diff --git a/src/infra/heartbeat-reason.test.ts b/src/infra/heartbeat-reason.test.ts
new file mode 100644
index 0000000000..6c2fdc68f9
--- /dev/null
+++ b/src/infra/heartbeat-reason.test.ts
@@ -0,0 +1,52 @@
+import { describe, expect, it } from "vitest";
+import {
+  isHeartbeatActionWakeReason,
+  isHeartbeatEventDrivenReason,
+  normalizeHeartbeatWakeReason,
+  resolveHeartbeatReasonKind,
+} from "./heartbeat-reason.js";
+
+describe("heartbeat-reason", () => {
+  it("normalizes wake reasons with trim + requested fallback", () => {
+    expect(normalizeHeartbeatWakeReason("  cron:job-1  ")).toBe("cron:job-1");
+    expect(normalizeHeartbeatWakeReason("  ")).toBe("requested");
+    expect(normalizeHeartbeatWakeReason(undefined)).toBe("requested");
+  });
+
+  it("classifies known reason kinds", () => {
+    expect(resolveHeartbeatReasonKind("retry")).toBe("retry");
+    expect(resolveHeartbeatReasonKind("interval")).toBe("interval");
+    expect(resolveHeartbeatReasonKind("manual")).toBe("manual");
+    expect(resolveHeartbeatReasonKind("exec-event")).toBe("exec-event");
+    expect(resolveHeartbeatReasonKind("wake")).toBe("wake");
+    expect(resolveHeartbeatReasonKind("cron:job-1")).toBe("cron");
+    expect(resolveHeartbeatReasonKind("hook:wake")).toBe("hook");
+    expect(resolveHeartbeatReasonKind("  hook:wake  ")).toBe("hook");
+  });
+
+  it("classifies unknown reasons as other", () => {
+    expect(resolveHeartbeatReasonKind("requested")).toBe("other");
+    expect(resolveHeartbeatReasonKind("slow")).toBe("other");
+    expect(resolveHeartbeatReasonKind("")).toBe("other");
+    expect(resolveHeartbeatReasonKind(undefined)).toBe("other");
+  });
+
+  it("matches event-driven behavior used by heartbeat preflight", () => {
+    expect(isHeartbeatEventDrivenReason("exec-event")).toBe(true);
+    expect(isHeartbeatEventDrivenReason("cron:job-1")).toBe(true);
+    expect(isHeartbeatEventDrivenReason("wake")).toBe(true);
+    expect(isHeartbeatEventDrivenReason("hook:gmail:sync")).toBe(true);
+    expect(isHeartbeatEventDrivenReason("interval")).toBe(false);
+    expect(isHeartbeatEventDrivenReason("manual")).toBe(false);
+    expect(isHeartbeatEventDrivenReason("other")).toBe(false);
+  });
+
+  it("matches action-priority wake behavior", () => {
+    expect(isHeartbeatActionWakeReason("manual")).toBe(true);
+    expect(isHeartbeatActionWakeReason("exec-event")).toBe(true);
+    expect(isHeartbeatActionWakeReason("hook:wake")).toBe(true);
+    expect(isHeartbeatActionWakeReason("interval")).toBe(false);
+    expect(isHeartbeatActionWakeReason("cron:job-1")).toBe(false);
+    expect(isHeartbeatActionWakeReason("retry")).toBe(false);
+  });
+});
diff --git a/src/infra/heartbeat-reason.ts b/src/infra/heartbeat-reason.ts
new file mode 100644
index 0000000000..968b1e2406
--- /dev/null
+++ b/src/infra/heartbeat-reason.ts
@@ -0,0 +1,54 @@
+export type HeartbeatReasonKind =
+  | "retry"
+  | "interval"
+  | "manual"
+  | "exec-event"
+  | "wake"
+  | "cron"
+  | "hook"
+  | "other";
+
+function trimReason(reason?: string): string {
+  return typeof reason === "string" ? reason.trim() : "";
+}
+
+export function normalizeHeartbeatWakeReason(reason?: string): string {
+  const trimmed = trimReason(reason);
+  return trimmed.length > 0 ? trimmed : "requested";
+}
+
+export function resolveHeartbeatReasonKind(reason?: string): HeartbeatReasonKind {
+  const trimmed = trimReason(reason);
+  if (trimmed === "retry") {
+    return "retry";
+  }
+  if (trimmed === "interval") {
+    return "interval";
+  }
+  if (trimmed === "manual") {
+    return "manual";
+  }
+  if (trimmed === "exec-event") {
+    return "exec-event";
+  }
+  if (trimmed === "wake") {
+    return "wake";
+  }
+  if (trimmed.startsWith("cron:")) {
+    return "cron";
+  }
+  if (trimmed.startsWith("hook:")) {
+    return "hook";
+  }
+  return "other";
+}
+
+export function isHeartbeatEventDrivenReason(reason?: string): boolean {
+  const kind = resolveHeartbeatReasonKind(reason);
+  return kind === "exec-event" || kind === "cron" || kind === "wake" || kind === "hook";
+}
+
+export function isHeartbeatActionWakeReason(reason?: string): boolean {
+  const kind = resolveHeartbeatReasonKind(reason);
+  return kind === "manual" || kind === "exec-event" || kind === "hook";
+}
diff --git a/src/infra/heartbeat-runner.ts b/src/infra/heartbeat-runner.ts
index f325a3729a..70ee5e34e1 100644
--- a/src/infra/heartbeat-runner.ts
+++ b/src/infra/heartbeat-runner.ts
@@ -49,6 +49,7 @@ import {
   isExecCompletionEvent,
 } from "./heartbeat-events-filter.js";
 import { emitHeartbeatEvent, resolveIndicatorType } from "./heartbeat-events.js";
+import { resolveHeartbeatReasonKind } from "./heartbeat-reason.js";
 import { resolveHeartbeatVisibility } from "./heartbeat-visibility.js";
 import {
   type HeartbeatRunResult,
@@ -491,10 +492,11 @@ type HeartbeatPreflight = HeartbeatReasonFlags & {
 };
 
