diff --git a/src/grom.gleam b/src/grom.gleam
index 346d477..e069b9a 100644
--- a/src/grom.gleam
+++ b/src/grom.gleam
@@ -12843,3 +12843,87 @@ fn create_container_component_to_json(
     CreateContainerFile(file) -> create_message_file_to_json(file)
   }
 }
+
+/// The thread mustn't be archived.
+pub fn join_thread_request(
+  token token: Token,
+  thread_with_id id: Snowflake(Thread),
+) -> Request(String) {
+  new_request(
+    token:,
+    to: "/channels/" <> snowflake_to_string(id) <> "/thread-members/@me",
+    method: http.Put,
+  )
+}
+
+pub fn join_thread_response(
+  response: Response(String),
+) -> Result(Nil, RestError) {
+  handle_no_content_response(response)
+}
+
+/// The thread mustn't be archived.
+///
+/// Requires the ability to send messages in the thread.
+pub fn add_member_to_thread_request(
+  token token: Token,
+  thread_with_id thread_id: Snowflake(Thread),
+  member_with_id member_id: Snowflake(User),
+) -> Request(String) {
+  new_request(
+    token:,
+    to: "/channels/"
+      <> snowflake_to_string(thread_id)
+      <> "/thread-members/"
+      <> snowflake_to_string(member_id),
+    method: http.Put,
+  )
+}
+
+pub fn add_member_to_thread_response(
+  response: Response(String),
+) -> Result(Nil, RestError) {
+  handle_no_content_response(response)
+}
+
+/// The thread mustn't be archived.
+pub fn leave_thread_request(
+  token token: Token,
+  thread_with_id id: Snowflake(Thread),
+) -> Request(String) {
+  new_request(
+    token:,
+    to: "/channels/" <> snowflake_to_string(id) <> "/thread-members/@me",
+    method: http.Delete,
+  )
+}
+
+pub fn leave_thread_response(
+  response: Response(String),
+) -> Result(Nil, RestError) {
+  handle_no_content_response(response)
+}
+
+/// The thread mustn't be archived.
+///
+/// Requires the `AllowManagingThreads` permission or the current user to be the thread's creator if it's a private thread.
+pub fn remove_member_from_thread(
+  token token: Token,
+  thread_with_id thread_id: Snowflake(Thread),
+  member_with_id member_id: Snowflake(User),
+) -> Request(String) {
+  new_request(
+    token:,
+    to: "/channels/"
+      <> snowflake_to_string(thread_id)
+      <> "/thread-members/"
+      <> snowflake_to_string(member_id),
+    method: http.Delete,
+  )
+}
+
+pub fn remove_member_from_thread_response(
+  response: Response(String),
+) -> Result(Nil, RestError) {
+  handle_no_content_response(response)
+}