fix: we were missing content from langfuse traces

[michaelneale]

fixes ##7121

seems to bring the content back, if we still want langfuse that is cc @blackgirlbytes @DOsinga

[Copilot]

Pull request overview

Fixes missing Langfuse trace content by propagating user/assistant text into Langfuse trace-level input/output and improving Langfuse base URL env var compatibility.

Changes:

• Add trace-level update support in ObservationLayer and filter trace_input/trace_output out of span updates.
• Record tool-call input and trace input/output from the agent via tracing fields/events.
• Expand Langfuse base URL env var lookup to include LANGFUSE_BASE_URL and LANGFUSE_HOST.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
crates/goose/src/tracing/observation_layer.rs	Adds trace update path for input/output and tests covering trace-only and mixed metadata behavior.
crates/goose/src/tracing/langfuse_layer.rs	Accepts additional env vars for Langfuse base URL configuration.
crates/goose/src/agents/agent.rs	Instruments tool dispatch and reply flow to emit trace input/output content.

[Copilot]

json!({"tool": tool_call.name, "arguments": tool_call.arguments}) moves fields out of tool_call, so subsequent uses of tool_call.name / tool_call.arguments in this function will not compile; serialize references (e.g., &tool_call.name / &tool_call.arguments) or clone the fields before building input_summary.

Suggested change

	"tool": tool_call.name,
	"arguments": tool_call.arguments,
	"tool": &tool_call.name,
	"arguments": &tool_call.arguments,

[Copilot]

body[k] = v is indexing a serde_json::Value with a String, which doesn’t type-check; use body[&k] = v or mutate the underlying object via as_object_mut() and insert.

Suggested change

	for (k, v) in updates {
	body[k] = v;
	if let Some(map) = body.as_object_mut() {
	for (k, v) in updates {
	map.insert(k, v);
	}

[codefromthecrypt]

thanks, shortly I'll do another pass on otel cleanups since have a conference soon to show off goose at!