diff --git a/packages/server/src/server/agent/providers/pi/extensions/gotgenes-pi-subagents/fixtures/refused-resume.json b/packages/server/src/server/agent/providers/pi/extensions/gotgenes-pi-subagents/fixtures/refused-resume.json
new file mode 100644
index 0000000000..b275677a29
--- /dev/null
+++ b/packages/server/src/server/agent/providers/pi/extensions/gotgenes-pi-subagents/fixtures/refused-resume.json
@@ -0,0 +1,68 @@
+{
+  "provenance": {
+    "package": "@gotgenes/pi-subagents",
+    "version": "23.4.0",
+    "sourceCommit": "63476ff869efd8ea339040f496fa734048b89e70",
+    "piVersion": "0.84.4",
+    "captureDate": "2026-10-19"
+  },
+  "events": [
+    {
+      "type": "tool_execution_start",
+      "toolCallId": "resume-call",
+      "toolName": "subagent",
+      "args": {
+        "subagent_type": "general-purpose",
+        "description": "resume",
+        "prompt": "Continue",
+        "resume": "expired-child",
+        "run_in_background": true
+      }
+    },
+    {
+      "type": "tool_execution_end",
+      "toolCallId": "resume-call",
+      "toolName": "subagent",
+      "result": {
+        "content": [
+          {
+            "type": "text",
+            "text": "Agent \"expired-child\" had its session released after its retention window; resume is unavailable, but its result is still retrievable via get_subagent_result."
+          }
+        ]
+      },
+      "isError": false
+    }
+  ],
+  "messages": [
+    {
+      "role": "assistant",
+      "content": [
+        {
+          "type": "toolCall",
+          "id": "resume-call",
+          "name": "subagent",
+          "arguments": {
+            "subagent_type": "general-purpose",
+            "description": "resume",
+            "prompt": "Continue",
+            "resume": "expired-child",
+            "run_in_background": true
+          }
+        }
+      ]
+    },
+    {
+      "role": "toolResult",
+      "toolCallId": "resume-call",
+      "toolName": "subagent",
+      "content": [
+        {
+          "type": "text",
+          "text": "Agent \"expired-child\" had its session released after its retention window; resume is unavailable, but its result is still retrievable via get_subagent_result."
+        }
+      ],
+      "isError": false
+    }
+  ]
+}
diff --git a/packages/server/src/server/agent/providers/pi/extensions/gotgenes-pi-subagents/index.test.ts b/packages/server/src/server/agent/providers/pi/extensions/gotgenes-pi-subagents/index.test.ts
index 6bbe1b3b06..f89a9aefd3 100644
--- a/packages/server/src/server/agent/providers/pi/extensions/gotgenes-pi-subagents/index.test.ts
+++ b/packages/server/src/server/agent/providers/pi/extensions/gotgenes-pi-subagents/index.test.ts
@@ -1,5 +1,6 @@
 import { describe, expect, test } from "vitest";
 import { fileURLToPath } from "node:url";
+import { ProviderSubagentStore } from "../../../../provider-subagents/store.js";
 import { createPiExtensionHost } from "../index.js";
 import { readSubagentFixture, verifySubagentFixture } from "../subagent-fixture-test.js";
 import { streamPiHistory } from "../../history-mapper.js";
@@ -25,6 +26,31 @@ function publishService(agents: Array<{ id: string; outputFile?: string }>): voi
 }
 
 describe("@gotgenes/pi-subagents adapter", () => {
+  test.each([true, false])(
+    "removes a refused resume from live and replayed subagents (background=%s)",
+    async (background) => {
+      // The result came from 23.4.0's real AgentTool and SubagentManager after releaseSession().
+      // The child session was a fake; releaseSession replaced waiting for the retention sweep.
+      const fixture = readSubagentFixture(
+        new URL("./fixtures/refused-resume.json", import.meta.url),
+      );
+      const start = fixture.events[0]!;
+      if (start.type !== "tool_execution_start") throw new Error("Expected a tool start");
+      start.args = { ...(start.args as object), run_in_background: background };
+      const assistant = fixture.messages[0]!;
+      if (assistant.role !== "assistant") throw new Error("Expected an assistant tool call");
+      for (const block of assistant.content) {
+        if (block.type === "toolCall") block.arguments = start.args;
+      }
+      const events = await verifySubagentFixture(fixture);
+      const store = new ProviderSubagentStore();
+      store.apply("parent", "pi", { type: "upsert", id: "previous-child", status: "completed" });
+      for (const event of events) store.apply("parent", "pi", event.event);
+      expect(events.map(({ event }) => event.type)).toEqual(["upsert", "remove"]);
+      expect(store.list("parent")).toMatchObject([{ id: "previous-child", status: "completed" }]);
+    },
+  );
+
   test("reports a child's file after the child republishes the gotgenes service", async () => {
     const notifications: string[] = [];
     const emit = loadRuntimeBridge();
diff --git a/packages/server/src/server/agent/providers/pi/extensions/gotgenes-pi-subagents/index.ts b/packages/server/src/server/agent/providers/pi/extensions/gotgenes-pi-subagents/index.ts
index 62db93c79e..e1869705f8 100644
--- a/packages/server/src/server/agent/providers/pi/extensions/gotgenes-pi-subagents/index.ts
+++ b/packages/server/src/server/agent/providers/pi/extensions/gotgenes-pi-subagents/index.ts
@@ -86,7 +86,7 @@ export const gotgenesPiSubagents: PiExtension = {
               detail,
               subagents: [{ type: "upsert" as const, id: call.callId, status: "failed" as const }],
             }
-          : { detail };
+          : { detail, subagents: [{ type: "remove" as const, id: call.callId }] };
       callsByAgent.set(details.data.agentId, call.callId);
       const file =
         outputFileFromToolResult(call.result) ?? pendingFilesByAgent.get(details.data.agentId);