diff --git a/CHANGELOG.md b/CHANGELOG.md
index f574f85..342d6c3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- Optional `youcom_search` tool — You.com web search provider alongside exa_search/firecrawl_search, opt-in via `YDC_API_KEY`
 - Server-side Composio session proxy — CLI fetches composio MCP session from Render server's env var instead of requiring local `COMPOSIO_API_KEY` in `.env`
 - New `POST /api/composio/session` backend endpoint authenticated via bearer token
 - `createSessionFromServer()` method on `ComposioSessionManager` — fallback chain: server proxy → local SDK → user prompt
diff --git a/apps/supercode-cli/server/.env.example b/apps/supercode-cli/server/.env.example
index 2050ec0..2cf7280 100644
--- a/apps/supercode-cli/server/.env.example
+++ b/apps/supercode-cli/server/.env.example
@@ -80,6 +80,10 @@ GOOGLE_CSE_ID=""
 # Firecrawl
 FIRECRAWL_API_KEY=""
 
+# You.com — ⚪ Optional, enables the `youcom_search` tool when set
+# https://you.com/platform/api-keys
+YDC_API_KEY=""
+
 # ─── Voice / Speech-to-Text (STT) ──────────────
 # Used by the CLI voice capture and POST /api/voice/transcribe.
 # Voice capture uses Smallest.ai (Pulse STT) exclusively.
diff --git a/apps/supercode-cli/server/src/agents/tools/registry.ts b/apps/supercode-cli/server/src/agents/tools/registry.ts
index 2f98e27..975a7d5 100644
--- a/apps/supercode-cli/server/src/agents/tools/registry.ts
+++ b/apps/supercode-cli/server/src/agents/tools/registry.ts
@@ -16,6 +16,7 @@ import { firecrawlScrapeTool } from "./firecrawl_scrape.ts"
 import { firecrawlMapTool } from "./firecrawl_map.ts"
 import { exaSearchTool } from "./exa_search.ts"
 import { exaFetchTool } from "./exa_fetch.ts"
+import { youcomSearchTool } from "./youcom_search.ts"
 import { codeExecTool } from "./code_exec.ts"
 import { readInstructionsTool } from "./read_instructions.ts"
 import { switchToAgentModeTool } from "./switch_to_agent_mode.ts"
@@ -63,6 +64,7 @@ export const toolMeta: Record<string, ToolMeta> = {
   firecrawl_map: { category: "web", requiresPermission: false, description: firecrawlMapTool.description },
   exa_search: { category: "web", requiresPermission: false, description: exaSearchTool.description },
   exa_fetch: { category: "web", requiresPermission: false, description: exaFetchTool.description },
+  youcom_search: { category: "web", requiresPermission: false, description: youcomSearchTool.description },
   code_exec: { category: "execute", requiresPermission: true, description: codeExecTool.description },
   read_instructions: { category: "read", requiresPermission: false, description: readInstructionsTool.description },
   switch_to_agent_mode: { category: "agent", requiresPermission: false, description: switchToAgentModeTool.description },
@@ -90,6 +92,7 @@ export const tools: Record<string, unknown> = {
   firecrawl_map: asSdk(firecrawlMapTool),
   exa_search: asSdk(exaSearchTool),
   exa_fetch: asSdk(exaFetchTool),
+  youcom_search: asSdk(youcomSearchTool),
   code_exec: withPermissionSdk("code_exec", codeExecTool),
   read_instructions: asSdk(readInstructionsTool),
   switch_to_agent_mode: asSdk(switchToAgentModeTool),
diff --git a/apps/supercode-cli/server/src/agents/tools/youcom_search.ts b/apps/supercode-cli/server/src/agents/tools/youcom_search.ts
new file mode 100644
index 0000000..b1b8d55
--- /dev/null
+++ b/apps/supercode-cli/server/src/agents/tools/youcom_search.ts
@@ -0,0 +1,62 @@
+import { z } from "zod"
+import { youcomFetch } from "../../lib/youcom"
+import { serialize, ok, fail } from "../../cli/ai/tool-result"
+import { defineTool } from "../lib/define.ts"
+
+const youcomSearchSchema = z.object({
+  query: z.string().min(1).describe("Search query"),
+  maxResults: z.number().int().min(1).max(20).optional().default(5).describe("Maximum number of search results to return (1-20)"),
+})
+
+export type YoucomSearchArgs = z.infer<typeof youcomSearchSchema>
+
+function mapYoucomResults(data: any, maxResults: number) {
+  const results = data?.results
