init README for claude Agent SDK

cookbook/anthropic_agent_sdk/README.md

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+# Claude Agent SDK with LiteLLM Gateway
+
+A simple example showing how to use Claude's Agent SDK with LiteLLM as a proxy. This lets you use any LLM provider (OpenAI, Bedrock, Azure, etc.) through the Agent SDK.
+
+## Quick Start
+
+### 1. Install dependencies
+
+```bash
+pip install anthropic claude-agent-sdk litellm
+```
+
+### 2. Start LiteLLM proxy
+
+```bash
+# Simple start with Claude
+litellm --model claude-sonnet-4-20250514
+
+# Or with a config file
+litellm --config config.yaml
+```
+
+### 3. Run the chat
+
+```bash
+python main.py
+```
+
+That's it! You can now chat with the agent in your terminal.
+
+## Configuration
+
+Set these environment variables if needed:
+
+```bash
+export LITELLM_PROXY_URL="http://localhost:4000"
+export LITELLM_API_KEY="sk-1234"
+export LITELLM_MODEL="claude-sonnet-4-20250514"
+```
+
+Or just use the defaults - it'll connect to `http://localhost:4000` by default.
+
+## Example Config File
+
+If you want to use multiple models, create a `config.yaml` (see `config.example.yaml`):
+
+```yaml
+model_list:
+  - model_name: bedrock-claude-sonnet-4
+    litellm_params:
+      model: "bedrock/us.anthropic.claude-sonnet-4-20250514-v1:0"
+      aws_region_name: "us-east-1"
+
+  - model_name: bedrock-claude-sonnet-4.5
+    litellm_params:
+      model: "bedrock/us.anthropic.claude-sonnet-4-5-20250929-v1:0"
+      aws_region_name: "us-east-1"
+```
+
+Then start LiteLLM with: `litellm --config config.yaml`
+
+## How It Works
+
+The key is pointing the Agent SDK to LiteLLM instead of directly to Anthropic:
+
+```python
+# Point to LiteLLM gateway (not Anthropic)
+os.environ["ANTHROPIC_BASE_URL"] = "http://localhost:4000"
+os.environ["ANTHROPIC_API_KEY"] = "sk-1234"  # Your LiteLLM key
+
+# Use any model configured in LiteLLM
+options = ClaudeAgentOptions(
+    model="bedrock-claude-sonnet-4",  # or gpt-4, or anything else
+    system_prompt="You are a helpful assistant.",
+    max_turns=50,
+)
+```
+
+Note: Don't add `/anthropic` to the base URL - LiteLLM handles the routing automatically.
+
+## Why Use This?
+
+- **Switch providers easily**: Use the same code with OpenAI, Bedrock, Azure, etc.
+- **Cost tracking**: LiteLLM tracks spending across all your agent conversations
+- **Rate limiting**: Set budgets and limits on your agent usage
+- **Load balancing**: Distribute requests across multiple API keys or regions
+- **Fallbacks**: Automatically retry with a different model if one fails
+
+## Troubleshooting
+
+**Connection errors?**
+- Make sure LiteLLM is running: `litellm --model your-model`
+- Check the URL is correct (default: `http://localhost:4000`)
+
+**Authentication errors?**
+- Verify your LiteLLM API key is correct
+- Make sure the model is configured in your LiteLLM setup
+
+**Model not found?**
+- Check the model name matches what's in your LiteLLM config
+- Run `litellm --model your-model` to test it works
+
+## Learn More
+
+- [LiteLLM Docs](https://docs.litellm.ai/)
+- [Claude Agent SDK](https://github.com/anthropics/anthropic-agent-sdk)
+- [LiteLLM Proxy Guide](https://docs.litellm.ai/docs/proxy/quick_start)

cookbook/anthropic_agent_sdk/config.example.yaml

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+model_list:
+  - model_name: bedrock-claude-sonnet-3.5
+    litellm_params:
+      model: "bedrock/us.anthropic.claude-3-5-sonnet-20240620-v1:0"
+      aws_region_name: "us-east-1"
+
+  - model_name: bedrock-claude-sonnet-4
+    litellm_params:
+      model: "bedrock/us.anthropic.claude-sonnet-4-20250514-v1:0"
+      aws_region_name: "us-east-1"
+
+  - model_name: bedrock-claude-sonnet-4.5
+    litellm_params:
+      model: "bedrock/us.anthropic.claude-sonnet-4-5-20250929-v1:0"
+      aws_region_name: "us-east-1"
+
+  - model_name: bedrock-claude-opus-4.5
+    litellm_params:
+      model: "bedrock/us.anthropic.claude-opus-4-5-20251101-v1:0"
+      aws_region_name: "us-east-1"
+
+  - model_name: bedrock-nova-premier
+    litellm_params:
+      model: "bedrock/amazon.nova-premier-v1:0"
+      aws_region_name: "us-east-1"