diff --git a/cli/src/guidance/skills.ts b/cli/src/guidance/skills.ts
index 6298c39dfb..1f75778bb4 100644
--- a/cli/src/guidance/skills.ts
+++ b/cli/src/guidance/skills.ts
@@ -262,6 +262,8 @@ const result: S3Object = await wmill.writeS3File(
 
 Import: import * as wmill from 'windmill-client'
 
+workerHasInternalServer(): boolean
+
 /**
  * Initialize the Windmill client with authentication token and base URL
  * @param token - Authentication token (defaults to WM_TOKEN env variable)
@@ -925,6 +927,8 @@ const result: S3Object = await wmill.writeS3File(
 
 Import: import * as wmill from 'windmill-client'
 
+workerHasInternalServer(): boolean
+
 /**
  * Initialize the Windmill client with authentication token and base URL
  * @param token - Authentication token (defaults to WM_TOKEN env variable)
@@ -1651,6 +1655,8 @@ const result: S3Object = await wmill.writeS3File(
 
 Import: import * as wmill from 'windmill-client'
 
+workerHasInternalServer(): boolean
+
 /**
  * Initialize the Windmill client with authentication token and base URL
  * @param token - Authentication token (defaults to WM_TOKEN env variable)
@@ -2591,6 +2597,8 @@ export async function preprocessor(event: Event) {
 
 Import: import * as wmill from 'windmill-client'
 
+workerHasInternalServer(): boolean
+
 /**
  * Initialize the Windmill client with authentication token and base URL
  * @param token - Authentication token (defaults to WM_TOKEN env variable)
@@ -3433,6 +3441,8 @@ result: S3Object = wmill.write_s3_file(
 
 Import: import wmill
 
+def worker_has_internal_server() -> bool
+
 def get_mocked_api() -> Optional[dict]
 
 # Get the HTTP client instance.
@@ -3497,7 +3507,10 @@ def run_script_by_path(path: str, args: dict = None, timeout: dt.timedelta | int
 # Run script by hash synchronously and return its result.
 def run_script_by_hash(hash_: str, args: dict = None, timeout: dt.timedelta | int | float | None = None, verbose: bool = False, cleanup: bool = True, assert_result_is_not_none: bool = False) -> Any
 
-# Run a script on the current worker without creating a job
+# Run a script on the current worker without creating a job.
+# 
+# On agent workers (no internal server), falls back to running a normal
+# preview job and waiting for the result.
 def run_inline_script_preview(content: str, language: str, args: dict = None) -> Any
 
 # Wait for a job to complete and return its result.
diff --git a/python-client/wmill/wmill/client.py b/python-client/wmill/wmill/client.py
index be8d9b1150..d70372f626 100644
--- a/python-client/wmill/wmill/client.py
+++ b/python-client/wmill/wmill/client.py
@@ -66,6 +66,11 @@ class Windmill:
             f"workspace required as an argument or as WM_WORKSPACE environment variable"
         )
 
+    def worker_has_internal_server(self) -> bool:
+        return bool(
+            re.match(r"^https?://(localhost|127\.0\.0\.1)(:|/|$)", self.base_url or "")
+        )
+
     def get_mocked_api(self) -> Optional[dict]:
         mocked_path = os.environ.get("WM_MOCKED_API_FILE")
         if not mocked_path:
@@ -326,8 +331,15 @@ class Windmill:
         language: str,
         args: dict = None,
     ) -> Any:
-        """Run a script on the current worker without creating a job"""
-        endpoint = f"/w/{self.workspace}/jobs/run_inline/preview"
+        """Run a script on the current worker without creating a job.
+
+        On agent workers (no internal server), falls back to running a normal
+        preview job and waiting for the result.
+        """
+        if self.worker_has_internal_server():
+            endpoint = f"/w/{self.workspace}/jobs/run_inline/preview"
+        else:
+            endpoint = f"/w/{self.workspace}/jobs/run_wait_result/preview"
         body = {
             "content": content,
             "language": language,
diff --git a/system_prompts/auto-generated/prompts.ts b/system_prompts/auto-generated/prompts.ts
index d5d4f752ad..bdfda1c7aa 100644
--- a/system_prompts/auto-generated/prompts.ts
+++ b/system_prompts/auto-generated/prompts.ts
@@ -153,6 +153,8 @@ export const SDK_TYPESCRIPT = `# TypeScript SDK (windmill-client)
 
 Import: import * as wmill from 'windmill-client'
 
+workerHasInternalServer(): boolean
+
 /**
  * Initialize the Windmill client with authentication token and base URL
  * @param token - Authentication token (defaults to WM_TOKEN env variable)
@@ -690,6 +692,8 @@ export const SDK_PYTHON = `# Python SDK (wmill)
 
 Import: import wmill
 
+def worker_has_internal_server() -> bool
+
 def get_mocked_api() -> Optional[dict]
 
