Implement planned topic: 0031-langsmith-tracing

[skill-temporal-developer-updater]

Validation Report — langsmith-tracing

Scope of validation: the work introduced by branch draft/0031-langsmith-tracing:

• SKILL.md — one-line addition under "Additional Topics" pointing at the new reference (line 92).
• references/python/langsmith-tracing.md — new reference (129 lines).

Source of truth used:

• Primary docs clone — ../documentation/docs/:
  • develop/plugins-guide.mdx
  • develop/python/integrations/index.mdx
  • evaluate/development-production-features/release-stages.mdx
• Secondary (upstream Python SDK, temporalio/sdk-python, fetched at validation time):
  • temporalio/contrib/langsmith/README.md
  • temporalio/contrib/langsmith/__init__.py

The skill explicitly tags every upstream-only claim with <!-- sdk-python: ... -->, so the secondary-source dependency is declared, not implicit.

---

Go/no-go

Check	Result	Threshold	Verdict
1. Citation audit	22/22 citations resolve to substantively supporting text	≥ 98%	PASS
2. Reverse-grep audit	0 unexplained tokens	0 misses	PASS
3. Regression on known bugs	0 hits	0 hits	PASS
4. Independent re-verification	10/10 sampled claims match docs	≥ 95%	PASS

Overall verdict: GO. All four checks pass their thresholds. No findings require a re-authoring pass; no spot-fix findings.

---

Check 1 — Citation audit

Twenty-two inline <!-- ... --> source tags appear in references/python/langsmith-tracing.md. One inline <!-- VERIFY: ... --> comment (line 11) is a future-sync reminder, not a citation, and is excluded from the count.

docs/ citations (5 — all verified against the local docs clone)

#	Line in skill	Cited path	Verdict
C1	7	docs/develop/plugins-guide.mdx:20-22	✓ Cited text matches the paraphrase ("an abstraction that customizes a Temporal Worker setup, including registering Workflow and Activity definitions, modifying worker and client options, and more").
C2	7	docs/develop/plugins-guide.mdx:30	✓ Line 30 is the bullet "Observability, tracing, or logging middleware" under "common use cases for plugins".
C3	9	docs/evaluate/development-production-features/release-stages.mdx:26	✓ Row labelled "API stability" — Pre-release column reads "Experimental; API is subject to change."
C4	11	docs/develop/python/integrations/index.mdx:23-29	✓ The integrations table lists Braintrust, Google ADK, OpenAI Agents SDK, Pydantic AI, Tenuo. LangSmith is not in the table; "not yet listed" is accurate.
C5	122	docs/develop/plugins-guide.mdx:815-833	✓ Section "Context Propagators": "Context propagators pass custom key-value data … across Workflow, Activity, and Child Workflow boundaries via Temporal headers." Supports the "same header-based mechanism" claim.

sdk-python: citations (17 — verified against upstream README/__init__.py)

Verified via WebFetch against temporalio/sdk-python:main. Each tagged claim has a corresponding section/passage in the upstream README:

• Top banner — experimental release stage. ✓
• Intro — @traceable in Workflows/Activities, context propagation across workers, no duplicate traces on replay. ✓
• §Quick Start — install command uv add temporalio[langsmith]. ✓
• §Quick Start — Client.connect("localhost:7233", plugins=[LangSmithPlugin(project_name="my-project")]) example. ✓
• §API Reference (closing paragraph) — recommendation to register on both client and workers, only strictly required on the trace-producing side. ✓
• §API Reference (closing paragraph) — Client/Worker may use different add_temporal_runs settings. ✓
• §API Reference — keyword arguments and defaults (client=None, project_name=None, add_temporal_runs=False, default_metadata=None, default_tags=None). ✓
• __init__.py — LangSmithInterceptor exported from temporalio.contrib.langsmith. ✓ (file fetched; __all__ includes both LangSmithPlugin and LangSmithInterceptor).
• §"Where @traceable Works" — four-row matrix matches (Workflow methods=Yes, Activity methods=Yes, on @activity.defn=Yes with retry caveat, on @workflow.defn=No). ✓
• §"Migrating Existing LangSmith Code" + matrix — decorator order @traceable above @activity.defn. ✓
• §add_temporal_runs — default False; True adds StartWorkflow/RunWorkflow/StartActivity/RunActivity nodes. ✓
• §add_temporal_runs — StartFoo short-lived RPC vs RunFoo actual execution. ✓
• §"Replay Safety" — section exists; four bullets in the skill (no duplicate traces, deterministic IDs from random seed, workflow.now()/workflow.random() rather than datetime.now()/uuid4(), background thread pool for HTTP). ✓
• §"Example: Wrapping Retriable Steps in a Trace" — code snippet stacks @traceable around workflow.execute_activity, and the trace tree shows my_step → two Call OpenAI children (first attempt + retry) each containing openai.responses.create. Confirmed verbatim against the upstream section. ✓
• §"Context Propagation" — propagation chain Client → Workflow → Activity → Child Workflow → Nexus via Temporal headers, no manual passing. ✓

Result: 22/22 = 100% resolve cleanly. ≥ 98% threshold met.

---

Check 2 — Reverse-grep audit

Token classes extracted from the authored file and reverse-checked.

