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import type { ExtensionAPI } from "@mariozechner/pi-coding-agent";
import { type BrowserClient, createBrowserClient } from "./client";
import { getBrowserSystemPrompt } from "./prompt";
import { registerSetupCommand } from "./setup";
import { registerProfileCommand } from "./profile/command";
import { readPin } from "./profile/store";
import { type BrowserState, createStatePersister, defaultState, restoreState } from "./state";
import { registerAllTools } from "./registry";
import { cleanupTempDirs } from "./util/truncate";
import { restoreDownloadBehavior } from "./domains/files";
import { createDaemonTransport } from "./daemon/transport";
import { setDebugClicks } from "./util/debug";
import { asBoolean, asString } from "./util/guards";
export default function browserHarnessExtension(pi: ExtensionAPI): void {
const flagNs = asString(pi.getFlag("browser-namespace"));
const namespace = flagNs ?? `pi-${Math.random().toString(36).slice(2, 10)}`;
let state: BrowserState = defaultState(namespace);
const persister = createStatePersister(pi);
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 pin = client.profilePin();
const lines = [
`Browser: ${s.alive ? "š¢ Connected" : "š“ Disconnected"}`,
`Profile: ${pin ? pin.label : "not selected (uses whichever window is focused) ā run /browser-profile"}`,
`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(`\nā ļø Dialog open: ${info.data.dialog.type} ā "${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 ā", "info");
} else {
ctx.ui.notify(`Restart failed: ${r.error.message}`, "error");
}
},
});
pi.on("session_start", async (_event, ctx) => {
state = restoreState(ctx, state.namespace);
persister.markPersisted(state);
setDebugClicks(asBoolean(pi.getFlag("browser-debug-clicks")) ?? false);
// Re-read the on-disk profile pin every session start: another pi session may have changed it since this client was created.
const profilePin = await readPin();
if (!client) {
const transport = createDaemonTransport(state.namespace);
const initialOwnership: { ownedTargetIds?: ReadonlyArray<string>; harnessWindowTargetId?: string; harnessWindowId?: number } = {};
if (state.ownedTargetIds !== undefined) initialOwnership.ownedTargetIds = state.ownedTargetIds;
if (state.harnessWindowTargetId !== undefined) initialOwnership.harnessWindowTargetId = state.harnessWindowTargetId;
if (state.harnessWindowId !== undefined) initialOwnership.harnessWindowId = state.harnessWindowId;
client = createBrowserClient({
namespace: state.namespace,
transport,
profilePin,
...(Object.keys(initialOwnership).length > 0 ? { initialOwnership } : {}),
onOwnershipChange: (snap) => {
state = {
...state,
ownedTargetIds: snap.ownedTargetIds,
...(snap.harnessWindowTargetId !== undefined
? { harnessWindowTargetId: snap.harnessWindowTargetId }
: {}),
...(snap.harnessWindowId !== undefined
? { harnessWindowId: snap.harnessWindowId }
: {}),
};
try { persister.persist(state); } catch {}
},
});
} else {
client.setProfilePin(profilePin);
}
if (!toolsRegistered) {
registerAllTools(pi, client);
toolsRegistered = true;
}
registerSetupCommand(pi, client);
registerProfileCommand(pi, client);
});
pi.on("session_shutdown", async () => {
if (client) {
try {
// Warn but keep going: detach and tab cleanup still have to run, and a throw here would skip both.
const restored = await restoreDownloadBehavior(client);
if (!restored.success) {
console.warn(`[pi-browser-harness] ${restored.error.message}`);
}
await client.detach();
await client.closeOwnedTabs();
} catch (e) {
console.warn("[pi-browser-harness] browser teardown failed during shutdown:", e);
}
// Do NOT stop the client or null it out: the surviving daemon connection is what eliminates the per-session "Allow Remote Debugging" prompt.
}
persister.persist(state);
await cleanupTempDirs();
});
// The branch already holds the restored snapshot: re-appending it only grows the session file.
pi.on("session_tree", async (_event, ctx) => {
state = restoreState(ctx, client?.namespace);
persister.markPersisted(state);
});
pi.on("before_agent_start", async (event) => {
return {
systemPrompt: event.systemPrompt + getBrowserSystemPrompt(client?.status().alive ?? false),
};
});
}
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