diff --git a/src/server/registerDesktopApplicationTool.ts b/src/server/registerDesktopApplicationTool.ts
index 7a8b142005..d076705b86 100644
--- a/src/server/registerDesktopApplicationTool.ts
+++ b/src/server/registerDesktopApplicationTool.ts
@@ -5,11 +5,8 @@ import type { EvidenceLookup } from "../application/EvidenceInputResolver.js";
 import type { EvidenceWriter } from "../application/investigation/InvestigationRecordPort.js";
 import type { WithAdmittedAnalysis } from "./analysisAdmission.js";
 import { toolContract } from "../contracts/toolContracts.js";
-import { createEvidenceToolHandler } from "./contractToolHandler.js";
+import { createRetainedSummaryToolHandler } from "./contractToolHandler.js";
 import { applicationToolRegistrationOptions } from "./toolRegistrationOptions.js";
-import { retainedSummaryDelivery } from "./retainedSummaryDelivery.js";
-import { analysisInputErrorFromIssues } from "../domain/inputIssueProjection.js";
-import { err } from "../domain/result.js";
 
 /** Bind the named contract and refuse unretained summary delivery before I/O. */
 export const registerDesktopApplicationTool = (
@@ -21,34 +18,17 @@ export const registerDesktopApplicationTool = (
   evidenceById: EvidenceLookup | undefined,
 ): void => {
   const contract = toolContract("inspect_desktop_application");
-  const delivery = retainedSummaryDelivery(new Set([contract.name]), {
-    recordEvidence,
-    evidenceById,
-  });
-  const handler = createEvidenceToolHandler(
+  const handler = createRetainedSummaryToolHandler(
     server,
-    async (raw, options) => {
-      const parsed = contract.inputSchema.safeParse(raw);
-      if (!parsed.success)
-        return err(
-          analysisInputErrorFromIssues(contract.name, parsed.error.issues, raw),
-        );
-      const { detail, ...input } = parsed.data;
-      const parameters = { detail };
-      const ready = delivery.preflight(contract.name, parameters);
-      if (!ready.ok) return ready;
-      const result = await service.inspect(input, options);
-      return result.ok
-        ? delivery.projectEvidence(contract.name, parameters, result.value)
-        : result;
-    },
+    contract,
+    (input, options) => service.inspect(input, options),
     logger,
-    recordEvidence,
+    { recordEvidence, evidenceById },
     withAdmittedAnalysis,
   );
   server.registerTool(
     contract.name,
     applicationToolRegistrationOptions(contract),
-    handler(contract),
+    handler,
   );
 };