 function resolveHeartbeatReasonFlags(reason?: string): HeartbeatReasonFlags {
+  const reasonKind = resolveHeartbeatReasonKind(reason);
   return {
-    isExecEventReason: reason === "exec-event",
-    isCronEventReason: Boolean(reason?.startsWith("cron:")),
-    isWakeReason: reason === "wake" || Boolean(reason?.startsWith("hook:")),
+    isExecEventReason: reasonKind === "exec-event",
+    isCronEventReason: reasonKind === "cron",
+    isWakeReason: reasonKind === "wake" || reasonKind === "hook",
   };
 }
 
diff --git a/src/infra/heartbeat-wake.ts b/src/infra/heartbeat-wake.ts
index d1dcfb0395..bccfdfe982 100644
--- a/src/infra/heartbeat-wake.ts
+++ b/src/infra/heartbeat-wake.ts
@@ -1,3 +1,9 @@
+import {
+  isHeartbeatActionWakeReason,
+  normalizeHeartbeatWakeReason,
+  resolveHeartbeatReasonKind,
+} from "./heartbeat-reason.js";
+
 export type HeartbeatRunResult =
   | { status: "ran"; durationMs: number }
   | { status: "skipped"; reason: string }
@@ -29,7 +35,6 @@ let timerKind: WakeTimerKind | null = null;
 
 const DEFAULT_COALESCE_MS = 250;
 const DEFAULT_RETRY_MS = 1_000;
-const HOOK_REASON_PREFIX = "hook:";
 const REASON_PRIORITY = {
   RETRY: 0,
   INTERVAL: 1,
@@ -37,29 +42,22 @@ const REASON_PRIORITY = {
   ACTION: 3,
 } as const;
 
-function isActionWakeReason(reason: string): boolean {
-  return reason === "manual" || reason === "exec-event" || reason.startsWith(HOOK_REASON_PREFIX);
-}
-
 function resolveReasonPriority(reason: string): number {
-  if (reason === "retry") {
+  const kind = resolveHeartbeatReasonKind(reason);
+  if (kind === "retry") {
     return REASON_PRIORITY.RETRY;
   }
-  if (reason === "interval") {
+  if (kind === "interval") {
     return REASON_PRIORITY.INTERVAL;
   }
-  if (isActionWakeReason(reason)) {
+  if (isHeartbeatActionWakeReason(reason)) {
     return REASON_PRIORITY.ACTION;
   }
   return REASON_PRIORITY.DEFAULT;
 }
 
 function normalizeWakeReason(reason?: string): string {
-  if (typeof reason !== "string") {
-    return "requested";
-  }
-  const trimmed = reason.trim();
-  return trimmed.length > 0 ? trimmed : "requested";
+  return normalizeHeartbeatWakeReason(reason);
 }
 
 function normalizeWakeTarget(value?: string): string | undefined {