diff --git a/backend/tests/sign_s3_objects_authz.rs b/backend/tests/sign_s3_objects_authz.rs
index a2baf9d449..511ef39ab5 100644
--- a/backend/tests/sign_s3_objects_authz.rs
+++ b/backend/tests/sign_s3_objects_authz.rs
@@ -17,7 +17,11 @@
 //! so two test functions sharing the one fixture workspace serve each other's stale — by then
 //! deleted — filesystem root.
 //!
-//! Advanced S3 permissions are an enterprise feature, so this test requires the
+//! A second test pins the `expiry_secs` bounds: the signature's `exp` follows the caller's
+//! request, defaults to 12h, and is clamped to [60s, 7d]. It only mints signatures and never
+//! fetches through the proxy, so it never populates or reads that cache.
+//!
+//! Advanced S3 permissions are an enterprise feature, so these tests require the
 //! `enterprise` + `private` + `parquet` features.
 #![cfg(all(feature = "enterprise", feature = "private", feature = "parquet"))]
 
@@ -175,3 +179,88 @@ async fn test_sign_s3_objects_enforces_read_authz(db: Pool<Postgres>) -> anyhow:
 
     Ok(())
 }
+
+/// `exp` is signed into the HMAC message, so the only way a caller can influence
+/// it is through `expiry_secs` — pin the default and both clamp bounds.
+#[sqlx::test(fixtures("base"))]
+async fn test_sign_s3_objects_expiry_secs(db: Pool<Postgres>) -> anyhow::Result<()> {
+    initialize_tracing().await;
+
+    let server = ApiServer::start(db.clone()).await?;
+    let port = server.addr.port();
+    let base = format!("http://localhost:{port}/api/w/test-workspace");
+
+    let storage_dir = tempfile::tempdir()?;
+    configure_lfs(&db, &storage_dir.path().to_string_lossy()).await?;
+
+    async fn signed_exp(base: &str, body: serde_json::Value) -> anyhow::Result<i64> {
+        let resp = authed(
+            client().post(format!("{base}/apps/sign_s3_objects")),
+            "SECRET_TOKEN",
+        )
+        .json(&body)
+        .send()
+        .await?;
+        let status = resp.status();
+        let signed: serde_json::Value = resp.json().await?;
+        assert!(status.is_success(), "sign must succeed: {status} {signed}");
+        let presigned = signed[0]["presigned"]
+            .as_str()
+            .expect("sign must return a presigned string");
+        let exp = presigned
+            .split('&')
+            .find_map(|kv| kv.strip_prefix("exp="))
+            .expect("presigned string must carry exp");
+        Ok(exp.parse::<i64>()?)
+    }
+
+    let key = json!([{ "s3": "allowed/file.txt" }]);
+    // The handler stamps `now` itself, so assert on a window rather than an exact value.
+    // Keep the window well under the 60s lower bound, or an unclamped 1s would pass.
+    let ttl_around = |exp: i64| exp - chrono::Utc::now().timestamp();
+    let tolerance = 30;
+
+    let default_ttl = ttl_around(signed_exp(&base, json!({ "s3_objects": key.clone() })).await?);
+    assert!(
+        (43200 - tolerance..=43200).contains(&default_ttl),
+        "omitting expiry_secs must keep the 12h default, got {default_ttl}s"
+    );
+
+    let honored = ttl_around(
+        signed_exp(
+            &base,
+            json!({ "s3_objects": key.clone(), "expiry_secs": 300 }),
+        )
+        .await?,
+    );
+    assert!(
+        (300 - tolerance..=300).contains(&honored),
+        "expiry_secs must be honored verbatim inside the bounds, got {honored}s"
+    );
+
+    let clamped_low = ttl_around(
+        signed_exp(
+            &base,
+            json!({ "s3_objects": key.clone(), "expiry_secs": 1 }),
+        )
+        .await?,
+    );
+    assert!(
+        (60 - tolerance..=60).contains(&clamped_low),
+        "expiry_secs below 60s must clamp up to 60s, got {clamped_low}s"
+    );
+
+    let clamped_high = ttl_around(
+        signed_exp(
+            &base,
+            json!({ "s3_objects": key.clone(), "expiry_secs": 99_999_999 }),
+        )
+        .await?,
+    );
+    assert!(
+        (604800 - tolerance..=604800).contains(&clamped_high),
+        "expiry_secs above 7d must clamp down to 7d, got {clamped_high}s"
+    );
+
+    Ok(())
+}
diff --git a/backend/windmill-api/openapi.yaml b/backend/windmill-api/openapi.yaml
index 1fe3423316..d88c633106 100644
--- a/backend/windmill-api/openapi.yaml
+++ b/backend/windmill-api/openapi.yaml
@@ -13468,6 +13468,10 @@ paths:
                   type: array
                   items:
                     $ref: "#/components/schemas/S3Object"
+                expiry_secs:
+                  type: integer
+                  format: int64
+                  description: how long the signature stays valid, in seconds. Defaults to 43200 (12h) and is clamped server-side to [60, 604800] (1 minute to 7 days).
               required:
                 - s3_objects
       responses:
diff --git a/backend/windmill-api/src/apps.rs b/backend/windmill-api/src/apps.rs
index 0e64d1cba2..7bc995844d 100644
--- a/backend/windmill-api/src/apps.rs
+++ b/backend/windmill-api/src/apps.rs
@@ -4112,10 +4112,18 @@ struct S3DeleteTokenClaims {
     pub exp: usize,
 }
 
+#[cfg(feature = "parquet")]
+const SIGN_S3_DEFAULT_EXPIRY_SECS: i64 = 12 * 60 * 60;
+#[cfg(feature = "parquet")]
+const SIGN_S3_MIN_EXPIRY_SECS: i64 = 60;
+#[cfg(feature = "parquet")]
+const SIGN_S3_MAX_EXPIRY_SECS: i64 = 7 * 24 * 60 * 60;
+
 #[cfg(feature = "parquet")]
 #[derive(Deserialize)]
 struct S3TokenRequestBody {
     s3_objects: Vec<S3Object>,
+    expiry_secs: Option<i64>,
 }
 #[cfg(feature = "parquet")]
 async fn sign_s3_objects(
@@ -4126,6 +4134,12 @@ async fn sign_s3_objects(
 ) -> Result<Json<Vec<S3Object>>> {
     let workspace_key = get_workspace_key(&w_id, &db).await?;
 
+    let expiry_secs = body
+        .expiry_secs
+        .unwrap_or(SIGN_S3_DEFAULT_EXPIRY_SECS)
+        .clamp(SIGN_S3_MIN_EXPIRY_SECS, SIGN_S3_MAX_EXPIRY_SECS);
+    let exp = (chrono::Utc::now() + chrono::Duration::seconds(expiry_secs)).timestamp();
+
     let futures = body.s3_objects.into_iter().map(|s3_object| async {
         // The signature this mints is a transferable bearer capability: `validate_s3_signature`
         // only checks the HMAC and expiry, so anyone who obtains the string can read this key.
@@ -4156,7 +4170,6 @@ async fn sign_s3_objects(
         )
         .await?;
 
