diff --git a/packages/opencode/index.ts b/packages/opencode/index.ts
index 3f0a30c..70d4504 100644
--- a/packages/opencode/index.ts
+++ b/packages/opencode/index.ts
@@ -88,7 +88,8 @@ async function executeSessionCommand(
     query: { directory: context.directory },
     body: {
       ...(sessionCommand.agent ? { agent: sessionCommand.agent } : {}),
-      parts: [{ type: "text", text: sessionCommand.prompt }],
+      // Queue the delegated turn without surfacing the prompt as a normal user message.
+      parts: [{ type: "text", text: sessionCommand.prompt, synthetic: true }],
     },
   });
 
diff --git a/packages/opencode/test/tool-registration.test.ts b/packages/opencode/test/tool-registration.test.ts
index 629b6b5..930bb45 100644
--- a/packages/opencode/test/tool-registration.test.ts
+++ b/packages/opencode/test/tool-registration.test.ts
@@ -294,7 +294,7 @@ describe("createOpenCodeTools", () => {
         query: { directory: process.cwd() },
         body: {
           agent: "reviewer",
-          parts: [{ type: "text", text: result.prompt }],
+          parts: [{ type: "text", text: result.prompt, synthetic: true }],
         },
       });
       assert.equal(client.sessionPrompts.length, 0);