 # Get the HTTP client instance.
@@ -754,7 +758,10 @@ def run_script_by_path(path: str, args: dict = None, timeout: dt.timedelta | int
 # Run script by hash synchronously and return its result.
 def run_script_by_hash(hash_: str, args: dict = None, timeout: dt.timedelta | int | float | None = None, verbose: bool = False, cleanup: bool = True, assert_result_is_not_none: bool = False) -> Any
 
-# Run a script on the current worker without creating a job
+# Run a script on the current worker without creating a job.
+# 
+# On agent workers (no internal server), falls back to running a normal
+# preview job and waiting for the result.
 def run_inline_script_preview(content: str, language: str, args: dict = None) -> Any
 
 # Wait for a job to complete and return its result.
diff --git a/system_prompts/auto-generated/script.md b/system_prompts/auto-generated/script.md
index bd9eaf1764..463cd7965b 100644
--- a/system_prompts/auto-generated/script.md
+++ b/system_prompts/auto-generated/script.md
@@ -1213,6 +1213,8 @@ SELECT * FROM users WHERE name = ? AND age > ?;
 
 Import: import * as wmill from 'windmill-client'
 
+workerHasInternalServer(): boolean
+
 /**
  * Initialize the Windmill client with authentication token and base URL
  * @param token - Authentication token (defaults to WM_TOKEN env variable)
@@ -1750,6 +1752,8 @@ ducklake(name: string = "main"): SqlTemplateFunction
 
 Import: import wmill
 
+def worker_has_internal_server() -> bool
+
 def get_mocked_api() -> Optional[dict]
 
 # Get the HTTP client instance.
@@ -1814,7 +1818,10 @@ def run_script_by_path(path: str, args: dict = None, timeout: dt.timedelta | int
 # Run script by hash synchronously and return its result.
 def run_script_by_hash(hash_: str, args: dict = None, timeout: dt.timedelta | int | float | None = None, verbose: bool = False, cleanup: bool = True, assert_result_is_not_none: bool = False) -> Any
 
-# Run a script on the current worker without creating a job
+# Run a script on the current worker without creating a job.
+# 
+# On agent workers (no internal server), falls back to running a normal
+# preview job and waiting for the result.
 def run_inline_script_preview(content: str, language: str, args: dict = None) -> Any
 
 # Wait for a job to complete and return its result.
diff --git a/system_prompts/auto-generated/sdks/python.md b/system_prompts/auto-generated/sdks/python.md
index 241d438f58..e0b1bd3dfd 100644
--- a/system_prompts/auto-generated/sdks/python.md
+++ b/system_prompts/auto-generated/sdks/python.md
@@ -2,6 +2,8 @@
 
 Import: import wmill
 
+def worker_has_internal_server() -> bool
+
 def get_mocked_api() -> Optional[dict]
 
 # Get the HTTP client instance.
@@ -66,7 +68,10 @@ def run_script_by_path(path: str, args: dict = None, timeout: dt.timedelta | int
 # Run script by hash synchronously and return its result.
 def run_script_by_hash(hash_: str, args: dict = None, timeout: dt.timedelta | int | float | None = None, verbose: bool = False, cleanup: bool = True, assert_result_is_not_none: bool = False) -> Any
 
-# Run a script on the current worker without creating a job
+# Run a script on the current worker without creating a job.
+# 
+# On agent workers (no internal server), falls back to running a normal
+# preview job and waiting for the result.
 def run_inline_script_preview(content: str, language: str, args: dict = None) -> Any
 
 # Wait for a job to complete and return its result.
diff --git a/system_prompts/auto-generated/sdks/typescript.md b/system_prompts/auto-generated/sdks/typescript.md
index 8d96473313..42c8a8e0ba 100644
--- a/system_prompts/auto-generated/sdks/typescript.md
+++ b/system_prompts/auto-generated/sdks/typescript.md
@@ -2,6 +2,8 @@
 
 Import: import * as wmill from 'windmill-client'
 
+workerHasInternalServer(): boolean
+
 /**
  * Initialize the Windmill client with authentication token and base URL
  * @param token - Authentication token (defaults to WM_TOKEN env variable)
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 dd54dbfcd1..0e802b6fba 100644
--- a/system_prompts/auto-generated/skills/write-script-bun/SKILL.md
+++ b/system_prompts/auto-generated/skills/write-script-bun/SKILL.md
@@ -131,6 +131,8 @@ const result: S3Object = await wmill.writeS3File(
 
 Import: import * as wmill from 'windmill-client'
 
+workerHasInternalServer(): boolean
+
 /**
  * Initialize the Windmill client with authentication token and base URL
  * @param token - Authentication token (defaults to WM_TOKEN env variable)
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 8db8b807c2..3e411d4d81 100644
--- a/system_prompts/auto-generated/skills/write-script-bunnative/SKILL.md
+++ b/system_prompts/auto-generated/skills/write-script-bunnative/SKILL.md
@@ -129,6 +129,8 @@ const result: S3Object = await wmill.writeS3File(
 
