diff --git a/bin/u_agent/src/lib.rs b/bin/u_agent/src/lib.rs
index eeb1b0d..946afc9 100644
--- a/bin/u_agent/src/lib.rs
+++ b/bin/u_agent/src/lib.rs
@@ -8,14 +8,18 @@ extern crate log;
 extern crate env_logger;
 
 use std::env;
+use std::panic;
+use std::sync::Arc;
 use tokio::time::{sleep, Duration};
 use u_lib::{
     api::ClientHandler,
     builder::JobBuilder,
     cache::JobCache,
+    errors::ErrChan,
     executor::pop_completed,
     messaging::Reportable,
     models::AssignedJob,
+    UError,
     UID,
     //daemonize
 };
@@ -26,12 +30,12 @@ pub async fn process_request(job_requests: Vec<AssignedJob>, client: &ClientHand
     if job_requests.len() > 0 {
         for jr in &job_requests {
             if !JobCache::contains(&jr.job_id) {
-                info!("Fetching job: {}", &jr.job_id);
+                debug!("Fetching job: {}", &jr.job_id);
                 let fetched_job = loop {
                     match client.get_jobs(Some(jr.job_id)).await {
                         Ok(mut result) => break result.pop().unwrap(),
                         Err(err) => {
-                            error!("{:?} \nretrying...", err);
+                            debug!("{:?} \nretrying...", err);
                             sleep(Duration::from_secs(ITERATION_LATENCY)).await;
                         }
                     }
@@ -39,7 +43,7 @@ pub async fn process_request(job_requests: Vec<AssignedJob>, client: &ClientHand
                 JobCache::insert(fetched_job);
             }
         }
-        info!(
+        debug!(
             "Scheduling jobs: {}",
             job_requests
                 .iter()
@@ -50,41 +54,56 @@ pub async fn process_request(job_requests: Vec<AssignedJob>, client: &ClientHand
         let mut builder = JobBuilder::from_request(job_requests);
         let errors = builder.pop_errors();
         if errors.len() > 0 {
-            error!(
-                "Some errors encountered: \n{}",
-                errors
-                    .iter()
-                    .map(|j| j.to_string())
-                    .collect::<Vec<String>>()
-                    .join("\n")
-            );
+            errors.into_iter().for_each(ErrChan::send)
         }
         builder.unwrap_one().spawn().await;
     }
 }
 
-pub async fn run_forever() {
-    //daemonize();
-    env_logger::init();
-    let arg_ip = env::args().nth(1);
-    let client = ClientHandler::new(arg_ip.as_deref());
-    info!("Connecting to the server");
+async fn error_reporting(client: Arc<ClientHandler>) {
+    loop {
+        let err = ErrChan::recv();
+        debug!("Error encountered: {:?}", err);
+        'retry: for _ in 0..3 {
+            match client.report(&[Reportable::Error(err.to_string())]).await {
+                Ok(_) => break 'retry,
+                Err(e) => {
+                    debug!("Reporting error: {:?}", e);
+                    sleep(Duration::from_secs(10)).await;
+                }
+            }
+        }
+    }
+}
+
+async fn do_stuff(client: Arc<ClientHandler>) -> ! {
     loop {
         match client.get_personal_jobs(Some(*UID)).await {
             Ok(resp) => {
                 let job_requests = resp.into_builtin_vec();
                 process_request(job_requests, &client).await;
             }
-            Err(err) => {
-                error!("{:?}", err);
-            }
+            Err(err) => ErrChan::send(err),
         }
         let result: Vec<Reportable> = pop_completed().await.into_iter().collect();
         if result.len() > 0 {
             if let Err(err) = client.report(&result).await {
-                error!("{:?}", err);
+                ErrChan::send(err)
             }
         }
         sleep(Duration::from_secs(ITERATION_LATENCY)).await;
     }
 }
+
+pub async fn run_forever() {
+    //daemonize();
+    env_logger::init();
+    let arg_ip = env::args().nth(1);
+    let client = Arc::new(ClientHandler::new(arg_ip.as_deref()));
+    let _cli = client.clone();
+    panic::set_hook(Box::new(|panic_info| {
+        ErrChan::send(UError::Panic(panic_info.to_string()))
+    }));
+    tokio::spawn(error_reporting(_cli));
+    do_stuff(client).await;
+}
diff --git a/bin/u_server/src/filters.rs b/bin/u_server/src/filters.rs
index 126f11b..20ba803 100644
--- a/bin/u_server/src/filters.rs
+++ b/bin/u_server/src/filters.rs
@@ -70,7 +70,11 @@ pub fn make_filters() -> impl Filter<Extract = (impl Reply,), Error = Rejection>
         .and(warp::path("report"))
         .and(get_content::<Vec<Reportable>>().and_then(Endpoints::report));
 
