feat: integrate Pi backend and Pi Web

pi/packages/coding-agent/examples/sdk/06-extensions.ts

@@ -0,0 +1,99 @@
+/**
+ * Extensions Configuration
+ *
+ * Extensions intercept agent events and can register custom tools.
+ * They provide a unified system for extensions, custom tools, commands, and more.
+ *
+ * By default, extension files are discovered from:
+ * - ~/.pi/agent/extensions/
+ * - <cwd>/.pi/extensions/
+ * - Paths specified in settings.json "extensions" array
+ *
+ * An extension is a TypeScript file that exports a default function:
+ *   export default function (pi: ExtensionAPI) { ... }
+ */
+
+import {
+	createAgentSession,
+	DefaultResourceLoader,
+	getAgentDir,
+	SessionManager,
+} from "@earendil-works/pi-coding-agent";
+
+// Extensions are discovered automatically from standard locations.
+// You can also add paths via settings.json or DefaultResourceLoader options.
+
+const resourceLoader = new DefaultResourceLoader({
+	cwd: process.cwd(),
+	agentDir: getAgentDir(),
+	additionalExtensionPaths: ["./my-logging-extension.ts", "./my-safety-extension.ts"],
+	extensionFactories: [
+		(pi) => {
+			pi.on("agent_start", () => {
+				console.log("[Inline Extension] Agent starting");
+			});
+		},
+	],
+});
+await resourceLoader.reload();
+
+const { session } = await createAgentSession({
+	resourceLoader,
+	sessionManager: SessionManager.inMemory(),
+});
+
+try {
+	session.subscribe((event) => {
+		if (event.type === "message_update" && event.assistantMessageEvent.type === "text_delta") {
+			process.stdout.write(event.assistantMessageEvent.delta);
+		}
+	});
+
+	await session.prompt("List files in the current directory.");
+	console.log();
+} finally {
+	session.dispose();
+}
+
+// Example extension file (./my-logging-extension.ts):
+/*
+import type { ExtensionAPI } from "@earendil-works/pi-coding-agent";
+
+export default function (pi: ExtensionAPI) {
+	pi.on("agent_start", async () => {
+		console.log("[Extension] Agent starting");
+	});
+
+	pi.on("tool_call", async (event) => {
+		console.log(\`[Extension] Tool: \${event.toolName}\`);
+		// Return { block: true, reason: "..." } to block execution
+		return undefined;
+	});
+
+	pi.on("agent_end", async (event) => {
+		console.log(\`[Extension] Done, \${event.messages.length} messages\`);
+	});
+
+	// Register a custom tool
+	pi.registerTool({
+		name: "my_tool",
+		label: "My Tool",
+		description: "Does something useful",
+		parameters: Type.Object({
+			input: Type.String(),
+		}),
+		execute: async (_toolCallId, params, _signal, _onUpdate, _ctx) => ({
+			content: [{ type: "text", text: \`Processed: \${params.input}\` }],
+			details: {},
+		}),
+	});
+
+	// Register a command
+	pi.registerCommand("mycommand", {
+		description: "Do something",
+		handler: async (args, ctx) => {
+			ctx.ui.notify(\`Command executed with: \${args}\`);
+		},
+	});
+}
+*/