-        let exp = (chrono::Utc::now() + chrono::Duration::hours(12)).timestamp();
         let message = format!(
             "file_key={}&exp={}{}",
             s3_object.s3.clone(),
diff --git a/cli/src/guidance/skills.gen.ts b/cli/src/guidance/skills.gen.ts
index 0f57c21463..b5cb3417f4 100644
--- a/cli/src/guidance/skills.gen.ts
+++ b/cli/src/guidance/skills.gen.ts
@@ -848,31 +848,35 @@ async deleteS3File(s3object: S3Object, workspace: string | undefined = undefined
 /**
  * Sign S3 objects to be used by anonymous users in public apps
  * @param s3objects s3 objects to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed s3 objects
  */
-async signS3Objects(s3objects: S3Object[]): Promise<S3Object[]>
+async signS3Objects(s3objects: S3Object[], { expirySecs }: { expirySecs?: number } = {}): Promise<S3Object[]>
 
 /**
  * Sign S3 object to be used by anonymous users in public apps
  * @param s3object s3 object to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed s3 object
  */
-async signS3Object(s3object: S3Object): Promise<S3Object>
+async signS3Object(s3object: S3Object, { expirySecs }: { expirySecs?: number } = {}): Promise<S3Object>
 
 /**
  * Generate a presigned public URL for an array of S3 objects.
  * If an S3 object is not signed yet, it will be signed first.
  * @param s3Objects s3 objects to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns list of signed public URLs
  */
-async getPresignedS3PublicUrls(s3Objects: S3Object[], { baseUrl }: { baseUrl?: string } = {}): Promise<string[]>
+async getPresignedS3PublicUrls(s3Objects: S3Object[], { baseUrl, expirySecs }: { baseUrl?: string; expirySecs?: number } = {}): Promise<string[]>
 
 /**
  * Generate a presigned public URL for an S3 object. If the S3 object is not signed yet, it will be signed first.
  * @param s3Object s3 object to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed public URL
  */
-async getPresignedS3PublicUrl(s3Objects: S3Object, { baseUrl }: { baseUrl?: string } = {}): Promise<string>
+async getPresignedS3PublicUrl(s3Objects: S3Object, { baseUrl, expirySecs }: { baseUrl?: string; expirySecs?: number } = {}): Promise<string>
 
 /**
  * Get URLs needed for resuming a flow after this step
@@ -1631,31 +1635,35 @@ async deleteS3File(s3object: S3Object, workspace: string | undefined = undefined
 /**
  * Sign S3 objects to be used by anonymous users in public apps
  * @param s3objects s3 objects to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed s3 objects
  */
-async signS3Objects(s3objects: S3Object[]): Promise<S3Object[]>
+async signS3Objects(s3objects: S3Object[], { expirySecs }: { expirySecs?: number } = {}): Promise<S3Object[]>
 
 /**
  * Sign S3 object to be used by anonymous users in public apps
  * @param s3object s3 object to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed s3 object
  */
-async signS3Object(s3object: S3Object): Promise<S3Object>
+async signS3Object(s3object: S3Object, { expirySecs }: { expirySecs?: number } = {}): Promise<S3Object>
 
 /**
  * Generate a presigned public URL for an array of S3 objects.
  * If an S3 object is not signed yet, it will be signed first.
  * @param s3Objects s3 objects to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns list of signed public URLs
  */
-async getPresignedS3PublicUrls(s3Objects: S3Object[], { baseUrl }: { baseUrl?: string } = {}): Promise<string[]>
+async getPresignedS3PublicUrls(s3Objects: S3Object[], { baseUrl, expirySecs }: { baseUrl?: string; expirySecs?: number } = {}): Promise<string[]>
 
 /**
  * Generate a presigned public URL for an S3 object. If the S3 object is not signed yet, it will be signed first.
  * @param s3Object s3 object to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed public URL
  */
-async getPresignedS3PublicUrl(s3Objects: S3Object, { baseUrl }: { baseUrl?: string } = {}): Promise<string>
+async getPresignedS3PublicUrl(s3Objects: S3Object, { baseUrl, expirySecs }: { baseUrl?: string; expirySecs?: number } = {}): Promise<string>
 
 /**
  * Get URLs needed for resuming a flow after this step
@@ -2508,31 +2516,35 @@ async deleteS3File(s3object: S3Object, workspace: string | undefined = undefined
 /**
  * Sign S3 objects to be used by anonymous users in public apps
  * @param s3objects s3 objects to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed s3 objects
  */
-async signS3Objects(s3objects: S3Object[]): Promise<S3Object[]>
+async signS3Objects(s3objects: S3Object[], { expirySecs }: { expirySecs?: number } = {}): Promise<S3Object[]>
 
 /**
  * Sign S3 object to be used by anonymous users in public apps
  * @param s3object s3 object to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed s3 object
  */
-async signS3Object(s3object: S3Object): Promise<S3Object>
+async signS3Object(s3object: S3Object, { expirySecs }: { expirySecs?: number } = {}): Promise<S3Object>
 
 /**
  * Generate a presigned public URL for an array of S3 objects.
  * If an S3 object is not signed yet, it will be signed first.
  * @param s3Objects s3 objects to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns list of signed public URLs
  */
-async getPresignedS3PublicUrls(s3Objects: S3Object[], { baseUrl }: { baseUrl?: string } = {}): Promise<string[]>
+async getPresignedS3PublicUrls(s3Objects: S3Object[], { baseUrl, expirySecs }: { baseUrl?: string; expirySecs?: number } = {}): Promise<string[]>
 
 /**
  * Generate a presigned public URL for an S3 object. If the S3 object is not signed yet, it will be signed first.
  * @param s3Object s3 object to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed public URL
  */
-async getPresignedS3PublicUrl(s3Objects: S3Object, { baseUrl }: { baseUrl?: string } = {}): Promise<string>
+async getPresignedS3PublicUrl(s3Objects: S3Object, { baseUrl, expirySecs }: { baseUrl?: string; expirySecs?: number } = {}): Promise<string>
 
 /**
  * Get URLs needed for resuming a flow after this step
@@ -4225,19 +4237,23 @@ def delete_s3_object(s3object: S3Object | str, s3_resource_path: str | None = No
 # 
 # Args:
 #     s3_objects: List of S3 objects to sign
+#     expiry_secs: How long the signature stays valid, in seconds
+#         (defaults to 43200 = 12h, clamped to [60, 604800])
 # 
 # Returns:
 #     List of signed S3 objects
-def sign_s3_objects(s3_objects: list[S3Object | str]) -> list[S3Object]
+def sign_s3_objects(s3_objects: list[S3Object | str], expiry_secs: int | None = None) -> list[S3Object]
 
 # Sign a single S3 object for use by anonymous users in public apps.
 # 
 # Args:
 #     s3_object: S3 object to sign
+#     expiry_secs: How long the signature stays valid, in seconds
+#         (defaults to 43200 = 12h, clamped to [60, 604800])
 # 
 # Returns:
 #     Signed S3 object
-def sign_s3_object(s3_object: S3Object | str) -> S3Object
+def sign_s3_object(s3_object: S3Object | str, expiry_secs: int | None = None) -> S3Object
 