-    let auth_token = format!("Bearer {}", env::var("ADMIN_AUTH_TOKEN").unwrap()).into_boxed_str();
+    let auth_token = format!(
+        "Bearer {}",
+        env::var("ADMIN_AUTH_TOKEN").expect("No auth token provided")
+    )
+    .into_boxed_str();
     let auth_header = warp::header::exact("authorization", Box::leak(auth_token));
 
     let auth_zone = (get_agents
diff --git a/bin/u_server/src/handlers.rs b/bin/u_server/src/handlers.rs
index d769206..cdf9e47 100644
--- a/bin/u_server/src/handlers.rs
+++ b/bin/u_server/src/handlers.rs
@@ -5,7 +5,7 @@ use serde::Serialize;
 use u_lib::{
     messaging::{AsMsg, BaseMessage, Reportable},
     models::*,
-    utils::OneOrVec,
+    utils::{OneOrVec, Stripped},
     ULocalError,
 };
 use uuid::Uuid;
@@ -162,6 +162,11 @@ impl Endpoints {
                 }
                 Reportable::Error(e) => {
                     let err = AgentError::from_msg(e, id);
+                    warn!(
+                        "{} reported an error: {}",
+                        err.agent_id,
+                        Stripped(&err.msg.as_str())
+                    );
                     UDB::lock_db().report_error(&err).unwrap();
                 }
                 Reportable::Dummy => (),
diff --git a/bin/u_server/src/u_server.rs b/bin/u_server/src/u_server.rs
index e246bca..71d8185 100644
--- a/bin/u_server/src/u_server.rs
+++ b/bin/u_server/src/u_server.rs
@@ -1,22 +1,24 @@
 #[macro_use]
 extern crate log;
 
-#[macro_use]
+#[cfg_attr(test, macro_use)]
 extern crate mockall;
-#[macro_use]
+#[cfg_attr(test, macro_use)]
 extern crate mockall_double;
 
-// because of linking errors
+// due to linking errors
 extern crate openssl;
-#[macro_use]
+// don't touch anything
 extern crate diesel;
-//
+// in this block
+
 mod db;
 mod filters;
 mod handlers;
 
 use db::UDB;
 use filters::make_filters;
+use std::path::PathBuf;
 use u_lib::{config::MASTER_PORT, models::*, utils::init_env};
 use warp::Filter;
 
@@ -28,7 +30,7 @@ fn prefill_jobs() {
         .with_alias("agent_hello")
         .build()
         .unwrap();
-    UDB::lock_db().insert_jobs(&[agent_hello]).ok();
+    UDB::lock_db().insert_jobs(&[agent_hello]).unwrap();
 }
 
 fn init_logger() {
@@ -60,11 +62,12 @@ fn init_all() {
 pub async fn serve() {
     init_all();
     let routes = make_filters();
+    let certs_dir = PathBuf::from("certs");
     warp::serve(routes.with(warp::log("warp")))
         .tls()
-        .cert_path("./certs/server.crt")
-        .key_path("./certs/server.key")
-        .client_auth_required_path("./certs/ca.crt")
+        .cert_path(certs_dir.join("server.crt"))
+        .key_path(certs_dir.join("server.key"))
+        .client_auth_required_path(certs_dir.join("ca.crt"))
         .run(([0, 0, 0, 0], MASTER_PORT))
         .await;
 }
diff --git a/integration/tests/helpers/panel.rs b/integration/tests/helpers/panel.rs
index 41008f9..2c61245 100644
--- a/integration/tests/helpers/panel.rs
+++ b/integration/tests/helpers/panel.rs
@@ -2,7 +2,7 @@ use serde::de::DeserializeOwned;
 use serde_json::from_slice;
 use shlex::split;
 use std::process::{Command, Output};
-use u_lib::{datatypes::DataResult, messaging::AsMsg};
+use u_lib::{datatypes::DataResult, messaging::AsMsg, utils::VecDisplay};
 
 const PANEL_BINARY: &str = "/u_panel";
 
