diff --git a/examples/rfsclient/README.md b/examples/rfsclient/README.md
index 6c78270..c71936e 100644
--- a/examples/rfsclient/README.md
+++ b/examples/rfsclient/README.md
@@ -2,34 +2,30 @@
 
 This folder contains Rhai examples that use the SAL RFS client wrappers registered by `sal::rhai::register(&mut engine)` and executed by the `herodo` binary.
 
-## Prerequisites
-
-- Build with the client feature enabled (any of these):
-  - `--features rfsclient`
-  - `--features clients`
-  - `--features all`
-- Environment variables:
-  - `RFS_BASE_URL` (e.g., `https://rfs.example.com`)
-  - `RFS_USER` and `RFS_PASS`
-
 ## Quick start
 
-Run the auth + upload + download example:
+Run the auth + upload + download example (uses hardcoded credentials and `/etc/hosts` as input):
 
 ```bash
-RFS_BASE_URL=https://rfs.example.com \
-RFS_USER=your_user \
-RFS_PASS=your_pass \
-cargo run -p herodo --features clients -- examples/rfsclient/auth_and_upload.rhai
+cargo run -p herodo -- examples/rfsclient/auth_and_upload.rhai
 ```
 
+By default, the script:
+
+- Uses base URL `http://127.0.0.1:8080`
+- Uses credentials `user` / `password`
+- Uploads the file `/etc/hosts`
+- Downloads to `/tmp/rfs_example_out.txt`
+
+To customize, edit `examples/rfsclient/auth_and_upload.rhai` near the top and change `BASE_URL`, `USER`, `PASS`, and file paths.
+
 ## What the example does
 
 - Creates the RFS client: `rfs_create_client(BASE_URL, USER, PASS, TIMEOUT)`
 - Health check: `rfs_health_check()`
 - Authenticates: `rfs_authenticate()`
-- Uploads a file: `rfs_upload_file(local_path)` -> file hash
-- Downloads it back: `rfs_download_file(file_id_or_hash, dest_path)`
+- Uploads a file: `rfs_upload_file(local_path, chunk_size, verify)` → returns file hash
+- Downloads it back: `rfs_download_file(file_id_or_hash, dest_path, verify)` → returns unit (throws on error)
 
 See `examples/rfsclient/auth_and_upload.rhai` for details.
 
@@ -39,9 +35,9 @@ If you want to use the Rust API (without Rhai), depend on `sal-rfs-client` and s
 
 - `packages/clients/rfsclient/src/client.rs` (`RfsClient`)
 - `packages/clients/rfsclient/src/types.rs` (config and option types)
+- `packages/clients/rfsclient/examples/` (example usage)
 
 ## Troubleshooting
 
-- Missing functions in Rhai: ensure features include `rfsclient` (or `clients`/`all`).
-- Auth failures: verify `RFS_USER`/`RFS_PASS` and that the server requires/authenticates credentials.
-- Connection errors: verify `RFS_BASE_URL` is reachable from your machine.
+- Auth failures: verify credentials and that the server requires/authenticates them.
+- Connection errors: verify the base URL is reachable from your machine.
diff --git a/examples/rfsclient/auth_and_upload.rhai b/examples/rfsclient/auth_and_upload.rhai
index 46d8879..b400f55 100644
--- a/examples/rfsclient/auth_and_upload.rhai
+++ b/examples/rfsclient/auth_and_upload.rhai
@@ -4,13 +4,13 @@
 // - Valid credentials in env: RFS_USER, RFS_PASS
 // - Run with herodo so the SAL Rhai modules are registered
 
-let BASE_URL = env_get("RFS_BASE_URL");
-let USER = env_get("RFS_USER");
-let PASS = env_get("RFS_PASS");
+// NOTE: env_get not available in this runtime; hardcode or replace with your env loader
+let BASE_URL = "http://127.0.0.1:8080";
+let USER = "user";
+let PASS = "password";
 let TIMEOUT = 30; // seconds
 
-if BASE_URL == null || BASE_URL == "" { throw "Set RFS_BASE_URL in your environment"; }
-if USER == null || PASS == null { throw "Set RFS_USER and RFS_PASS in your environment"; }
+if BASE_URL == "" { throw "Set BASE_URL in the script"; }
 
 // Create client
 let ok = rfs_create_client(BASE_URL, USER, PASS, TIMEOUT);
@@ -25,15 +25,16 @@ let auth_ok = rfs_authenticate();
 if !auth_ok { throw "Authentication failed"; }
 
 // Upload a local file
-let local_file = "/tmp/rfs_example.txt";
-os_write_file(local_file, "hello rfs");
-let hash = rfs_upload_file(local_file);
+// Use an existing readable file to avoid needing os_write_file module
+let local_file = "/etc/hosts";
+// rfs_upload_file(file_path, chunk_size, verify)
+let hash = rfs_upload_file(local_file, 0, false);
 print(`Uploaded file hash: ${hash}`);
 
 // Download it back
 let out_path = "/tmp/rfs_example_out.txt";
-let dl_ok = rfs_download_file(hash, out_path);
-if !dl_ok { throw "Download failed"; }
+// rfs_download_file(file_id, output_path, verify) returns unit and throws on error
+rfs_download_file(hash, out_path, false);
 
 print(`Downloaded to: ${out_path}`);