+  const webResults = Array.isArray(results?.web) ? results.web : []
+  const newsResults = Array.isArray(results?.news) ? results.news : []
+  const flat = [...webResults, ...newsResults]
+  return flat.slice(0, maxResults).map((item: any) => ({
+    title: String(item.title ?? ""),
+    snippet: String(item.description ?? item.snippet ?? ""),
+    link: String(item.url ?? ""),
+    publishedDate: item.published_date ?? item.publishedDate ?? null,
+  }))
+}
+
+const _def = {
+  description:
+    "Search the web using the You.com Search API. " +
+    "Returns relevant results with titles, snippets, and URLs. " +
+    "Best for finding current information, news, documentation, and any topic the user asks about. " +
+    "Returns a structured result: { success: true, data: { query, results: [...], provider } } with title/snippet/link, " +
+    "or { success: false, error } when search is unavailable. " +
+    "If success is false, do NOT invent search results — relay the error to the user.",
+  inputSchema: youcomSearchSchema,
+  execute: async (input: YoucomSearchArgs, ctx?: { signal?: AbortSignal }) => {
+    const { query, maxResults } = youcomSearchSchema.parse(input)
+    return serialize(async () => {
+      const resp = await youcomFetch({
+        apiPath: "/v1/search",
+        body: { query, count: maxResults },
+        timeout: 30000,
+        signal: ctx?.signal,
+      })
+
+      if (resp.ok) {
+        return ok({
+          query,
+          provider: "youcom",
+          results: mapYoucomResults(resp.data, maxResults),
+        })
+      }
+
+      return fail(
+        `Web search failed via You.com: ${resp.error}`,
+        resp.hint ?? "Set a valid YDC_API_KEY, or use exa_search / firecrawl_search instead.",
+      )
+    })
+  },
+}
+
+export const youcomSearchTool = defineTool(_def)
+export default youcomSearchTool
diff --git a/apps/supercode-cli/server/src/cli/ai/chat/lib/tools-for-turn.ts b/apps/supercode-cli/server/src/cli/ai/chat/lib/tools-for-turn.ts
index 2096357..2ebd12e 100644
--- a/apps/supercode-cli/server/src/cli/ai/chat/lib/tools-for-turn.ts
+++ b/apps/supercode-cli/server/src/cli/ai/chat/lib/tools-for-turn.ts
@@ -36,12 +36,21 @@ export async function buildToolsForTurn(
   // missing/invalid the tools fall back to the authenticated server proxy and
   // cross-provider search fallback (Exa ↔ Firecrawl).
 
+  // You.com search is strictly opt-in: only expose the tool when YDC_API_KEY
+  // is set, so existing users see no change.
+  if (!process.env.YDC_API_KEY) {
+    delete toolsToUse.youcom_search
+  }
+
   const preferenceHints: string[] = []
 
   preferenceHints.push(
     "For general web search, prefer `exa_search` (Exa). " +
       "If Exa fails, it automatically falls back to Firecrawl. " +
       "You may also call `firecrawl_search` directly. " +
+      (process.env.YDC_API_KEY
+        ? "`youcom_search` (You.com) is also available as an additional search provider. "
+        : "") +
       "Use `firecrawl_scrape` when the user asks for deep websearch or webscraping " +
       "(extracting full page content, following links, or fetching structured data from a page). " +
       "Use `firecrawl_map` to discover URLs on a site. " +
diff --git a/apps/supercode-cli/server/src/cli/ai/tool-result.ts b/apps/supercode-cli/server/src/cli/ai/tool-result.ts
index 9215c09..eccb757 100644
--- a/apps/supercode-cli/server/src/cli/ai/tool-result.ts
+++ b/apps/supercode-cli/server/src/cli/ai/tool-result.ts
@@ -9,6 +9,7 @@ const EMPTY_SENTINEL_GUARDED = new Set([
   "web_search",
   "firecrawl_search",
   "exa_search",
+  "youcom_search",
   "read_file",
   "search_files",
   "read_instructions",
diff --git a/apps/supercode-cli/server/src/lib/youcom.ts b/apps/supercode-cli/server/src/lib/youcom.ts
new file mode 100644
index 0000000..f4a8410
--- /dev/null
+++ b/apps/supercode-cli/server/src/lib/youcom.ts
@@ -0,0 +1,2 @@
+/** Re-export shim — implementation in `src/runtime/research/youcom.ts`. */
+export * from "../runtime/research/youcom.ts"
