docs: assistant improvements (#725)

Author: stainless-bot

Diff for: README.md

@@ -100,6 +100,37 @@ Documentation for each method, request param, and response field are available i
 > [!IMPORTANT]
 > Previous versions of this SDK used a `Configuration` class. See the [v3 to v4 migration guide](https://github.com/openai/openai-node/discussions/217).
 
+### Streaming Helpers
+
+The SDK also includes helpers to process streams and handle the incoming events.
+
+```ts
+const run = openai.beta.threads.runs
+  .createAndStream(thread.id, {
+    assistant_id: assistant.id,
+  })
+  .on('textCreated', (text) => process.stdout.write('\nassistant > '))
+  .on('textDelta', (textDelta, snapshot) => process.stdout.write(textDelta.value))
+  .on('toolCallCreated', (toolCall) => process.stdout.write(`\nassistant > ${toolCall.type}\n\n`))
+  .on('toolCallDelta', (toolCallDelta, snapshot) => {
+    if (toolCallDelta.type === 'code_interpreter') {
+      if (toolCallDelta.code_interpreter.input) {
+        process.stdout.write(toolCallDelta.code_interpreter.input);
+      }
+      if (toolCallDelta.code_interpreter.outputs) {
+        process.stdout.write('\noutput >\n');
+        toolCallDelta.code_interpreter.outputs.forEach((output) => {
+          if (output.type === 'logs') {
+            process.stdout.write(`\n${output.logs}\n`);
+          }
+        });
+      }
+    }
+  });
+```
+
+More information on streaming helpers can be found in the dedicated documentation: [helpers.md](helpers.md)
+
 ### Streaming responses
 
 This library provides several conveniences for streaming chat completions, for example:

Diff for: helpers.md

@@ -36,6 +36,29 @@ const run = openai.beta.threads.runs
   });
 ```
 
+### Starting a stream
+
+There are three helper methods for creating streams:
+
+```ts
+openai.beta.threads.runs.createAndStream();
+```
+
+This method can be used to start and stream the response to an existing run with an associated thread
+that is already populated with messages.
+
+```ts
+openai.beta.threads.createAndRunStream();
+```
+
+This method can be used to add a message to a thread, start a run and then stream the response.
+
+```ts
+openai.beta.threads.runs.submitToolOutputsStream();
+```
+
+This method can be used to submit a tool output to a run waiting on the output and start a stream.
+
 ### Assistant Events
 
 The assistant API provides events you can subscribe to for the following events.
@@ -108,25 +131,25 @@ The last event send when a stream ends.
 The assistant streaming object also provides a few methods for convenience:
 
 ```ts
-.currentEvent()
+.currentEvent(): AssistantStreamEvent | undefined
 
-.currentRun()
+.currentRun(): Run | undefined
 
-.currentMessageSnapshot()
+.currentMessageSnapshot(): Message
 
-.currentRunStepSnapshot()
+.currentRunStepSnapshot(): Runs.RunStep
 ```
 
 These methods are provided to allow you to access additional context from within event handlers. In many cases
 the handlers should include all the information you need for processing, but if additional context is required it
 can be accessed.
 
-Note: There is not always a relevant context in certain situations (these will be undefined in those cases).
+Note: There is not always a relevant context in certain situations (these will be `undefined` in those cases).
 
 ```ts
-await.finalMessages();
+await .finalMessages() : Promise<Message[]>
 
-await.finalRunSteps();
+await .finalRunSteps(): Promise<RunStep[]>
 ```
 
 These methods are provided for convenience to collect information at the end of a stream. Calling these events