chore: send_message and followup_task do not return anything (#17008)

codex-rs/tools/src/agent_tool.rs

@@ -155,7 +155,7 @@ pub fn create_send_message_tool() -> ToolSpec {
             required: Some(vec!["target".to_string(), "message".to_string()]),
             additional_properties: Some(false.into()),
         },
-        output_schema: Some(send_input_output_schema()),
+        output_schema: None,
     })
 }
 
@@ -197,7 +197,7 @@ pub fn create_followup_task_tool() -> ToolSpec {
             required: Some(vec!["target".to_string(), "message".to_string()]),
             additional_properties: Some(false.into()),
         },
-        output_schema: Some(send_input_output_schema()),
+        output_schema: None,
     })
 }
 

codex-rs/tools/src/agent_tool_tests.rs

@@ -97,7 +97,7 @@ fn spawn_agent_tool_v1_keeps_legacy_fork_context_field() {
 }
 
 #[test]
-fn send_message_tool_requires_message_and_uses_submission_output() {
+fn send_message_tool_requires_message_and_has_no_output_schema() {
     let ToolSpec::Function(ResponsesApiTool {
         parameters,
         output_schema,
@@ -122,14 +122,11 @@ fn send_message_tool_requires_message_and_uses_submission_output() {
         required,
         Some(vec!["target".to_string(), "message".to_string()])
     );
-    assert_eq!(
-        output_schema.expect("send_message output schema")["required"],
-        json!(["submission_id"])
-    );
+    assert_eq!(output_schema, None);
 }
 
 #[test]
-fn followup_task_tool_requires_message_and_uses_submission_output() {
+fn followup_task_tool_requires_message_and_has_no_output_schema() {
     let ToolSpec::Function(ResponsesApiTool {
         parameters,
         output_schema,
@@ -154,10 +151,7 @@ fn followup_task_tool_requires_message_and_uses_submission_output() {
         required,
         Some(vec!["target".to_string(), "message".to_string()])
     );
-    assert_eq!(
-        output_schema.expect("followup_task output schema")["required"],
-        json!(["submission_id"])
-    );
+    assert_eq!(output_schema, None);
 }
 
 #[test]

codex-rs/tools/src/tool_registry_plan_tests.rs

@@ -246,9 +246,15 @@ fn test_build_specs_multi_agent_v2_uses_task_names_and_hides_resume() {
     assert_eq!(output_schema["required"], json!(["task_name", "nickname"]));
 
     let send_message = find_tool(&tools, "send_message");
-    let ToolSpec::Function(ResponsesApiTool { parameters, .. }) = &send_message.spec else {
+    let ToolSpec::Function(ResponsesApiTool {
+        parameters,
+        output_schema,
+        ..
+    }) = &send_message.spec
+    else {
         panic!("send_message should be a function tool");
     };
+    assert_eq!(output_schema, &None);
     let JsonSchema::Object {
         properties,
         required,
@@ -267,9 +273,15 @@ fn test_build_specs_multi_agent_v2_uses_task_names_and_hides_resume() {
     );
 
     let followup_task = find_tool(&tools, "followup_task");
-    let ToolSpec::Function(ResponsesApiTool { parameters, .. }) = &followup_task.spec else {
+    let ToolSpec::Function(ResponsesApiTool {
+        parameters,
+        output_schema,
+        ..
+    }) = &followup_task.spec
+    else {
         panic!("followup_task should be a function tool");
     };
+    assert_eq!(output_schema, &None);
     let JsonSchema::Object {
         properties,
         required,