@@ -21,8 +21,13 @@ impl Panel {
 
     pub fn output_argv<T: AsMsg + DeserializeOwned>(args: &[&str]) -> PanelResult<T> {
         let result = Self::run(args);
-        assert!(result.status.success());
-        from_slice(&result.stdout).map_err(|e| e.to_string())
+        from_slice(&result.stdout).map_err(|e| {
+            eprintln!(
+                "Failed to decode panel response: '{}'",
+                VecDisplay(result.stdout)
+            );
+            e.to_string()
+        })
     }
 
     pub fn output<T: AsMsg + DeserializeOwned>(args: impl Into<String>) -> PanelResult<T> {
@@ -39,7 +44,7 @@ impl Panel {
     fn status_is_ok<T: AsMsg + DeserializeOwned>(data: PanelResult<T>) -> T {
         match data.unwrap() {
             DataResult::Ok(r) => r,
-            DataResult::Err(e) => panic!("Panel failed with erroneous status: {}", e),
+            DataResult::Err(e) => panic!("Panel failed: {}", e),
         }
     }
 
diff --git a/lib/u_api_proc_macro/src/lib.rs b/lib/u_api_proc_macro/src/lib.rs
index 46f1efa..f3d3a94 100644
--- a/lib/u_api_proc_macro/src/lib.rs
+++ b/lib/u_api_proc_macro/src/lib.rs
@@ -69,7 +69,7 @@ pub fn api_route(args: TokenStream, item: TokenStream) -> TokenStream {
                 Ok(_) => Ok(()),
                 Err(e) => Err(UError::from(e))
             };
-            match is_success {
+            let result = match is_success {
                 Ok(_) => response.json::<BaseMessage<#return_ty>>()
                     .await
                     .map(|msg| msg.into_inner())
@@ -82,14 +82,14 @@ pub fn api_route(args: TokenStream, item: TokenStream) -> TokenStream {
                 Err(UError::NetError(err_src, _)) => Err(
                     UError::NetError(
                         err_src,
-                        response.text().await.unwrap()
+                        response.text().await?
                     )
                 ),
                 _ => unreachable!()
-            }
+            };
+            Ok(result?)
         }
     };
-    //eprintln!("#!#! RESULT:\n{}", q);
     q.into()
 }
 
diff --git a/lib/u_lib/Cargo.toml b/lib/u_lib/Cargo.toml
index 5d56eff..6d66582 100644
--- a/lib/u_lib/Cargo.toml
+++ b/lib/u_lib/Cargo.toml
@@ -28,10 +28,13 @@ strum = { version = "0.20", features = ["derive"] }
 once_cell = "1.7.2"
 shlex = "1.0.0"
 u_api_proc_macro = { version = "*", path = "../u_api_proc_macro" }
+crossbeam = "0.8.1"
+backtrace = "0.3.61" 
 
 [dependencies.diesel]
 version = "1.4.5"
 features = ["postgres", "uuid"]
 
 [dev-dependencies]
-test-case = "1.1.0"
\ No newline at end of file
+test-case = "1.1.0"
+rstest = "0.11"
diff --git a/lib/u_lib/src/builder.rs b/lib/u_lib/src/builder.rs
index 4075a24..726d74a 100644
--- a/lib/u_lib/src/builder.rs
+++ b/lib/u_lib/src/builder.rs
@@ -1,9 +1,4 @@
-use crate::{
-    UError, UResult, cache::JobCache, executor::{Waiter, DynFut}, 
-    models::{Agent, AssignedJob, JobMeta, JobType},
-    messaging::Reportable, 
-    utils::{CombinedResult, OneOrVec}
-};
+use crate::{UError, UErrorBt, UResult, cache::JobCache, executor::{Waiter, DynFut}, messaging::Reportable, models::{Agent, AssignedJob, JobMeta, JobType}, utils::{CombinedResult, OneOrVec}};
 use guess_host_triple::guess_host_triple;
 use std::collections::HashMap;
 
