Refactor the Effect AI SDKs

.changeset/neat-melons-care.md

@@ -0,0 +1,247 @@
+---
+"@effect/ai-amazon-bedrock": minor
+"@effect/ai-anthropic": minor
+"@effect/ai-google": minor
+"@effect/ai-openai": minor
+"@effect/ai": minor
+---
+
+Refactor the Effect AI SDK and associated provider packages
+
+This pull request contains a complete refactor of the base Effect AI SDK package
+as well as the associated provider integration packages to improve flexibility
+and enhance ergonomics. Major changes are outlined below.
+
+## Modules
+
+All modules in the base Effect AI SDK have had the leading `Ai` prefix dropped
+from their name (except for the `AiError` module).
+
+For example, the `AiLanguageModel` module is now the `LanguageModel` module.
+
+In addition, the `AiInput` module has been renamed to the `Prompt` module.
+
+## Prompts
+
+The `Prompt` module has been completely redesigned with flexibility in mind.
+
+The `Prompt` module now supports building a prompt using either the constructors
+exposed from the `Prompt` module, or using raw prompt content parts / messages, 
+which should be familiar to those coming from other AI SDKs. 
+
+In addition, the `system` option has been removed from all `LanguageModel` methods
+and must now be provided as part of the prompt.
+
+**Prompt Constructors**
+
+```ts
+import { LanguageModel, Prompt } from "@effect/ai"
+
+const textPart = Prompt.makePart("text", {
+  text: "What is machine learning?"
+})
+
+const userMessage = Prompt.makeMessage("user", {
+  content: [textPart]
+})
+
+const systemMessage = Prompt.makeMessage("system", {
+  content: "You are an expert in machine learning"
+})
+
+const program = LanguageModel.generateText({
+  prompt: Prompt.fromMessages([
+    systemMessage,
+    userMessage
+  ])
+})
+```
+
+**Raw Prompt Input**
+
+```ts
+import { LanguageModel } from "@effect/ai"
+
+const program = LanguageModel.generateText({
+  prompt: [
+    { role: "system", content: "You are an expert in machine learning" },
+    { role: "user", content: [{ type: "text", text: "What is machine learning?" }] }
+  ]
+})
+```
+
+**NOTE**: Providing a plain string as a prompt is still supported, and will be converted 
+internally into a user message with a single text content part.
+
+### Provider-Specific Options
+
+To support specification of provider-specific options when interacting with large 
+language model providers, support has been added for adding provider-specific
+options to the parts of a `Prompt`. 
+
+```ts
+import { LanguageModel } from "@effect/ai"
+import { AnthropicLanguageModel } from "@effect/ai-anthropic"
+
+const Claude = AnthropicLanguageModel.model("claude-sonnet-4-20250514")
+
+const program = LanguageModel.generateText({
+  prompt: [
+    {
+      role: "user",
+      content: [{ type: "text", text: "What is machine learning?" }],
+      options: {
+        anthropic: { cacheControl: { type: "ephemeral", ttl: "1h" } }
+      }
+    }
+  ]
+}).pipe(Effect.provide(Claude))
+```
+
+## Responses
+
+The `Response` module has also been completely redesigned to support a wider 
+variety of response parts, particularly when streaming.
+
+### Streaming Responses
+
+When streaming text via the `LanguageModel.streamText` method, you will now 
+receive a stream of content parts instead of a stream of responses, which should
+make it much simpler to filter down the stream to the parts you are interested in.
+
+In addition, additional content parts will be present in the stream to allow you to track,
+for example, when a text content part starts / ends.
+
+### Tool Calls / Tool Call Results
+
+The decoded parts of a `Response` (as returned by the methods of `LanguageModel`)
+are now fully type-safe on tool calls / tool call results. Filtering the content parts of a 
+response to tool calls will narrow the type of the tool call `params` based on the tool
+`name`. Similarly, filtering the response to tool call results will narrow the type of the
+tool call `result` based on the tool `name`.
+
+```ts
+import { LanguageModel, Tool, Toolkit } from "@effect/ai"
+import { Effect, Schema } from "effect"
+
+const DadJokeTool = Tool.make("DadJokeTool", {
+  parameters: { topic: Schema.String },
