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fix(langchain-core): handle missing parent runs in tracer to prevent LangSmith 400 errors #9114

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fix(langchain-core): handle missing parent runs in tracer to prevent LangSmith 400 errors #9114

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debe7c6
fix(langchain-core): handle missing parent runs in tracer to prevent …
yukukotani Oct 4, 2025
1ec2784
doc: add changeset
yukukotani Oct 4, 2025
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5 changes: 5 additions & 0 deletions .changeset/tall-jeans-drop.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
"@langchain/core": patch
---

handle missing parent runs in tracer to prevent LangSmith 400 errors
5 changes: 5 additions & 0 deletions langchain-core/src/tracers/base.ts
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Expand Up @@ -165,6 +165,11 @@ export abstract class BaseTracer extends BaseCallbackHandler {
// console.debug(
// `Parent run with UUID ${storedRun.parent_run_id} not found.`
// );

// Child run with no trace_id and dotted_order causes 400 error on LangSmith.
// So we set the parent_run_id to undefined as a workaround.
// This run will be shown as isolated run on LangSmith.
storedRun.parent_run_id = undefined;
}
} else {
storedRun.trace_id = storedRun.id;
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