add notes about batches development status to docs

this also captures other notes from agents, eval and inference apis

docs/source/providers/agents/index.md

@@ -2,6 +2,15 @@
 
 ## Overview
 
+Agents API for creating and interacting with agentic systems.
+
+    Main functionalities provided by this API:
+    - Create agents with specific instructions and ability to use tools.
+    - Interactions with agents are grouped into sessions ("threads"), and each interaction is called a "turn".
+    - Agents can be provided with various tools (see the ToolGroups and ToolRuntime APIs for more details).
+    - Agents can be provided with various shields (see the Safety API for more details).
+    - Agents can also use Memory to retrieve information from knowledge bases. See the RAG Tool and Vector IO APIs for more details.
+
 This section contains documentation for all available providers for the **agents** API.
 
 ## Providers

docs/source/providers/batches/index.md

@@ -2,6 +2,14 @@
 
 ## Overview
 
+Protocol for batch processing API operations.
+
+    The Batches API enables efficient processing of multiple requests in a single operation,
+    particularly useful for processing large datasets, batch evaluation workflows, and
+    cost-effective inference at scale.
+
+    Note: This API is currently under active development and may undergo changes.
+
 This section contains documentation for all available providers for the **batches** API.
 
 ## Providers

docs/source/providers/eval/index.md

@@ -2,6 +2,8 @@
 
 ## Overview
 
+Llama Stack Evaluation API for running evaluations on model and agent candidates.
+
 This section contains documentation for all available providers for the **eval** API.
 
 ## Providers

docs/source/providers/inference/index.md

@@ -2,6 +2,12 @@
 
 ## Overview
 
+Llama Stack Inference API for generating completions, chat completions, and embeddings.
+
+    This API provides the raw interface to the underlying models. Two kinds of models are supported:
+    - LLM models: these models generate "raw" and "chat" (conversational) completions.
+    - Embedding models: these models generate embeddings to be used for semantic search.
+
 This section contains documentation for all available providers for the **inference** API.
 
 ## Providers