From dd2b49f9547a45cfc5c7bbc052030261b3dfb7ef Mon Sep 17 00:00:00 2001 From: George Pickett Date: Mon, 21 Sep 2026 17:05:47 -0700 Subject: [PATCH] Add Parallel as a search option --- README.md | 8 + bun.lock | 186 ++++++++++++++++++ packages/core/package.json | 1 + packages/core/src/commands/executor.ts | 15 +- .../core/src/commands/parallel-search.test.ts | 120 +++++++++++ packages/core/src/commands/parallel-search.ts | 128 ++++++++++++ packages/core/src/commands/types.ts | 2 +- 7 files changed, 457 insertions(+), 3 deletions(-) create mode 100644 packages/core/src/commands/parallel-search.test.ts create mode 100644 packages/core/src/commands/parallel-search.ts diff --git a/README.md b/README.md index da29a7a..eb8c131 100644 --- a/README.md +++ b/README.md @@ -43,6 +43,14 @@ bun run open-browser run "Find the top story on Hacker News and summarize it" bun run open-browser interactive ``` +## Web search + +The agent's `search` action accepts `engine: "google"`, `"duckduckgo"`, `"bing"`, or `"parallel"`. Google remains the default when `engine` is omitted. The separate `web_search` action also continues to use Google. + +`{"action":"search","query":"latest TypeScript release","engine":"parallel"}` uses [Parallel's free Search MCP](https://docs.parallel.ai/integrations/mcp/search-mcp) over Streamable HTTP. It needs no Parallel account or API key. The action returns up to five results with source URLs and excerpts in the agent's command result; it does not navigate the browser. Free access is rate limited. The query and an objective based on it are sent to Parallel, and the MCP request identifies this project as `open-browser/` for aggregate usage measurement. Browser cookies and page content are not sent. URL restrictions also apply to the MCP endpoint; any `allowedUrls` configuration must allow `https://search.parallel.ai/mcp` to use this engine. Search results themselves are not filtered by `allowedUrls` or `blockedUrls`. + +The other search engines navigate the browser as before. `parallel` is an explicit choice; existing search behavior is unchanged unless it is selected. + ## Architecture Open Browser is a monorepo with three packages: diff --git a/bun.lock b/bun.lock index eab9ef4..af4c533 100644 --- a/bun.lock +++ b/bun.lock @@ -1,5 +1,6 @@ { "lockfileVersion": 1, + "configVersion": 0, "workspaces": { "": { "name": "open-browser-monorepo", @@ -28,6 +29,7 @@ "@ai-sdk/anthropic": "^1.1.0", "@ai-sdk/google": "^1.1.0", "@ai-sdk/openai": "^1.1.0", + "@modelcontextprotocol/sdk": "^1.30.0", "ai": "^4.2.0", "dotenv": "^16.5.0", "mitt": "^3.0.1", @@ -90,8 +92,12 @@ "@biomejs/cli-win32-x64": ["@biomejs/cli-win32-x64@1.9.4", "", { "os": "win32", "cpu": "x64" }, "sha512-8Y5wMhVIPaWe6jw2H+KlEm4wP/f7EW3810ZLmDlrEEy5KvBsb9ECEfu/kMWD484ijfQ8+nIi0giMgu9g1UAuuA=="], + "@hono/node-server": ["@hono/node-server@2.1.1", "", { 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searchParallel } from './parallel-search.js'; export interface CommandExecutorOptions { model?: LanguageModel; @@ -560,15 +561,25 @@ export class CommandExecutor { // Search page (multi-engine) this.registry.register({ name: 'search', - description: 'Search the web using a specified search engine', + description: 'Search the web using Google, DuckDuckGo, Bing, or Parallel. Parallel returns cited results without navigating the browser.', schema: SearchCommandSchema.omit({ action: true }), handler: async (params, ctx) => { const { query, engine } = params as { query: string; - engine?: 'google' | 'duckduckgo' | 'bing'; + engine?: 'google' | 'duckduckgo' | 'bing' | 'parallel'; }; const searchEngine = engine ?? 