diff --git a/bobbin/crates/xrpc/src/lib.rs b/bobbin/crates/xrpc/src/lib.rs
index 96f50bd2d..d23135119 100644
--- a/bobbin/crates/xrpc/src/lib.rs
+++ b/bobbin/crates/xrpc/src/lib.rs
@@ -1019,6 +1019,19 @@ struct RecordView<V> {
     value: V,
 }
 
+#[derive(Serialize)]
+#[serde(rename_all = "camelCase")]
+struct CollaboratorListItem {
+    subject: Did<DefaultStr>,
+    added_by: Did<DefaultStr>,
+    created_at: Datetime,
+    effective_since: Datetime,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    uri: Option<AtUri<DefaultStr>>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    cid: Option<Cid<DefaultStr>>,
+}
+
 #[derive(Serialize)]
 #[serde(rename_all = "camelCase")]
 struct StatefulItem<V> {
@@ -2105,6 +2118,44 @@ where
     ))
 }
 
+fn collaborator_list_item(
+    view: RecordView<Collaborator<DefaultStr>>,
+) -> Result<Option<CollaboratorListItem>, XrpcError> {
+    let RecordView { uri, cid, value } = view;
+    let Some(added_by) = source_authority_did(&uri) else {
+        return Ok(None);
+    };
+    Ok(Some(CollaboratorListItem {
+        subject: value.subject,
+        added_by,
+        created_at: value.created_at.clone(),
+        effective_since: value.created_at,
+        uri: Some(uri),
+        cid,
+    }))
+}
+
+fn collaborator_list_response(
+    state: &AppState,
+    page: EdgePage,
+    nsid: Nsid<DefaultStr>,
+) -> Result<Response, XrpcError> {
+    let permit = state.heavy_permit()?;
+    let views = hydrate_record_stream::<Collaborator<DefaultStr>>(
+        state,
+        nsid,
+        page.items,
+        HitProvenance::Indexed,
+    )
+    .try_filter_map(|view| async move { collaborator_list_item(view) });
+    Ok(json_stream::<CollaboratorListItem, _>(
+        "items",
+        views,
+        paged_tail(page.next.map(PageToken::encode_token), page.total),
+        permit,
+    ))
+}
+
 async fn list_records<R, V, F>(
     state: &AppState,
     q: TypedListQuery<F>,
@@ -2380,7 +2431,8 @@ async fn list_collaborators(
     State(state): State<AppState>,
     XrpcQuery(q): XrpcQuery<TypedListQuery<NoFilter>>,
 ) -> Result<Response, XrpcError> {
-    list_records::<CollaboratorRecord, Collaborator<DefaultStr>, _>(&state, q).await
+    let (page, nsid) = record_edge_page::<CollaboratorRecord, NoFilter>(&state, &q)?;
+    collaborator_list_response(&state, page, nsid)
 }
 
 async fn count_collaborators(
@@ -3047,7 +3099,8 @@ async fn list_collaborators_by(
     State(state): State<AppState>,
     XrpcQuery(q): XrpcQuery<TypedListQuery<NoFilter>>,
 ) -> Result<Response, XrpcError> {
-    list_mirror::<CollaboratorBy, Collaborator<DefaultStr>, _>(&state, q).await
+    let (page, nsid) = mirror_edge_page::<CollaboratorBy, NoFilter>(&state, &q)?;
+    collaborator_list_response(&state, page, nsid)
 }
 async fn count_collaborators_by(
     State(state): State<AppState>,
diff --git a/bobbin/crates/xrpc/tests/aggregation.rs b/bobbin/crates/xrpc/tests/aggregation.rs
index 582a958d7..06ec7ae69 100644
--- a/bobbin/crates/xrpc/tests/aggregation.rs
+++ b/bobbin/crates/xrpc/tests/aggregation.rs
@@ -3271,8 +3271,14 @@ async fn knot_owned_collaborator_is_synthesized_without_slingshot() {
     assert_eq!(items.len(), 1);
     assert_eq!(items[0]["uri"], json!(source.as_ref()));
     assert!(items[0].get("cid").is_none());
-    assert_eq!(items[0]["value"]["repo"], json!("did:plc:scallop"));
-    assert_eq!(items[0]["value"]["subject"], json!("did:plc:olaren"));
+    assert_eq!(items[0]["subject"], json!("did:plc:olaren"));
+    assert_eq!(items[0]["addedBy"], json!("did:plc:scallop"));
+    assert_eq!(items[0]["createdAt"], items[0]["effectiveSince"]);
+    assert!(
+        items[0]["effectiveSince"]
+            .as_str()
+            .is_some_and(|at| at.starts_with("2026-06-03T12:00"))
+    );
 }
 
 #[tokio::test]
@@ -3304,8 +3310,14 @@ async fn knot_owned_collaborator_lists_by_subject_did() {
     assert_eq!(items.len(), 1);
     assert_eq!(items[0]["uri"], json!(source.as_ref()));
     assert!(items[0].get("cid").is_none());
-    assert_eq!(items[0]["value"]["repo"], json!("did:plc:scallop"));
-    assert_eq!(items[0]["value"]["subject"], json!("did:plc:olaren"));
+    assert_eq!(items[0]["subject"], json!("did:plc:olaren"));
+    assert_eq!(items[0]["addedBy"], json!("did:plc:scallop"));
+    assert_eq!(items[0]["createdAt"], items[0]["effectiveSince"]);
+    assert!(
+        items[0]["effectiveSince"]
+            .as_str()
+            .is_some_and(|at| at.starts_with("2026-06-03T12:00"))
+    );
 }
 
 #[tokio::test]