diff --git a/packages/app-bundle/overlay/packages/app/src/components/settings-v2/data-storage-controller.ts b/packages/app-bundle/overlay/packages/app/src/components/settings-v2/data-storage-controller.ts
index f23ff832..f090147d 100644
--- a/packages/app-bundle/overlay/packages/app/src/components/settings-v2/data-storage-controller.ts
+++ b/packages/app-bundle/overlay/packages/app/src/components/settings-v2/data-storage-controller.ts
@@ -13,6 +13,7 @@ export interface DataStorageStatus {
 export interface DataStorageDefaults {
   databasePath: string
   configDir: string
+  recapWindowDays: number
 }
 
 export function createDataStorageController() {
@@ -43,6 +44,7 @@ export function createDataStorageController() {
       setDefaults({
         databasePath: typeof d.databasePath === "string" ? d.databasePath : "",
         configDir: typeof d.configDir === "string" ? d.configDir : "",
+        recapWindowDays: typeof d.recapWindowDays === "number" ? d.recapWindowDays : 7,
       })
     }
 
@@ -74,6 +76,7 @@ export function createDataStorageController() {
         kind: "data-storage-update",
         databasePath: settings.storage.databasePath(),
         configDir: settings.storage.configDir(),
+        recapWindowDays: settings.storage.recapWindowDays(),
       },
       "*",
     )
@@ -88,9 +91,14 @@ export function createDataStorageController() {
     setConfigDir: (value: string) => {
       settings.storage.setConfigDir(value)
     },
+    recapWindowDays: settings.storage.recapWindowDays,
+    setRecapWindowDays: (value: number) => {
+      settings.storage.setRecapWindowDays(value)
+    },
     /** Trigger validation + apply on blur */
     commitDatabasePath: () => sendUpdate(),
     commitConfigDir: () => sendUpdate(),
+    commitRecapWindowDays: () => sendUpdate(),
     status,
     defaults,
     pending,
diff --git a/packages/app-bundle/overlay/packages/app/src/components/settings-v2/data-storage.tsx b/packages/app-bundle/overlay/packages/app/src/components/settings-v2/data-storage.tsx
index 430e3a3d..63d7ceb4 100644
--- a/packages/app-bundle/overlay/packages/app/src/components/settings-v2/data-storage.tsx
+++ b/packages/app-bundle/overlay/packages/app/src/components/settings-v2/data-storage.tsx
@@ -79,6 +79,27 @@ const DataStorageContent: Component<{ controller: DataStorageController }> = (pr
           />
         </div>
       </SettingsRowV2>
+
+      <SettingsRowV2
+        title={language.t("settings.general.row.dataStorage.recapWindow.title")}
+        description={language.t("settings.general.row.dataStorage.recapWindow.description")}
+      >
+        <div class="w-full sm:w-[100px]">
+          <TextInputV2
+            data-action="settings-data-storage-recap-window"
+            type="number"
+            appearance="base"
+            value={String(props.controller.recapWindowDays())}
+            onInput={(event) => {
+              const v = Number(event.currentTarget.value)
+              if (Number.isFinite(v) && v >= 1) props.controller.setRecapWindowDays(v)
+            }}
+            onBlur={() => props.controller.commitRecapWindowDays()}
+            placeholder={String(props.controller.defaults()?.recapWindowDays ?? 7)}
+            aria-label={language.t("settings.general.row.dataStorage.recapWindow.title")}
+          />
+        </div>
+      </SettingsRowV2>
     </SettingsListV2>
   )
 }
diff --git a/packages/app-bundle/overlay/packages/app/src/context/settings.tsx b/packages/app-bundle/overlay/packages/app/src/context/settings.tsx
index 299cbc27..f9899484 100644
--- a/packages/app-bundle/overlay/packages/app/src/context/settings.tsx
+++ b/packages/app-bundle/overlay/packages/app/src/context/settings.tsx
@@ -49,6 +49,7 @@ export interface Settings {
   storage: {
     databasePath: string
     configDir: string
+    recapWindowDays: number
   }
   developer: {
     enabled: boolean
@@ -214,6 +215,7 @@ const defaultSettings: Settings = {
   storage: {
     databasePath: "",
     configDir: "",
+    recapWindowDays: 7,
   },
   developer: {
     enabled: false,
@@ -560,6 +562,10 @@ export const { use: useSettings, provider: SettingsProvider } = createSimpleCont
         setConfigDir(value: string) {
           setStore("storage", "configDir", value)
         },
+        recapWindowDays: withFallback(() => store.storage?.recapWindowDays, defaultSettings.storage.recapWindowDays),
+        setRecapWindowDays(value: number) {
+          setStore("storage", "recapWindowDays", value)
+        },
       },
       developer: {
         enabled: withFallback(() => store.developer?.enabled, defaultSettings.developer.enabled),
diff --git a/packages/app-bundle/overlay/packages/app/src/i18n/en.ts b/packages/app-bundle/overlay/packages/app/src/i18n/en.ts
index a12f75f8..897b66bd 100644
--- a/packages/app-bundle/overlay/packages/app/src/i18n/en.ts
+++ b/packages/app-bundle/overlay/packages/app/src/i18n/en.ts
@@ -1046,6 +1046,9 @@ export const dict = {
   "settings.general.row.dataStorage.configDir.description":
     "Override the opencode configuration directory. Leave empty to use the default location.",
   "settings.general.row.dataStorage.configDir.error.invalidPath": "Directory does not exist",
+  "settings.general.row.dataStorage.recapWindow.title": "Session recap window",
+  "settings.general.row.dataStorage.recapWindow.description":
+    "How many days of recent sessions to include in the context prompt. Requires a server restart to take effect.",
 