 # Generate presigned public URLs for an array of S3 objects.
 # If an S3 object is not signed yet, it will be signed first.
@@ -4245,6 +4261,8 @@ def sign_s3_object(s3_object: S3Object | str) -> S3Object
 # Args:
 #     s3_objects: List of S3 objects to sign
 #     base_url: Optional base URL for the presigned URLs (defaults to WM_BASE_URL)
+#     expiry_secs: How long the signatures stay valid, in seconds
+#         (defaults to 43200 = 12h, clamped to [60, 604800])
 # 
 # Returns:
 #     List of signed public URLs
@@ -4252,7 +4270,7 @@ def sign_s3_object(s3_object: S3Object | str) -> S3Object
 # Example:
 #     >>> s3_objs = [S3Object(s3="/path/to/file1.txt"), S3Object(s3="/path/to/file2.txt")]
 #     >>> urls = client.get_presigned_s3_public_urls(s3_objs)
-def get_presigned_s3_public_urls(s3_objects: list[S3Object | str], base_url: str | None = None) -> list[str]
+def get_presigned_s3_public_urls(s3_objects: list[S3Object | str], base_url: str | None = None, expiry_secs: int | None = None) -> list[str]
 
 # Generate a presigned public URL for an S3 object.
 # If the S3 object is not signed yet, it will be signed first.
@@ -4260,6 +4278,8 @@ def get_presigned_s3_public_urls(s3_objects: list[S3Object | str], base_url: str
 # Args:
 #     s3_object: S3 object to sign
 #     base_url: Optional base URL for the presigned URL (defaults to WM_BASE_URL)
+#     expiry_secs: How long the signature stays valid, in seconds
+#         (defaults to 43200 = 12h, clamped to [60, 604800])
 # 
 # Returns:
 #     Signed public URL
@@ -4267,7 +4287,7 @@ def get_presigned_s3_public_urls(s3_objects: list[S3Object | str], base_url: str
 # Example:
 #     >>> s3_obj = S3Object(s3="/path/to/file.txt")
 #     >>> url = client.get_presigned_s3_public_url(s3_obj)
-def get_presigned_s3_public_url(s3_object: S3Object | str, base_url: str | None = None) -> str
+def get_presigned_s3_public_url(s3_object: S3Object | str, base_url: str | None = None, expiry_secs: int | None = None) -> str
 
 # Get the current user information.
 # 
diff --git a/python-client/wmill/wmill/client.py b/python-client/wmill/wmill/client.py
index 9400dabdc7..3c0ce050fb 100644
--- a/python-client/wmill/wmill/client.py
+++ b/python-client/wmill/wmill/client.py
@@ -31,6 +31,15 @@ logger = logging.getLogger("windmill_client")
 JobStatus = Literal["RUNNING", "WAITING", "COMPLETED"]
 
 
+def _sign_s3_objects_body(s3_objects: list, expiry_secs: int | None) -> dict:
+    # `expiry_secs` is optional but not nullable in the spec, so omit it rather than
+    # sending an explicit null a validating gateway would reject.
+    body: dict = {"s3_objects": s3_objects}
+    if expiry_secs is not None:
+        body["expiry_secs"] = expiry_secs
+    return body
+
+
 class Windmill:
     """Windmill client for interacting with the Windmill API."""
 
@@ -1044,37 +1053,45 @@ class Windmill:
         except Exception as e:
             raise Exception("Could not delete file from S3") from e
 
-    def sign_s3_objects(self, s3_objects: list[S3Object | str]) -> list[S3Object]:
+    def sign_s3_objects(
+        self, s3_objects: list[S3Object | str], expiry_secs: int | None = None
+    ) -> list[S3Object]:
         """Sign S3 objects for use by anonymous users in public apps.
 
         Args:
             s3_objects: List of S3 objects to sign
+            expiry_secs: How long the signature stays valid, in seconds
+                (defaults to 43200 = 12h, clamped to [60, 604800])
 
         Returns:
             List of signed S3 objects
         """
         return self.post(
-            f"/w/{self.workspace}/apps/sign_s3_objects", json={"s3_objects": list(map(parse_s3_object, s3_objects))}
+            f"/w/{self.workspace}/apps/sign_s3_objects",
+            json=_sign_s3_objects_body(list(map(parse_s3_object, s3_objects)), expiry_secs),
         ).json()
 
-    def sign_s3_object(self, s3_object: S3Object | str) -> S3Object:
+    def sign_s3_object(self, s3_object: S3Object | str, expiry_secs: int | None = None) -> S3Object:
         """Sign a single S3 object for use by anonymous users in public apps.
 
         Args:
             s3_object: S3 object to sign
+            expiry_secs: How long the signature stays valid, in seconds
+                (defaults to 43200 = 12h, clamped to [60, 604800])
 
         Returns:
             Signed S3 object
         """
         return self.post(
             f"/w/{self.workspace}/apps/sign_s3_objects",
-            json={"s3_objects": [s3_object]},
+            json=_sign_s3_objects_body([s3_object], expiry_secs),
         ).json()[0]
 
     def get_presigned_s3_public_urls(
         self,
         s3_objects: list[S3Object | str],
         base_url: str | None = None,
+        expiry_secs: int | None = None,
     ) -> list[str]:
         """
         Generate presigned public URLs for an array of S3 objects.
@@ -1083,6 +1100,8 @@ class Windmill:
         Args:
             s3_objects: List of S3 objects to sign
             base_url: Optional base URL for the presigned URLs (defaults to WM_BASE_URL)
+            expiry_secs: How long the signatures stay valid, in seconds
+                (defaults to 43200 = 12h, clamped to [60, 604800])
 
         Returns:
             List of signed public URLs
@@ -1104,7 +1123,7 @@ class Windmill:
 
         if s3_objs_to_sign:
             signed_s3_objs = self.sign_s3_objects(
-                [s3_obj for s3_obj, _ in s3_objs_to_sign]
+                [s3_obj for s3_obj, _ in s3_objs_to_sign], expiry_secs
             )
             for i, (_, original_index) in enumerate(s3_objs_to_sign):
                 s3_objs[original_index] = parse_s3_object(signed_s3_objs[i])
@@ -1123,6 +1142,7 @@ class Windmill:
         self,
         s3_object: S3Object | str,
         base_url: str | None = None,
+        expiry_secs: int | None = None,
     ) -> str:
         """
         Generate a presigned public URL for an S3 object.
@@ -1131,6 +1151,8 @@ class Windmill:
         Args:
             s3_object: S3 object to sign
             base_url: Optional base URL for the presigned URL (defaults to WM_BASE_URL)
+            expiry_secs: How long the signature stays valid, in seconds
+                (defaults to 43200 = 12h, clamped to [60, 604800])
 
         Returns:
             Signed public URL
@@ -1139,7 +1161,7 @@ class Windmill:
             >>> s3_obj = S3Object(s3="/path/to/file.txt")
             >>> url = client.get_presigned_s3_public_url(s3_obj)
         """
-        urls = self.get_presigned_s3_public_urls([s3_object], base_url)
+        urls = self.get_presigned_s3_public_urls([s3_object], base_url, expiry_secs)
         return urls[0]
 
     def _get_public_base_url(self) -> str:
@@ -1814,27 +1836,38 @@ def delete_s3_object(
 
