feat(coding-agent): add ExtensionAPI.getCommands()

packages/coding-agent/src/core/agent-session.ts

@@ -67,6 +67,7 @@ import { expandPromptTemplate, type PromptTemplate } from "./prompt-templates.js
 import type { ResourceExtensionPaths, ResourceLoader } from "./resource-loader.js";
 import type { BranchSummaryEntry, CompactionEntry, SessionManager } from "./session-manager.js";
 import type { SettingsManager } from "./settings-manager.js";
+import { BUILTIN_SLASH_COMMANDS, type SlashCommandInfo, type SlashCommandLocation } from "./slash-commands.js";
 import { buildSystemPrompt } from "./system-prompt.js";
 import type { BashOperations } from "./tools/bash.js";
 import { createAllTools } from "./tools/index.js";
@@ -1775,6 +1776,45 @@ export class AgentSession {
 	}
 
 	private _bindExtensionCore(runner: ExtensionRunner): void {
+		const normalizeLocation = (source: string): SlashCommandLocation | undefined => {
+			if (source === "user" || source === "project" || source === "path") {
+				return source;
+			}
+			return undefined;
+		};
+
+		const reservedBuiltins = new Set(BUILTIN_SLASH_COMMANDS.map((command) => command.name));
+
+		const getCommands = (): SlashCommandInfo[] => {
+			const extensionCommands: SlashCommandInfo[] = runner
+				.getRegisteredCommandsWithPaths()
+				.filter(({ command }) => !reservedBuiltins.has(command.name))
+				.map(({ command, extensionPath }) => ({
+					name: command.name,
+					description: command.description,
+					source: "extension",
+					path: extensionPath,
+				}));
+
+			const templates: SlashCommandInfo[] = this.promptTemplates.map((template) => ({
+				name: template.name,
+				description: template.description,
+				source: "template",
+				location: normalizeLocation(template.source),
+				path: template.filePath,
+			}));
+
+			const skills: SlashCommandInfo[] = this._resourceLoader.getSkills().skills.map((skill) => ({
+				name: `skill:${skill.name}`,
+				description: skill.description,
+				source: "skill",
+				location: normalizeLocation(skill.source),
+				path: skill.filePath,
+			}));
+
+			return [...extensionCommands, ...templates, ...skills];
+		};
+
 		runner.bindCore(
 			{
 				sendMessage: (message, options) => {
@@ -1810,6 +1850,7 @@ export class AgentSession {
 				getActiveTools: () => this.getActiveToolNames(),
 				getAllTools: () => this.getAllTools(),
 				setActiveTools: (toolNames) => this.setActiveToolsByName(toolNames),
+				getCommands,
 				setModel: async (model) => {
 					const key = await this.modelRegistry.getApiKey(model);
 					if (!key) return false;