diff --git a/Cargo.toml b/Cargo.toml
index d4c2a11..d6c0192 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -82,6 +82,7 @@ derive_more = { version = "1.0.0-beta.6", features = [
   "from",
 ] }
 derive-with = "0.5"
+thiserror = "1.0"
 
 # file watcher
 inotify = "0.10"
diff --git a/crates/config/Cargo.toml b/crates/config/Cargo.toml
index 6e4e528..11d47e7 100644
--- a/crates/config/Cargo.toml
+++ b/crates/config/Cargo.toml
@@ -44,6 +44,7 @@ ulid = { workspace = true }
 # boilerplate
 derive_more = { workspace = true }
 derive-with = { workspace = true }
+thiserror = { workspace = true }
 #
 # # file watcher
 # inotify = { workspace = true }
diff --git a/crates/config/src/server.rs b/crates/config/src/server.rs
index 7dc43f4..f08f83f 100644
--- a/crates/config/src/server.rs
+++ b/crates/config/src/server.rs
@@ -13,14 +13,17 @@ use tracing::info;
 
 use crate::{ForgeAlias, ForgeConfig, RepoAlias};
 
-#[derive(Debug, derive_more::From, derive_more::Display)]
+#[derive(Debug, thiserror::Error)]
 pub enum Error {
-    Io(std::io::Error),
-    KxIoFs(kxio::fs::Error),
-    TomlDe(toml::de::Error),
-    AddressParse(std::net::AddrParseError),
+    #[error("fs: {0}")]
+    KxioFs(#[from] kxio::fs::Error),
+
+    #[error("deserialise toml: {0}")]
+    TomlDe(#[from] toml::de::Error),
+
+    #[error("parse IP addres/port: {0}")]
+    AddressParse(#[from] std::net::AddrParseError),
 }
-impl std::error::Error for Error {}
 
 type Result<T> = core::result::Result<T, Error>;
 
@@ -39,7 +42,7 @@ impl ServerConfig {
         let file = fs.base().join("git-next-server.toml");
         info!(?file, "");
         let str = fs.file_read_to_string(&file)?;
-        toml::from_str(&str).map_err(Into::into)
+        Ok(toml::from_str(&str)?)
     }
 
     pub fn forges(&self) -> impl Iterator<Item = (ForgeAlias, &ForgeConfig)> {
diff --git a/crates/config/src/tests/mod.rs b/crates/config/src/tests.rs
similarity index 100%
rename from crates/config/src/tests/mod.rs
rename to crates/config/src/tests.rs
diff --git a/crates/config/src/webhook/auth.rs b/crates/config/src/webhook/auth.rs
index ab619b8..2e4e1ff 100644
--- a/crates/config/src/webhook/auth.rs
+++ b/crates/config/src/webhook/auth.rs
@@ -1,9 +1,8 @@
-use std::str::FromStr as _;
-
 #[derive(Clone, Debug, PartialEq, Eq, derive_more::Deref, derive_more::Display)]
 pub struct WebhookAuth(ulid::Ulid);
 impl WebhookAuth {
     pub fn new(authorisation: &str) -> Result<Self, ulid::DecodeError> {
+        use std::str::FromStr as _;
         let id = ulid::Ulid::from_str(authorisation)?;
         tracing::info!("Parse auth token: {}", id);
         Ok(Self(id))
@@ -21,30 +20,3 @@ impl WebhookAuth {
         self.0.to_bytes()
     }
 }
-
-#[cfg(test)]
-mod tests {
-    use crate::WebhookAuth;
-
-    #[test]
-    fn bytes() -> Result<(), Box<dyn std::error::Error>> {
-        let ulid = ulid::Ulid::new();
-
-        let wa = WebhookAuth::new(ulid.to_string().as_str())?;
-
-        assert_eq!(ulid.to_bytes(), wa.to_bytes());
-
-        Ok(())
-    }
-
-    #[test]
-    fn string() -> Result<(), Box<dyn std::error::Error>> {
-        let ulid = ulid::Ulid::new();
-
-        let wa = WebhookAuth::new(ulid.to_string().as_str())?;
-
-        assert_eq!(ulid.to_string(), wa.to_string());
-
-        Ok(())
-    }
-}
diff --git a/crates/config/src/webhook/mod.rs b/crates/config/src/webhook/mod.rs
index 34295c0..91de1c7 100644
--- a/crates/config/src/webhook/mod.rs
+++ b/crates/config/src/webhook/mod.rs
@@ -3,4 +3,7 @@ pub mod id;
 pub mod message;
 pub mod push;
 
+#[cfg(test)]
+mod tests;
+
 pub use push::Push;
diff --git a/crates/config/src/webhook/tests.rs b/crates/config/src/webhook/tests.rs
new file mode 100644
index 0000000..c7e1df4
--- /dev/null
+++ b/crates/config/src/webhook/tests.rs
@@ -0,0 +1,25 @@
+mod auth {
+    use crate::WebhookAuth;
+
+    #[test]
+    fn bytes() -> Result<(), Box<dyn std::error::Error>> {
+        let ulid = ulid::Ulid::new();
+
+        let wa = WebhookAuth::new(ulid.to_string().as_str())?;
+
+        assert_eq!(ulid.to_bytes(), wa.to_bytes());
+
+        Ok(())
+    }
+
+    #[test]
+    fn string() -> Result<(), Box<dyn std::error::Error>> {
+        let ulid = ulid::Ulid::new();
+
+        let wa = WebhookAuth::new(ulid.to_string().as_str())?;
+
+        assert_eq!(ulid.to_string(), wa.to_string());
+
+        Ok(())
+    }
+}