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|
/**
* pi-browser-harness — browser control extension for pi.
*
* Gives pi agents full control of a real Chrome browser via CDP.
* Connects to the user's running Chrome (chrome://inspect/#remote-debugging),
* registers browser_* tools, and injects browser control guidance into the
* system prompt.
*
* Install:
* pi install npm:pi-browser-harness
* # or copy to .pi/extensions/pi-browser-harness/
*
* Commands:
* /browser-setup — guided setup wizard
* /browser-status — show client status and current page
* /browser-reload-daemon — restart the browser client
*
* Flags:
* --browser-namespace <name> — override namespace (default: auto)
* --browser-debug-clicks — enable debug click overlay
*/
import type { ExtensionAPI } from "@mariozechner/pi-coding-agent";
import { type BrowserClient, createBrowserClient } from "./client";
import { getBrowserSystemPrompt } from "./prompt";
import { registerSetupCommand } from "./setup";
import { type BrowserState, defaultState, persistState, restoreState } from "./state";
import { registerAllTools } from "./registry";
import { cleanupTempDirs } from "./util/truncate";
export default function browserHarnessExtension(pi: ExtensionAPI): void {
const flagNs = pi.getFlag("browser-namespace") as string | undefined;
const namespace = flagNs ?? `pi-${Math.random().toString(36).slice(2, 10)}`;
let state: BrowserState = defaultState(namespace);
let client: BrowserClient | null = null;
let toolsRegistered = false;
pi.registerFlag("browser-namespace", {
description: "Browser daemon namespace. Default: auto-generated",
type: "string",
});
pi.registerFlag("browser-debug-clicks", {
description: "Enable debug click overlay (saves annotated screenshots to /tmp)",
type: "boolean",
default: false,
});
pi.registerCommand("browser-status", {
description: "Show browser connection status and current page",
handler: async (_args, ctx) => {
if (!client) {
ctx.ui.notify("Browser client not started. Run /browser-setup first.", "warning");
return;
}
const s = client.status();
const lines = [
`Browser: ${s.alive ? "🟢 Connected" : "🔴 Disconnected"}`,
`Session: ${s.sessionId ?? "none"}`,
];
if (s.remoteBrowserId) lines.push(`Browser ID: ${s.remoteBrowserId}`);
if (s.alive) {
const info = await client.pageInfo();
if (info.success) {
if ("dialog" in info.data) {
lines.push(`\n⚠️ Dialog open: ${info.data.dialog.type} — "${info.data.dialog.message}"`);
} else {
lines.push(
`\nCurrent Page:`,
` URL: ${info.data.url}`,
` Title: ${info.data.title}`,
` Viewport: ${info.data.width}x${info.data.height}`,
);
}
}
}
ctx.ui.notify(lines.join("\n"), "info");
},
});
pi.registerCommand("browser-reload-daemon", {
description: "Restart the browser client",
handler: async (_args, ctx) => {
if (!client) {
ctx.ui.notify("Browser client not started.", "warning");
return;
}
ctx.ui.notify("Restarting browser client...", "info");
await client.stop();
const r = await client.start();
if (r.success) {
ctx.ui.notify("Browser client restarted ✓", "info");
} else {
ctx.ui.notify(`Restart failed: ${r.error.message}`, "error");
}
},
});
pi.on("session_start", async (_event, ctx) => {
state = restoreState(ctx, state.namespace);
client = createBrowserClient({ namespace: state.namespace });
// failure is fine — surfaced via tool errors when the agent first tries to use the browser
await client.start();
if (!toolsRegistered) {
registerAllTools(pi, client);
toolsRegistered = true;
}
registerSetupCommand(pi, client);
ctx.ui.setStatus(
"browser",
client.status().alive ? "🟢 Browser connected" : "🔴 Browser — run /browser-setup",
);
});
pi.on("session_shutdown", async () => {
persistState(pi, state);
if (client) {
try {
await client.stop();
} catch (e) {
// Shutdown is best-effort, but a stuck stop() points at a transport
// bug worth surfacing for debugging.
console.warn("[pi-browser-harness] client.stop() failed during shutdown:", e);
}
client = null;
}
toolsRegistered = false;
await cleanupTempDirs();
});
pi.on("session_tree", async (_event, ctx) => {
state = restoreState(ctx, client?.namespace);
persistState(pi, state);
});
pi.on("before_agent_start", async (event) => {
if (!client || !client.status().alive) {
return {
systemPrompt:
event.systemPrompt +
`\n\n## Browser Control\n\nBrowser tools (browser_*) are available but the browser is not connected. Run /browser-setup.`,
};
}
return { systemPrompt: event.systemPrompt + getBrowserSystemPrompt() };
});
}
|