 
 @init_global_client
-def sign_s3_objects(s3_objects: list[S3Object | str]) -> list[S3Object]:
+def sign_s3_objects(s3_objects: list[S3Object | str], expiry_secs: int | None = None) -> list[S3Object]:
     """
     Sign S3 objects to be used by anonymous users in public apps
     Returns a list of signed s3 tokens
+
+    Args:
+        s3_objects: List of S3 objects to sign
+        expiry_secs: How long the signatures stay valid, in seconds
+            (defaults to 43200 = 12h, clamped to [60, 604800])
     """
-    return _client.sign_s3_objects(s3_objects)
+    return _client.sign_s3_objects(s3_objects, expiry_secs)
 
 
 @init_global_client
-def sign_s3_object(s3_object: S3Object| str) -> S3Object:
+def sign_s3_object(s3_object: S3Object| str, expiry_secs: int | None = None) -> S3Object:
     """
     Sign S3 object to be used by anonymous users in public apps
     Returns a signed s3 object
+
+    Args:
+        s3_object: S3 object to sign
+        expiry_secs: How long the signature stays valid, in seconds
+            (defaults to 43200 = 12h, clamped to [60, 604800])
     """
-    return _client.sign_s3_object(s3_object)
+    return _client.sign_s3_object(s3_object, expiry_secs)
 
 
 @init_global_client
 def get_presigned_s3_public_urls(
     s3_objects: list[S3Object | str],
     base_url: str | None = None,
+    expiry_secs: int | None = None,
 ) -> list[str]:
     """
     Generate presigned public URLs for an array of S3 objects.
@@ -1843,6 +1876,8 @@ def get_presigned_s3_public_urls(
     Args:
         s3_objects: List of S3 objects to sign
         base_url: Optional base URL for the presigned URLs (defaults to WM_BASE_URL)
+        expiry_secs: How long the signatures stay valid, in seconds
+            (defaults to 43200 = 12h, clamped to [60, 604800])
 
     Returns:
         List of signed public URLs
@@ -1853,13 +1888,14 @@ def get_presigned_s3_public_urls(
         >>> s3_objs = [S3Object(s3="/path/to/file1.txt"), S3Object(s3="/path/to/file2.txt")]
         >>> urls = wmill.get_presigned_s3_public_urls(s3_objs)
     """
-    return _client.get_presigned_s3_public_urls(s3_objects, base_url)
+    return _client.get_presigned_s3_public_urls(s3_objects, base_url, expiry_secs)
 
 
 @init_global_client
 def get_presigned_s3_public_url(
     s3_object: S3Object | str,
     base_url: str | None = None,
+    expiry_secs: int | None = None,
 ) -> str:
     """
     Generate a presigned public URL for an S3 object.
@@ -1868,6 +1904,8 @@ def get_presigned_s3_public_url(
     Args:
         s3_object: S3 object to sign
         base_url: Optional base URL for the presigned URL (defaults to WM_BASE_URL)
+        expiry_secs: How long the signature stays valid, in seconds
+            (defaults to 43200 = 12h, clamped to [60, 604800])
 
     Returns:
         Signed public URL
@@ -1878,7 +1916,7 @@ def get_presigned_s3_public_url(
         >>> s3_obj = S3Object(s3="/path/to/file.txt")
         >>> url = wmill.get_presigned_s3_public_url(s3_obj)
     """
-    return _client.get_presigned_s3_public_url(s3_object, base_url)
+    return _client.get_presigned_s3_public_url(s3_object, base_url, expiry_secs)
 
 
 @init_global_client
diff --git a/system_prompts/auto-generated/prompts.ts b/system_prompts/auto-generated/prompts.ts
index d6fe7689f9..2c3b585c20 100644
--- a/system_prompts/auto-generated/prompts.ts
+++ b/system_prompts/auto-generated/prompts.ts
@@ -1546,31 +1546,35 @@ async deleteS3File(s3object: S3Object, workspace: string | undefined = undefined
 /**
  * Sign S3 objects to be used by anonymous users in public apps
  * @param s3objects s3 objects to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed s3 objects
  */
-async signS3Objects(s3objects: S3Object[]): Promise<S3Object[]>
+async signS3Objects(s3objects: S3Object[], { expirySecs }: { expirySecs?: number } = {}): Promise<S3Object[]>
 
 /**
  * Sign S3 object to be used by anonymous users in public apps
  * @param s3object s3 object to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed s3 object
  */
-async signS3Object(s3object: S3Object): Promise<S3Object>
+async signS3Object(s3object: S3Object, { expirySecs }: { expirySecs?: number } = {}): Promise<S3Object>
 
 /**
  * Generate a presigned public URL for an array of S3 objects.
  * If an S3 object is not signed yet, it will be signed first.
  * @param s3Objects s3 objects to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns list of signed public URLs
  */
-async getPresignedS3PublicUrls(s3Objects: S3Object[], { baseUrl }: { baseUrl?: string } = {}): Promise<string[]>
+async getPresignedS3PublicUrls(s3Objects: S3Object[], { baseUrl, expirySecs }: { baseUrl?: string; expirySecs?: number } = {}): Promise<string[]>
 
 /**
  * Generate a presigned public URL for an S3 object. If the S3 object is not signed yet, it will be signed first.
  * @param s3Object s3 object to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed public URL
  */
-async getPresignedS3PublicUrl(s3Objects: S3Object, { baseUrl }: { baseUrl?: string } = {}): Promise<string>
+async getPresignedS3PublicUrl(s3Objects: S3Object, { baseUrl, expirySecs }: { baseUrl?: string; expirySecs?: number } = {}): Promise<string>
 
 /**
  * Get URLs needed for resuming a flow after this step
@@ -2169,19 +2173,23 @@ def delete_s3_object(s3object: S3Object | str, s3_resource_path: str | None = No
 # 
 # Args:
 #     s3_objects: List of S3 objects to sign
+#     expiry_secs: How long the signature stays valid, in seconds
+#         (defaults to 43200 = 12h, clamped to [60, 604800])
 # 
 # Returns:
 #     List of signed S3 objects
-def sign_s3_objects(s3_objects: list[S3Object | str]) -> list[S3Object]
+def sign_s3_objects(s3_objects: list[S3Object | str], expiry_secs: int | None = None) -> list[S3Object]
 
 # Sign a single S3 object for use by anonymous users in public apps.
 # 
 # Args:
 #     s3_object: S3 object to sign
+#     expiry_secs: How long the signature stays valid, in seconds
+#         (defaults to 43200 = 12h, clamped to [60, 604800])
 # 
 # Returns:
 #     Signed S3 object
-def sign_s3_object(s3_object: S3Object | str) -> S3Object
+def sign_s3_object(s3_object: S3Object | str, expiry_secs: int | None = None) -> S3Object
 
 # Generate presigned public URLs for an array of S3 objects.
 # If an S3 object is not signed yet, it will be signed first.
@@ -2189,6 +2197,8 @@ def sign_s3_object(s3_object: S3Object | str) -> S3Object
 # Args:
 #     s3_objects: List of S3 objects to sign
 #     base_url: Optional base URL for the presigned URLs (defaults to WM_BASE_URL)
+#     expiry_secs: How long the signatures stay valid, in seconds
+#         (defaults to 43200 = 12h, clamped to [60, 604800])
 # 
 # Returns:
 #     List of signed public URLs
@@ -2196,7 +2206,7 @@ def sign_s3_object(s3_object: S3Object | str) -> S3Object
 # Example:
 #     >>> s3_objs = [S3Object(s3="/path/to/file1.txt"), S3Object(s3="/path/to/file2.txt")]
 #     >>> urls = client.get_presigned_s3_public_urls(s3_objs)
-def get_presigned_s3_public_urls(s3_objects: list[S3Object | str], base_url: str | None = None) -> list[str]
+def get_presigned_s3_public_urls(s3_objects: list[S3Object | str], base_url: str | None = None, expiry_secs: int | None = None) -> list[str]
 
