diff --git a/lib/components/fabro-llm/src/client.rs b/lib/components/fabro-llm/src/client.rs
index d0e5e2927..412456ffb 100644
--- a/lib/components/fabro-llm/src/client.rs
+++ b/lib/components/fabro-llm/src/client.rs
@@ -16,6 +16,10 @@ use lithos_llm::types::Error;
 use crate::attachments::InlineLocalAttachments;
 use crate::error::LlmError;
 
+/// The application name lithos reports to providers that ask, such as the
+/// `originator` header on the OpenAI Codex deployment.
+const APPLICATION_NAME: &str = "fabro";
+
 /// Default same-provider retry policy applied before visible output.
 ///
 /// Three attempts with short exponential backoff, capped at five seconds.
@@ -205,6 +209,7 @@ pub async fn build_client(
     }
     let builder = Client::builder()
         .catalog(catalog)
+        .application(APPLICATION_NAME)
         .credentials_arc(lithos_credentials(source))
         .enabled_providers(ready.iter().cloned());
     let build = options.apply(builder).build()?;
@@ -226,6 +231,7 @@ pub fn build_offline_client(
     let ready: Vec<ProviderId> = options.adapter_providers().cloned().collect();
     let builder = Client::builder()
         .catalog(catalog)
+        .application(APPLICATION_NAME)
         .enabled_providers(ready.iter().cloned());
     let build = options.apply(builder).build()?;
     Ok(FabroClient {