Restructure usage section of README (#120)

* Restructure usage section of README

* Create separate Providers section and reorganize subheadings

* Remove now outdated note about Ollama not supporting guided generation

* Bump version to 0.7.0

Author: mattt

README.md

@@ -98,7 +98,7 @@ Add this package to your `Package.swift`:
 
 ```swift
 dependencies: [
-    .package(url: "https://github.com/mattt/AnyLanguageModel", from: "0.5.0")
+    .package(url: "https://github.com/mattt/AnyLanguageModel", from: "0.7.0")
 ]
 ```
 
@@ -126,7 +126,7 @@ To enable specific traits, specify them in your package's dependencies:
 dependencies: [
     .package(
         url: "https://github.com/mattt/AnyLanguageModel.git",
-        from: "0.5.0",
+        from: "0.7.0",
         traits: ["CoreML", "MLX"] // Enable CoreML and MLX support
     )
 ]
@@ -287,26 +287,14 @@ see OWASP's
 
 ## Usage
 
-### Apple Foundation Models
-
-Uses Apple's [system language model](https://developer.apple.com/documentation/FoundationModels)
-(requires macOS 26 / iOS 26 / visionOS 26 or later).
-
-```swift
-let model = SystemLanguageModel.default
-let session = LanguageModelSession(model: model)
+### Guided Generation
 
-let response = try await session.respond {
-    Prompt("Explain quantum computing in one sentence")
-}
-```
-
-> [!NOTE]
-> Image inputs are not yet supported by Apple Foundation Models.
-
-`SystemLanguageModel` supports guided generation,
+All on-device models — Apple Foundation Models, Core ML, MLX, and llama.cpp —
+support guided generation,
 letting you request strongly typed outputs using `@Generable` and `@Guide`
 instead of parsing raw strings.
+Cloud providers (OpenAI, Open Responses, Anthropic, and Gemini)
+also support guided generation.
 For more details, see
 [Generating Swift data structures with guided generation](https://developer.apple.com/documentation/foundationmodels/generating-swift-data-structures-with-guided-generation).
 
@@ -323,17 +311,125 @@ struct CatProfile {
     var profile: String
 }
 
-let session = LanguageModelSession(model: .default)
+let session = LanguageModelSession(model: model)
 let response = try await session.respond(
     to: "Generate a cute rescue cat",
     generating: CatProfile.self
 )
 print(response.content)
 ```
 
+### Image Inputs
+
+Many providers support image inputs,
+letting you include images alongside text prompts.
+Pass images using the `images:` or `image:` parameter on `respond`:
+
+```swift
+let response = try await session.respond(
+    to: "Describe what you see",
+    images: [
+        .init(url: URL(string: "https://example.com/photo.jpg")!),
+        .init(url: URL(fileURLWithPath: "/path/to/local.png"))
+    ]
+)
+```
+
+Image support varies by provider:
+
+| Provider                | Image Inputs    |
+| ----------------------- | :-------------: |
+| Apple Foundation Models | —               |
+| Core ML                 | —               |
+| MLX                     | model-dependent |
+| llama.cpp               | —               |
+| Ollama                  | model-dependent |
+| OpenAI                  | yes             |
+| Open Responses          | yes             |
+| Anthropic               | yes             |
+| Google Gemini           | yes             |
+
+For MLX and Ollama,
+use a vision-capable model 
+(for example, a VLM or `-vl` variant).
+
+### Tool Calling
+
+Tool calling is supported by all providers except llama.cpp.
+Define tools using the `Tool` protocol and pass them when creating a session:
+
+```swift
+struct WeatherTool: Tool {
+    let name = "getWeather"
+    let description = "Retrieve the latest weather information for a city"
+
+    @Generable
+    struct Arguments {
+        @Guide(description: "The city to fetch the weather for")
+        var city: String
+    }
+
+    func call(arguments: Arguments) async throws -> String {
+        "The weather in \(arguments.city) is sunny and 72°F / 23°C"
+    }
+}
+
+let session = LanguageModelSession(model: model, tools: [WeatherTool()])
+
+let response = try await session.respond {
+    Prompt("How's the weather in Cupertino?")
+}
+print(response.content)
+```
+
+To observe or control tool execution, assign a delegate on the session:
+
+```swift
+actor ToolExecutionObserver: ToolExecutionDelegate {
+    func didGenerateToolCalls(_ toolCalls: [Transcript.ToolCall], in session: LanguageModelSession) async {
+        print("Generated tool calls: \(toolCalls)")
+    }
+
+    func toolCallDecision(
+        for toolCall: Transcript.ToolCall,
+        in session: LanguageModelSession
+    ) async -> ToolExecutionDecision {
+        // Return .stop to halt after tool calls, or .provideOutput(...) to bypass execution.
+        // This is a good place to ask the user for confirmation (for example, in a modal dialog).
+        .execute
+    }
+
+    func didExecuteToolCall(
+        _ toolCall: Transcript.ToolCall,
+        output: Transcript.ToolOutput,
+        in session: LanguageModelSession
+    ) async {
+        print("Executed tool call: \(toolCall)")
+    }
+}
+
+session.toolExecutionDelegate = ToolExecutionObserver()
+```
+
+## Providers
+
+### Apple Foundation Models
+
+Uses Apple's [system language model](https://developer.apple.com/documentation/FoundationModels)
+(requires macOS 26 / iOS 26 / visionOS 26 or later).
+
+```swift
+let model = SystemLanguageModel.default
+let session = LanguageModelSession(model: model)
+
+let response = try await session.respond {
+    Prompt("Explain quantum computing in one sentence")
+}
+```
+
 ### Core ML
 
-Run [Core ML](https://developer.apple.com/documentation/coreml) models
+Runs [Core ML](https://developer.apple.com/documentation/coreml) models
 (requires `CoreML` trait):
 
