Load and use MCP server prompts as slash commands in the CLI (#4828)

Co-authored-by: harold <haroldmciver@google.com>
Co-authored-by: N. Taylor Mullen <ntaylormullen@google.com>

packages/core/src/config/config.ts

@@ -11,6 +11,7 @@ import {
   ContentGeneratorConfig,
   createContentGeneratorConfig,
 } from '../core/contentGenerator.js';
+import { PromptRegistry } from '../prompts/prompt-registry.js';
 import { ToolRegistry } from '../tools/tool-registry.js';
 import { LSTool } from '../tools/ls.js';
 import { ReadFileTool } from '../tools/read-file.js';
@@ -186,6 +187,7 @@ export interface ConfigParameters {
 
 export class Config {
   private toolRegistry!: ToolRegistry;
+  private promptRegistry!: PromptRegistry;
   private readonly sessionId: string;
   private contentGeneratorConfig!: ContentGeneratorConfig;
   private readonly embeddingModel: string;
@@ -314,6 +316,7 @@ export class Config {
     if (this.getCheckpointingEnabled()) {
       await this.getGitService();
     }
+    this.promptRegistry = new PromptRegistry();
     this.toolRegistry = await this.createToolRegistry();
   }
 
@@ -396,6 +399,10 @@ export class Config {
     return Promise.resolve(this.toolRegistry);
   }
 
+  getPromptRegistry(): PromptRegistry {
+    return this.promptRegistry;
+  }
+
   getDebugMode(): boolean {
     return this.debugMode;
   }