Issues

• Request timeouts surface as a generic Error "timeout" instead of LangfuseAPITimeoutError on Node 20+

  bugfeat-core
  langfuse/langfuse-js#1014 · Filter by author sumeet-bansal opened on Oct 10, 2026
  1

  

• propagateAttributes({ asBaggage: true }): a nested call deletes tags inherited across a process boundary

  bugfeat-otelfeat-tracingintegration-otelsdk-js
  langfuse/langfuse-js#959 · Filter by author talarari opened on Sep 22, 2026
  

• LangfuseMedia({ source: "bytes" }) creates large transient Base64 allocations

  bugfeat-multimodalfeat-otelintegration-otelMigrated
  langfuse/langfuse-js#901 · Filter by author markwitt1 opened on Aug 5, 2026
  

• @langfuse/tracing spans are non-recording in Next.js 16 App Router route handlers (route-layer @opentelemetry/api has no provider)

  bugfeat-otelfeat-tracingintegration-otel
  langfuse/langfuse-js#878 · Filter by author don-devo opened on Jul 17, 2026
  

• handleAgentAction registers its span under the chain's runId, splitting every AgentExecutor trace in two

  bugintegration-langchainsdk-js
  langfuse/langfuse-js#867 · Filter by author Diward opened on Jul 10, 2026
  1

  

• anySignal() leaks an abort listener on the caller's AbortSignal for every request (never removed on success)

  bugsdk-js
  langfuse/langfuse-js#858 · Filter by author moko-poi opened on Jul 5, 2026
  

• @langfuse/langchain CallbackHandler doesn't forward provider-reported cost (e.g. OpenRouter usage.cost) to costDetails

  billingbugintegration-langchainsdk-js
  langfuse/langfuse-js#828 · Filter by author guillaume86 opened on Jun 12, 2026
  2

  

• CJS type mismatch when using @langfuse/langchain with TypeScript nodenext module resolution

  langfuse/langfuse-js#748 · Filter by author RingoDev opened on Mar 13, 2026
  1

  

• CallbackHandler not sending traces in LangGraph

  langfuse/langfuse-js#686 · Filter by author jigarzon opened on Nov 2, 2025
  5

  

• All Langfuse Issues are in langfuse/langfuse

  langfuse/langfuse-js#30 · Filter by author marcklingen opened on Sep 15, 2023