diff --git a/apps/supercode-cli/server/src/runtime/research/search.test.ts b/apps/supercode-cli/server/src/runtime/research/search.test.ts
index c419e2b..eba36f2 100644
--- a/apps/supercode-cli/server/src/runtime/research/search.test.ts
+++ b/apps/supercode-cli/server/src/runtime/research/search.test.ts
@@ -2,15 +2,19 @@ import { afterEach, beforeEach, expect, test } from "bun:test"
 import { exaSearchTool } from "../../agents/tools/exa_search"
 import { firecrawlSearchTool } from "../../agents/tools/firecrawl_search"
 import { webSearchTool } from "../../agents/tools/web_search"
+import { youcomSearchTool } from "../../agents/tools/youcom_search"
 
 const originalFetch = globalThis.fetch
 let exaKey: string | undefined
 let firecrawlKey: string | undefined
+let ydcKey: string | undefined
 beforeEach(() => {
   exaKey = process.env.EXA_API_KEY
   firecrawlKey = process.env.FIRECRAWL_API_KEY
+  ydcKey = process.env.YDC_API_KEY
   process.env.EXA_API_KEY = "test-only-placeholder"
   process.env.FIRECRAWL_API_KEY = "test-only-placeholder"
+  process.env.YDC_API_KEY = "test-only-placeholder"
 })
 afterEach(() => {
   globalThis.fetch = originalFetch
@@ -18,6 +22,8 @@ afterEach(() => {
   else process.env.EXA_API_KEY = exaKey
   if (firecrawlKey === undefined) delete process.env.FIRECRAWL_API_KEY
   else process.env.FIRECRAWL_API_KEY = firecrawlKey
+  if (ydcKey === undefined) delete process.env.YDC_API_KEY
+  else process.env.YDC_API_KEY = ydcKey
 })
 const parse = (value: unknown) => JSON.parse(String(value))
 
@@ -56,3 +62,34 @@ test("malformed responses fail while valid empty results remain empty", async ()
   expect(empty.success).toBe(true)
   expect(empty.data.results).toEqual([])
 })
+
+test("youcom_search maps results and reports provider", async () => {
+  let hitUrl: string | undefined
+  let hitBody: any
+  globalThis.fetch = (async (url: string | URL | Request, options?: RequestInit) => {
+    hitUrl = String(url)
+    hitBody = JSON.parse(String(options?.body))
+    return Response.json({ results: { web: [{ title: "Docs", url: "https://example.com/docs", description: "Official fixture" }] } })
+  }) as typeof fetch
+  const result = parse(await youcomSearchTool.execute({ query: "fixture docs", maxResults: 3 }))
+  expect(result.success).toBe(true)
+  expect(result.data.provider).toBe("youcom")
+  expect(result.data.results[0].link).toBe("https://example.com/docs")
+  expect(hitUrl).toContain("api.ydc-index.io/v1/search")
+  expect(hitBody.count).toBe(3)
+})
+
+test("youcom_search fails cleanly without YDC_API_KEY", async () => {
+  delete process.env.YDC_API_KEY
+  const result = parse(await youcomSearchTool.execute({ query: "fixture" }))
+  expect(result.success).toBe(false)
+  expect(result.error).toContain("YDC_API_KEY")
+  expect(result.hint).toContain("exa_search")
+})
+
+test("youcom_search surfaces auth failures with a hint", async () => {
+  globalThis.fetch = Object.assign(async () => new Response("unauthorized", { status: 401 }), { preconnect: originalFetch.preconnect })
+  const result = parse(await youcomSearchTool.execute({ query: "fixture" }))
+  expect(result.success).toBe(false)
+  expect(result.hint).toContain("YDC_API_KEY")
+})
diff --git a/apps/supercode-cli/server/src/runtime/research/youcom.ts b/apps/supercode-cli/server/src/runtime/research/youcom.ts
new file mode 100644
index 0000000..ea24983
--- /dev/null
+++ b/apps/supercode-cli/server/src/runtime/research/youcom.ts
@@ -0,0 +1,111 @@
+import { loadEnvOnce } from "../config/load-env"
+
+const YOUCOM_BASE = "https://api.ydc-index.io"
+
+export interface YoucomOptions {
+  apiPath: string
+  body: Record<string, unknown>
+  timeout?: number
+  /** Optional caller-provided abort signal (e.g. the tool execution signal); combined with the timeout. */
+  signal?: AbortSignal
+}
+
+export interface YoucomResult {
+  ok: boolean
+  data?: any
+  error?: string
+  hint?: string
+  status?: number
+}
+
+function statusHint(status: number): string | undefined {
+  if (status === 429) return "Rate limited. Try again later."
