace |
| `tags` | `string[]` | No | The tags of the trace |

## Run it

**MCP**

```ts
import { Client } from "@modelcontextprotocol/sdk/client/index.js"
import { StreamableHTTPClientTransport } from "@modelcontextprotocol/sdk/client/streamableHttp.js"
import { PipedreamClient } from "@pipedream/sdk"

const pd = new PipedreamClient({
  projectId: process.env.PIPEDREAM_PROJECT_ID!,
  clientId: process.env.PIPEDREAM_CLIENT_ID!,
  clientSecret: process.env.PIPEDREAM_CLIENT_SECRET!,
  projectEnvironment: "production",
})

const accessToken = await pd.rawAccessToken

const transport = new StreamableHTTPClientTransport(
  new URL("https://remote.mcp.pipedream.net/v3"),
  {
    requestInit: {
      headers: {
        Authorization: `Bearer ${accessToken}`,
        "x-pd-project-id": process.env.PIPEDREAM_PROJECT_ID!,
        "x-pd-environment": "production",
        "x-pd-external-user-id": "{external_user_id}", // any stable ID for this user in your system
        "x-pd-app-slug": "langfuse",
      },
    },
  },
)

const mcp = new Client({ name: "my-agent", version: "1.0.0" })
await mcp.connect(transport)

const { tools } = await mcp.listTools()

// listTools() hands your model this tool's input schema, so it can
// fill the arguments itself:
const result = await mcp.callTool({
  name: "langfuse-log-trace",
  arguments: {
    name: "Name",
    input: "Input",
  },
})
```

**TypeScript**

```ts
import { PipedreamClient } from "@pipedream/sdk"

const pd = new PipedreamClient({
  projectId: process.env.PIPEDREAM_PROJECT_ID!,
  clientId: process.env.PIPEDREAM_CLIENT_ID!,
  clientSecret: process.env.PIPEDREAM_CLIENT_SECRET!,
  projectEnvironment: "production",
})

const result = await pd.actions.run({
  id: "langfuse-log-trace",
  externalUserId: "{external_user_id}", // any stable ID for this user in your system
  configuredProps: {
    langfuse: { authProvisionId: "apn_xxxxxxx" },
    name: "Name",
    input: "Input",
  },
})

console.log(result)
```

**cURL**

```bash
curl -X POST https://api.pipedream.com/v1/connect/{project_id}/actions/run \
  -H "Content-Type: application/json" \
  -H "X-PD-Environment: production" \
  -H "Authorization: Bearer {access_token}" \
  -d '{
    "external_user_id": "{external_user_id}",
    "id": "langfuse-log-trace",
    "configured_props": {
      "langfuse": { "authProvisionId": "apn_xxxxxxx" },
      "name": "Name",
      "input": "Input"
    }
  }'
```

---

- App: https://pipedream.com/apps/langfuse.md · All apps: https://pipedream.com/apps