@@ -15,11 +10,11 @@ impl JobBuilder {
     pub fn from_request(job_requests: impl OneOrVec<AssignedJob>) -> CombinedResult<Self> {
         let job_requests = job_requests.into_vec();
         let mut prepared: Vec<DynFut> = vec![];
-        let mut result = CombinedResult::new();
+        let mut result = CombinedResult::<JobBuilder, UErrorBt>::new();
         for req in job_requests {
             let job_meta = JobCache::get(&req.job_id);
             if job_meta.is_none() {
-                result.err(UError::NoJob(req.job_id));
+                result.err(UError::NoJob(req.job_id).into_bt());
                 continue;
             }
             let job_meta = job_meta.unwrap();
@@ -29,12 +24,12 @@ impl JobBuilder {
                     JobType::Shell => {
                         let meta = JobCache::get(&req.job_id).ok_or(UError::NoJob(req.job_id))?;
                         let curr_platform = guess_host_triple().unwrap_or("unknown").to_string();
-                        //extend platform checking (partial check)
+                        //TODO: extend platform checking (partial check)
                         if meta.platform != curr_platform {
                             return Err(UError::InsuitablePlatform(
                                 meta.platform.clone(),
                                 curr_platform,
-                            ));
+                            ).into());
                         }
                         let job = AssignedJob::new(req.job_id, Some(&req));
                         prepared.push(Box::pin(job.run()))
@@ -211,7 +206,7 @@ mod tests {
         if let Some(p) = payload {
             job = job.with_payload(p);
         }
-        let job = job.build().unwrap(); 
+        let job = job.build().unwrap();
         let job_result = JobBuilder::from_meta(job).unwrap_one().wait_one().await;
         let result = unwrap_enum!(job_result, Reportable::Assigned);
         let result = result.to_string_result();
@@ -298,7 +293,7 @@ mod tests {
             job = job.with_payload(p);
         }
         let err = job.build().unwrap_err();
-        let err_msg = unwrap_enum!(err, UError::JobArgsError);
+        let err_msg = unwrap_enum!(err.err, UError::JobArgsError);
         assert!(err_msg.contains(err_str));
         Ok(())
     }
diff --git a/lib/u_lib/src/cache.rs b/lib/u_lib/src/cache.rs
index a486906..3af1724 100644
--- a/lib/u_lib/src/cache.rs
+++ b/lib/u_lib/src/cache.rs
@@ -1,4 +1,5 @@
 use crate::models::JobMeta;
+use lazy_static::lazy_static;
 use std::{
     collections::HashMap,
     ops::Deref,
diff --git a/lib/u_lib/src/config.rs b/lib/u_lib/src/config.rs
index 88fc795..1fd815c 100644
--- a/lib/u_lib/src/config.rs
+++ b/lib/u_lib/src/config.rs
@@ -1,3 +1,4 @@
+use lazy_static::lazy_static;
 use uuid::Uuid;
 
 pub const MASTER_SERVER: &str = "127.0.0.1"; //Ipv4Addr::new(3,9,16,40)
diff --git a/lib/u_lib/src/datatypes.rs b/lib/u_lib/src/datatypes.rs
index d980734..983747f 100644
--- a/lib/u_lib/src/datatypes.rs
+++ b/lib/u_lib/src/datatypes.rs
@@ -1,4 +1,4 @@
-use crate::UError;
+use crate::UErrorBt;
 use serde::{Deserialize, Serialize};
 
 #[derive(Serialize, Deserialize)]
@@ -6,5 +6,5 @@ use serde::{Deserialize, Serialize};
 #[serde(tag = "status", content = "data")]
 pub enum DataResult<M> {
     Ok(M),
-    Err(UError),
+    Err(UErrorBt),
 }
diff --git a/lib/u_lib/src/errors/chan.rs b/lib/u_lib/src/errors/chan.rs
new file mode 100644
index 0000000..cf78fd0
--- /dev/null
+++ b/lib/u_lib/src/errors/chan.rs
@@ -0,0 +1,28 @@
+use crate::UErrorBt;
+use crossbeam::channel::{self, Receiver, Sender};
+use once_cell::sync::OnceCell;
+
+type ChanError = UErrorBt;
+static ERR_CHAN: OnceCell<ErrChan> = OnceCell::new();
+
+pub struct ErrChan {
+    tx: Sender<ChanError>,
+    rx: Receiver<ChanError>,
+}
+
+impl ErrChan {
+    fn get() -> &'static Self {
+        ERR_CHAN.get_or_init(|| {
+            let (tx, rx) = channel::bounded(20);
+            Self { tx, rx }
+        })
+    }
+
+    pub fn send(msg: impl Into<UErrorBt>) {
+        Self::get().tx.send(msg.into()).unwrap()
+    }
+
+    pub fn recv() -> ChanError {
+        Self::get().rx.recv().unwrap()
+    }
+}
diff --git a/lib/u_lib/src/errors/mod.rs b/lib/u_lib/src/errors/mod.rs
new file mode 100644
index 0000000..c910a5a
--- /dev/null
+++ b/lib/u_lib/src/errors/mod.rs
@@ -0,0 +1,5 @@
+mod chan;
+mod variants;
+
+pub use chan::*;
+pub use variants::*;
diff --git a/lib/u_lib/src/errors.rs b/lib/u_lib/src/errors/variants.rs
similarity index 55%
rename from lib/u_lib/src/errors.rs
rename to lib/u_lib/src/errors/variants.rs
index 5f46197..2b2570d 100644
--- a/lib/u_lib/src/errors.rs
+++ b/lib/u_lib/src/errors/variants.rs
@@ -1,16 +1,39 @@
+use backtrace::Backtrace as CrateBacktrace;
 use diesel::result::Error as DslError;
 use reqwest::Error as ReqError;
 use serde::{Deserialize, Serialize};
+use std::fmt;
 use thiserror::Error;
 use uuid::Uuid;
 