   "settings.general.row.releaseNotes.title": "Release notes",
   "settings.general.row.releaseNotes.description": "Show What's New popups after updates",
diff --git a/packages/extension/opencode-plugin/session_recap.ts b/packages/extension/opencode-plugin/session_recap.ts
index 762f8fca..6b0992f1 100644
--- a/packages/extension/opencode-plugin/session_recap.ts
+++ b/packages/extension/opencode-plugin/session_recap.ts
@@ -46,6 +46,16 @@ export const RECAP_WINDOW_DAYS = 7;
 export const MAX_RECAPS = 10;
 export const MIN_ASSISTANT_MESSAGES = 2;
 
+/** Resolve the effective recap window in days. Reads AMICODE_SESSION_RECAP_WINDOW_DAYS
+ *  from the environment; falls back to RECAP_WINDOW_DAYS if unset or invalid. */
+export function resolveWindowDays(): number {
+  const raw = process.env.AMICODE_SESSION_RECAP_WINDOW_DAYS;
+  if (raw == null || raw.trim() === "") return RECAP_WINDOW_DAYS;
+  const parsed = Number(raw);
+  if (!Number.isFinite(parsed) || parsed <= 0) return RECAP_WINDOW_DAYS;
+  return parsed;
+}
+
 // Titles that indicate noise sessions (internal housekeeping)
 export const NOISE_TITLE_PREFIXES = ["Compaction", "compaction"];
 
@@ -168,8 +178,9 @@ export function composeRecapText(userTexts: string[], outcomes: string[]): strin
 
 // ── Markdown composition (pure, testable) ────────────────────────────────────
 
-export function composeMarkdown(recaps: SessionRecap[]): string {
-  const lines = ["## Recent sessions (last 7 days)", ""];
+export function composeMarkdown(recaps: SessionRecap[], windowDays?: number): string {
+  const days = windowDays ?? resolveWindowDays();
+  const lines = [`## Recent sessions (last ${days} days)`, ""];
 
   for (const r of recaps) {
     const date = new Date(r.created);
@@ -263,7 +274,8 @@ export function buildRecentSessionsBlock(currentSessionId?: string): string | nu
   }
 
   try {
-    const cutoff = Date.now() - RECAP_WINDOW_DAYS * 24 * 60 * 60 * 1000;
+    const windowDays = resolveWindowDays();
+    const cutoff = Date.now() - windowDays * 24 * 60 * 60 * 1000;
 
     // Query recent sessions: non-subagent, non-archived, within window
     const sessions = db.prepare(`
@@ -320,7 +332,7 @@ export function buildRecentSessionsBlock(currentSessionId?: string): string | nu
 
     if (recaps.length === 0) return null;
 
