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|
/**
* pi-browser-harness — browser control extension for pi.
*
* Gives pi agents full control of a real Chrome browser via CDP.
* Spawns the browser-harness daemon, 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 daemon status and current page
* /browser-reload-daemon — restart the daemon
*
* Flags:
* --browser-namespace <name> — override BU_NAME (default: auto)
* --browser-debug-clicks — enable debug click overlay
*/
import type { ExtensionAPI, ExtensionContext } from "@mariozechner/pi-coding-agent";
import { BrowserDaemon } from "./daemon";
import { getBrowserSystemPrompt } from "./prompt";
import { registerRenderers } from "./renderers";
import { registerSetupCommand } from "./setup";
import { type BrowserState, defaultState, persistState, restoreState } from "./state";
import { cleanupTempDirs, registerTools } from "./tools";
export default function browserHarnessExtension(pi: ExtensionAPI) {
// ── Resolve namespace ──────────────────────────────────────────────────────
const flagNs = pi.getFlag("browser-namespace") as string | undefined;
const namespace = flagNs || `pi-${Math.random().toString(36).slice(2, 10)}`;
// ── State ──────────────────────────────────────────────────────────────────
let state: BrowserState = defaultState(namespace);
let daemon: BrowserDaemon | null = null;
// ── Tool initialization flag ───────────────────────────────────────────────
let toolsRegistered = false;
// ═══════════════════════════════════════════════════════════════════════════
// Flags
// ═══════════════════════════════════════════════════════════════════════════
pi.registerFlag("browser-namespace", {
description: "Browser daemon namespace (BU_NAME). Default: auto-generated",
type: "string",
});
pi.registerFlag("browser-debug-clicks", {
description: "Enable debug click overlay (saves annotated screenshots to /tmp)",
type: "boolean",
default: false,
});
// ═══════════════════════════════════════════════════════════════════════════
// Commands
// ═══════════════════════════════════════════════════════════════════════════
pi.registerCommand("browser-status", {
description: "Show browser connection status and current page",
handler: async (_args, ctx) => {
if (!daemon) {
ctx.ui.notify("Browser daemon not started. Run /browser-setup first.", "warning");
return;
}
const status = daemon.getStatus();
const lines = [
`Browser: ${status.alive ? "🟢 Connected" : "🔴 Disconnected"}`,
`Session: ${status.sessionId || "none"}`,
];
if (status.remoteBrowserId) {
lines.push(`Browser ID: ${status.remoteBrowserId}`);
}
// Try to get current page info
if (status.alive) {
try {
const info = await daemon.getPageInfo();
if ("dialog" in info) {
lines.push(`\n⚠️ Dialog open: ${info.dialog.type} — "${info.dialog.message}"`);
} else {
lines.push(`\nCurrent Page:`);
lines.push(` URL: ${info.url}`);
lines.push(` Title: ${info.title}`);
lines.push(` Viewport: ${info.width}x${info.height}`);
}
} catch {
lines.push("\n(Could not read page info)");
}
}
ctx.ui.notify(lines.join("\n"), "info");
},
});
pi.registerCommand("browser-reload-daemon", {
description: "Restart the browser daemon",
handler: async (_args, ctx) => {
if (!daemon) {
ctx.ui.notify("Browser daemon not started.", "warning");
return;
}
ctx.ui.notify("Restarting browser daemon...", "info");
try {
await daemon.stop();
await daemon.start();
ctx.ui.notify("Browser daemon restarted ✓", "info");
} catch (err) {
ctx.ui.notify(
`Restart failed: ${err instanceof Error ? err.message : String(err)}`,
"error",
);
}
},
});
// ═══════════════════════════════════════════════════════════════════════════
// Session lifecycle
// ═══════════════════════════════════════════════════════════════════════════
pi.on("session_start", async (_event, ctx) => {
// Restore persisted state (preserving the current namespace from flag)
state = restoreState(ctx, state.namespace);
// Create daemon instance
daemon = new BrowserDaemon(state.namespace);
// Attempt to start daemon (will fail gracefully if Chrome not connected)
try {
await daemon.start();
} catch {
// Don't block — user can run /browser-setup later
}
// Register tools (once)
if (!toolsRegistered && daemon) {
registerTools(pi, daemon);
toolsRegistered = true;
}
// Register renderers
registerRenderers(pi);
// Setup command (always available)
if (daemon) {
registerSetupCommand(pi, daemon);
}
// Update status
if (daemon.getStatus().alive) {
ctx.ui.setStatus("browser", "🟢 Browser connected");
} else {
ctx.ui.setStatus("browser", "🔴 Browser — run /browser-setup");
}
});
pi.on("session_shutdown", async (_event) => {
// Persist current state
if (state) {
persistState(pi, state);
}
// Stop daemon
if (daemon) {
try {
await daemon.stop();
} catch {
// best-effort
}
daemon = null;
}
toolsRegistered = false;
// Clean up temp files from truncated tool outputs
await cleanupTempDirs();
});
// Restore state on tree navigation
pi.on("session_tree", async (_event, ctx) => {
state = restoreState(ctx, daemon?.namespace);
if (daemon) {
persistState(pi, state);
}
});
// ═══════════════════════════════════════════════════════════════════════════
// System prompt injection
// ═══════════════════════════════════════════════════════════════════════════
pi.on("before_agent_start", async (event) => {
if (!daemon || !daemon.getStatus().alive) {
// Browser not connected — inject minimal note
return {
systemPrompt:
event.systemPrompt +
`\n\n## Browser Control\n\nBrowser tools (browser_*) are available but the browser daemon is not connected. ` +
`Run /browser-setup to connect to Chrome, or /browser-status to check.`,
};
}
return {
systemPrompt: event.systemPrompt + getBrowserSystemPrompt(),
};
});
// ═══════════════════════════════════════════════════════════════════════════
// Tool result hook: track tab history
// ═══════════════════════════════════════════════════════════════════════════
pi.on("tool_result", async (event) => {
if (event.toolName === "browser_new_tab" || event.toolName === "browser_navigate") {
// Track new tabs in history
const details = event.details as { targetId?: string } | undefined;
if (details?.targetId) {
state = {
...state,
tabHistory: [details.targetId, ...state.tabHistory.filter((id) => id !== details.targetId)].slice(0, 20),
};
persistState(pi, state);
}
}
});
}
|
