diff --git a/server/src/__tests__/heartbeat-run-privacy-routes.test.ts b/server/src/__tests__/heartbeat-run-privacy-routes.test.ts
index a610b5b25bd..c0aec0471b4 100644
--- a/server/src/__tests__/heartbeat-run-privacy-routes.test.ts
+++ b/server/src/__tests__/heartbeat-run-privacy-routes.test.ts
@@ -384,6 +384,30 @@ describeEmbeddedPostgres("heartbeat run privacy routes", { concurrent: false },
     }
   });
 
+  it("keeps cursor projection state out of public run responses", async () => {
+    const fixture = await seedFixture();
+    const resultJson = { summary: "Maintenance complete", eventCursorProjectionSeq: "payload value" };
+    await db.update(heartbeatRuns).set({
+      eventCursorProjectionSeq: 41,
+      eventCursorRebuildPending: true,
+      resultJson,
+    }).where(eq(heartbeatRuns.id, fixture.maintenanceRunId));
+    const app = createBoardApp(fixture.companyId, fixture.ownerUserId);
+    const detail = await request(app).get(`/api/heartbeat-runs/${fixture.maintenanceRunId}`).expect(200);
+    const history = await request(app).get(`/api/companies/${fixture.companyId}/heartbeat-runs`).expect(200);
+    const cancelled = await request(app).post(`/api/heartbeat-runs/${fixture.maintenanceRunId}/cancel`).expect(200);
+    const listed = history.body.find((run: { id: string }) => run.id === fixture.maintenanceRunId);
+    for (const response of [detail.body, listed, cancelled.body]) {
+      expect(response).toMatchObject({ id: fixture.maintenanceRunId, status: "succeeded" });
+      expect(response).not.toHaveProperty("eventCursorProjectionSeq");
+      expect(response).not.toHaveProperty("eventCursorRebuildPending");
+    }
+    expect(detail.body.resultJson).toEqual(resultJson);
+    expect(cancelled.body.resultJson).toEqual(resultJson);
+    const [stored] = await db.select().from(heartbeatRuns).where(eq(heartbeatRuns.id, fixture.maintenanceRunId));
+    expect(stored).toMatchObject({ eventCursorProjectionSeq: 41, eventCursorRebuildPending: true, resultJson });
+  });
+
   it("filters private task links from a readable company run while preserving authorized links", async () => {
     const fixture = await seedFixture();
     const publicIssueId = randomUUID();
diff --git a/server/src/routes/agents.ts b/server/src/routes/agents.ts
index 756fed8a50e..08508aafaae 100644
--- a/server/src/routes/agents.ts
+++ b/server/src/routes/agents.ts
@@ -299,6 +299,7 @@ import {
   getHeartbeatRunReadDecisions,
   canActorReadWorkspaceOperation,
   redactHeartbeatRunListRow,
+  toPublicHeartbeatRun,
 } from "../services/heartbeat-run-privacy.js";
 import {
   PaperclipRunnerProviderProfileError,
@@ -6330,7 +6331,7 @@ export function agentRoutes(
       });
     }
 
-    res.status(202).json(run);
+    res.status(202).json(toPublicHeartbeatRun(run));
   };
 
   router.post("/agents/:id/wakeup", validate(wakeAgentSchema), async (req, res) => {
@@ -6455,7 +6456,7 @@ export function agentRoutes(
       });
     }
 
-    res.status(202).json(run);
+    res.status(202).json(toPublicHeartbeatRun(run));
   });
 
   router.post("/agents/:id/claude-login", async (req, res) => {
@@ -7168,7 +7169,7 @@ export function agentRoutes(
       run.companyId,
       run.id,
       redactCurrentUserValue(
-        { ...decoratedRun, execution: await executionProjectionForRun(db, run.companyId, run.id), identityHistory: await listRunIdentityContexts(db, run.companyId, run.id), retryExhaustedReason, outputSilence: await heartbeat.buildRunOutputSilence(run) },
+        toPublicHeartbeatRun({ ...decoratedRun, execution: await executionProjectionForRun(db, run.companyId, run.id), identityHistory: await listRunIdentityContexts(db, run.companyId, run.id), retryExhaustedReason, outputSilence: await heartbeat.buildRunOutputSilence(run) }),
         await getCurrentUserRedactionOptions(),
       ),
       req.actor.type === "board" ? getActorInfo(req).actorId : null,
@@ -7205,7 +7206,7 @@ export function agentRoutes(
       });
     }
 
-    res.json(run ? await runRedactions.redactForRun(run.companyId, run.id, run,
+    res.json(run ? await runRedactions.redactForRun(run.companyId, run.id, toPublicHeartbeatRun(run),
       getActorInfo(req).actorId) : null);
   });
 
diff --git a/server/src/services/heartbeat-run-privacy.ts b/server/src/services/heartbeat-run-privacy.ts
index d1cb41a19a2..7e17d7ca177 100644
--- a/server/src/services/heartbeat-run-privacy.ts
+++ b/server/src/services/heartbeat-run-privacy.ts
@@ -10,6 +10,16 @@ type RunIssueBinding = {
   issueId?: string | null;
 };
 
+/** Keep derived ingestion state out of the public run response contract. */
+export function toPublicHeartbeatRun<T extends Record<string, unknown>>(run: T) {
+  const {
+    eventCursorProjectionSeq: _eventCursorProjectionSeq,
+    eventCursorRebuildPending: _eventCursorRebuildPending,
+    ...response
+  } = run;
+  return response;
+}
+
 export async function canActorReadHeartbeatRun(
   db: Db,
   access: {