-    return composeMarkdown(recaps);
+    return composeMarkdown(recaps, windowDays);
   } catch (e) {
     console.error(`[session-recap] failed: ${e instanceof Error ? e.message : String(e)}`);
     return null;
diff --git a/packages/extension/package.json b/packages/extension/package.json
index 9581e360..2dd7d9ff 100644
--- a/packages/extension/package.json
+++ b/packages/extension/package.json
@@ -251,6 +251,12 @@
           "default": "",
           "description": "Override the session database path. The value is injected as OPENCODE_DB into the spawned server process. Empty = opencode uses its XDG default (~/.local/share/opencode/opencode.db)."
         },
+        "amicode.sessionRecapWindowDays": {
+          "type": "number",
+          "default": 7,
+          "minimum": 1,
+          "description": "How many days of recent sessions to show in the context prompt. Injected as AMICODE_SESSION_RECAP_WINDOW_DAYS."
+        },
         "amicode.configDir": {
           "type": "string",
           "default": "",
diff --git a/packages/extension/src/chat_bridge.ts b/packages/extension/src/chat_bridge.ts
index d225030b..d6b3411b 100644
--- a/packages/extension/src/chat_bridge.ts
+++ b/packages/extension/src/chat_bridge.ts
@@ -727,6 +727,7 @@ export function handleAmicodeBridgeMessage(msg: unknown, io: BridgeIo): boolean
       kind: "data-storage-defaults",
       databasePath: shorten(defaultDbPath),
       configDir: shorten(defaultConfigDir),
+      recapWindowDays: 7,
       tab: msg.tab,
     });
     return true;
@@ -739,6 +740,9 @@ export function handleAmicodeBridgeMessage(msg: unknown, io: BridgeIo): boolean
     const configDir = typeof (msg as { configDir?: unknown }).configDir === "string"
       ? (msg as unknown as { configDir: string }).configDir.trim().replace(/^~/, os.homedir())
       : "";
+    const recapWindowDays = typeof (msg as { recapWindowDays?: unknown }).recapWindowDays === "number"
+      ? (msg as unknown as { recapWindowDays: number }).recapWindowDays
+      : 7;
 
     const reply: {
       source: "amicode"; kind: "data-storage-status"; tab?: string;
@@ -804,6 +808,12 @@ export function handleAmicodeBridgeMessage(msg: unknown, io: BridgeIo): boolean
         "configDir", configDir, vscode.ConfigurationTarget.Global,
       );
     }
+    // Recap window: always valid (clamped to >= 1 on the client side)
+    if (recapWindowDays >= 1) {
+      void vscode.workspace.getConfiguration("amicode").update(
+        "sessionRecapWindowDays", recapWindowDays, vscode.ConfigurationTarget.Global,
+      );
+    }
 
     // Restart the server so it picks up the new env vars
     if (reply.databaseValid && reply.configValid) {
diff --git a/packages/extension/src/extension.ts b/packages/extension/src/extension.ts
index f9cd058c..ff643e66 100644
--- a/packages/extension/src/extension.ts
+++ b/packages/extension/src/extension.ts
@@ -316,8 +316,10 @@ export async function activate(ctx: vscode.ExtensionContext): Promise<void> {
     const cfg = vscode.workspace.getConfiguration("amicode");
     const sessionDb = cfg.get<string>("sessionDatabase", "");
     const configDirOverride = cfg.get<string>("configDir", "");
+    const recapWindow = cfg.get<number>("sessionRecapWindowDays", 0);
     if (sessionDb) env.OPENCODE_DB = sessionDb;
     if (configDirOverride) env.OPENCODE_CONFIG_DIR = configDirOverride;
+    if (recapWindow > 0) env.AMICODE_SESSION_RECAP_WINDOW_DAYS = String(recapWindow);
     return (currentSpawnEnv = env);
   };
 
diff --git a/packages/extension/test/session_recap.test.ts b/packages/extension/test/session_recap.test.ts
index f312d383..a1d0ba06 100644
--- a/packages/extension/test/session_recap.test.ts
+++ b/packages/extension/test/session_recap.test.ts
@@ -19,6 +19,8 @@ import {
   readCachedRecap,
   writeCachedRecap,
   buildRecentSessionsBlock,
+  resolveWindowDays,
+  RECAP_WINDOW_DAYS,
   NOISE_TITLE_PREFIXES,
   MIN_ASSISTANT_MESSAGES,
   MAX_RECAPS,
@@ -167,7 +169,7 @@ describe("composeRecapText — recap string composition", () => {
 // ── composeMarkdown ──────────────────────────────────────────────────────────
 