 ```swift
@@ -355,12 +451,9 @@ Enable the trait in Package.swift:
 )
 ```
 
-> [!NOTE]
-> Image inputs are not currently supported with `CoreMLLanguageModel`.
-
 ### MLX
 
-Run [MLX](https://github.com/ml-explore/mlx-swift) models on Apple Silicon
+Runs [MLX](https://github.com/ml-explore/mlx-swift) models on Apple Silicon
 (requires `MLX` trait):
 
 ```swift
@@ -398,12 +491,9 @@ Enable the trait in Package.swift:
 )
 ```
 
-> [!NOTE]
-> MLX supports guided generation (structured output via `@Generable`).
-
 ### llama.cpp (GGUF)
 
-Run GGUF quantized models via [llama.cpp](https://github.com/ggml-org/llama.cpp)
+Runs GGUF quantized models via [llama.cpp](https://github.com/ggml-org/llama.cpp)
 (requires `Llama` trait):
 
 ```swift
@@ -451,9 +541,55 @@ let response = try await session.respond(
 )
 ```
 
-> [!NOTE]
-> Image inputs are not currently supported with `LlamaLanguageModel`.
-> Guided generation (structured output via `@Generable`) is supported.
+### Ollama
+
+Run models locally via Ollama's
+[HTTP API](https://github.com/ollama/ollama/blob/main/docs/api.md):
+
+```swift
+// Default: connects to http://localhost:11434
+let model = OllamaLanguageModel(model: "qwen3") // `ollama pull qwen3:8b`
+
+// Custom endpoint
+let model = OllamaLanguageModel(
+    endpoint: URL(string: "http://remote-server:11434")!,
+    model: "llama3.2"
+)
+
+let session = LanguageModelSession(model: model)
+let response = try await session.respond {
+    Prompt("Tell me a joke")
+}
+```
+
+For local models, make sure you're using a vision‑capable model
+(for example, a `-vl` variant).
+You can combine multiple images:
+
+```swift
+let model = OllamaLanguageModel(model: "qwen3-vl") // `ollama pull qwen3-vl:8b`
+let session = LanguageModelSession(model: model)
+let response = try await session.respond(
+    to: "Compare these posters and summarize their differences",
+    images: [
+        .init(url: URL(string: "https://example.com/poster1.jpg")!),
+        .init(url: URL(fileURLWithPath: "/path/to/poster2.jpg"))
+    ]
+)
+print(response.content)
+```
+
+Pass any model-specific parameters using custom generation options:
+
+```swift
+var options = GenerationOptions(temperature: 0.8)
+options[custom: OllamaLanguageModel.self] = [
+    "seed": .int(42),
+    "repeat_penalty": .double(1.2),
+    "num_ctx": .int(4096),
+    "stop": .array([.string("###")])
+]
+```
 
 ### OpenAI
 
@@ -512,28 +648,32 @@ options[custom: OpenAILanguageModel.self] = .init(
 
 ### Open Responses
 
-Connects to any API that conforms to the [Open Responses](https://www.openresponses.org) specification (e.g. OpenAI, OpenRouter, or other compatible providers). Base URL is required—use your provider’s endpoint:
+Connects to any API that conforms to the 
+[Open Responses](https://www.openresponses.org) specification 
+(e.g. OpenAI, OpenRouter, or other compatible providers). 
+Base URL is required—use your provider’s endpoint:
 
