diff --git a/crates/executor-core/src/sdk/bridge.rs b/crates/executor-core/src/sdk/bridge.rs
index 3179a7c..bdc4b0d 100644
--- a/crates/executor-core/src/sdk/bridge.rs
+++ b/crates/executor-core/src/sdk/bridge.rs
@@ -43,6 +43,15 @@ where
     })
 }
 
+/// Build a Rhai runtime error from a message. Returns the boxed error
+/// directly because every caller needs a `Box<EvalAltResult>` (Rhai's error
+/// type) — the shared home for the pattern the SDK bridges (secrets, email,
+/// users, …) previously each copied.
+#[allow(clippy::unnecessary_box_returns)]
+pub(crate) fn runtime_err(msg: &str) -> Box<EvalAltResult> {
+    EvalAltResult::ErrorRuntime(msg.into(), rhai::Position::NONE).into()
+}
+
 /// Convert a `serde_json::Value` into a Rhai `Dynamic` suitable for
 /// pushing into a script's scope. Numbers prefer the narrowest type
 /// (`i64` over `f64`); anything that can't round-trip falls back to a
diff --git a/crates/executor-core/src/sdk/email.rs b/crates/executor-core/src/sdk/email.rs
index eabd908..7f89117 100644
--- a/crates/executor-core/src/sdk/email.rs
+++ b/crates/executor-core/src/sdk/email.rs
@@ -26,7 +26,7 @@
 
 use std::sync::Arc;
 
-use super::bridge::block_on;
+use super::bridge::{block_on, runtime_err};
 use picloud_shared::{OutboundEmail, SdkCallCx, Services};
 use rhai::{Array, Engine as RhaiEngine, EvalAltResult, Map, Module};
 
@@ -124,8 +124,3 @@ fn addresses(opts: &Map, key: &str) -> Result<Vec<String>, Box<EvalAltResult>> {
         }
     }
 }
-
-#[allow(clippy::unnecessary_box_returns)]
-fn runtime_err(msg: &str) -> Box<EvalAltResult> {
-    EvalAltResult::ErrorRuntime(msg.into(), rhai::Position::NONE).into()
-}
diff --git a/crates/executor-core/src/sdk/http.rs b/crates/executor-core/src/sdk/http.rs
index 7219dc0..520c5a2 100644
--- a/crates/executor-core/src/sdk/http.rs
+++ b/crates/executor-core/src/sdk/http.rs
@@ -32,11 +32,10 @@
 use std::collections::BTreeMap;
 use std::sync::Arc;
 
-use picloud_shared::{HttpError, HttpRequest, HttpResponse, HttpService, SdkCallCx, Services};
+use picloud_shared::{HttpRequest, HttpResponse, HttpService, SdkCallCx, Services};
 use rhai::{Dynamic, Engine as RhaiEngine, EvalAltResult, Map, Module};
-use tokio::runtime::Handle as TokioHandle;
 
-use super::bridge::{dynamic_to_json, json_to_dynamic};
+use super::bridge::{block_on, dynamic_to_json, json_to_dynamic, runtime_err};
 
 /// Bridge-side defaults (the service clamps server-side too). The
 /// `MAX_*` ceilings stay `i64` because they're compared against the
@@ -280,7 +279,11 @@ fn invoke(
         max_redirects: opts.max_redirects,
         script_id: Some(cx.script_id.to_string()),
     };
-    let resp = block_on(svc, cx, req)?;
+    let resp = {
+        let svc = svc.clone();
+        let cx = cx.clone();
+        block_on("http", async move { svc.request(&cx, req).await })?
+    };
     Ok(response_to_dynamic(&resp))
 }
 
@@ -310,7 +313,11 @@ fn invoke_form(
         max_redirects: opts.max_redirects,
         script_id: Some(cx.script_id.to_string()),
     };
-    let resp = block_on(svc, cx, req)?;
+    let resp = {
+        let svc = svc.clone();
+        let cx = cx.clone();
+        block_on("http", async move { svc.request(&cx, req).await })?
+    };
     Ok(response_to_dynamic(&resp))
 }
 
