Skip to main content
Re-exported from fiddler_otel.decorators.trace.
Decorator for automatic function tracing with input/output capture. Uses the global FiddlerClient when client= is not passed. Supports both sync and async functions.

​
Parameters

​
func
Callable | None
default:"None"
Function to decorate.
​
name
str | None
default:"None"
Custom span name (defaults to the function name).
​
as_type
Literal['span', 'generation', 'chain', 'tool']
default:"'span'"
Span type — "span", "generation", "chain", or "tool".
​
capture_input
bool
default:"True"
Capture function arguments as span input.
​
capture_output
bool
default:"True"
Capture the return value as span output.
​
client
FiddlerClient | None
default:"get_client()"
FiddlerClient instance (defaults to get_client()).
​
model
str | None
default:"None"
LLM model name; sets gen_ai.request.model.
​
user_id
str | None
default:"None"
User identifier; sets user.id.
​
version
str | None
default:"None"
Version string; sets service.version.
​
system
str | None
default:"None"
LLM provider; sets gen_ai.system.

​
Returns

The decorated function.
See the canonical reference for the full description and examples.