+  success: Schema.Struct({ joke: Schema.String })
+})
+
+const FooTool = Tool.make("FooTool", {
+  parameters: { foo: Schema.Number },
+  success: Schema.Struct({ bar: Schema.Boolean })
+})
+
+const MyToolkit = Toolkit.make(DadJokeTool, FooTool)
+
+const program = Effect.gen(function*() {
+  const response = yield* LanguageModel.generateText({
+    prompt: "Tell me a dad joke",
+    toolkit: MyToolkit
+  })
+
+  for (const toolCall of response.toolCalls) {
+    if (toolCall.name === "DadJokeTool") {
+      //         ^? "DadJokeTool" | "FooTool"
+      toolCall.params
+      //       ^? { readonly topic: string }
+    }
+  }
+
+  for (const toolResult of response.toolResults) {
+    if (toolResult.name === "DadJokeTool") {
+      //           ^? "DadJokeTool" | "FooTool"
+      toolResult.result
+      //         ^? { readonly joke: string }
+    }
+  }
+})
+```
+
+### Provider Metadata
+
+As with provider-specific options, provider-specific metadata is now returned as
+part of the response from the large language model provider. 
+
+```ts
+import { LanguageModel } from "@effect/ai"
+import { AnthropicLanguageModel } from "@effect/ai-anthropic"
+import { Effect } from "effect"
+
+const Claude = AnthropicLanguageModel.model("claude-4-sonnet-20250514")
+
+const program = Effect.gen(function*() {
+  const response = yield* LanguageModel.generateText({
+    prompt: "What is the meaning of life?"
+  })
+
+  for (const part of response.content) {
+    // When metadata **is not** defined for a content part, accessing the
+    // provider's key on the part's metadata will return an untyped record
+    if (part.type === "text") {
+      const metadata = part.metadata.anthropic
+      //    ^? { readonly [x: string]: unknown } | undefined
+    }
+    // When metadata **is** defined for a content part, accessing the 
+    // provider's key on the part's metadata will return typed metadata
+    if (part.type === "reasoning") {
+      const metadata = part.metadata.anthropic
+      //    ^? AnthropicReasoningInfo | undefined
+    }
+  }
+}).pipe(Effect.provide(Claude))
+```
+
+## Tool Calls
+
+The `Tool` module has been enhanced to support provider-defined tools (e.g.
+web search, computer use, etc.). Large language model providers which support
+calling their own tools now have a separate module present in their provider 
+integration packages which contain definitions for their tools.
+
+These provider-defined tools can be included alongside user-defined tools in 
+existing `Toolkit`s. Provider-defined tools that require a user-space handler
+will be raise a type error in the associated `Toolkit` layer if no such handler
+is defined.
+
+```ts
+import { LanguageModel, Tool, Toolkit } from "@effect/ai"
+import { AnthropicTool } from "@effect/ai-anthropic"
+import { Schema } from "effect"
+
+const DadJokeTool = Tool.make("DadJokeTool", {
+  parameters: { topic: Schema.String },
+  success: Schema.Struct({ joke: Schema.String })
+})
+
+const MyToolkit = Toolkit.make(
+  DadJokeTool,
+  AnthropicTool.WebSearch_20250305({ max_uses: 1 })
+)
+
+const program = LanguageModel.generateText({
+  prompt: "Search the web for a dad joke",
+  toolkit: MyToolkit
+})
+```
+
+## AiError
+
+The `AiError` type has been refactored into a union of different error types 
+which can be raised by the Effect AI SDK. The goal of defining separate error 
+types is to allow providing the end-user with more granular information about
+the error that occurred.
+
+For now, the following errors have been defined. More error types may be added
+over time based upon necessity / use case.
+
+```ts
+type AiError = 
+  | HttpRequestError,
+  | HttpResponseError,
+  | MalformedInput,
+  | MalformedOutput,
+  | UnknownError
+```

packages/ai/ai/docgen.json

@@ -18,9 +18,7 @@
       "@effect/platform-node": ["../../../../platform-node/src/index.js"],
       "@effect/platform-node/*": ["../../../../platform-node/src/*.js"],
       "@effect/ai": ["../../../ai/src/index.js"],
-      "@effect/ai/*": ["../../../ai/src/*.js"],
-      "@effect/ai-openai": ["../../../ai-openai/src/index.js"],
-      "@effect/ai-openai/*": ["../../../ai-openai/src/*.js"]
+      "@effect/ai/*": ["../../../ai/src/*.js"]
     }
   }
 }