Web search and content fetching extension for Pi using the Linkup API.
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10 kB · 334 lines
TypeScript
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interface WebAnswerSourceDetails extends LinkupSource { snippetTruncated?: boolean; snippetTempFilePath?: string; snippetTotalLines?: number; snippetTotalBytes?: number;}
interface WebAnswerDetails { answer?: string; sources?: WebAnswerSourceDetails[]; query?: string; answerTruncated?: boolean; answerTempFilePath?: string; answerTotalLines?: number; answerTotalBytes?: number;}
interface PerResultPreview { preview: string; tempFilePath?: string; truncated: boolean; totalLines: number; totalBytes: number;}
const parameters = Type.Object({ query: Type.String({ description: "The question to answer. Be specific and detailed for best results.", }), depth: Type.Optional(SearchDepth),});
type WebAnswerParams = Static<typeof parameters>;
function slugifyTempName(slug: string) { return ( slug .toLowerCase() .replace(/[^a-z0-9]+/g, "-") .replace(/^-+|-+$/g, "") .slice(0, 64) || "result" );}
async function writePerResultPreview( content: string, slug: string, maxLines = DEFAULT_MAX_LINES, maxBytes = DEFAULT_MAX_BYTES,): Promise<PerResultPreview> { const result = truncateHead(content, { maxLines, maxBytes }); let preview = result.content; let tempFilePath: string | undefined;
if (result.truncated) { tempFilePath = join( tmpdir(), `pi-linkup-answer-${slugifyTempName(slug)}-${randomBytes(4).toString("hex")}.md`, ); await writeFile(tempFilePath, content, "utf8"); preview += `\n\n[Result truncated: ${result.outputLines} of ${result.totalLines} lines (${formatSize(result.outputBytes)} of ${formatSize(result.totalBytes)}). Full result: ${tempFilePath}]`; }
return { preview, tempFilePath, truncated: result.truncated, totalLines: result.totalLines, totalBytes: result.totalBytes, };}
function indentMultiline(text: string, prefix: string) { return text .split("\n") .map((line) => `${prefix}${line}`) .join("\n");}
export const webAnswerTool = { name: "linkup_web_answer", label: "Linkup Web Answer", description: "Get a synthesized answer to a question using Linkup API. Returns a direct answer with sources. Use when you need a concise answer to a specific question.", promptSnippet: "Answer a question with cited web sources.", promptGuidelines: [ "Use linkup_web_answer when the user wants a direct answer with cited sources rather than exploratory browsing.", "Prefer linkup_web_answer over linkup_web_search when the goal is a concise answer, not source discovery.", "Use deeper search depth for linkup_web_answer for more complex or high-stakes questions.", ], parameters,
async execute( _toolCallId: string, params: WebAnswerParams, signal: AbortSignal | undefined, onUpdate: AgentToolUpdateCallback<WebAnswerDetails> | undefined, _ctx: ExtensionContext, ) { const client = getClient();
onUpdate?.({ content: [ { type: "text" as const, text: `Searching for answer${params.depth && params.depth !== "standard" ? ` (${params.depth} mode)` : ""}...`, }, ], details: {}, });
const response = (await client.search({ query: params.query, depth: (params.depth ?? "standard") as SearchDepthType, outputType: "sourcedAnswer", signal, })) as LinkupSourcedAnswerResponse;
const answerPreview = await writePerResultPreview( response.answer, "answer", ); const sources: WebAnswerSourceDetails[] = [];
let content = `${answerPreview.preview}\n\n`; content += "Sources:\n"; for (const [index, source] of response.sources.entries()) { content += `- ${source.name}: ${source.url}\n`;