'google'; + if (searchEngine === 'parallel') { + if (!isUrlPermitted(PARALLEL_SEARCH_MCP_URL, this.allowedUrls, this.blockedUrls)) { + throw new UrlBlockedError(PARALLEL_SEARCH_MCP_URL); + } + return { + success: true, + extractedContent: await searchParallel(query), + includeInMemory: true, + }; + } const url = buildSearchUrl(query, searchEngine); if (!isUrlPermitted(url, this.allowedUrls, this.blockedUrls)) { diff --git a/packages/core/src/commands/parallel-search.test.ts b/packages/core/src/commands/parallel-search.test.ts new file mode 100644 index 0000000..e897eca --- /dev/null +++ b/packages/core/src/commands/parallel-search.test.ts @@ -0,0 +1,120 @@ +import { afterEach, describe, expect, test } from 'bun:test'; +import { CommandExecutor } from './executor.js'; +import type { Command, ExecutionContext } from './types.js'; + +const originalFetch = globalThis.fetch; +afterEach(() => { + globalThis.fetch = originalFetch; +}); + +function context(): ExecutionContext { + return { + browserSession: { + navigate: () => { + throw new Error('Unexpected navigation'); + }, + } as unknown as ExecutionContext['browserSession'], + } as ExecutionContext; +} + +function mcpResponse(id: number, result: unknown): Response { + return Response.json( + { jsonrpc: '2.0', id, result }, + { + headers: { 'content-type': 'application/json' }, + }, + ); +} + +describe('Parallel search action', () => { + test('uses the MCP tool and returns bounded, cited results without navigation', async () => { + const requests: Array<{ method: string; userAgent: string | null; body: any }> = []; + globalThis.fetch = (async (input: RequestInfo | URL, init?: RequestInit) => { + const body = JSON.parse(String(init?.body)); + requests.push({ method: init?.method ?? '', userAgent: new Headers(init?.headers).get('user-agent'), body }); + if (body.method === 'initialize') { + return mcpResponse(body.id, { + protocolVersion: '2025-06-18', + capabilities: { tools: {} }, + serverInfo: { name: 'fixture', version: '1' }, + }); + } + if (body.method === 'notifications/initialized') return new Response(null, { status: 202 }); + if (body.method === 'tools/call') { + return mcpResponse(body.id, { + content: [{ type: 'text', text: 'duplicate representation' }], + structuredContent: { + results: [{ url: 'https://example.com/source', title: 'A useful source', excerpts: ['A source excerpt'] }], + warnings: [{ type: 'query_adjusted', message: 'Query shortened', detail: { original_length: 300 } }], + }, + }); + } + throw new Error(`Unexpected MCP method ${body.method}`); + }) as unknown as typeof fetch; + + const result = await new CommandExecutor().executeAction( + { action: 'search', query: 'test query', engine: 'parallel' } as Command, + context(), + ); + expect(result.success).toBe(true); + expect(result.extractedContent).toContain('A useful source'); + expect(result.extractedContent).toContain('https://example.com/source'); + expect(result.extractedContent).toContain('A source excerpt'); + expect(result.extractedContent).toContain('query_adjusted: Query shortened'); + expect(result.extractedContent).not.toContain('duplicate representation'); + expect(requests.some((request) => request.body.method === 'tools/call')).toBe(true); + const call = requests.find((request) => request.body.method === 'tools/call'); + expect(call?.body.params.name).toBe('web_search'); + expect(call?.body.params.arguments.search_queries).toEqual(['test query']); + expect(call?.body.params.arguments.objective).toContain('test query'); + expect(requests.every((request) => request.userAgent === 'open-browser/1.1.0')).toBe(true); + expect(requests.every((request) => request.method === 'POST')).toBe(true); + }); + + test('preserves