-pub type UResult<T> = std::result::Result<T, UError>;
+pub type UResult<T> = std::result::Result<T, UErrorBt>;
 pub type ULocalResult<T> = std::result::Result<T, ULocalError>;
 
+#[derive(Error, Debug, Serialize, Deserialize, Clone)]
+pub struct UErrorBt {
+    pub err: UError,
+    pub backtrace: String,
+}
+
+impl fmt::Display for UErrorBt {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}\nBACKTRACE: \n{:?}", self.err, self.backtrace)
+    }
+}
+
+impl From<UError> for UErrorBt {
+    fn from(err: UError) -> UErrorBt {
+        UErrorBt {
+            err,
+            backtrace: format!("{:?}", CrateBacktrace::new()),
+        }
+    }
+}
+
 #[derive(Error, Debug, Serialize, Deserialize, Clone)]
 pub enum UError {
-    #[error("Error: {0}")]
-    Raw(String),
+    #[error("Runtime error: {0}")]
+    Runtime(String),
 
     #[error("Connection error: {0}. Body: {1}")]
     NetError(String, String),
@@ -33,11 +56,26 @@ pub enum UError {
     #[error("Job {0} doesn't exist")]
     NoJob(Uuid),
 
-    #[error("Error opening {0}: {1}")]
+    #[error("Error while processing {0}: {1}")]
     FSError(String, String),
 
     #[error("Wrong auth token")]
     WrongToken,
+
+    #[error("Panicked: {0}")]
+    Panic(String),
+}
+
+impl UError {
+    pub fn into_bt(self) -> UErrorBt {
+        UErrorBt::from(self)
+    }
+}
+
+impl From<ReqError> for UErrorBt {
+    fn from(e: ReqError) -> Self {
+        UError::from(e).into_bt()
+    }
 }
 
 impl From<ReqError> for UError {
diff --git a/lib/u_lib/src/executor.rs b/lib/u_lib/src/executor.rs
index 4155cf1..dc4bc79 100644
--- a/lib/u_lib/src/executor.rs
+++ b/lib/u_lib/src/executor.rs
@@ -55,12 +55,12 @@ impl Waiter {
                 tx.send(fid).await.unwrap();
                 result
             };
-            let handle = JoinInfo {
+            let handler = JoinInfo {
                 handle: spawn(task_wrapper),
                 completed: false,
                 collectable,
             };
-            FUT_RESULTS.lock().await.insert(fid, handle);
+            FUT_RESULTS.lock().await.insert(fid, handler);
         }
         self
     }
@@ -147,9 +147,9 @@ mod tests {
             })
         };
         assert_eq!(0, *val.lock().await);
-        spawn(async {}).await.ok();
+        spawn(async {}).await.unwrap();
         assert_eq!(5, *val.lock().await);
-        t.await.ok();
+        t.await.unwrap();
         assert_eq!(5, *val.lock().await);
     }
 }
diff --git a/lib/u_lib/src/lib.rs b/lib/u_lib/src/lib.rs
index 55f4e1e..c614b47 100644
--- a/lib/u_lib/src/lib.rs
+++ b/lib/u_lib/src/lib.rs
@@ -11,16 +11,13 @@ pub mod models;
 pub mod utils;
 
 pub use config::UID;
-pub use errors::{UError, ULocalError, ULocalResult, UResult};
+pub use errors::{UError, UErrorBt, ULocalError, ULocalResult, UResult};
 
 pub mod schema_exports {
     pub use crate::models::{Agentstate, Jobstate, Jobtype};
     pub use diesel::sql_types::*;
 }
 
