[agents]Improve some limits documentation

Author: vangarp

articles/ai-foundry/agents/concepts/threads-runs-messages.md

@@ -34,11 +34,11 @@ A custom AI that uses AI models in conjunction with tools.
 
 ## Threads
 
-Threads are conversation sessions between an agent and a user. They store messages and automatically handle truncation to fit content into a model’s context. When you create a thread, you can append new messages to it as users respond.
+Threads are conversation sessions between an agent and a user. They store messages and automatically handle truncation to fit content into a model’s context. When you create a thread, you can append new messages (maximum of 100,000 per thread) to it as users respond.
 
 ## Messages
 
-Messages are the individual pieces of communication within a thread. They can be created by either the agent or the user and can include text, or other files. Messages are stored as a list within the thread, allowing for a structured and organized conversation flow.
+Messages are the individual pieces of communication within a thread. They can be created by either the agent or the user and can include text, or other files. Messages are stored as a list within the thread, allowing for a structured and organized conversation flow. You can attach up to 100,000 messages to a single thread.
 
 ## Runs
 

articles/ai-foundry/agents/quotas-limits.md

@@ -21,10 +21,13 @@ The following sections provide you with a guide to the default quotas and limits
 
 | Limit Name | Limit Value |
 |--|--|
-| Max files per agent/thread | 10,000 |
-| Max file size for agents & fine-tuning | 512 MB |
-| Max size for all uploaded files for agents |200 GB |  
-| agents token limit | 2,000,000 token limit |
+| Maximum number of files per agent/thread | 10,000 |
+| Maximum file size for agents & fine-tuning | 512 MB |
+| Maximum size for all uploaded files for agents | 300 GB |
+| Maximum file size in tokens for attaching to a vector store | 2,000,000 tokens |
+| Maximum number of messages per thread | 100,000 |
+| Maximum size of `text` content per message | 1,500,000 characters |
+| Maximum number of tools registered per agent | 128 |
 
 ## Quotas and limits for Azure OpenAI models