[CHORE] Update readme with agent features

packages/llmpane-py/README.md

@@ -2,6 +2,14 @@
 
 A lightweight, embeddable chat UI component for Python/FastAPI backends serving LLM features.
 
+## Features
+
+- **Pydantic AI integration** — `ChatSession` wraps any Pydantic AI agent with conversation persistence and streaming
+- **Tool calling support** — Automatic tool execution with status streaming to the frontend
+- **Conversation persistence** — Pluggable stores (in-memory, Redis, SQL) for multi-turn conversations
+- **Multimodal support** — Send images alongside text for vision-capable models
+- **Type-safe streaming** — Pydantic models for requests, responses, and SSE chunks
+
 ## Installation
 
 ```bash
@@ -10,8 +18,11 @@ uv add llmpane
 # With FastAPI support
 uv add llmpane[fastapi]
 
+# With Pydantic AI agent support
+uv add llmpane[fastapi,agent]
+
 # Or with pip
-pip install llmpane[fastapi]
+pip install llmpane[fastapi,agent]
 ```
 
 ## Quick Start
@@ -131,6 +142,75 @@ async def chat(request: ChatRequest):
     )
 ```
 
+## Pydantic AI Agents
+
+The `agent` extra provides deep integration with [Pydantic AI](https://ai.pydantic.dev/):
+
+```bash
+uv add llmpane[fastapi,agent]
+```
+
+### ChatSession
+
+`ChatSession` combines a Pydantic AI agent with conversation persistence:
+
+```python
+from pydantic_ai import Agent
+from llmpane import ChatRequest, create_sse_response
+from llmpane.agent import ChatSession
+
+agent = Agent(
+    "anthropic:claude-sonnet-4-20250514",
+    system_prompt="You are a helpful assistant.",
+)
+
+# Tools are defined on the agent as usual
+@agent.tool_plain
+def get_weather(city: str) -> str:
+    """Get the current weather for a city."""
+    return f"Sunny, 72°F in {city}"
+
+session = ChatSession(agent=agent)
+
+@app.post("/chat")
+async def chat(request: ChatRequest):
+    # Handles persistence, tool execution, and streaming automatically
+    return create_sse_response(
+        session.run(request.conversation_id, request.message)
+    )
+```
+
+### Conversation Stores
+
+Conversations are persisted automatically. The default is in-memory, but you can use Redis or SQL:
+
+```python
+from llmpane.store import create_store
+
+# In-memory (default)
+store = create_store("memory", max_conversations=1000)
+
+# Redis
+store = create_store("redis", url="redis://localhost:6379")
+
+# SQLite/PostgreSQL
+store = create_store("sql", url="sqlite+aiosqlite:///chats.db")
+
+session = ChatSession(agent=agent, store=store)
+```
+
+### Tool Call Streaming
+
+When the agent calls tools, llmpane streams `ToolUseMetadata` to the frontend so you can show pending/completed states:
+
+```python
+from llmpane.agent import ToolUseMetadata, ToolStatus
+
+# Streamed automatically during agent execution:
+# {"metadata": {"tools": [{"name": "get_weather", "status": "pending"}]}}
+# {"metadata": {"tools": [{"name": "get_weather", "status": "completed", "result": "Sunny..."}]}}
+```
+
 ## Custom Metadata
 
 Use generics to add type-safe custom metadata: