diff --git a/keyserver/src/responders/relationship-responders.js b/keyserver/src/responders/relationship-responders.js
--- a/keyserver/src/responders/relationship-responders.js
+++ b/keyserver/src/responders/relationship-responders.js
@@ -10,8 +10,9 @@
   legacyFarcasterRelationshipRequestValidator,
   relationshipActions,
   type RelationshipRequestUserInfo,
+  type RelationshipRequestWithRobotext,
+  type RelationshipRequestWithoutRobotext,
   type RelationshipRequest,
-  relationshipActionsList,
 } from 'lib/types/relationship-types.js';
 import { tShape, tUserID } from 'lib/utils/validation-utils.js';
 
@@ -54,23 +55,40 @@
       createRobotextInThinThread: true,
     };
   }
-  const request = {
-    action: legacyRequest.action,
-    users: requestUserInfos,
-  };
+  const { action } = legacyRequest;
+  let request: RelationshipRequest;
+  if (action === 'farcaster' || action === 'friend') {
+    request = { action, users: requestUserInfos };
+  } else {
+    request = { action, users: requestUserInfos };
+  }
   return await updateRelationships(viewer, request);
 }
 
-export const updateRelationshipInputValidator: TInterface<RelationshipRequest> =
-  tShape<RelationshipRequest>({
-    action: t.enums.of(relationshipActionsList, 'relationship action'),
-    users: t.dict(
-      tUserID,
-      tShape<RelationshipRequestUserInfo>({
-        createRobotextInThinThread: t.Boolean,
-      }),
-    ),
-  });
+export const updateRelationshipInputValidator: TUnion<RelationshipRequest> =
+  t.union([
+    tShape<RelationshipRequestWithRobotext>({
+      action: t.enums.of(['farcaster', 'friend'], 'relationship action'),
+      users: t.dict(
+        tUserID,
+        tShape<RelationshipRequestUserInfo>({
+          createRobotextInThinThread: t.Boolean,
+        }),
+      ),
+    }),
+    tShape<RelationshipRequestWithoutRobotext>({
+      action: t.enums.of(
+        ['unfriend', 'block', 'unblock', 'acknowledge'],
+        'relationship action',
+      ),
+      users: t.dict(
+        tUserID,
+        tShape<RelationshipRequestUserInfo>({
+          createRobotextInThinThread: t.maybe(t.Boolean),
+        }),
+      ),
+    }),
+  ]);
 
 async function updateRelationshipsResponder(
   viewer: Viewer,
diff --git a/lib/hooks/relationship-hooks.js b/lib/hooks/relationship-hooks.js
--- a/lib/hooks/relationship-hooks.js
+++ b/lib/hooks/relationship-hooks.js
@@ -21,6 +21,7 @@
   type RelationshipAction,
   type RelationshipErrors,
   type RelationshipRequestUserInfo,
+  type RelationshipRequest,
   relationshipActions,
   userRelationshipStatus,
 } from '../types/relationship-types.js';
@@ -172,10 +173,14 @@
             planForUser.plan === 'send_to_thin_thread',
         };
       }
-      const keyserverResultPromise = updateRelationships({
-        action,
-        users: usersForKeyserverCall,
-      });
+
+      let request: RelationshipRequest;
+      if (action === 'farcaster' || action === 'friend') {
+        request = { action, users: usersForKeyserverCall };
+      } else {
+        request = { action, users: usersForKeyserverCall };
+      }
+      const keyserverResultPromise = updateRelationships(request);
 
       const thickThreadPromises: Array<Promise<void>> = [];
       for (const [userID, planForUser] of planForUsers) {
@@ -286,18 +291,22 @@
         (action !== relationshipActions.FRIEND &&
           action !== relationshipActions.FARCASTER_MUTUAL)
       ) {
-        return await updateRelationships({
-          action,
-          users: Object.fromEntries(
+        let request: RelationshipRequest;
+        if (action === 'farcaster' || action === 'friend') {
+          const users = Object.fromEntries(
             userIDs.map(userID => [
               userID,
               {
-                // this param only matters for FRIEND and FARCASTER_MUTUAL
                 createRobotextInThinThread: true,
               },
             ]),
-          ),
-        });
+          );
+          request = { action, users };
+        } else {
+          const users = Object.fromEntries(userIDs.map(userID => [userID, {}]));
+          request = { action, users };
+        }
+        return await updateRelationships(request);
       }
 
       const missingDeviceListsUserIDs: Array<string> = [];
diff --git a/lib/types/relationship-types.js b/lib/types/relationship-types.js
--- a/lib/types/relationship-types.js
+++ b/lib/types/relationship-types.js
@@ -92,10 +92,17 @@
 export type RelationshipRequestUserInfo = {
   +createRobotextInThinThread: boolean,
 };
-export type RelationshipRequest = {
-  +action: RelationshipAction,
+export type RelationshipRequestWithRobotext = {
+  +action: 'farcaster' | 'friend',
   +users: { +[userID: string]: RelationshipRequestUserInfo },
 };
+export type RelationshipRequestWithoutRobotext = {
+  +action: 'unfriend' | 'block' | 'unblock' | 'acknowledge',
+  +users: { +[userID: string]: $Partial<RelationshipRequestUserInfo> },
+};
+export type RelationshipRequest =
+  | RelationshipRequestWithRobotext
+  | RelationshipRequestWithoutRobotext;
 
 export const legacyFarcasterRelationshipRequestValidator: TInterface<LegacyFarcasterRelationshipRequest> =
   tShape<LegacyFarcasterRelationshipRequest>({