diff --git a/src/backend/codex-stdio.ts b/src/backend/codex-stdio.ts
index d7bc8e5..dc1e57c 100644
--- a/src/backend/codex-stdio.ts
+++ b/src/backend/codex-stdio.ts
@@ -8,7 +8,7 @@ import type { BackendEvent, BackendProfile, BackendTurnResult, CommandRecord, Fa
 import { redactJson, redactText } from "../common/redaction.js";
 import { backendProfileSpec } from "../common/backend-profiles.js";
 import { boundedTextSummary, commandOutputPayload } from "../common/output.js";
-import { emitAgentRunOtelSpan } from "../common/otel-trace.js";
+import { agentRunBusinessTraceId, emitAgentRunOtelSpan } from "../common/otel-trace.js";
 import { agentRunKafkaConfig, publishAgentRunKafkaMessageBestEffort, rawFrameValue, safeText, sha256Hex, type AgentRunKafkaConfig } from "../common/kafka-events.js";
 
 const codexProtocol = "codex-app-server-jsonrpc-stdio";
@@ -457,6 +457,7 @@ function codexStdioKafkaContext(options: CodexStdioTurnOptions): CodexStdioKafka
   const run = options.otelContext?.run;
   const command = options.otelContext?.command;
   return {
+    traceId: agentRunBusinessTraceId(run, command),
     runId: run?.id ?? null,
     commandId: command?.id ?? null,
     attemptId: safeText(options.otelContext?.attemptId) ?? null,