 # Generate a presigned public URL for an S3 object.
 # If the S3 object is not signed yet, it will be signed first.
@@ -2204,6 +2214,8 @@ def get_presigned_s3_public_urls(s3_objects: list[S3Object | str], base_url: str
 # Args:
 #     s3_object: S3 object to sign
 #     base_url: Optional base URL for the presigned URL (defaults to WM_BASE_URL)
+#     expiry_secs: How long the signature stays valid, in seconds
+#         (defaults to 43200 = 12h, clamped to [60, 604800])
 # 
 # Returns:
 #     Signed public URL
@@ -2211,7 +2223,7 @@ def get_presigned_s3_public_urls(s3_objects: list[S3Object | str], base_url: str
 # Example:
 #     >>> s3_obj = S3Object(s3="/path/to/file.txt")
 #     >>> url = client.get_presigned_s3_public_url(s3_obj)
-def get_presigned_s3_public_url(s3_object: S3Object | str, base_url: str | None = None) -> str
+def get_presigned_s3_public_url(s3_object: S3Object | str, base_url: str | None = None, expiry_secs: int | None = None) -> str
 
 # Get the current user information.
 # 
diff --git a/system_prompts/auto-generated/script.md b/system_prompts/auto-generated/script.md
index 9b976e347f..0b67fa0027 100644
--- a/system_prompts/auto-generated/script.md
+++ b/system_prompts/auto-generated/script.md
@@ -1738,31 +1738,35 @@ async deleteS3File(s3object: S3Object, workspace: string | undefined = undefined
 /**
  * Sign S3 objects to be used by anonymous users in public apps
  * @param s3objects s3 objects to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed s3 objects
  */
-async signS3Objects(s3objects: S3Object[]): Promise<S3Object[]>
+async signS3Objects(s3objects: S3Object[], { expirySecs }: { expirySecs?: number } = {}): Promise<S3Object[]>
 
 /**
  * Sign S3 object to be used by anonymous users in public apps
  * @param s3object s3 object to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed s3 object
  */
-async signS3Object(s3object: S3Object): Promise<S3Object>
+async signS3Object(s3object: S3Object, { expirySecs }: { expirySecs?: number } = {}): Promise<S3Object>
 
 /**
  * Generate a presigned public URL for an array of S3 objects.
  * If an S3 object is not signed yet, it will be signed first.
  * @param s3Objects s3 objects to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns list of signed public URLs
  */
-async getPresignedS3PublicUrls(s3Objects: S3Object[], { baseUrl }: { baseUrl?: string } = {}): Promise<string[]>
+async getPresignedS3PublicUrls(s3Objects: S3Object[], { baseUrl, expirySecs }: { baseUrl?: string; expirySecs?: number } = {}): Promise<string[]>
 
 /**
  * Generate a presigned public URL for an S3 object. If the S3 object is not signed yet, it will be signed first.
  * @param s3Object s3 object to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed public URL
  */
-async getPresignedS3PublicUrl(s3Objects: S3Object, { baseUrl }: { baseUrl?: string } = {}): Promise<string>
+async getPresignedS3PublicUrl(s3Objects: S3Object, { baseUrl, expirySecs }: { baseUrl?: string; expirySecs?: number } = {}): Promise<string>
 
 /**
  * Get URLs needed for resuming a flow after this step
@@ -2361,19 +2365,23 @@ def delete_s3_object(s3object: S3Object | str, s3_resource_path: str | None = No
 # 
 # Args:
 #     s3_objects: List of S3 objects to sign
+#     expiry_secs: How long the signature stays valid, in seconds
+#         (defaults to 43200 = 12h, clamped to [60, 604800])
 # 
 # Returns:
 #     List of signed S3 objects
-def sign_s3_objects(s3_objects: list[S3Object | str]) -> list[S3Object]
+def sign_s3_objects(s3_objects: list[S3Object | str], expiry_secs: int | None = None) -> list[S3Object]
 
 # Sign a single S3 object for use by anonymous users in public apps.
 # 
 # Args:
 #     s3_object: S3 object to sign
+#     expiry_secs: How long the signature stays valid, in seconds
+#         (defaults to 43200 = 12h, clamped to [60, 604800])
 # 
 # Returns:
 #     Signed S3 object
-def sign_s3_object(s3_object: S3Object | str) -> S3Object
+def sign_s3_object(s3_object: S3Object | str, expiry_secs: int | None = None) -> S3Object
 
 # Generate presigned public URLs for an array of S3 objects.
 # If an S3 object is not signed yet, it will be signed first.
@@ -2381,6 +2389,8 @@ def sign_s3_object(s3_object: S3Object | str) -> S3Object
 # Args:
 #     s3_objects: List of S3 objects to sign
 #     base_url: Optional base URL for the presigned URLs (defaults to WM_BASE_URL)
+#     expiry_secs: How long the signatures stay valid, in seconds
+#         (defaults to 43200 = 12h, clamped to [60, 604800])
 # 
 # Returns:
 #     List of signed public URLs
@@ -2388,7 +2398,7 @@ def sign_s3_object(s3_object: S3Object | str) -> S3Object
 # Example:
 #     >>> s3_objs = [S3Object(s3="/path/to/file1.txt"), S3Object(s3="/path/to/file2.txt")]
 #     >>> urls = client.get_presigned_s3_public_urls(s3_objs)
-def get_presigned_s3_public_urls(s3_objects: list[S3Object | str], base_url: str | None = None) -> list[str]
+def get_presigned_s3_public_urls(s3_objects: list[S3Object | str], base_url: str | None = None, expiry_secs: int | None = None) -> list[str]
 
 # Generate a presigned public URL for an S3 object.
 # If the S3 object is not signed yet, it will be signed first.
@@ -2396,6 +2406,8 @@ def get_presigned_s3_public_urls(s3_objects: list[S3Object | str], base_url: str
 # Args:
 #     s3_object: S3 object to sign
 #     base_url: Optional base URL for the presigned URL (defaults to WM_BASE_URL)
+#     expiry_secs: How long the signature stays valid, in seconds
+#         (defaults to 43200 = 12h, clamped to [60, 604800])
 # 
 # Returns:
 #     Signed public URL
@@ -2403,7 +2415,7 @@ def get_presigned_s3_public_urls(s3_objects: list[S3Object | str], base_url: str
 # Example:
 #     >>> s3_obj = S3Object(s3="/path/to/file.txt")
 #     >>> url = client.get_presigned_s3_public_url(s3_obj)
-def get_presigned_s3_public_url(s3_object: S3Object | str, base_url: str | None = None) -> str
+def get_presigned_s3_public_url(s3_object: S3Object | str, base_url: str | None = None, expiry_secs: int | None = None) -> str
 