@@ -356,36 +363,10 @@ fn dyn_to_string(v: &Dynamic) -> String {
     }
 }
 
-// Rhai's native-fn error channel is `Box<EvalAltResult>`, so these
-// helpers return the boxed form the call sites need.
+// A validation error, prefixed like the service's runtime errors (the shared
+// `bridge::block_on("http", …)` prefixes the same way, so messages are uniform).
+// Delegates to `bridge::runtime_err`; the boxed return is Rhai's error channel.
 #[allow(clippy::unnecessary_box_returns)]
 fn err(msg: String) -> Box<EvalAltResult> {
-    EvalAltResult::ErrorRuntime(format!("http: {msg}").into(), rhai::Position::NONE).into()
-}
-
-/// Run the async service call from the synchronous Rhai context. Same
-/// pattern as `kv`/`docs`: the script runs under `spawn_blocking`, so a
-/// runtime handle is reachable and blocking on it is correct.
-fn block_on(
-    svc: &Arc<dyn HttpService>,
-    cx: &Arc<SdkCallCx>,
-    req: HttpRequest,
-) -> Result<HttpResponse, Box<EvalAltResult>> {
-    let handle = TokioHandle::try_current().map_err(|e| -> Box<EvalAltResult> {
-        EvalAltResult::ErrorRuntime(
-            format!("http: no tokio runtime available: {e}").into(),
-            rhai::Position::NONE,
-        )
-        .into()
-    })?;
-    let svc = svc.clone();
-    let cx = cx.clone();
-    handle
-        .block_on(async move { svc.request(&cx, req).await })
-        .map_err(map_http_err)
-}
-
-#[allow(clippy::unnecessary_box_returns)]
-fn map_http_err(e: HttpError) -> Box<EvalAltResult> {
-    EvalAltResult::ErrorRuntime(format!("http: {e}").into(), rhai::Position::NONE).into()
+    runtime_err(&format!("http: {msg}"))
 }
diff --git a/crates/executor-core/src/sdk/secrets.rs b/crates/executor-core/src/sdk/secrets.rs
index 0db54fa..d133150 100644
--- a/crates/executor-core/src/sdk/secrets.rs
+++ b/crates/executor-core/src/sdk/secrets.rs
@@ -21,7 +21,7 @@ use std::sync::Arc;
 use picloud_shared::{SdkCallCx, SecretsListPage, Services};
 use rhai::{Array, Dynamic, Engine as RhaiEngine, EvalAltResult, Map, Module};
 
-use super::bridge::{block_on, dynamic_to_json, json_to_dynamic};
+use super::bridge::{block_on, dynamic_to_json, json_to_dynamic, runtime_err};
 
 pub(super) fn register(engine: &mut RhaiEngine, services: &Services, cx: Arc<SdkCallCx>) {
     let svc = services.secrets.clone();
@@ -124,10 +124,3 @@ fn list_page_to_map(page: SecretsListPage) -> Map {
     );
     m
 }
-
-// Returns the boxed error directly because every caller needs a
-// `Box<EvalAltResult>` (Rhai's error type), matching the other bridges.
-#[allow(clippy::unnecessary_box_returns)]
-fn runtime_err(msg: &str) -> Box<EvalAltResult> {
-    EvalAltResult::ErrorRuntime(msg.into(), rhai::Position::NONE).into()
-}
diff --git a/crates/executor-core/src/sdk/users.rs b/crates/executor-core/src/sdk/users.rs
index a0bdccc..06d6e69 100644
--- a/crates/executor-core/src/sdk/users.rs
+++ b/crates/executor-core/src/sdk/users.rs
@@ -50,7 +50,7 @@
 
 use std::sync::Arc;
 
-use super::bridge::block_on;
+use super::bridge::{block_on, runtime_err};
 use picloud_shared::{
     AppUser, AppUserId, CreateUserInput, EmailTemplateOpts, GeneratedAccept, GeneratedSession,
     InviteOpts, SdkCallCx, Services, UpdateUserInput, UsersListOpts, UsersListPage, UsersService,
@@ -615,8 +615,3 @@ fn optional_string(opts: &Map, key: &str) -> Option<String> {
         Some(d) => Some(d.to_string()),
     }
 }
-
-#[allow(clippy::unnecessary_box_returns)]
-fn runtime_err(msg: &str) -> Box<EvalAltResult> {
-    EvalAltResult::ErrorRuntime(msg.into(), rhai::Position::NONE).into()
-}