diff --git a/src/agent/loop_.rs b/src/agent/loop_.rs
index e486d3136..ff76498d7 100644
--- a/src/agent/loop_.rs
+++ b/src/agent/loop_.rs
@@ -2208,6 +2208,7 @@ mod tests {
                 .map(|text| ChatResponse {
                     text: Some(text.to_string()),
                     tool_calls: Vec::new(),
+                    usage: None,
                 })
                 .collect();
             Self {
diff --git a/src/tools/delegate.rs b/src/tools/delegate.rs
index 94793e1f8..4c5a8c23a 100644
--- a/src/tools/delegate.rs
+++ b/src/tools/delegate.rs
@@ -598,6 +598,7 @@ mod tests {
                 Ok(ChatResponse {
                     text: Some("done".to_string()),
                     tool_calls: Vec::new(),
+                    usage: None,
                 })
             } else {
                 Ok(ChatResponse {
@@ -607,6 +608,7 @@ mod tests {
                         name: "echo_tool".to_string(),
                         arguments: "{\"value\":\"ping\"}".to_string(),
                     }],
+                    usage: None,
                 })
             }
         }
@@ -639,6 +641,7 @@ mod tests {
                     name: "echo_tool".to_string(),
                     arguments: "{\"value\":\"x\"}".to_string(),
                 }],
+                usage: None,
             })
         }
     }
diff --git a/tests/agent_e2e.rs b/tests/agent_e2e.rs
index 6bdfb36d5..f7d1b10e0 100644
--- a/tests/agent_e2e.rs
+++ b/tests/agent_e2e.rs
@@ -64,6 +64,7 @@ impl Provider for MockProvider {
             return Ok(ChatResponse {
                 text: Some("done".into()),
                 tool_calls: vec![],
+                usage: None,
             });
         }
         Ok(guard.remove(0))
@@ -188,6 +189,7 @@ impl Provider for RecordingProvider {
             return Ok(ChatResponse {
                 text: Some("done".into()),
                 tool_calls: vec![],
+                usage: None,
             });
         }
         Ok(guard.remove(0))
@@ -235,6 +237,7 @@ fn text_response(text: &str) -> ChatResponse {
     ChatResponse {
         text: Some(text.into()),
         tool_calls: vec![],
+        usage: None,
     }
 }
 
@@ -242,6 +245,7 @@ fn tool_response(calls: Vec<ToolCall>) -> ChatResponse {
     ChatResponse {
         text: Some(String::new()),
         tool_calls: calls,
+        usage: None,
     }
 }
 
@@ -365,6 +369,7 @@ async fn e2e_xml_dispatcher_tool_call() {
                     .into(),
             ),
             tool_calls: vec![],
+            usage: None,
         },
         text_response("XML tool executed"),
     ]));
diff --git a/tests/agent_loop_robustness.rs b/tests/agent_loop_robustness.rs
index fadcd9f3b..aa642bbdd 100644
--- a/tests/agent_loop_robustness.rs
+++ b/tests/agent_loop_robustness.rs
@@ -59,6 +59,7 @@ impl Provider for MockProvider {
             return Ok(ChatResponse {
                 text: Some("done".into()),
                 tool_calls: vec![],
+                usage: None,
             });
         }
         Ok(guard.remove(0))
@@ -179,6 +180,7 @@ fn text_response(text: &str) -> ChatResponse {
     ChatResponse {
         text: Some(text.into()),
         tool_calls: vec![],
+        usage: None,
     }
 }
 
@@ -186,6 +188,7 @@ fn tool_response(calls: Vec<ToolCall>) -> ChatResponse {
     ChatResponse {
         text: Some(String::new()),
         tool_calls: calls,
+        usage: None,
     }
 }
 
@@ -353,6 +356,7 @@ async fn agent_handles_empty_provider_response() {
     let provider = Box::new(MockProvider::new(vec![ChatResponse {
         text: Some(String::new()),
         tool_calls: vec![],
+        usage: None,
     }]));
 
     let mut agent = build_agent(provider, vec![Box::new(EchoTool)]);
@@ -366,6 +370,7 @@ async fn agent_handles_none_text_response() {
     let provider = Box::new(MockProvider::new(vec![ChatResponse {
         text: None,
         tool_calls: vec![],
+        usage: None,
     }]));
 
     let mut agent = build_agent(provider, vec![Box::new(EchoTool)]);
diff --git a/tests/provider_schema.rs b/tests/provider_schema.rs
index 84e2c841f..30beb2447 100644
--- a/tests/provider_schema.rs
+++ b/tests/provider_schema.rs
@@ -153,6 +153,7 @@ fn chat_response_text_only() {
     let resp = ChatResponse {
         text: Some("Hello world".into()),
         tool_calls: vec![],
+        usage: None,
     };
 
     assert_eq!(resp.text_or_empty(), "Hello world");
@@ -168,6 +169,7 @@ fn chat_response_with_tool_calls() {
             name: "echo".into(),
             arguments: "{}".into(),
         }],
+        usage: None,
     };
 
     assert!(resp.has_tool_calls());
@@ -180,6 +182,7 @@ fn chat_response_text_or_empty_handles_none() {
     let resp = ChatResponse {
         text: None,
         tool_calls: vec![],
+        usage: None,
     };
 
     assert_eq!(resp.text_or_empty(), "");
@@ -201,6 +204,7 @@ fn chat_response_multiple_tool_calls() {
                 arguments: r#"{"path": "test.txt"}"#.into(),
             },
         ],
+        usage: None,
     };
 
     assert!(resp.has_tool_calls());