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import { Type } from "typebox";
import { Compile } from "typebox/compile";
import { parseJson } from "../../schemas/parse";
import { type Result, err, ok } from "../../util/result";
import { applyTruncation } from "../../util/truncate";
import { defineBrowserTool, type ToolErr, type ToolOk } from "../../util/tool";
import { cdpCallBrowser, evalJs } from "../cdp-call";
import {
closeIsolatedTab,
evalInIsolatedTab,
isJsonText,
type IsolatedTab,
navigateIsolatedTab,
openIsolatedTab,
waitForIsolatedLoad,
} from "../isolated-tab";
import { renderExpandableText } from "../render";
import { extractReadable, type PageCapture, type ReadablePage } from "./readability";
const LOAD_TIMEOUT_MS = 15_000;
const ReadPageArgs = Type.Object({
url: Type.Optional(Type.String({ description: "URL to open in an isolated tab, read, then close." })),
targetId: Type.Optional(
Type.String({ description: "Read an already-open tab this session owns instead of opening a URL." }),
),
});
const ContentBlockSchema = Type.Object({
kind: Type.Union([
Type.Literal("paragraph"),
Type.Literal("heading"),
Type.Literal("listitem"),
Type.Literal("blockquote"),
Type.Literal("other"),
]),
text: Type.String(),
linkTextLength: Type.Number(),
inBoilerplate: Type.Boolean(),
});
const PageCaptureSchema = Type.Object({
url: Type.String(),
title: Type.String(),
blocks: Type.Array(ContentBlockSchema),
bodyText: Type.String(),
});
const pageCaptureValidator = Compile(PageCaptureSchema);
const BODY_TEXT_LIMIT = 20_000;
const buildPageCaptureExpr = (): string => `
(() => {
const BOILERPLATE = new Set(['NAV', 'HEADER', 'FOOTER', 'ASIDE']);
const inBoilerplate = (el) => {
for (let n = el; n; n = n.parentElement) {
if (BOILERPLATE.has(n.tagName)) return true;
const role = n.getAttribute && n.getAttribute('role');
if (role === 'navigation' || role === 'banner' || role === 'contentinfo') return true;
}
return false;
};
const kindOf = (tag) => {
if (/^H[1-6]$/.test(tag)) return 'heading';
if (tag === 'LI') return 'listitem';
if (tag === 'BLOCKQUOTE') return 'blockquote';
if (tag === 'P') return 'paragraph';
return 'other';
};
const selector = 'p, h1, h2, h3, h4, h5, h6, li, blockquote';
const root = document.querySelector('article, main, [role=main]') || document.body;
const blocks = [];
for (const el of root.querySelectorAll(selector)) {
const text = (el.innerText || '').replace(/\\s+/g, ' ').trim();
if (!text) continue;
let linkTextLength = 0;
for (const a of el.querySelectorAll('a')) linkTextLength += (a.innerText || '').length;
blocks.push({ kind: kindOf(el.tagName), text, linkTextLength, inBoilerplate: inBoilerplate(el) });
}
const bodyText = (document.body.innerText || '').replace(/\\n{3,}/g, '\\n\\n').slice(0, ${BODY_TEXT_LIMIT});
return JSON.stringify({ url: location.href, title: document.title, blocks, bodyText });
})()
`;
const toPageCapture = (raw: unknown): PageCapture | undefined => {
if (typeof raw === "string") {
const parsed = parseJson(raw, pageCaptureValidator);
return parsed.success ? parsed.data : undefined;
}
return pageCaptureValidator.Check(raw) ? raw : undefined;
};
const captureToResult = async (raw: unknown): Promise<Result<ToolOk, ToolErr>> => {
const parsed = toPageCapture(raw);
if (parsed === undefined) return err({ kind: "internal", message: "page capture returned an unexpected shape" });
const page: ReadablePage = extractReadable(parsed);
const header = `# ${page.title}\n${page.url}\n(${page.wordCount} words)\n\n`;
const truncated = await applyTruncation(header + page.text, "readpage");
const summary = `${page.title} · ${page.wordCount} words`;
return ok({
text: truncated.text,
details: {
title: page.title,
url: page.url,
wordCount: page.wordCount,
render: {
summary,
body: page.text,
...(truncated.fullOutputPath !== undefined ? { fullOutputPath: truncated.fullOutputPath } : {}),
},
...(truncated.fullOutputPath !== undefined ? { fullOutputPath: truncated.fullOutputPath } : {}),
},
});
};
const readOpenedUrl = async (
client: Parameters<typeof openIsolatedTab>[0],
url: string,
signal: AbortSignal | undefined,
): Promise<Result<ToolOk, ToolErr>> => {
const opened = await openIsolatedTab(client);
if (!opened.success) return err(opened.error);
const tab: IsolatedTab = opened.data;
try {
const navigated = await navigateIsolatedTab(client, tab, url);
if (!navigated.success) return err(navigated.error);
const loaded = await waitForIsolatedLoad(client, tab, LOAD_TIMEOUT_MS, signal);
if (!loaded.success) return err(loaded.error);
const captured = await evalInIsolatedTab(client, tab, buildPageCaptureExpr(), isJsonText);
if (!captured.success) return err(captured.error);
return captureToResult(captured.data);
} finally {
await closeIsolatedTab(client, tab);
}
};
const readOwnedTab = async (
client: Parameters<typeof openIsolatedTab>[0],
targetId: string,
): Promise<Result<ToolOk, ToolErr>> => {
if (!client.owns(targetId)) {
return err({ kind: "invalid_state", message: `Tab ${targetId} is not owned by this session.` });
}
const attached = await cdpCallBrowser(client, "Target.attachToTarget", { targetId, flatten: true });
if (!attached.success) return attached;
const sessionId = attached.data.sessionId;
const captured = await evalJs(client, buildPageCaptureExpr(), sessionId);
if (!captured.success) return captured;
return captureToResult(captured.data);
};
export const readPageTool = defineBrowserTool({
name: "browser_read_page",
label: "Browser Read Page",
description:
"Read a page as clean article text — main content with nav/ads/boilerplate stripped. Pass a url (opened in an isolated tab, read, then closed) or a targetId of an owned tab. Reader-mode counterpart to browser_web_search.",
promptSnippet: "Read a page's main content as clean text",
promptGuidelines: [
"Returns readable main-article text — use this over browser_snapshot/browser_execute_js when you want an article's content for reading or research.",
"Boilerplate-heavy or structure-less pages fall back to bounded body text rather than erroring.",
],
parameters: ReadPageArgs,
concurrency: "parallel",
async handler(args, { client, signal }): Promise<Result<ToolOk, ToolErr>> {
if (args.url !== undefined && args.url.length > 0) return readOpenedUrl(client, args.url, signal);
if (args.targetId !== undefined && args.targetId.length > 0) return readOwnedTab(client, args.targetId);
return err({ kind: "invalid_state", message: "provide either url or targetId" });
},
renderResult(result, expanded, theme) {
return renderExpandableText("read_page", result, expanded, theme);
},
});
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