Token class	Tokens	Where verified
Python identifiers	LangSmithPlugin, LangSmithInterceptor, temporalio.contrib.langsmith	sdk-python __init__.py (both exported in __all__) and README.
Plugin kwargs	client, project_name, add_temporal_runs, default_metadata, default_tags	sdk-python README §API Reference.
Decorators (langsmith)	@traceable	sdk-python README, used throughout.
Decorators (Temporal SDK)	@activity.defn, @workflow.defn, @workflow.run, @workflow.signal	docs clone (docs/develop/python/workflows/*.mdx), confirmed via grep.
Workflow API tokens	workflow.now(), workflow.random(), workflow.execute_activity	docs clone (docs/develop/python/workflows/basics.mdx etc.), confirmed via grep.
Comparison-point tokens	datetime.now(), uuid4()	Mentioned as the non-deterministic APIs the plugin avoids — well-formed Python stdlib references; no fabrication.
Operation node labels	StartWorkflow, RunWorkflow, StartActivity, RunActivity	sdk-python README §add_temporal_runs.
Install/package tokens	temporalio[langsmith]	sdk-python README §Quick Start.
Trace-tree leaf	openai.responses.create	sdk-python README §"Example: Wrapping Retriable Steps in a Trace" (verbatim in the trace tree); also a real OpenAI Python SDK call.

Findings: 0 unexplained misses. Every factual token is grounded in either the docs clone or the upstream README it is tagged against.

---

Check 3 — Regression on known bugs

Universal pattern	Hits in authored files
--profile as a temporal flag	0
TEMPORAL_TLS_CLIENT_CERT_PATH	0
TEMPORAL_TLS_CLIENT_KEY_PATH	0
TEMPORAL_TLS_SERVER_CA_CERT_PATH	0
tcld service-account	0
--output text / --output jsonl	0
saas-api.tmprl.cloud:7233	0

No topic-specific regression patterns are documented for this skill; the universal patterns are the full set checked. The reference is purely a Python-SDK plugin doc and doesn't enter Cloud/CLI/TLS surface area, so most regressions are not applicable by topic.

Findings: 0 hits. Strict pass.

---

Check 4 — Independent re-verification (sampling)

Single reference file; 22 numbered citations; sample size = 10 (every-other selection: claims #2, #4, #7, #9, #11, #14, #16, #18, #21, #22 from §"Check 1" above). For each, re-read the cited source independently and compared against the authored claim.

Sample	Cited claim (skill)	Reading from source	Match?
#2 (line 5)	Plugin lets @traceable work in Workflows and Activities, propagates trace context across worker boundaries, prevents duplicate traces on replay	README intro: same three properties stated	✓
#4 (line 7)	Observability/tracing middleware is a use case	plugins-guide.mdx:30 — bullet "Observability, tracing, or logging middleware"	✓
#7 (line 11)	Plugin not yet listed in Python SDK integrations table	integrations/index.mdx:23-29 — table contains 5 entries, none LangSmith	✓
#9 (line 22)	Recommended on both client and workers; only strictly needed on trace-producing side	README §API Reference closing paragraph: matches	✓
#11 (line 35)	Client and Worker need not share the same plugin config (e.g. different add_temporal_runs)	README §API Reference closing paragraph: matches	✓
#14 (line 61)	Four-row "Where @traceable Works" matrix with retry/decorator-order notes	README §"Where @traceable Works": same four rows, same Yes/No values, same notes	✓
#16 (line 78)	Default False; True adds operation nodes	README §add_temporal_runs: same statement and same examples	✓
#18 (line 86)	Replay safety section intro	README §Replay Safety: section exists and contains the listed bullets	✓
#21 (line 122a)	Context propagation chain Client→Workflow→Activity→Child Workflow→Nexus via Temporal headers, no manual passing	README §Context Propagation: verbatim	✓
#22 (line 122b)	Same header-based mechanism Plugins use generally for context propagation	plugins-guide.mdx:815-833 §"Context Propagators": confirms headers as the underlying mechanism	✓

Match rate: 10/10 = 100%. ≥ 95% threshold met.

No "subtle-wrong" interpretive drift was observed. The reference paraphrases the upstream README closely without overstating or generalising.

---

Statistics

• Authored files in scope: 2 (one new reference, one one-line SKILL.md addition).
• Inline source tags in reference: 22 (5 docs/, 17 sdk-python:).
• Future-sync notes (not citations): 1 (the <!-- VERIFY: ... --> comment at line 11).
• Citations resolved: 22/22 = 100%.
• Reverse-grep token classes checked: 9; unexplained misses: 0.
• Regression patterns checked: 7 universal; hits: 0.
• Re-verification sample size: 10; matches: 10; rate: 100%.

---

Notes (non-findings)

These are not validation findings; they are observations for future authoring/maintenance.

1. Heavy reliance on upstream README. 17 of 22 citations point at temporalio/sdk-python:contrib/langsmith/README.md. This is appropriate because the docs site does not yet cover LangSmith — but the reference will drift if the upstream README is restructured. The <!-- VERIFY: ... --> reminder at line 11 already flags one such future drift (re-checking the integrations index). Consider an analogous note for the README itself.
2. openai.responses.create token. Present in the trace tree example. Verified verbatim against the upstream README. If the upstream README later switches its example to a different OpenAI call (e.g., chat.completions.create), this token would become stale; no action needed today.
3. No CLI / TLS / Cloud surface touched. As expected for a pure-SDK plugin reference, so most of the universal regression patterns are inapplicable rather than actively avoided.

End of report.