feat(acp-ai-provider): Add session initialization and mode management methods

Author: yaonyan

packages/acp-ai-provider/README.md

@@ -152,10 +152,8 @@ const provider = createACPProvider({
   persistSession: true,
 });
 
-const model = provider.languageModel();
-
 // Initialize and get available options
-const session = await model.initSession();
+const session = await provider.initSession();
 
 // Check available modes (e.g., "ask", "code", "architect")
 console.log(session.modes?.availableModes);
@@ -164,10 +162,13 @@ console.log(session.modes?.availableModes);
 console.log(session.models?.availableModels);
 
 // Select a mode before prompting
-await model.setMode("code");
+await provider.setMode("code");
 
 // Now use the model
-const result = await generateText({ model, prompt: "..." });
+const result = await generateText({
+  model: provider.languageModel(),
+  prompt: "...",
+});
 ```
 
 ## FAQ

packages/acp-ai-provider/deno.json

@@ -1,6 +1,6 @@
 {
   "name": "@mcpc/acp-ai-provider",
-  "version": "0.1.23",
+  "version": "0.1.24",
   "repository": {
     "type": "git",
     "url": "git+https://github.com/mcpc-tech/mcpc.git"

packages/acp-ai-provider/src/provider.ts

@@ -5,6 +5,7 @@
 import { ACPLanguageModel } from "./language-model.ts";
 import type { ACPProviderSettings } from "./types.ts";
 import type { tool } from "ai";
+import type { NewSessionResponse } from "@agentclientprotocol/sdk";
 
 /**
  * ACP Provider - implements AI SDK provider pattern
@@ -54,6 +55,37 @@ export class ACPProvider {
     return this.model?.getSessionId() ?? null;
   }
 
+  /**
+   * Initializes the session and returns session info (models, modes, meta).
+   * Call this before prompting to discover available options.
+   */
+  initSession(): Promise<NewSessionResponse> {
+    if (!this.model) {
+      this.languageModel();
+    }
+    return this.model!.initSession();
+  }
+
+  /**
+   * Sets the session mode (e.g., "ask", "plan").
+   */
+  setMode(modeId: string): Promise<void> {
+    if (!this.model) {
+      throw new Error("No model initialized. Call languageModel() first.");
+    }
+    return this.model.setMode(modeId);
+  }
+
+  /**
+   * Sets the session model.
+   */
+  setModel(modelId: string): Promise<void> {
+    if (!this.model) {
+      throw new Error("No model initialized. Call languageModel() first.");
+    }
+    return this.model.setModel(modelId);
+  }
+
   /**
    * Forces cleanup of the connection and session.
    * Call this when you're done with the provider instance, especially when using `persistSession`.