@@ -185,12 +185,12 @@ export function resetEngineTelemetryForTests(): void {
   precedenceSeen.clear()
 }
 
-export function trackEngineError(stage: EngineStage, message: string): void {
+export function trackEngineError(stage: EngineStage, message: string, sessionID?: string): void {
   try {
     Telemetry.track({
       type: "workspace_engine_error",
       timestamp: Date.now(),
-      session_id: sessionId(),
+      session_id: sessionID ?? sessionId(),
       stage,
       message: Telemetry.maskString(message).slice(0, 200),
     })
 
@@ -533,7 +533,7 @@ export async function refresh(
     result = await derive(sessionID, tools)
   } catch (err) {
     log.warn("precedence could not be derived; running locally with a notice", { sessionID, err: String(err) })
-    trackEngineError("precedence", String(err))
+    trackEngineError("precedence", String(err), sessionID)
     result = EMPTY("derive-failed")
   }
   if (ruleset) result.ruleset = ruleset
 
@@ -137,6 +137,8 @@ describe("workspace engine telemetry builders", () => {
     expect(err.stage).toBe("attach")
     expect(err.message.length).toBeLessThanOrEqual(200)
     expect(err.message).not.toContain("/home/someone")
+    trackEngineError("precedence", "derive boom", "ses_p")
+    expect(events.at(-1)).toEqual(expect.objectContaining({ stage: "precedence", session_id: "ses_p" }))
     trackRedirect("datamate", "status", 9)
     expect(events.at(-1)).toEqual(
       expect.objectContaining({
Original file line number	Diff line number	Diff line change
`@@ -533,7 +533,7 @@ export async function refresh(`
`533`	`533`	`result = await derive(sessionID, tools)`
`534`	`534`	`} catch (err) {`
`535`	`535`	`log.warn("precedence could not be derived; running locally with a notice", { sessionID, err: String(err) })`
`536`		`- trackEngineError("precedence", String(err))`
	`536`	`+ trackEngineError("precedence", String(err), sessionID)`
`537`	`537`	`result = EMPTY("derive-failed")`
`538`	`538`	`}`
`539`	`539`	`if (ruleset) result.ruleset = ruleset`