 describe("composeMarkdown — final prompt section composition", () => {
-  it("starts with the heading", () => {
+  it("starts with the heading (default window)", () => {
     const recaps: SessionRecap[] = [{
       session_id: "ses_1",
       title: "Test",
@@ -179,6 +181,18 @@ describe("composeMarkdown — final prompt section composition", () => {
     expect(md.startsWith("## Recent sessions (last 7 days)")).toBe(true);
   });
 
+  it("heading reflects custom windowDays parameter", () => {
+    const recaps: SessionRecap[] = [{
+      session_id: "ses_1",
+      title: "Test",
+      created: "2026-08-23T10:30:00.000Z",
+      recap: "Did some stuff",
+      summarized_at: "2026-08-23T14:00:00.000Z",
+    }];
+    const md = composeMarkdown(recaps, 14);
+    expect(md.startsWith("## Recent sessions (last 14 days)")).toBe(true);
+  });
+
   it("renders date and time for each entry", () => {
     const recaps: SessionRecap[] = [{
       session_id: "ses_1",
@@ -278,6 +292,62 @@ describe("cache — read/write SessionRecap to disk", () => {
   });
 });
 
+// ── resolveWindowDays — env-configurable window ──────────────────────────────
+
+describe("resolveWindowDays — environment override of RECAP_WINDOW_DAYS", () => {
+  const origEnv = process.env.AMICODE_SESSION_RECAP_WINDOW_DAYS;
+
+  afterEach(() => {
+    if (origEnv === undefined) delete process.env.AMICODE_SESSION_RECAP_WINDOW_DAYS;
+    else process.env.AMICODE_SESSION_RECAP_WINDOW_DAYS = origEnv;
+  });
+
+  it("returns default (7) when env is unset", () => {
+    delete process.env.AMICODE_SESSION_RECAP_WINDOW_DAYS;
+    expect(resolveWindowDays()).toBe(RECAP_WINDOW_DAYS);
+  });
+
+  it("returns default when env is empty string", () => {
+    process.env.AMICODE_SESSION_RECAP_WINDOW_DAYS = "";
+    expect(resolveWindowDays()).toBe(RECAP_WINDOW_DAYS);
+  });
+
+  it("returns default when env is whitespace", () => {
+    process.env.AMICODE_SESSION_RECAP_WINDOW_DAYS = "   ";
+    expect(resolveWindowDays()).toBe(RECAP_WINDOW_DAYS);
+  });
+
+  it("parses a valid integer", () => {
+    process.env.AMICODE_SESSION_RECAP_WINDOW_DAYS = "14";
+    expect(resolveWindowDays()).toBe(14);
+  });
+
+  it("parses a valid float (fractional days)", () => {
+    process.env.AMICODE_SESSION_RECAP_WINDOW_DAYS = "3.5";
+    expect(resolveWindowDays()).toBe(3.5);
+  });
+
+  it("returns default for zero", () => {
+    process.env.AMICODE_SESSION_RECAP_WINDOW_DAYS = "0";
+    expect(resolveWindowDays()).toBe(RECAP_WINDOW_DAYS);
+  });
+
+  it("returns default for negative values", () => {
+    process.env.AMICODE_SESSION_RECAP_WINDOW_DAYS = "-5";
+    expect(resolveWindowDays()).toBe(RECAP_WINDOW_DAYS);
+  });
+
+  it("returns default for NaN strings", () => {
+    process.env.AMICODE_SESSION_RECAP_WINDOW_DAYS = "abc";
+    expect(resolveWindowDays()).toBe(RECAP_WINDOW_DAYS);
+  });
+
+  it("returns default for Infinity", () => {
+    process.env.AMICODE_SESSION_RECAP_WINDOW_DAYS = "Infinity";
+    expect(resolveWindowDays()).toBe(RECAP_WINDOW_DAYS);
+  });
+});
+
 // ── buildRecentSessionsBlock graceful degradation ────────────────────────────
 
 describe("buildRecentSessionsBlock — graceful degradation under Node (no bun:sqlite)", () => {