 # Get the current user information.
 # 
diff --git a/system_prompts/auto-generated/sdks/python.md b/system_prompts/auto-generated/sdks/python.md
index 0c5a0f37d7..f30f1a0018 100644
--- a/system_prompts/auto-generated/sdks/python.md
+++ b/system_prompts/auto-generated/sdks/python.md
@@ -313,19 +313,23 @@ def delete_s3_object(s3object: S3Object | str, s3_resource_path: str | None = No
 # 
 # Args:
 #     s3_objects: List of S3 objects to sign
+#     expiry_secs: How long the signature stays valid, in seconds
+#         (defaults to 43200 = 12h, clamped to [60, 604800])
 # 
 # Returns:
 #     List of signed S3 objects
-def sign_s3_objects(s3_objects: list[S3Object | str]) -> list[S3Object]
+def sign_s3_objects(s3_objects: list[S3Object | str], expiry_secs: int | None = None) -> list[S3Object]
 
 # Sign a single S3 object for use by anonymous users in public apps.
 # 
 # Args:
 #     s3_object: S3 object to sign
+#     expiry_secs: How long the signature stays valid, in seconds
+#         (defaults to 43200 = 12h, clamped to [60, 604800])
 # 
 # Returns:
 #     Signed S3 object
-def sign_s3_object(s3_object: S3Object | str) -> S3Object
+def sign_s3_object(s3_object: S3Object | str, expiry_secs: int | None = None) -> S3Object
 
 # Generate presigned public URLs for an array of S3 objects.
 # If an S3 object is not signed yet, it will be signed first.
@@ -333,6 +337,8 @@ def sign_s3_object(s3_object: S3Object | str) -> S3Object
 # Args:
 #     s3_objects: List of S3 objects to sign
 #     base_url: Optional base URL for the presigned URLs (defaults to WM_BASE_URL)
+#     expiry_secs: How long the signatures stay valid, in seconds
+#         (defaults to 43200 = 12h, clamped to [60, 604800])
 # 
 # Returns:
 #     List of signed public URLs
@@ -340,7 +346,7 @@ def sign_s3_object(s3_object: S3Object | str) -> S3Object
 # Example:
 #     >>> s3_objs = [S3Object(s3="/path/to/file1.txt"), S3Object(s3="/path/to/file2.txt")]
 #     >>> urls = client.get_presigned_s3_public_urls(s3_objs)
-def get_presigned_s3_public_urls(s3_objects: list[S3Object | str], base_url: str | None = None) -> list[str]
+def get_presigned_s3_public_urls(s3_objects: list[S3Object | str], base_url: str | None = None, expiry_secs: int | None = None) -> list[str]
 
 # Generate a presigned public URL for an S3 object.
 # If the S3 object is not signed yet, it will be signed first.
@@ -348,6 +354,8 @@ def get_presigned_s3_public_urls(s3_objects: list[S3Object | str], base_url: str
 # Args:
 #     s3_object: S3 object to sign
 #     base_url: Optional base URL for the presigned URL (defaults to WM_BASE_URL)
+#     expiry_secs: How long the signature stays valid, in seconds
+#         (defaults to 43200 = 12h, clamped to [60, 604800])
 # 
 # Returns:
 #     Signed public URL
@@ -355,7 +363,7 @@ def get_presigned_s3_public_urls(s3_objects: list[S3Object | str], base_url: str
 # Example:
 #     >>> s3_obj = S3Object(s3="/path/to/file.txt")
 #     >>> url = client.get_presigned_s3_public_url(s3_obj)
-def get_presigned_s3_public_url(s3_object: S3Object | str, base_url: str | None = None) -> str
+def get_presigned_s3_public_url(s3_object: S3Object | str, base_url: str | None = None, expiry_secs: int | None = None) -> str
 
 # Get the current user information.
 # 
diff --git a/system_prompts/auto-generated/sdks/typescript.md b/system_prompts/auto-generated/sdks/typescript.md
index df0ff4786f..1269a3e497 100644
--- a/system_prompts/auto-generated/sdks/typescript.md
+++ b/system_prompts/auto-generated/sdks/typescript.md
@@ -303,31 +303,35 @@ async deleteS3File(s3object: S3Object, workspace: string | undefined = undefined
 /**
  * Sign S3 objects to be used by anonymous users in public apps
  * @param s3objects s3 objects to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed s3 objects
  */
-async signS3Objects(s3objects: S3Object[]): Promise<S3Object[]>
+async signS3Objects(s3objects: S3Object[], { expirySecs }: { expirySecs?: number } = {}): Promise<S3Object[]>
 
 /**
  * Sign S3 object to be used by anonymous users in public apps
  * @param s3object s3 object to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed s3 object
  */
-async signS3Object(s3object: S3Object): Promise<S3Object>
+async signS3Object(s3object: S3Object, { expirySecs }: { expirySecs?: number } = {}): Promise<S3Object>
 
 /**
  * Generate a presigned public URL for an array of S3 objects.
  * If an S3 object is not signed yet, it will be signed first.
  * @param s3Objects s3 objects to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns list of signed public URLs
  */
-async getPresignedS3PublicUrls(s3Objects: S3Object[], { baseUrl }: { baseUrl?: string } = {}): Promise<string[]>
+async getPresignedS3PublicUrls(s3Objects: S3Object[], { baseUrl, expirySecs }: { baseUrl?: string; expirySecs?: number } = {}): Promise<string[]>
 
 /**
  * Generate a presigned public URL for an S3 object. If the S3 object is not signed yet, it will be signed first.
  * @param s3Object s3 object to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed public URL
  */
-async getPresignedS3PublicUrl(s3Objects: S3Object, { baseUrl }: { baseUrl?: string } = {}): Promise<string>
+async getPresignedS3PublicUrl(s3Objects: S3Object, { baseUrl, expirySecs }: { baseUrl?: string; expirySecs?: number } = {}): Promise<string>
 
 /**
  * Get URLs needed for resuming a flow after this step
diff --git a/system_prompts/auto-generated/skills/write-script-bun/SKILL.md b/system_prompts/auto-generated/skills/write-script-bun/SKILL.md
index 9d19e4bf85..74ef8f1908 100644
--- a/system_prompts/auto-generated/skills/write-script-bun/SKILL.md
+++ b/system_prompts/auto-generated/skills/write-script-bun/SKILL.md
@@ -474,31 +474,35 @@ async deleteS3File(s3object: S3Object, workspace: string | undefined = undefined
 /**
  * Sign S3 objects to be used by anonymous users in public apps
  * @param s3objects s3 objects to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed s3 objects
  */
-async signS3Objects(s3objects: S3Object[]): Promise<S3Object[]>
+async signS3Objects(s3objects: S3Object[], { expirySecs }: { expirySecs?: number } = {}): Promise<S3Object[]>
 
 /**
  * Sign S3 object to be used by anonymous users in public apps
  * @param s3object s3 object to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed s3 object
  */
-async signS3Object(s3object: S3Object): Promise<S3Object>
+async signS3Object(s3object: S3Object, { expirySecs }: { expirySecs?: number } = {}): Promise<S3Object>
 
 /**
  * Generate a presigned public URL for an array of S3 objects.
  * If an S3 object is not signed yet, it will be signed first.
  * @param s3Objects s3 objects to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns list of signed public URLs
  */
-async getPresignedS3PublicUrls(s3Objects: S3Object[], { baseUrl }: { baseUrl?: string } = {}): Promise<string[]>
+async getPresignedS3PublicUrls(s3Objects: S3Object[], { baseUrl, expirySecs }: { baseUrl?: string; expirySecs?: number } = {}): Promise<string[]>
 
