chore: release main

[stainless-app]

✨ Stainless prepared a new release

agentex-client: 0.19.0

0.19.0 (2026-07-14)

Full Changelog: agentex-client-v0.18.0...agentex-client-v0.19.0

Features

• tracing: emit token usage on spans for SGP billing (#458) (7d19ada)

Bug Fixes

• internal: resolve build failures (9245b70)
• tracing: capture span body exceptions and export SGP status=ERROR (#460) (6c23d76)

agentex-sdk: 0.19.0

0.19.0 (2026-07-14)

Full Changelog: agentex-sdk-v0.18.0...agentex-sdk-v0.19.0

Chores

• agentex-sdk: Synchronize agentex versions

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Greptile Summary

This is a release PR bumping both agentex-client and agentex-sdk from 0.18.0 to 0.19.0, shipping two features and a build fix: (1) token usage is now emitted on spans for SGP billing via a new TurnSpan / turn_span() helper and per-call usage injection into LiteLLM and TemporalStreamingModel spans; (2) span body exceptions are now captured and exported as SGPStatus=ERROR.

• Token usage on spans: New TurnSpan wraps rollup usage into span.data["usage"]; per-call spans get usage via span.output["usage"] from LiteLLM and the TemporalStreamingModel. A _stream_kwargs_with_usage helper enables stream_options.include_usage for litellm streaming, and concat_completion_chunks is fixed with zip_longest so usage-only final chunks (empty choices) are no longer dropped.
• Span error capture: Trace.span() / AsyncTrace.span() now call set_span_error(span, exc) on exception; _build_sgp_span reads the stored error and calls sgp_span.set_error() to propagate status=ERROR to SGP.
• Build fix: TemporalTracingModelProvider and related classes (superseded by TemporalStreamingModel) are deleted, resolving pyright build failures; scripts/lint is updated to pass -p . explicitly.

Confidence Score: 5/5

Safe to merge — all changes are well-scoped billing/observability additions with thorough test coverage and no modifications to core workflow or data-path logic.

The PR introduces token usage recording on spans and span-level error capture. Both features follow the existing reserved-key convention in span.data, are no-ops when tracing is disabled, and are covered by dedicated unit tests. The concat_completion_chunks zip_longest fix is correct and tested. The deleted TemporalTracingModelProvider was a build-failure source; its removal is clean. No auth, data mutation, or critical control-flow paths are touched.

No files require special attention — the key billing logic in TurnSpan.record_usage and the LiteLLM usage injection are each accompanied by tests that cover the happy path, the opt-out path, and the no-usage fallback.

Important Files Changed

Filename	Overview
src/agentex/lib/adk/_modules/tracing.py	Adds TurnSpan class and turn_span() context manager for recording per-turn aggregate usage in span.data for SGP billing; includes validation, warnings, and no-op behavior when tracing is disabled.
src/agentex/lib/core/services/adk/providers/litellm.py	Adds _stream_kwargs_with_usage() to enable include_usage on streaming calls; injects completion.usage into span.output for both auto-send and stream paths; fixes chunk accumulation to capture usage-only final chunks before the choices guard.
src/agentex/lib/core/tracing/span_error.py	New module with set_span_error/get_span_error helpers storing exception info under data["error"]; no-ops on list-shaped data, consistent with _add_source_to_span conventions.
src/agentex/lib/core/tracing/trace.py	Both Trace.span() and AsyncTrace.span() now catch exceptions, call set_span_error(), and re-raise; enables SGP status=ERROR export.
src/agentex/lib/core/tracing/processors/sgp_tracing_processor.py	_build_sgp_span now calls get_span_error() and forwards error_type/error_message to sgp_span.set_error(), mapping captured exceptions to SGP status=ERROR.
src/agentex/lib/utils/completions.py	concat_completion_chunks now uses zip_longest instead of zip for merging choices, preserving choices from a non-empty side when the other side is empty (e.g., usage-only final chunk with choices=[]).
src/agentex/lib/core/temporal/plugins/openai_agents/models/temporal_tracing_model.py	File deleted — TemporalTracingModelProvider and related classes removed as they were superseded by TemporalStreamingModel; resolves pyright build failures.
src/agentex/lib/core/temporal/plugins/openai_agents/models/temporal_streaming_model.py	TemporalStreamingModel now captures ResponseCompletedEvent usage and writes it to span.output["usage"]; zero-usage fallback retained for error paths where the stream ends without a completed event.

_{Reviews (3): Last reviewed commit: "chore: release main" | Re-trigger Greptile}

[stainless-app]

🤖 Release is at https://github.com/scaleapi/scale-agentex-python/releases/tag/agentex-client-v0.19.0 🌻

[stainless-app]

🤖 Release is at https://github.com/scaleapi/scale-agentex-python/releases/tag/agentex-sdk-v0.19.0 🌻