diff --git a/README.md b/README.md
index 1ab14fa..063b7ba 100644
--- a/README.md
+++ b/README.md
@@ -90,7 +90,20 @@ client.chat(
 )
 ```
 
+Once the function is called, results are passed through `tool_results` array so you can get insights on the next reply.
 
+```ruby
+client.chat(
+  model: model,
+  message: message,
+  tools: tool,
+  tool_results: [
+    {
+      rows: [['Ruby', 42]]
+    }
+  ]
+)
+```
 
 ### Embed
 
diff --git a/lib/cohere/client.rb b/lib/cohere/client.rb
index ed5b2a4..7d1b2fd 100644
--- a/lib/cohere/client.rb
+++ b/lib/cohere/client.rb
@@ -19,7 +19,7 @@ def chat(
       stream: false,
       preamble: nil,
       preamble_override: nil,
-      chat_history: [],
+      chat_history: nil,
       conversation_id: nil,
       prompt_truncation: nil,
       connectors: [],
@@ -34,6 +34,8 @@ def chat(
       frequency_penalty: nil,
       presence_penalty: nil,
       tools: [],
+      tool_results: nil,
+      force_single_step: true, # default to true for backwards compatibility prior 6/10/2024 change
       &block
     )
       response = connection.post("chat") do |req|
@@ -62,6 +64,8 @@ def chat(
         req.body[:frequency_penalty] = frequency_penalty if frequency_penalty
         req.body[:presence_penalty] = presence_penalty if presence_penalty
         req.body[:tools] = tools if tools
+        req.body[:tool_results] = tool_results if tool_results
+        req.body[:force_single_step] = force_single_step
       end
       response.body
     end
@@ -119,6 +123,26 @@ def embed(
       response.body
     end
 
+    def rerank(
+      query:,
+      documents: [],
+      top_n: nil,
+      rank_fields: nil,
+      return_documents: nil,
+      max_chunks_per_doc: nil,
+      model: nil
+    )
+      response = connection.post("rerank") do |req|
+        req.body = { query:, documents: }
+        req.body[:top_n] = top_n if top_n
+        req.body[:rank_fields] = rank_fields if rank_fields
+        req.body[:return_documents] = return_documents if return_documents
+        req.body[:max_chunks_per_doc] = max_chunks_per_doc if max_chunks_per_doc
+        req.body[:model] = model if model
+      end
+      response.body
+    end
+
     def classify(
       inputs:,
       examples:,