 ```swift
-// Example: OpenAI
+// Example: OpenRouter (https://openrouter.ai/api/v1/)
 let model = OpenResponsesLanguageModel(
-    baseURL: URL(string: "https://api.openai.com/v1/")!,
+    baseURL: URL(string: "https://openrouter.ai/api/v1/")!,
     apiKey: ProcessInfo.processInfo.environment["OPEN_RESPONSES_API_KEY"]!,
-    model: "gpt-4o-mini"
+    model: "openai/gpt-4o-mini"
 )
 
-// Example: OpenRouter (https://openrouter.ai/api/v1/)
+// Example: OpenAI
 let model = OpenResponsesLanguageModel(
-    baseURL: URL(string: "https://openrouter.ai/api/v1/")!,
+    baseURL: URL(string: "https://api.openai.com/v1/")!,
     apiKey: ProcessInfo.processInfo.environment["OPEN_RESPONSES_API_KEY"]!,
-    model: "openai/gpt-4o-mini"
+    model: "gpt-4o-mini"
 )
 
 let session = LanguageModelSession(model: model)
 let response = try await session.respond(to: "Say hello")
 ```
 
-Custom options support Open Responses–specific fields such as `tool_choice` (including `allowed_tools`) and `extraBody`:
+Custom options support Open Responses–specific fields,
+such as `tool_choice` (including `allowed_tools`) and `extraBody`:
 
 ```swift
 var options = GenerationOptions(temperature: 0.8)
@@ -667,56 +807,6 @@ let response = try await session.respond(
 > [!TIP]
 > Gemini server tools are not available as client tools (`Tool`) for other models.
 
-### Ollama
-
-Run models locally via Ollama's
-[HTTP API](https://github.com/ollama/ollama/blob/main/docs/api.md):
-
-```swift
-// Default: connects to http://localhost:11434
-let model = OllamaLanguageModel(model: "qwen3") // `ollama pull qwen3:8b`
-
-// Custom endpoint
-let model = OllamaLanguageModel(
-    endpoint: URL(string: "http://remote-server:11434")!,
-    model: "llama3.2"
-)
-
-let session = LanguageModelSession(model: model)
-let response = try await session.respond {
-    Prompt("Tell me a joke")
-}
-```
-
-For local models, make sure you're using a vision‑capable model
-(for example, a `-vl` variant).
-You can combine multiple images:
-
-```swift
-let model = OllamaLanguageModel(model: "qwen3-vl") // `ollama pull qwen3-vl:8b`
-let session = LanguageModelSession(model: model)
-let response = try await session.respond(
-    to: "Compare these posters and summarize their differences",
-    images: [
-        .init(url: URL(string: "https://example.com/poster1.jpg")!),
-        .init(url: URL(fileURLWithPath: "/path/to/poster2.jpg"))
-    ]
-)
-print(response.content)
-```
-
-Pass any model-specific parameters using custom generation options:
-
-```swift
-var options = GenerationOptions(temperature: 0.8)
-options[custom: OllamaLanguageModel.self] = [
-    "seed": .int(42),
-    "repeat_penalty": .double(1.2),
-    "num_ctx": .int(4096),
-    "stop": .array([.string("###")])
-]
-```
-
 ## Testing
 
 Run the test suite to verify everything works correctly: