diff --git a/sdk/arch/agent-server.mdx b/sdk/arch/agent-server.mdx
index 12259896..775a6e12 100644
--- a/sdk/arch/agent-server.mdx
+++ b/sdk/arch/agent-server.mdx
@@ -123,6 +123,27 @@ conversation.close()
 
 If the server was started without `OH_SESSION_API_KEYS_0`, remove the `api_key=...` argument.
 
+## Customize Conversation Title Generation
+
+When creating a conversation through `POST /api/conversations`, set
+`prompt` to replace the default user prompt used for automatic
+title generation. The value can contain these placeholders:
+
+- `{conversation_content}` - The first user message, truncated to 1,000 characters.
+- `{max_length}` - The maximum generated title length.
+
+```json
+{
+  "autotitle": true,
+  "prompt": "Create a title under {max_length} characters for: {conversation_content}"
+}
+```
+
+If `{conversation_content}` is not present, the Agent Server appends the first
+user message to the custom prompt. Empty or omitted values keep the default
+title-generation behavior. Prompts can contain up to 2,000 characters and are
+stored with the conversation in `meta.json`.
+
 ## Expose It Safely
 
 If another service runs on the same machine, keep the server bound to `127.0.0.1` and let that service connect locally.