Feature Request: Add Langfuse Tracing

Summary

Add tracing/observability to OpenCode using Langfuse.

Why

Currently no way to trace execution or monitor performance
Difficult to debug issues in production
Missing insights on usage patterns and bottlenecks

Proposal

Integrate Langfuse (https://langfuse.com/) for tracing, which is already supported by Goose (https://block.github.io/goose/) per their documentation.

Benefits

Simple debugging
Performance monitoring
Usage analytics
Low implementation effort

langfuse supports Otel, so preferably we could instrument with Otel and have langfuse as one of N many different OtelProcessors

https://langfuse.com/docs/opentelemetry/get-started

👍🏼 to this. Would love to be able to opt-in to emitting native instrumentation for as much of the stack as possible simply by adding the OTEL exporter env vars + leveraging the GenAI semantic conventions I'd be happy to assist on this as well.

+1 to having tracing/observability, especially with the release of the SDK

Following #4978, Langfuse tracing is now possible with a minimal plugin that can look something like

/**
 * Langfuse OpenTelemetry Plugin for OpenCode
 * 
 * Requires: bun add @langfuse/otel @opentelemetry/sdk-node
 * Env vars: LANGFUSE_PUBLIC_KEY, LANGFUSE_SECRET_KEY, LANGFUSE_HOST
 */
import { NodeSDK } from "@opentelemetry/sdk-node"
import { LangfuseSpanProcessor } from "@langfuse/otel"

let initialized = false

export const LangfusePlugin = async () => ({
  async config(config) {
    if (!config.open_telemetry || initialized) return
    initialized = true

    const processor = new LangfuseSpanProcessor()
    new NodeSDK({ spanProcessors: [processor] }).start()

    // // Flush frequently - Required in headless mode to make sure flushes are made before process exit
    // setInterval(() => processor.forceFlush(), 500)
  },
})

(Probably worth finding a better solution for headless mode)

Following #4978, Langfuse tracing is now possible with a minimal plugin that can look something like

/**
 * Langfuse OpenTelemetry Plugin for OpenCode
 * 
 * Requires: bun add @langfuse/otel @opentelemetry/sdk-node
 * Env vars: LANGFUSE_PUBLIC_KEY, LANGFUSE_SECRET_KEY, LANGFUSE_HOST
 */
import { NodeSDK } from "@opentelemetry/sdk-node"
import { LangfuseSpanProcessor } from "@langfuse/otel"

let initialized = false

export const LangfusePlugin = async () => ({
  async config(config) {
    if (!config.open_telemetry || initialized) return
    initialized = true

    const processor = new LangfuseSpanProcessor()
    new NodeSDK({ spanProcessors: [processor] }).start()

    // // Flush frequently - Required in headless mode to make sure flushes are made before process exit
    // setInterval(() => processor.forceFlush(), 500)
  },
})

(Probably worth finding a better solution for headless mode)

Is it possible to record telemetry on a per user level with this plugin? if not how to trace user level tracing in langfuse

Merge pull request anomalyco#219 from Latitudes-Dev/shuvcode-dev

https://github.com/omercnet/opencode-plugin-langfuse

@omercnet

@omercnet Do you know what opentelemetry metrics does opencode emits? I couldn't find any telemetry metrics and logs even I configure

{
  "experimental": {
    "openTelemetry": true
  },
  "plugin": ["opencode-plugin-langfuse"]
}

@pai4451

@pai4451 make sure you set env vars properly, try in terminal first with opencode --print-logs --log-level WARN run test to see any warning logs

and kindly open issues on the plugin repo so we can handle any bugs

I tested with Langfuse, and the main core gap seems to be handling incoming traceparent headers on the server side.

Merge pull request anomalyco#219 from shimo4228/feat/skills/cost-awar…

feat: add minimal run status line (anomalyco#219)

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Feature Request: Add Langfuse Tracing #219

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Feature Request: Add Langfuse Tracing #219

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ColeMurray commented on Jun 21, 2025

adrielp commented on Jul 17, 2025

mattzhango commented on Sep 7, 2025

noamzbr commented on Dec 5, 2025

modelnova-ai commented on Dec 6, 2025

omercnet commented on Jan 11, 2026

pai4451 commented on Jan 13, 2026

omercnet commented on Jan 13, 2026

Betula-L commented on Mar 23, 2026

github-actions commented on May 23, 2026

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