 /**
  * Generate a presigned public URL for an S3 object. If the S3 object is not signed yet, it will be signed first.
  * @param s3Object s3 object to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed public URL
  */
-async getPresignedS3PublicUrl(s3Objects: S3Object, { baseUrl }: { baseUrl?: string } = {}): Promise<string>
+async getPresignedS3PublicUrl(s3Objects: S3Object, { baseUrl, expirySecs }: { baseUrl?: string; expirySecs?: number } = {}): Promise<string>
 
 /**
  * Get URLs needed for resuming a flow after this step
diff --git a/system_prompts/auto-generated/skills/write-script-bunnative/SKILL.md b/system_prompts/auto-generated/skills/write-script-bunnative/SKILL.md
index 5803909032..0c7b6aecde 100644
--- a/system_prompts/auto-generated/skills/write-script-bunnative/SKILL.md
+++ b/system_prompts/auto-generated/skills/write-script-bunnative/SKILL.md
@@ -474,31 +474,35 @@ async deleteS3File(s3object: S3Object, workspace: string | undefined = undefined
 /**
  * Sign S3 objects to be used by anonymous users in public apps
  * @param s3objects s3 objects to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed s3 objects
  */
-async signS3Objects(s3objects: S3Object[]): Promise<S3Object[]>
+async signS3Objects(s3objects: S3Object[], { expirySecs }: { expirySecs?: number } = {}): Promise<S3Object[]>
 
 /**
  * Sign S3 object to be used by anonymous users in public apps
  * @param s3object s3 object to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed s3 object
  */
-async signS3Object(s3object: S3Object): Promise<S3Object>
+async signS3Object(s3object: S3Object, { expirySecs }: { expirySecs?: number } = {}): Promise<S3Object>
 
 /**
  * Generate a presigned public URL for an array of S3 objects.
  * If an S3 object is not signed yet, it will be signed first.
  * @param s3Objects s3 objects to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns list of signed public URLs
  */
-async getPresignedS3PublicUrls(s3Objects: S3Object[], { baseUrl }: { baseUrl?: string } = {}): Promise<string[]>
+async getPresignedS3PublicUrls(s3Objects: S3Object[], { baseUrl, expirySecs }: { baseUrl?: string; expirySecs?: number } = {}): Promise<string[]>
 
 /**
  * Generate a presigned public URL for an S3 object. If the S3 object is not signed yet, it will be signed first.
  * @param s3Object s3 object to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed public URL
  */
-async getPresignedS3PublicUrl(s3Objects: S3Object, { baseUrl }: { baseUrl?: string } = {}): Promise<string>
+async getPresignedS3PublicUrl(s3Objects: S3Object, { baseUrl, expirySecs }: { baseUrl?: string; expirySecs?: number } = {}): Promise<string>
 
 /**
  * Get URLs needed for resuming a flow after this step
diff --git a/system_prompts/auto-generated/skills/write-script-deno/SKILL.md b/system_prompts/auto-generated/skills/write-script-deno/SKILL.md
index 32691fdba8..930f078a58 100644
--- a/system_prompts/auto-generated/skills/write-script-deno/SKILL.md
+++ b/system_prompts/auto-generated/skills/write-script-deno/SKILL.md
@@ -476,31 +476,35 @@ async deleteS3File(s3object: S3Object, workspace: string | undefined = undefined
 /**
  * Sign S3 objects to be used by anonymous users in public apps
  * @param s3objects s3 objects to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed s3 objects
  */
-async signS3Objects(s3objects: S3Object[]): Promise<S3Object[]>
+async signS3Objects(s3objects: S3Object[], { expirySecs }: { expirySecs?: number } = {}): Promise<S3Object[]>
 
 /**
  * Sign S3 object to be used by anonymous users in public apps
  * @param s3object s3 object to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed s3 object
  */
-async signS3Object(s3object: S3Object): Promise<S3Object>
+async signS3Object(s3object: S3Object, { expirySecs }: { expirySecs?: number } = {}): Promise<S3Object>
 
 /**
  * Generate a presigned public URL for an array of S3 objects.
  * If an S3 object is not signed yet, it will be signed first.
  * @param s3Objects s3 objects to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns list of signed public URLs
  */
-async getPresignedS3PublicUrls(s3Objects: S3Object[], { baseUrl }: { baseUrl?: string } = {}): Promise<string[]>
+async getPresignedS3PublicUrls(s3Objects: S3Object[], { baseUrl, expirySecs }: { baseUrl?: string; expirySecs?: number } = {}): Promise<string[]>
 
 /**
  * Generate a presigned public URL for an S3 object. If the S3 object is not signed yet, it will be signed first.
  * @param s3Object s3 object to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed public URL
  */
-async getPresignedS3PublicUrl(s3Objects: S3Object, { baseUrl }: { baseUrl?: string } = {}): Promise<string>
+async getPresignedS3PublicUrl(s3Objects: S3Object, { baseUrl, expirySecs }: { baseUrl?: string; expirySecs?: number } = {}): Promise<string>
 
 /**
  * Get URLs needed for resuming a flow after this step
diff --git a/system_prompts/auto-generated/skills/write-script-python3/SKILL.md b/system_prompts/auto-generated/skills/write-script-python3/SKILL.md
index afa5eda299..274ffb343e 100644
--- a/system_prompts/auto-generated/skills/write-script-python3/SKILL.md
+++ b/system_prompts/auto-generated/skills/write-script-python3/SKILL.md
@@ -498,19 +498,23 @@ def delete_s3_object(s3object: S3Object | str, s3_resource_path: str | None = No
 # 
 # Args:
 #     s3_objects: List of S3 objects to sign
+#     expiry_secs: How long the signature stays valid, in seconds
+#         (defaults to 43200 = 12h, clamped to [60, 604800])
 # 
 # Returns:
 #     List of signed S3 objects
-def sign_s3_objects(s3_objects: list[S3Object | str]) -> list[S3Object]
+def sign_s3_objects(s3_objects: list[S3Object | str], expiry_secs: int | None = None) -> list[S3Object]
 
 # Sign a single S3 object for use by anonymous users in public apps.
 # 
 # Args:
 #     s3_object: S3 object to sign
+#     expiry_secs: How long the signature stays valid, in seconds
+#         (defaults to 43200 = 12h, clamped to [60, 604800])
 # 
 # Returns:
 #     Signed S3 object
-def sign_s3_object(s3_object: S3Object | str) -> S3Object
+def sign_s3_object(s3_object: S3Object | str, expiry_secs: int | None = None) -> S3Object
 