-#[macro_use]
-extern crate lazy_static;
-
 #[macro_use]
 extern crate diesel;
 
diff --git a/lib/u_lib/src/models/errors.rs b/lib/u_lib/src/models/error.rs
similarity index 100%
rename from lib/u_lib/src/models/errors.rs
rename to lib/u_lib/src/models/error.rs
diff --git a/lib/u_lib/src/models/jobs/assigned.rs b/lib/u_lib/src/models/jobs/assigned.rs
index a4a0d35..a75d88c 100644
--- a/lib/u_lib/src/models/jobs/assigned.rs
+++ b/lib/u_lib/src/models/jobs/assigned.rs
@@ -1,6 +1,7 @@
 use super::JobState;
 use crate::{
     cache::JobCache,
+    errors::UError,
     messaging::Reportable,
     models::{schema::*, JobOutput},
     utils::{systime_to_string, TempFile},
@@ -78,16 +79,22 @@ impl AssignedJob {
     pub async fn run(mut self) -> Reportable {
         let (argv, _payload) = {
             let meta = JobCache::get(&self.job_id).unwrap();
-            let extracted_payload = meta
-                .payload
-                .as_ref()
-                .and_then(|p| TempFile::write_exec(p).ok());
-            let argv = if let Some(ref p) = &extracted_payload {
-                meta.argv.replace("{}", &p.get_path())
+            if let Some(ref payload) = meta.payload {
+                let extracted_payload = match TempFile::write_exec(payload) {
+                    Ok(p) => p,
+                    Err(e) => {
+                        return Reportable::Error(
+                            UError::Runtime(e.to_string()).into_bt().to_string(),
+                        )
+                    }
+                };
+                (
+                    meta.argv.replace("{}", &extracted_payload.get_path()),
+                    Some(extracted_payload),
+                )
             } else {
-                meta.argv.clone()
-            };
-            (argv, extracted_payload)
+                (meta.argv.clone(), None)
+            }
         };
         let mut split_cmd = shlex::split(&argv).unwrap().into_iter();
         let cmd = split_cmd.nth(0).unwrap();
diff --git a/lib/u_lib/src/models/jobs/meta.rs b/lib/u_lib/src/models/jobs/meta.rs
index 4cb07cc..79bce50 100644
--- a/lib/u_lib/src/models/jobs/meta.rs
+++ b/lib/u_lib/src/models/jobs/meta.rs
@@ -1,9 +1,10 @@
 use super::JobType;
-use crate::{models::schema::*, UError, UResult};
+use crate::{models::schema::*, utils::Stripped, UError, UResult};
 use diesel::{Identifiable, Insertable, Queryable};
 use guess_host_triple::guess_host_triple;
 use serde::{Deserialize, Serialize};
 use std::fmt;
+use std::str::from_utf8;
 use uuid::Uuid;
 
 #[derive(Serialize, Deserialize, Clone, Debug, Queryable, Identifiable, Insertable)]
@@ -41,20 +42,12 @@ impl fmt::Display for JobMeta {
         out += &format!("\nPlatform: {}", self.platform);
         if let Some(ref payload) = self.payload {
             if self.exec_type == JobType::Shell {
-                let (pld_len, large) = {
-                    let pl = payload.len();
-                    if pl > 20 {
-                        (20, true)
-                    } else {
-                        (pl, false)
-                    }
+                let payload = if let Ok(str_payload) = from_utf8(payload) {
+                    Stripped(&str_payload).to_string()
+                } else {
+                    Stripped(&payload).to_string()
                 };
-                let pld_beginning = &payload[..pld_len];
-                out += &format!(
-                    "\nPayload: {}{}",
-                    String::from_utf8_lossy(pld_beginning),
-                    if large { "" } else { " <...>" }
-                );
+                out += &format!("\nPayload: {}", payload);
             }
         }
         write!(f, "{}", out)
@@ -118,14 +111,15 @@ impl JobMetaBuilder {
                     shlex::split(&inner.argv).ok_or(UError::JobArgsError("Shlex failed".into()))?;
                 let empty_err = UError::JobArgsError("Empty argv".into());
                 if argv_parts.get(0).ok_or(empty_err.clone())?.len() == 0 {
-                    return Err(empty_err);
+                    return Err(empty_err.into());
                 }
                 match inner.payload.as_ref() {
                     Some(_) => {
                         if !inner.argv.contains("{}") {
                             return Err(UError::JobArgsError(
                                 "Argv contains no executable placeholder".into(),
-                            ));
+                            )
+                            .into());
                         } else {
                             ()
                         }
@@ -135,7 +129,8 @@ impl JobMetaBuilder {
                             return Err(UError::JobArgsError(
                                 "No payload provided, but argv contains executable placeholder"
                                     .into(),
-                            ));
+                            )
+                            .into());
                         } else {
                             ()
                         }
diff --git a/lib/u_lib/src/models/mod.rs b/lib/u_lib/src/models/mod.rs
index bd44781..3178567 100644
--- a/lib/u_lib/src/models/mod.rs
+++ b/lib/u_lib/src/models/mod.rs
@@ -1,6 +1,6 @@
 mod agent;
-mod errors;
+mod error;
 mod jobs;
 pub mod schema;
 
