# Langfuse — Pipedream Connect

> Open source LLM engineering platform. Traces, evals, prompt management and metrics to debug and improve your LLM application.

- API slug: `langfuse` (use in MCP headers and tool keys)
- Auth: API key (Pipedream-managed)
- Categories: Artificial Intelligence (AI)
- Website: https://langfuse.com/
- This page (HTML): https://pipedream.com/apps/langfuse
- Tools: 7 actions · 2 triggers

## Connect via MCP (recommended)

- Endpoint: `https://remote.mcp.pipedream.net/v3`
- Headers: `Authorization: Bearer <token>` · `x-pd-project-id` · `x-pd-environment` · `x-pd-external-user-id` · `x-pd-app-slug: langfuse`

```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()

// e.g. run Add Feedback:
const result = await mcp.callTool({
  name: "langfuse-add-feedback",
  arguments: {
    projectId: "Trace ID",
    objectType: "Object Type",
  },
})
```

Docs: [MCP guide](https://pipedream.com/docs/connect/mcp/developers.md)

## API proxy

For a Langfuse endpoint with no pre-built tool, the proxy forwards your request with the connected user's credentials attached.

```bash
# The path segment is the target URL, URL-safe base64 encoded:
# https://api.example.com/v1/me

curl "https://api.pipedream.com/v1/connect/{project_id}/proxy/aHR0cHM6Ly9hcGkuZXhhbXBsZS5jb20vdjEvbWU?external_user_id={external_user_id}&account_id=apn_xxxxxxx" \
  -H "Authorization: Bearer {access_token}" \
  -H "x-pd-environment: production"
```

Docs: [API proxy guide](https://pipedream.com/docs/connect/api-proxy.md)

## SDK

```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-add-feedback",
  externalUserId: "{external_user_id}", // any stable ID for this user in your system
  configuredProps: {
    langfuse: { authProvisionId: "apn_xxxxxxx" },
    projectId: "Trace ID",
    objectType: "Object Type",
  },
})
```

Docs: [Managed auth guide](https://pipedream.com/docs/connect/managed-auth/quickstart.md) · [Tools guide](https://pipedream.com/docs/connect/components.md)

## Actions (7)

### `langfuse-add-feedback` — Add Feedback (Write)

Attach user feedback to an existing trace in Langfuse. See the documentation.

Full schema: https://pipedream.com/apps/langfuse/actions/add-feedback.md

### `langfuse-get-trace-by-id` — Get Trace by ID (Read-only)

Retrieve a trace from Langfuse by its ID. See the documentation.

Full schema: https://pipedream.com/apps/langfuse/actions/get-trace-by-id.md

### `langfuse-list-observations` — List Observations (Read-only)

Retrieve a paginated list of observations from Langfuse with optional filters. See the documentation.

Full schema: https://pipedream.com/apps/langfuse/actions/list-observations.md

### `langfuse-list-project-id-options` — List Project ID Options (Read-only)

Retrieves available options for the Project ID field.

Full schema: https://pipedream.com/apps/langfuse/actions/list-project-id-options.md

### `langfuse-list-scores` — List Scores (Read-only)

Retrieve a paginated list of scores from Langfuse with optional filters. See the documentation.

Full schema: https://pipedream.com/apps/langfuse/actions/list-scores.md

### `langfuse-list-sessions` — List Sessions (Read-only)

Retrieve a paginated list of sessions from Langfuse with optional filters. See the documentation.

Full schema: https://pipedream.com/apps/langfuse/actions/list-sessions.md

### `langfuse-log-trace` — Log Trace (Write)

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

Full schema: https://pipedream.com/apps/langfuse/actions/log-trace.md

## Triggers (2)

### `langfuse-new-score-received` — New Score Received (Polling)

Emit new event when user feedback (score) is submitted on a trace in Langfuse. See the documentation.

Full schema: https://pipedream.com/apps/langfuse/triggers/new-score-received.md

### `langfuse-new-trace-received` — New Trace Received (Polling)

Emit new event when a new trace is recorded in Langfuse. See the documentation.

Full schema: https://pipedream.com/apps/langfuse/triggers/new-trace-received.md

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- All apps: https://pipedream.com/apps — index: https://pipedream.com/llms.txt
- Pipedream docs for agents: https://pipedream.com/docs/llms.txt