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feat: Add langsmith tracing #2224

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feat: Add langsmith tracing #2224

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4ef3513
feat: Add `langsmith` tracing
lforst Jul 13, 2026
77086b1
fix
lforst Jul 13, 2026
8e3d35f
fixes and cleanup
lforst Jul 14, 2026
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5 changes: 5 additions & 0 deletions .changeset/sixty-seals-judge.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
"braintrust": minor
---

feat: Add `langsmith` tracing
10 changes: 10 additions & 0 deletions .gitleaks.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,16 @@ title = "Braintrust SDK gitleaks config"
# Use the default gitleaks ruleset as the base
useDefault = true

[[allowlists]]
description = "LangSmith E2E variant identifiers are not API keys"
condition = "AND"
targetRules = ["generic-api-key"]
regexes = ['''^langsmith-v0-(3-30|5-11|8-1)$''']
paths = [
'''^e2e/config/pr-comment-scenarios\.json$''',
'''^e2e/scenarios/langsmith-instrumentation/scenario\.test\.ts$''',
]

[[rules]]
id = "braintrust-api-key"
description = "Braintrust API key"
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10 changes: 10 additions & 0 deletions e2e/config/pr-comment-scenarios.json
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Original file line number Diff line number Diff line change
Expand Up @@ -139,6 +139,16 @@
"label": "LangGraph Auto-Instrumentation",
"metadataScenario": "langgraph-auto-instrumentation"
},
{
"scenarioDirName": "langsmith-instrumentation",
"label": "LangSmith Instrumentation",
"metadataScenario": "langsmith-instrumentation",
"variants": [
{ "variantKey": "langsmith-v0-3-30", "label": "v0.3.30" },
{ "variantKey": "langsmith-v0-5-11", "label": "v0.5.11" },
{ "variantKey": "langsmith-v0-8-1", "label": "v0.8.1" }
]
},
{
"scenarioDirName": "mistral-instrumentation",
"label": "Mistral Instrumentation",
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202 changes: 202 additions & 0 deletions ...enarios/langsmith-instrumentation/__snapshots__/langsmith-v0-3-30-auto-esm.span-tree.json
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{
"span_tree": [
{
"name": "support-assistant",
"type": "task",
"children": [
{
"name": "retrieve-context",
"type": "tool",
"children": [],
"input": {
"query": "What is the refund window?"
},
"output": {
"documents": [
"Refund policy"
]
},
"tags": [
"knowledge-base"
],
"metadata": {
"data_source": "support-kb",
"scenario": "langsmith-instrumentation"
}
},
{
"name": "ChatOpenAI",
"type": "llm",
"children": [],
"input": {
"args": [
{
"max_tokens": 64,
"messages": [
{
"content": "Answer using only this context: Refund requests are accepted within 30 days of purchase.",
"role": "system"
},
{
"content": "What is the refund window?",
"role": "user"
}
],
"model": "gpt-4o-mini",
"temperature": 0
},
{}
]
},
"output": {
"choices": [
{
"finish_reason": "stop",
"index": 0,
"message": {
"content": "Refund requests are accepted within 30 days of purchase.",
"role": "assistant"
}
}
],
"created": 0,
"id": "<span:1>",
"model": "gpt-4o-mini-2024-07-18",
"object": "chat.completion"
},
"tags": [
"openai",
"chat-completion"
],
"metadata": {
"customer_tier": "enterprise",
"deployment": "local-fixture",
"max_tokens": 64,
"model": "gpt-4o-mini",
"provider": "openai",
"scenario": "langsmith-instrumentation",
"temperature": 0
},
"metrics": {
"completion_tokens": 7,
"prompt_cached_tokens": 4,
"prompt_tokens": 18,
"tokens": 25
}
}
],
"input": {
"question": "What is the refund window?"
},
"output": {
"answer": "Refund requests are accepted within 30 days of purchase.",
"source": "Refund policy"
},
"tags": [
"support"
],
"metadata": {
"customer_id": "customer-123",
"scenario": "langsmith-instrumentation"
}
},
{
"name": "lookup-customer-record",
"type": "tool",
"children": [],
"metadata": {
"scenario": "langsmith-instrumentation"
},
"error": "Error: customer record unavailable"
},
{
"name": "manual-rag-pipeline",
"type": "task",
"children": [
{
"name": "embed-query",
"type": "llm",
"children": [],
"input": {
"text": "Which policy applies?"
},
"output": {
"embedding": [
0.1,
0.2
]
},
"tags": [
"manual"
],
"metadata": {
"model": "manual-model",
"provider": "manual-provider"
},
"metrics": {
"completion_tokens": 0,
"prompt_cached_tokens": 1,
"prompt_tokens": 3,
"time_to_first_token": 0,
"tokens": 3
}
}
],
"input": {
"question": "Which policy applies?"
},
"output": {
"matched_document": "Refund policy"
},
"metadata": {
"scenario": "langsmith-instrumentation"
}
},
{
"name": "direct-search-index",
"type": "tool",
"children": [],
"input": {
"query": "refund window",
"top_k": 3
},
"output": {
"documents": [
"Refund policy"
]
},
"metadata": {
"scenario": "langsmith-instrumentation"
}
},
{
"name": "offline-document-enrichment",
"type": "task",
"children": [
{
"name": "extract-keywords",
"type": "tool",
"children": [],
"input": {
"document": "Refund requests are accepted within 30 days."
},
"output": {
"keywords": [
"refund",
"30 days"
]
}
}
],
"input": {
"document_count": 1
},
"output": {
"enriched_documents": 1
},
"metadata": {
"scenario": "langsmith-instrumentation"
}
}
]
}
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