MCP tool errors as failures', async () => { + globalThis.fetch = (async (_input, init) => { + const body = JSON.parse(String(init?.body)); + if (body.method === 'initialize') + return mcpResponse(body.id, { + protocolVersion: '2025-06-18', + capabilities: { tools: {} }, + serverInfo: { name: 'fixture', version: '1' }, + }); + if (body.method === 'notifications/initialized') return new Response(null, { status: 202 }); + return mcpResponse(body.id, { isError: true, content: [{ type: 'text', text: 'Rate limited' }] }); + }) as typeof fetch; + await expect( + new CommandExecutor().executeAction( + { action: 'search', query: 'test query', engine: 'parallel' } as Command, + context(), + ), + ).rejects.toThrow('Rate limited'); + }); + + test('rejects redirects before sending the query to another origin', async () => { + const requestedUrls: string[] = []; + globalThis.fetch = (async (input) => { + requestedUrls.push(String(input)); + return new Response(null, { status: 302, headers: { location: 'https://example.com/' } }); + }) as typeof fetch; + await expect( + new CommandExecutor().executeAction( + { action: 'search', query: 'test query', engine: 'parallel' } as Command, + context(), + ), + ).rejects.toThrow('redirected'); + expect(requestedUrls).toEqual(['https://search.parallel.ai/mcp']); + }); + + test('honors URL restrictions before making a third-party request', async () => { + globalThis.fetch = (async (_input: RequestInfo | URL, _init?: RequestInit) => { + throw new Error('Unexpected request'); + }) as unknown as typeof fetch; + await expect( + new CommandExecutor({ allowedUrls: ['example.com'] }).executeAction( + { action: 'search', query: 'test query', engine: 'parallel' } as Command, + context(), + ), + ).rejects.toThrow('search.parallel.ai'); + }); +}); diff --git a/packages/core/src/commands/parallel-search.ts b/packages/core/src/commands/parallel-search.ts new file mode 100644 index 0000000..bf6615b --- /dev/null +++ b/packages/core/src/commands/parallel-search.ts @@ -0,0 +1,128 @@ +import { readFileSync } from 'node:fs'; +import { Client } from '@modelcontextprotocol/sdk/client/index.js'; +import { StreamableHTTPClientTransport } from '@modelcontextprotocol/sdk/client/streamableHttp.js'; +import { CallToolResultSchema } from '@modelcontextprotocol/sdk/types.js'; +import { z } from 'zod'; + +export const PARALLEL_SEARCH_MCP_URL = 'https://search.parallel.ai/mcp'; +const ENDPOINT = new URL(PARALLEL_SEARCH_MCP_URL); +const MAX_RESPONSE_BYTES = 1_000_000; +const REQUEST_TIMEOUT_MS = 20_000; +const PACKAGE_VERSION = JSON.parse(readFileSync(new URL('../../package.json', import.meta.url), 'utf8')) + .version as string; + +const SearchPayload = z.object({ + results: z.array( + z.object({ + url: z.string().url().max(2048), + title: z.string().nullish(), + excerpts: z.array(z.string()), + }), + ), + warnings: z + .array( + z.union([ + z.string(), + z.object({ type: z.string(), message: z.string(), detail: z.record(z.unknown()).nullish() }), + ]), + ) + .nullish(), +}); + +/** Search through Parallel's anonymous Search MCP, returning bounded, cited text. */ +export async function searchParallel(query: string): Promise { + const searchQuery = query.trim(); + if (!searchQuery || searchQuery.length > 200) { + throw new Error('Parallel search query must contain 1 to 200 characters'); + } + + const transport = new StreamableHTTPClientTransport(ENDPOINT, { + // Identify this project for aggregate free MCP usage without user identifiers. + requestInit: { headers: { 'User-Agent': `open-browser/${PACKAGE_VERSION}` } }, + fetch: boundedFetch, + }); + const client = new Client({ name: 'open-browser', version: PACKAGE_VERSION }); + + try { + await client.connect(transport); + const result = CallToolResultSchema.parse( + await client.callTool( + { + name: 'web_search', + arguments: { + objective: `Find current web information about ${searchQuery}`, + search_queries: [searchQuery], + }, + }, + undefined, + { timeout: REQUEST_TIMEOUT_MS }, + ), + ); + if (result.isError) { + const detail = result.content.find((item) => item.type === 'text'); + throw new Error(`Parallel search failed: ${detail?.type === 'text' ? detail.text.slice(0, 300) : 'tool error'}`); + } + + const textContent = result.content.find((item) => item.type === 'text'); + const raw = result.structuredContent ?? (textContent?.type === 'text' ? JSON.parse(textContent.text) : undefined); + const payload = SearchPayload.parse(raw); + const lines = payload.results.slice(0, 5).map((item, index) => { + const excerpts = item.excerpts.join(' ').trim(); + return `${index + 1}. ${item.title?.slice(0, 200) || item.url}\n${item.url}\n${excerpts.slice(0, 700) || 'No excerpt available.'}${excerpts.length > 700 ? ' [excerpt shortened]' : ''}`; + }); + if (lines.length === 0) lines.push('No results found.'); + if (payload.results.length > 5) lines.push('Additional results omitted.'); + if (payload.warnings?.length) { + const warnings = payload.warnings.map((warning) => + typeof warning === 'string' ? warning : `${warning.type}: ${warning.message}`, + ); + lines.push(`Warnings: ${warnings.join('; ').slice(0, 500)}`); + } + return lines.join('\n\n'); + } finally { + if (transport.sessionId) await transport.terminateSession().catch(() => {}); + await client.close().catch(() => {}); + } +} + +async function boundedFetch(input: RequestInfo | URL, init?: RequestInit): Promise { + const requestedUrl = new URL(input instanceof Request ? input.url : String(input)); + if (requestedUrl.href !== ENDPOINT.href) { + throw new Error('Parallel MCP request left the configured endpoint'); + } + const response = await fetch(input, { + ...init, + redirect: 'manual', + signal: AbortSignal.any( + [init?.signal, AbortSignal.timeout(REQUEST_TIMEOUT_MS)].filter((signal): signal is AbortSignal => signal != null), + ), + }); + if (response.status >= 300 && response.status < 400) { + await response.body?.cancel(); + throw new Error('Parallel MCP redirected outside its fixed endpoint'); + } + const contentLength = Number(response.headers.get('content-length')); + if (contentLength > MAX_RESPONSE_BYTES) { + await response.body?.cancel(); + throw new Error('Parallel MCP response exceeded the size limit'); + } + if (!response.body) return response; + let bytes = 0; + const body = response.body.pipeThrough( + new TransformStream({ + transform(chunk, controller) { + bytes += chunk.byteLength; + if (bytes > MAX_RESPONSE_BYTES) { + controller.error(new Error('Parallel MCP response exceeded the size limit')); + return; + } + controller.enqueue(chunk); + }, + }), + ); + return new Response(body, { + status: response.status, + statusText: response.statusText, + headers: response.headers, + }); +} diff --git a/packages/core/src/commands/types.ts b/packages/core/src/commands/types.ts index 12f99a2..15e762d 100644 --- a/packages/core/src/commands/types.ts +++ b/packages/core/src/commands/types.ts @@ -112,7 +112,7 @@ export const FindCommandSchema = z.object({ export const SearchCommandSchema = z.object({ action: z.literal('search'), query: z.string().describe('Search query'), - engine: z.enum(['google', 'duckduckgo', 'bing']).optional().default('google'), + engine: z.enum(['google', 'duckduckgo', 'bing', 'parallel']).optional().default('google'), }); export const ListOptionsCommandSchema = z.object({