feat: Add span origin provenance#2226
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## Summary Every span an integration creates now carries a stable identifier in `context.span_origin.instrumentation.name` — `openai-auto`, `anthropic-auto`, `temporal-auto`, and so on — matching the naming convention in the Braintrust instrumentation spec's `span_origin` example. Previously all integration spans were tagged with the shared `braintrust-python-logger` default, which made per-integration filtering on `span_origin` impossible. Builds on #570 (which added the `span_origin` scaffolding). ## API surface `start_span` (and every provider-level `start_span` method) gains an `internal: dict | None = None` kwarg reserved for Braintrust SDK internals. Integrations pass `internal={"instrumentation": "<provider>-auto"}` to stamp the span origin; the `internal` name signals to external callers that they shouldn't touch it and its keys can change without notice. ```python from braintrust import start_span with start_span(name="my-op", internal={"instrumentation": "my-integration-auto"}) as span: ... ``` - Threaded through every span-creation surface: top-level `start_span`, `Span.start_span`, `SpanImpl.start_span`, `Experiment.start_span`, `Dataset.start_span`, `Logger.start_span`, and `_NoopSpan.start_span`. - When set, `SpanImpl` reads `internal["instrumentation"]` and stamps it into `context.span_origin.instrumentation.name` via `merge_span_origin_context`. - When unset, spans fall back to the channel default — `braintrust-python-logger` for direct logging, `braintrust-python-otel` for the OTel processor. - **Does NOT propagate through the parent/child edge.** Each `start_span` call independently decides its own value, so a user's `@traced` scorer nested inside a wrapped provider call keeps the default identifier — the integration's name only lands on spans the integration itself opens. This matches the spec's "the module that _directly created_ the span" definition and mirrors how Sentry's `origin` and OTel's `InstrumentationScope` behave. Suggested for external Braintrust integrations authored outside this repo: ```python from braintrust.logger import start_span as _bt_start_span _INSTRUMENTATION = "my-provider-auto" def start_span(*args, **kwargs): internal = dict(kwargs.get("internal") or {}) internal.setdefault("instrumentation", _INSTRUMENTATION) kwargs["internal"] = internal return _bt_start_span(*args, **kwargs) ``` Every module-scope `start_span(...)` call then flows through the shadow with zero further edits. ## Integration migration (23 integrations) **21 shadow-based** (`adk`, `agentscope`, `agno`, `anthropic`, `autogen`, `bedrock_runtime`, `claude_agent_sdk`, `cohere`, `crewai`, `dspy`, `google_genai`, `huggingface_hub`, `instructor`, `langchain`, `litellm`, `livekit_agents`, `llamaindex`, `mistral`, `openai`, `openai_agents`, `openrouter`, `pydantic_ai`) — the shadow above at the top of each `tracing.py`/`callbacks.py`. **Explicit at call sites** (2 integrations): - `temporal/plugin.py`: `internal={"instrumentation": "temporal-auto"}` at each `logger.start_span(...)` site — Logger method calls don't go through the module-level shadow. - `openai_agents/tracing.py`: `internal={"instrumentation": _INSTRUMENTATION}` on the three `current_context.start_span(...)` / `self._logger.start_span(...)` / `parent.start_span(...)` sites. ## Tests - `py/src/braintrust/test_otel.py` — new tests covering `merge_span_origin_context` resolution and an end-to-end `SpanImpl` assertion that child spans do NOT inherit the parent's instrumentation name (child falls back to `braintrust-python-logger`). - Per-integration inline assertion: each of the 23 integrations' existing VCR tests now asserts `span["context"]["span_origin"]["instrumentation"]["name"] == "<provider>-auto"` in place, next to the real provider-facing coverage. If a shadow ever regresses, that specific integration's test suite fails with a clear signal. ## Docs - `.agents/skills/sdk-integrations/SKILL.md` gains a **Span origin** section documenting the shadow pattern, the no-inheritance rule, and the `<provider>-auto` naming convention. - Same file relaxes the earlier strict "metadata MUST NOT capture anything outside the spec" guidance to an allowlist-per-provider model — spec-defined keys must be captured, provider-specific detail fields can be included deliberately, no dumping raw request/response objects. - Spec reference now links to the actual URL (https://github.com/braintrustdata/braintrust-spec/blob/main/docs/instrumentation-guide.md). ## Validation - `nox -s test_core`: **647 passed, 66 skipped, 12 xfailed** - `nox -s test_types`: **16 passed** (pyright + mypy clean) - `nox -s pylint`: successful (also ran ruff format + ruff check --fix as part of pre-commit) - **30 provider `(latest)` sessions** — every one whose Python 3.14 wheels are available. Zero failures. `test_livekit_agents` and `test_crewai` skipped due to pre-existing Python 3.14 wheel gaps in `onnxruntime` / `pydantic-core`, unrelated to this change. ## Follow-ups - JS SDK's mirror PR (braintrustdata/braintrust-sdk-javascript#2226) is still open with only `braintrust-js-logger` / `braintrust-otel-js` hardcoded and no per-integration wiring. Aligning JS on the same `<provider>-auto` names is worth doing before this ships so cross-SDK dashboards work — the spec only gives `openai-auto` as an illustrative example, so a coordinated commit-to-a-convention is needed on both sides. - Naming convention isn't currently prescribed by the spec (`docs/instrumentation-guide.md` just shows `openai-auto` in a JSON blob). Worth a spec PR to make it normative once JS and Python agree. <!-- sfk:created-approved-by --> Created by abhijeet <!-- sfk:slack-thread --> [Slack thread](https://starfolkai.slack.com/archives/C0AQDETAVT3/p1784153314321549?thread_ts=1784153314.321549&cid=C0AQDETAVT3) --------- Co-authored-by: Starfolk <noreply@starfolk.ai>
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Summary
Adds span origin provenance to the TypeScript SDK direct logging and OpenTelemetry paths, including .env.braintrust environment detection.
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