# `Impact.Trace`

Manual span helper. Emits the canonical Impact trace attributes:

  * `impact.trace.type`
  * `impact.trace.name`
  * `impact.trace.path` — dot-separated stack of nested manual spans
  * `impact.trace.input` — best-effort JSON of inputs (when `capture_content: true`)
  * `impact.trace.output` — best-effort JSON of outputs (when `capture_content: true`)

Context attributes from `Impact.Context` are merged in automatically.

# `with_span`

```elixir
@spec with_span(
  keyword(),
  (-> any())
) :: any()
```

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*Consult [api-reference.md](api-reference.md) for complete listing*