 Import: import * as wmill from 'windmill-client'
 
+workerHasInternalServer(): boolean
+
 /**
  * Initialize the Windmill client with authentication token and base URL
  * @param token - Authentication token (defaults to WM_TOKEN env variable)
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 89e4f67c50..a250d5d60a 100644
--- a/system_prompts/auto-generated/skills/write-script-deno/SKILL.md
+++ b/system_prompts/auto-generated/skills/write-script-deno/SKILL.md
@@ -135,6 +135,8 @@ const result: S3Object = await wmill.writeS3File(
 
 Import: import * as wmill from 'windmill-client'
 
+workerHasInternalServer(): boolean
+
 /**
  * Initialize the Windmill client with authentication token and base URL
  * @param token - Authentication token (defaults to WM_TOKEN env variable)
diff --git a/system_prompts/auto-generated/skills/write-script-nativets/SKILL.md b/system_prompts/auto-generated/skills/write-script-nativets/SKILL.md
index a2df7c864e..df981a2f90 100644
--- a/system_prompts/auto-generated/skills/write-script-nativets/SKILL.md
+++ b/system_prompts/auto-generated/skills/write-script-nativets/SKILL.md
@@ -96,6 +96,8 @@ export async function preprocessor(event: Event) {
 
 Import: import * as wmill from 'windmill-client'
 
+workerHasInternalServer(): boolean
+
 /**
  * Initialize the Windmill client with authentication token and base URL
  * @param token - Authentication token (defaults to WM_TOKEN env variable)
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 06000d0a07..04c87ca9eb 100644
--- a/system_prompts/auto-generated/skills/write-script-python3/SKILL.md
+++ b/system_prompts/auto-generated/skills/write-script-python3/SKILL.md
@@ -137,6 +137,8 @@ result: S3Object = wmill.write_s3_file(
 
 Import: import wmill
 
+def worker_has_internal_server() -> bool
+
 def get_mocked_api() -> Optional[dict]
 
 # Get the HTTP client instance.
@@ -201,7 +203,10 @@ def run_script_by_path(path: str, args: dict = None, timeout: dt.timedelta | int
 # Run script by hash synchronously and return its result.
 def run_script_by_hash(hash_: str, args: dict = None, timeout: dt.timedelta | int | float | None = None, verbose: bool = False, cleanup: bool = True, assert_result_is_not_none: bool = False) -> Any
 
-# Run a script on the current worker without creating a job
+# Run a script on the current worker without creating a job.
+# 
+# On agent workers (no internal server), falls back to running a normal
+# preview job and waiting for the result.
 def run_inline_script_preview(content: str, language: str, args: dict = None) -> Any
 
 # Wait for a job to complete and return its result.
diff --git a/typescript-client/client.ts b/typescript-client/client.ts
index 1aded4a720..41b66e6d96 100644
--- a/typescript-client/client.ts
+++ b/typescript-client/client.ts
@@ -43,6 +43,10 @@ export const SHARED_FOLDER = "/shared";
 
 let mockedApi: MockedApi | undefined = undefined;
 
+export function workerHasInternalServer(): boolean {
+  return /^https?:\/\/(localhost|127\.0\.0\.1)(:|\/|$)/.test(OpenAPI.BASE ?? "");
+}
+
 /**
  * Initialize the Windmill client with authentication token and base URL
  * @param token - Authentication token (defaults to WM_TOKEN env variable)
diff --git a/typescript-client/sqlUtils.ts b/typescript-client/sqlUtils.ts
index eef46c50bc..26af4aff92 100644
--- a/typescript-client/sqlUtils.ts
+++ b/typescript-client/sqlUtils.ts
@@ -1,4 +1,4 @@
-import { getWorkspace } from "./client";
+import { getWorkspace, workerHasInternalServer } from "./client";
 import { JobService } from "./services.gen";
 
 type ResultCollection =
@@ -223,10 +223,18 @@ function buildSqlTemplateFunction(provider: SqlProvider): SqlTemplateFunction {
       if (resultCollection)
         content = `-- result_collection=${resultCollection}\n${content}`;
       try {
-        let result = await JobService.runScriptPreviewInline({
-          workspace: getWorkspace(),
-          requestBody: { args, content, language: provider.language },
-        });
+        let result;
+        if (workerHasInternalServer()) {
+          result = await JobService.runScriptPreviewInline({
+            workspace: getWorkspace(),
+            requestBody: { args, content, language: provider.language },
+          });
+        } else {
+          result = await JobService.runScriptPreviewAndWaitResult({
+            workspace: getWorkspace(),
+            requestBody: { args, content, language: provider.language },
+          });
+        }
         return result as SqlResult<any, ResultCollectionT>;
       } catch (e: any) {
         let err = e;