-pub use crate::models::{agent::*, errors::*, jobs::*};
+pub use crate::models::{agent::*, error::*, jobs::*};
diff --git a/lib/u_lib/src/utils/combined_result.rs b/lib/u_lib/src/utils/combined_result.rs
index 2baf35f..aa0968d 100644
--- a/lib/u_lib/src/utils/combined_result.rs
+++ b/lib/u_lib/src/utils/combined_result.rs
@@ -1,7 +1,7 @@
 use crate::utils::OneOrVec;
-use crate::UError;
+use crate::UErrorBt;
 
-pub struct CombinedResult<T, E = UError> {
+pub struct CombinedResult<T, E = UErrorBt> {
     ok: Vec<T>,
     err: Vec<E>,
 }
diff --git a/lib/u_lib/src/utils/hexlify.rs b/lib/u_lib/src/utils/fmt/hexlify.rs
similarity index 52%
rename from lib/u_lib/src/utils/hexlify.rs
rename to lib/u_lib/src/utils/fmt/hexlify.rs
index d3a0d14..69bda69 100644
--- a/lib/u_lib/src/utils/hexlify.rs
+++ b/lib/u_lib/src/utils/fmt/hexlify.rs
@@ -10,3 +10,15 @@ impl<'a> fmt::LowerHex for Hexlify<'a> {
         Ok(())
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_hexlify() {
+        let data = b"\x5a\x6b\x23\x4f\xa3\x7f\x9e";
+        let result = "5a6b234fa37f9e";
+        assert_eq!(format!("{:x}", Hexlify(data)), result);
+    }
+}
diff --git a/lib/u_lib/src/utils/fmt/mod.rs b/lib/u_lib/src/utils/fmt/mod.rs
new file mode 100644
index 0000000..aa14890
--- /dev/null
+++ b/lib/u_lib/src/utils/fmt/mod.rs
@@ -0,0 +1,5 @@
+mod hexlify;
+mod stripped;
+
+pub use hexlify::*;
+pub use stripped::*;
diff --git a/lib/u_lib/src/utils/fmt/stripped.rs b/lib/u_lib/src/utils/fmt/stripped.rs
new file mode 100644
index 0000000..8681a97
--- /dev/null
+++ b/lib/u_lib/src/utils/fmt/stripped.rs
@@ -0,0 +1,80 @@
+use std::fmt;
+use std::iter::Iterator;
+use std::slice::Iter as SliceIter;
+use std::str::Chars;
+
+const MAX_DATA_LEN: usize = 200;
+
+pub trait Strippable {
+    //TODO: waiting for stabilizing GATs
+    type Item: fmt::Display;
+    type TypeIter: Iterator<Item = Self::Item>;
+
+    fn length(&self) -> usize;
+    fn iterator(&self) -> Self::TypeIter;
+}
+
+impl<'a> Strippable for &'a str {
+    type Item = char;
+    type TypeIter = Chars<'a>;
+
+    fn length(&self) -> usize {
+        self.len()
+    }
+
+    fn iterator(&self) -> Self::TypeIter {
+        self.chars()
+    }
+}
+
+impl<'a> Strippable for &'a Vec<u8> {
+    type Item = &'a u8;
+    type TypeIter = SliceIter<'a, u8>;
+
+    fn length(&self) -> usize {
+        self.len()
+    }
+
+    fn iterator(&self) -> Self::TypeIter {
+        self.iter()
+    }
+}
+pub struct Stripped<'inner, Inner: Strippable + 'inner>(pub &'inner Inner);
+
+impl<'inner, Inner: Strippable + 'inner> Stripped<'inner, Inner> {
+    fn iter(&self) -> Inner::TypeIter {
+        self.0.iterator()
+    }
+
+    fn placeholder(&self) -> &'static str {
+        if self.0.length() >= MAX_DATA_LEN {
+            " <...>"
+        } else {
+            ""
+        }
+    }
+}
+
+impl<'inner, Inner: Strippable + 'inner> fmt::Display for Stripped<'inner, Inner> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        let placeholder = self.placeholder();
+        for c in self.iter().take(MAX_DATA_LEN - placeholder.len()) {
+            write!(f, "{}", c)?;
+        }
+        write!(f, "{}", placeholder)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use rstest::*;
+
+    #[rstest]
+    #[case("abc", 3)]
+    #[case("abcde".repeat(50), MAX_DATA_LEN)]
+    fn test_strip(#[case] input: impl Into<String>, #[case] result_len: usize) {
+        let s = input.into();
+        assert_eq!(Stripped(&s.as_str()).to_string().len(), result_len);
+    }
+}
diff --git a/lib/u_lib/src/utils/misc.rs b/lib/u_lib/src/utils/misc.rs
index 375a6ad..3025f24 100644
--- a/lib/u_lib/src/utils/misc.rs
+++ b/lib/u_lib/src/utils/misc.rs
@@ -22,7 +22,7 @@ impl<T> OneOrVec<T> for Vec<T> {
 