+  if (status === 401 || status === 403) return "Invalid YDC_API_KEY. Check your You.com API key."
+  return undefined
+}
+
+/** Combine an optional external signal with a timeout, following the AbortController pattern used across the repo. */
+function withTimeoutSignal(timeout: number, signal?: AbortSignal): { signal: AbortSignal; cleanup: () => void } {
+  const controller = new AbortController()
+  const timer = setTimeout(() => controller.abort(), timeout)
+  const onAbort = () => controller.abort()
+  if (signal) {
+    if (signal.aborted) controller.abort()
+    else signal.addEventListener("abort", onAbort)
+  }
+  return {
+    signal: controller.signal,
+    cleanup: () => {
+      clearTimeout(timer)
+      if (signal) signal.removeEventListener("abort", onAbort)
+    },
+  }
+}
+
+export function youcomFetch({
+  apiPath,
+  body,
+  timeout = 30000,
+  signal,
+}: YoucomOptions): Promise<YoucomResult> {
+  loadEnvOnce()
+  const apiKey = process.env.YDC_API_KEY
+
+  if (!apiKey) {
+    return Promise.resolve({
+      ok: false,
+      error: "YDC_API_KEY is not set",
+      hint: "Set YDC_API_KEY to use youcom_search, or use exa_search / firecrawl_search instead.",
+    })
+  }
+
+  return callYoucomDirect(apiKey, apiPath, body, timeout, signal)
+}
+
+async function callYoucomDirect(
+  apiKey: string,
+  apiPath: string,
+  body: Record<string, unknown>,
+  timeout: number,
+  signal?: AbortSignal,
+): Promise<YoucomResult> {
+  const timeoutSignal = withTimeoutSignal(timeout, signal)
+  try {
+    const res = await fetch(`${YOUCOM_BASE}${apiPath}`, {
+      method: "POST",
+      headers: {
+        "X-API-Key": apiKey,
+        "Content-Type": "application/json",
+      },
+      body: JSON.stringify(body),
+      signal: timeoutSignal.signal,
+    })
+
+    const data = await res.json().catch(() => ({}))
+
+    if (!res.ok) {
+      return {
+        ok: false,
+        error: `You.com returned HTTP ${res.status}`,
+        hint: statusHint(res.status),
+        status: res.status,
+      }
+    }
+
+    const results = data?.results
+    const hasWebOrNews = Array.isArray(results?.web) || Array.isArray(results?.news)
+    if (!data || typeof data !== "object" || (apiPath === "/v1/search" && !hasWebOrNews)) {
+      return { ok: false, error: "You.com returned a malformed response" }
+    }
+    return { ok: true, data }
+  } catch (err: any) {
+    const isTimeout = err?.name === "TimeoutError" || err?.name === "AbortError"
+    return {
+      ok: false,
+      error: isTimeout ? "Request timed out" : (err.message || String(err)),
+      hint: isTimeout ? "You.com API may be slow or unreachable. Try exa_search, firecrawl_search, or url_fetch instead." : undefined,
+    }
+  } finally {
+    timeoutSignal.cleanup()
+  }
+}
diff --git a/apps/supercode-cli/server/src/tools/definitions/youcom-search.ts b/apps/supercode-cli/server/src/tools/definitions/youcom-search.ts
new file mode 100644
index 0000000..881e852
--- /dev/null
+++ b/apps/supercode-cli/server/src/tools/definitions/youcom-search.ts
@@ -0,0 +1,3 @@
+/** @deprecated use src/agents/tools/youcom_search.ts */
+export { youcomSearchTool } from "src/agents/tools/youcom_search.ts"
+export { default } from "src/agents/tools/youcom_search.ts"