 # Generate presigned public URLs for an array of S3 objects.
 # If an S3 object is not signed yet, it will be signed first.
@@ -518,6 +522,8 @@ def sign_s3_object(s3_object: S3Object | str) -> S3Object
 # Args:
 #     s3_objects: List of S3 objects to sign
 #     base_url: Optional base URL for the presigned URLs (defaults to WM_BASE_URL)
+#     expiry_secs: How long the signatures stay valid, in seconds
+#         (defaults to 43200 = 12h, clamped to [60, 604800])
 # 
 # Returns:
 #     List of signed public URLs
@@ -525,7 +531,7 @@ def sign_s3_object(s3_object: S3Object | str) -> S3Object
 # Example:
 #     >>> s3_objs = [S3Object(s3="/path/to/file1.txt"), S3Object(s3="/path/to/file2.txt")]
 #     >>> urls = client.get_presigned_s3_public_urls(s3_objs)
-def get_presigned_s3_public_urls(s3_objects: list[S3Object | str], base_url: str | None = None) -> list[str]
+def get_presigned_s3_public_urls(s3_objects: list[S3Object | str], base_url: str | None = None, expiry_secs: int | None = None) -> list[str]
 
 # Generate a presigned public URL for an S3 object.
 # If the S3 object is not signed yet, it will be signed first.
@@ -533,6 +539,8 @@ def get_presigned_s3_public_urls(s3_objects: list[S3Object | str], base_url: str
 # Args:
 #     s3_object: S3 object to sign
 #     base_url: Optional base URL for the presigned URL (defaults to WM_BASE_URL)
+#     expiry_secs: How long the signature stays valid, in seconds
+#         (defaults to 43200 = 12h, clamped to [60, 604800])
 # 
 # Returns:
 #     Signed public URL
@@ -540,7 +548,7 @@ def get_presigned_s3_public_urls(s3_objects: list[S3Object | str], base_url: str
 # Example:
 #     >>> s3_obj = S3Object(s3="/path/to/file.txt")
 #     >>> url = client.get_presigned_s3_public_url(s3_obj)
-def get_presigned_s3_public_url(s3_object: S3Object | str, base_url: str | None = None) -> str
+def get_presigned_s3_public_url(s3_object: S3Object | str, base_url: str | None = None, expiry_secs: int | None = None) -> str
 
 # Get the current user information.
 # 
diff --git a/typescript-client/client.d.ts b/typescript-client/client.d.ts
index 1fa1ed1ca6..1e4448300e 100644
--- a/typescript-client/client.d.ts
+++ b/typescript-client/client.d.ts
@@ -200,37 +200,45 @@ export declare function writeS3File(
 /**
  * Sign S3 objects to be used by anonymous users in public apps
  * @param s3objects s3 objects to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed s3 objects
  */
 export declare function signS3Objects(
-  s3objects: S3Object[]
+  s3objects: S3Object[],
+  { expirySecs }?: { expirySecs?: number }
 ): Promise<S3Object[]>;
 /**
  * Sign S3 object to be used by anonymous users in public apps
  * @param s3object s3 object to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed s3 object
  */
-export declare function signS3Object(s3object: S3Object): Promise<S3Object>;
+export declare function signS3Object(
+  s3object: S3Object,
+  { expirySecs }?: { expirySecs?: number }
+): Promise<S3Object>;
 
 /**
  * Generate a presigned public URL for an array of S3 objects.
  * If an S3 object is not signed yet, it will be signed first.
  * @param s3Objects s3 objects to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns list of signed public URLs
  */
 export declare function getPresignedS3PublicUrls(
   s3Objects: S3Object[],
-  { baseUrl }: { baseUrl?: string }
+  { baseUrl, expirySecs }: { baseUrl?: string; expirySecs?: number }
 ): Promise<string[]>;
 
 /**
  * Generate a presigned public URL for an S3 object. If the S3 object is not signed yet, it will be signed first.
  * @param s3Object s3 object to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed public URL
  */
 export declare function getPresignedS3PublicUrl(
   s3Objects: S3Object,
-  { baseUrl }: { baseUrl?: string }
+  { baseUrl, expirySecs }: { baseUrl?: string; expirySecs?: number }
 ): Promise<string>;
 
 /**
diff --git a/typescript-client/client.ts b/typescript-client/client.ts
index f7be5e5a6d..105641eee4 100644
--- a/typescript-client/client.ts
+++ b/typescript-client/client.ts
@@ -1057,15 +1057,18 @@ export async function deleteS3File(
 /**
  * Sign S3 objects to be used by anonymous users in public apps
  * @param s3objects s3 objects to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed s3 objects
  */
 export async function signS3Objects(
-  s3objects: S3Object[]
+  s3objects: S3Object[],
+  { expirySecs }: { expirySecs?: number } = {}
 ): Promise<S3Object[]> {
   const signedKeys = await AppService.signS3Objects({
     workspace: getWorkspace(),
     requestBody: {
       s3_objects: s3objects.map(parseS3Object),
+      expiry_secs: expirySecs,
     },
   });
   return signedKeys;
@@ -1073,10 +1076,14 @@ export async function signS3Objects(
 /**
  * Sign S3 object to be used by anonymous users in public apps
  * @param s3object s3 object to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed s3 object
  */
-export async function signS3Object(s3object: S3Object): Promise<S3Object> {
-  const [signedObject] = await signS3Objects([s3object]);
+export async function signS3Object(
+  s3object: S3Object,
+  { expirySecs }: { expirySecs?: number } = {}
+): Promise<S3Object> {
+  const [signedObject] = await signS3Objects([s3object], { expirySecs });
   return signedObject;
 }
 
@@ -1084,11 +1091,12 @@ export async function signS3Object(s3object: S3Object): Promise<S3Object> {
  * Generate a presigned public URL for an array of S3 objects.
  * If an S3 object is not signed yet, it will be signed first.
  * @param s3Objects s3 objects to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns list of signed public URLs
  */
 export async function getPresignedS3PublicUrls(
   s3Objects: S3Object[],
-  { baseUrl }: { baseUrl?: string } = {}
+  { baseUrl, expirySecs }: { baseUrl?: string; expirySecs?: number } = {}
 ): Promise<string[]> {
   baseUrl ??= getPublicBaseUrl();
 
@@ -1100,7 +1108,8 @@ export async function getPresignedS3PublicUrls(
     .filter(([s3Obj, _]) => s3Obj.presigned === undefined);
   if (s3ObjsToSign.length > 0) {
     const signedS3Objs = await signS3Objects(
-      s3ObjsToSign.map(([s3Obj, _]) => s3Obj)
+      s3ObjsToSign.map(([s3Obj, _]) => s3Obj),
+      { expirySecs }
     );
     for (let i = 0; i < s3ObjsToSign.length; i++) {
       const [_, originalIndex] = s3ObjsToSign[i];
@@ -1120,13 +1129,17 @@ export async function getPresignedS3PublicUrls(
 /**
  * Generate a presigned public URL for an S3 object. If the S3 object is not signed yet, it will be signed first.
  * @param s3Object s3 object to sign
+ * @param expirySecs how long the signature stays valid, in seconds (default 43200 = 12h, clamped to [60, 604800])
  * @returns signed public URL
  */
 export async function getPresignedS3PublicUrl(
   s3Objects: S3Object,
-  { baseUrl }: { baseUrl?: string } = {}
+  { baseUrl, expirySecs }: { baseUrl?: string; expirySecs?: number } = {}
 ): Promise<string> {
-  const [s3Object] = await getPresignedS3PublicUrls([s3Objects], { baseUrl });
+  const [s3Object] = await getPresignedS3PublicUrls([s3Objects], {
+    baseUrl,
+    expirySecs,
+  });
   return s3Object;
 }