After the integration of Springai, tool calls were not displayed in Langfuse

[q878787]

Describe your question

After the integration of Springai, tool calls were not displayed in Langfuse
I saw that the data collection was successful, but the input and output were empty, and during the calling process, although toolcall was returned, the next call did not display the result of toolcall.

Langfuse Cloud or Self-Hosted?

Langfuse Cloud

If Self-Hosted

No response

If Langfuse Cloud

No response

SDK and integration versions

No response

Pre-Submission Checklist

• I have checked for existing issues/discussions and consulted Langfuse AI.

[inkeep-ai-assistant[bot]]

Based on the Spring AI integration documentation, empty input/output fields in traces are expected by default and require additional configuration(1).

To capture prompt and completion content in your Spring AI traces, you need to enable logging in your application.yml(1):

spring:
  ai:
    chat:
      observations:
        log-prompt: true
        log-completion: true

(1)

Additionally, you must add a custom span processor to include prompt and completion properties on the spans. Create a ChatModelCompletionContentObservationFilter.java file with the implementation provided in the Spring AI integration guide(1). This filter adds high cardinality key values for gen_ai.prompt and gen_ai.completion to the observation context(1).

For tool call visibility, Spring AI's internal calls should be recorded as spans with attributes like gen_ai.operation.name and gen_ai.system(1). However, if tool call inputs and outputs are still not appearing after these configurations, this may be a known limitation with OpenTelemetry attribute mapping in the Spring AI integration(1).

Make sure your sampling probability is set to capture all traces(1):

management:
  tracing:
    sampling:
      probability: 1.0

(1)

If issues persist after applying these configurations, verify that your Spring Boot Actuator and Micrometer tracing dependencies are correctly installed as specified in the integration guide(1).

📚 Sources:

1. Integrating Langfuse with Spring AI

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