 #[macro_export]
 macro_rules! unwrap_enum {
-    ($src:ident, $t:path) => {
+    ($src:expr, $t:path) => {
         if let $t(result) = $src {
             result
         } else {
diff --git a/lib/u_lib/src/utils/mod.rs b/lib/u_lib/src/utils/mod.rs
index 0082b16..98853c2 100644
--- a/lib/u_lib/src/utils/mod.rs
+++ b/lib/u_lib/src/utils/mod.rs
@@ -1,6 +1,6 @@
 mod combined_result;
 mod conv;
-mod hexlify;
+mod fmt;
 mod misc;
 mod storage;
 mod tempfile;
@@ -8,7 +8,7 @@ mod vec_display;
 
 pub use combined_result::*;
 pub use conv::*;
-pub use hexlify::*;
+pub use fmt::*;
 pub use misc::*;
 pub use storage::*;
 pub use tempfile::*;
diff --git a/lib/u_lib/src/utils/tempfile.rs b/lib/u_lib/src/utils/tempfile.rs
index e76baa8..209ea46 100644
--- a/lib/u_lib/src/utils/tempfile.rs
+++ b/lib/u_lib/src/utils/tempfile.rs
@@ -1,3 +1,4 @@
+use crate::{UError, UResult};
 use std::{env::temp_dir, fs, ops::Drop, os::unix::fs::PermissionsExt, path::PathBuf};
 use uuid::Uuid;
 
@@ -17,16 +18,17 @@ impl TempFile {
         Self { path }
     }
 
-    pub fn write_all(&self, data: &[u8]) -> Result<(), String> {
-        fs::write(&self.path, data).map_err(|e| e.to_string())
+    pub fn write_all(&self, data: &[u8]) -> UResult<()> {
+        fs::write(&self.path, data).map_err(|e| UError::FSError(self.get_path(), e.to_string()))?;
+        Ok(())
     }
 
-    pub fn write_exec(data: &[u8]) -> Result<Self, (String, String)> {
+    pub fn write_exec(data: &[u8]) -> UResult<Self> {
         let this = Self::new();
         let path = this.get_path();
-        this.write_all(data).map_err(|e| (path.clone(), e))?;
+        this.write_all(data)?;
         let perms = fs::Permissions::from_mode(0o555);
-        fs::set_permissions(&path, perms).map_err(|e| (path, e.to_string()))?;
+        fs::set_permissions(&path, perms).map_err(|e| UError::FSError(path, e.to_string()))?;
         Ok(this)
     }
 }
diff --git a/scripts/cargo_musl.sh b/scripts/cargo_musl.sh
index 0a8b3aa..e4149ef 100755
--- a/scripts/cargo_musl.sh
+++ b/scripts/cargo_musl.sh
@@ -4,6 +4,7 @@ source $(dirname $0)/rootdir.sh #set ROOTDIR
 ARGS=$@
 docker run \
     --env-file $ROOTDIR/.env \
+    --env-file $ROOTDIR/.env.private \
     -v $ROOTDIR:/volume \
     -v cargo-cache:/root/.cargo/registry \
     -w /volume \