if (source.snippet) { const snippetPreview = await writePerResultPreview( source.snippet, `source-${index + 1}`, ); content += `${indentMultiline(snippetPreview.preview, " ")}\n`; sources.push({ name: source.name, url: source.url, snippet: snippetPreview.preview, snippetTruncated: snippetPreview.truncated, snippetTempFilePath: snippetPreview.tempFilePath, snippetTotalLines: snippetPreview.totalLines, snippetTotalBytes: snippetPreview.totalBytes, }); } else { sources.push({ name: source.name, url: source.url, }); } }
return { content: [{ type: "text" as const, text: content }], details: { answer: answerPreview.preview, sources, query: params.query, answerTruncated: answerPreview.truncated, answerTempFilePath: answerPreview.tempFilePath, answerTotalLines: answerPreview.totalLines, answerTotalBytes: answerPreview.totalBytes, }, }; },
renderCall(args: WebAnswerParams, theme: Theme) { const optionArgs = []; if (args.depth && args.depth !== "standard") { optionArgs.push({ label: "depth", value: args.depth }); }
return new ToolCallHeader( { toolName: "Linkup: WebAnswer", mainArg: `"${args.query}"`, showColon: true, optionArgs, }, theme, ); },
renderResult( result: AgentToolResult<WebAnswerDetails>, options: ToolRenderResultOptions, theme: Theme, ) { const { expanded, isPartial } = options;
if (isPartial) { return new Text( theme.fg("muted", "Linkup: WebAnswer: fetching..."), 0, 0, ); }
const details = result.details; const container = new Container();
// When the tool throws, the framework calls renderResult with // details={} (empty object) and the error message in content. if (!details?.answer) { const textBlock = result.content.find((c) => c.type === "text"); const errorMsg = (textBlock?.type === "text" && textBlock.text) || "Search failed"; container.addChild(new Text(theme.fg("error", errorMsg), 0, 0)); return container; }
const answer = details.answer; const sources = details.sources || [];
if (!expanded) { // Collapsed: answer preview + source count let text = theme.fg("success", "Answer received"); const preview = answer.slice(0, 100); text += `\n ${theme.fg("muted", preview)}`; if (answer.length > 100) { text += theme.fg("dim", "..."); } text += `\n ${theme.fg("dim", `${sources.length} source(s)`)}`; text += theme.fg("muted", ` ${keyHint("app.tools.expand", "to expand")}`); container.addChild(new Text(text, 0, 0)); } else { // Expanded: full answer + sources container.addChild( new Text(theme.fg("success", "Answer received"), 0, 0), ); container.addChild(new Text("", 0, 0)); container.addChild( new Markdown(answer, 0, 0, getMarkdownTheme(), { color: (text: string) => theme.fg("toolOutput", text), }), ); if (details.answerTruncated && details.answerTempFilePath) { container.addChild( new Text( theme.fg( "warning", `Answer truncated. Full content: ${details.answerTempFilePath}`, ), 0, 0, ), ); }
if (sources.length > 0) { container.addChild(new Text("", 0, 0)); container.addChild( new Text(theme.fg("accent", theme.bold("Sources")), 0, 0), );
for (const source of sources) { container.addChild(new Text("", 0, 0)); container.addChild( new Text( `${theme.fg("dim", ">")} ${theme.fg("accent", theme.bold(source.name))}`, 0, 0, ), ); container.addChild( new Text(` ${theme.fg("dim", source.url)}`, 0, 0), ); if (source.snippet) { container.addChild(new Text("", 0, 0)); const snippet = source.snippet .split("\n") .slice(0, 3) .map((line) => `> ${line}`) .join("\n"); container.addChild( new Markdown(snippet, 0, 0, getMarkdownTheme(), { color: (text: string) => theme.fg("toolOutput", text), }), ); if (source.snippetTruncated && source.snippetTempFilePath) { container.addChild( new Text( theme.fg( "warning", `Source snippet truncated. Full content: ${source.snippetTempFilePath}`, ), 0, 0, ), ); } } } } }
container.addChild(new Text("", 0, 0)); container.addChild( new ToolFooter(theme, { items: [{ label: "sources", value: `${sources.length} source(s)` }], separator: " | ", }), );
return container; }, // biome-ignore lint/suspicious/noExplicitAny: Type safety provided by registerTool call} as any;