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merged 1 commit into from
Jul 22, 2025
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refactor(@angular/cli): include content for top result in MCP documentation search tool #30754

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123 changes: 94 additions & 29 deletions packages/angular/cli/src/commands/mcp/tools/doc-search.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -53,9 +53,14 @@ export async function registerDocSearchTool(server: McpServer): Promise<void> {
.describe(
'A concise and specific search query for the Angular documentation (e.g., "NgModule" or "standalone components").',
),
includeTopContent: z
.boolean()
.optional()
.default(true)
.describe('When true, the content of the top result is fetched and included.'),
},
},
async ({ query }) => {
async ({ query, includeTopContent }) => {
if (!client) {
const dcip = createDecipheriv(
'aes-256-gcm',
Expand All @@ -71,40 +76,100 @@ export async function registerDocSearchTool(server: McpServer): Promise<void> {

const { results } = await client.search(createSearchArguments(query));

// Convert results into text content entries instead of stringifying the entire object
const content = results.flatMap((result) =>
(result as SearchResponse).hits.map((hit) => {
// eslint-disable-next-line @typescript-eslint/no-explicit-any
const hierarchy = Object.values(hit.hierarchy as any).filter(
(x) => typeof x === 'string',
);
const title = hierarchy.pop();
const description = hierarchy.join(' > ');

return {
type: 'text' as const,
text: `## ${title}\n${description}\nURL: ${hit.url}`,
};
}),
);

// Return the search results if any are found
if (content.length > 0) {
return { content };
const allHits = results.flatMap((result) => (result as SearchResponse).hits);

if (allHits.length === 0) {
return {
content: [
{
type: 'text' as const,
text: 'No results found.',
},
],
};
}

return {
content: [
{
type: 'text' as const,
text: 'No results found.',
},
],
};
const content = [];
// The first hit is the top search result
const topHit = allHits[0];

// Process top hit first
let topText = formatHitToText(topHit);

try {
if (includeTopContent && typeof topHit.url === 'string') {
const url = new URL(topHit.url);

// Only fetch content from angular.dev
if (url.hostname === 'angular.dev' || url.hostname.endsWith('.angular.dev')) {
const response = await fetch(url);
if (response.ok) {
const html = await response.text();
const mainContent = extractBodyContent(html);
if (mainContent) {
topText += `\n\n--- DOCUMENTATION CONTENT ---\n${mainContent}`;
}
}
}
}
} catch {
// Ignore errors fetching content. The basic info is still returned.
}
content.push({
type: 'text' as const,
text: topText,
});

// Process remaining hits
for (const hit of allHits.slice(1)) {
content.push({
type: 'text' as const,
text: formatHitToText(hit),
});
}

return { content };
},
);
}

/**
* Extracts the content of the `<body>` element from an HTML string.
*
* @param html The HTML content of a page.
* @returns The content of the `<body>` element, or `undefined` if not found.
*/
function extractBodyContent(html: string): string | undefined {
// TODO: Use '<main>' element instead of '<body>' when available in angular.dev HTML.
const mainTagStart = html.indexOf('<body');
if (mainTagStart === -1) {
return undefined;
}

const mainTagEnd = html.lastIndexOf('</body>');
if (mainTagEnd <= mainTagStart) {
return undefined;
}

// Add 7 to include '</body>'
return html.substring(mainTagStart, mainTagEnd + 7);
}

/**
* Formats an Algolia search hit into a text representation.
*
* @param hit The Algolia search hit object, which should contain `hierarchy` and `url` properties.
* @returns A formatted string with title, description, and URL.
*/
function formatHitToText(hit: Record<string, unknown>): string {
// eslint-disable-next-line @typescript-eslint/no-explicit-any
const hierarchy = Object.values(hit.hierarchy as any).filter((x) => typeof x === 'string');
const title = hierarchy.pop();
const description = hierarchy.join(' > ');

return `## ${title}\n${description}\nURL: ${hit.url}`;
}

/**
* Creates the search arguments for an Algolia search.
*
Expand Down