diff --git a/Cargo.lock b/Cargo.lock
index 551d0ea..4610c7b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -27,12 +27,46 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9330f8b2ff13f34540b44e946ef35111825727b38d33286ef986142615121801"
 
+[[package]]
+name = "equivalent"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "877a4ace8713b0bcf2a4e7eec82529c029f1d0619886d18145fea96c3ffe5c0f"
+
 [[package]]
 name = "find-msvc-tools"
 version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "52051878f80a721bb68ebfbc930e07b65ba72f2da88968ea5c06fd6ca3d3a127"
 
+[[package]]
+name = "glob"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0cc23270f6e1808e30a928bdc84dea0b9b4136a8bc82338574f23baf47bbd280"
+
+[[package]]
+name = "hashbrown"
+version = "0.17.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed5909b6e89a2db4456e54cd5f673791d7eca6732202bbf2a9cc504fe2f9b84a"
+
+[[package]]
+name = "indexmap"
+version = "2.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d466e9454f08e4a911e14806c24e16fba1b4c121d1ea474396f396069cf949d9"
+dependencies = [
+ "equivalent",
+ "hashbrown",
+]
+
+[[package]]
+name = "itoa"
+version = "1.0.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f42a60cbdf9a97f5d2305f08a87dc4e09308d1276d28c869c684d7777685682"
+
 [[package]]
 name = "libc"
 version = "0.2.177"
@@ -111,6 +145,28 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "serde_json"
+version = "1.0.150"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e8014e44b4736ed0538adeecded0fce2a272f22dc9578a7eb6b2d9993c74cfb9"
+dependencies = [
+ "itoa",
+ "memchr",
+ "serde",
+ "serde_core",
+ "zmij",
+]
+
+[[package]]
+name = "serde_spanned"
+version = "1.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6662b5879511e06e8999a8a235d848113e942c9124f211511b16466ee2995f26"
+dependencies = [
+ "serde_core",
+]
+
 [[package]]
 name = "shlex"
 version = "1.3.0"
@@ -137,6 +193,7 @@ dependencies = [
  "serde",
  "stacker",
  "stacksafe-macro",
+ "trybuild",
 ]
 
 [[package]]
@@ -159,12 +216,90 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "target-triple"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "591ef38edfb78ca4771ee32cf494cb8771944bee237a9b91fc9c1424ac4b777b"
+
+[[package]]
+name = "termcolor"
+version = "1.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "06794f8f6c5c898b3275aebefa6b8a1cb24cd2c6c79397ab15774837a0bc5755"
+dependencies = [
+ "winapi-util",
+]
+
+[[package]]
+name = "toml"
+version = "1.1.2+spec-1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "81f3d15e84cbcd896376e6730314d59fb5a87f31e4b038454184435cd57defee"
+dependencies = [
+ "indexmap",
+ "serde_core",
+ "serde_spanned",
+ "toml_datetime",
+ "toml_parser",
+ "toml_writer",
+ "winnow",
+]
+
+[[package]]
+name = "toml_datetime"
+version = "1.1.1+spec-1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3165f65f62e28e0115a00b2ebdd37eb6f3b641855f9d636d3cd4103767159ad7"
+dependencies = [
+ "serde_core",
+]
+
+[[package]]
+name = "toml_parser"
+version = "1.1.2+spec-1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a2abe9b86193656635d2411dc43050282ca48aa31c2451210f4202550afb7526"
+dependencies = [
+ "winnow",
+]
+
+[[package]]
+name = "toml_writer"
+version = "1.1.1+spec-1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "756daf9b1013ebe47a8776667b466417e2d4c5679d441c26230efd9ef78692db"
+
+[[package]]
+name = "trybuild"
+version = "1.0.116"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "47c635f0191bd3a2941013e5062667100969f8c4e9cd787c14f977265d73616e"
+dependencies = [
+ "glob",
+ "serde",
+ "serde_derive",
+ "serde_json",
+ "target-triple",
+ "termcolor",
+ "toml",
+]
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9312f7c4f6ff9069b165498234ce8be658059c6728633667c526e27dc2cf1df5"
 
+[[package]]
+name = "winapi-util"
+version = "0.1.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c2a7b1c03c876122aa43f3020e6c3c3ee5c05081c9a00739faf7503aeba10d22"
+dependencies = [
+ "windows-sys",
+]
+
 [[package]]
 name = "windows-link"
 version = "0.2.1"
@@ -179,3 +314,15 @@ checksum = "ae137229bcbd6cdf0f7b80a31df61766145077ddf49416a728b02cb3921ff3fc"
 dependencies = [
  "windows-link",
 ]
+
+[[package]]
+name = "winnow"
+version = "1.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0592e1c9d151f854e6fd382574c3a0855250e1d9b2f99d9281c6e6391af352f1"
+
+[[package]]
+name = "zmij"
+version = "1.0.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b8848ee67ecc8aedbaf3e4122217aff892639231befc6a1b58d29fff4c2cabaa"
diff --git a/Cargo.toml b/Cargo.toml
index 1987e28..74e5ce1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -34,3 +34,4 @@ quote = { version = "1.0.45" }
 serde = { version = "1.0.228" }
 stacker = { version = "0.1.24" }
 syn = { version = "2.0.117" }
+trybuild = { version = "1.0.116" }
diff --git a/stacksafe/Cargo.toml b/stacksafe/Cargo.toml
index 1ed968d..dccb4e9 100644
--- a/stacksafe/Cargo.toml
+++ b/stacksafe/Cargo.toml
@@ -39,3 +39,6 @@ serde = ["dep:serde"]
 serde = { workspace = true, optional = true }
 stacker = { workspace = true }
 stacksafe-macro = { workspace = true }
+
+[dev-dependencies]
+trybuild = { workspace = true }
diff --git a/stacksafe/tests/ui.rs b/stacksafe/tests/ui.rs
new file mode 100644
index 0000000..699213a
--- /dev/null
+++ b/stacksafe/tests/ui.rs
@@ -0,0 +1,19 @@
+// Copyright 2025 FastLabs Developers
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#[test]
+fn ui() {
+    let t = trybuild::TestCases::new();
+    t.compile_fail("tests/ui/*.rs");
+}
diff --git a/stacksafe/tests/ui/async_function.rs b/stacksafe/tests/ui/async_function.rs
new file mode 100644
index 0000000..a753fae
--- /dev/null
+++ b/stacksafe/tests/ui/async_function.rs
@@ -0,0 +1,20 @@
+// Copyright 2025 FastLabs Developers
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use stacksafe::stacksafe;
+
+#[stacksafe]
+async fn unsupported() {}
+
+fn main() {}
diff --git a/stacksafe/tests/ui/async_function.stderr b/stacksafe/tests/ui/async_function.stderr
new file mode 100644
index 0000000..94518a9
--- /dev/null
+++ b/stacksafe/tests/ui/async_function.stderr
@@ -0,0 +1,5 @@
+error: #[stacksafe] does not support async functions
+  --> tests/ui/async_function.rs:18:1
+   |
+18 | async fn unsupported() {}
+   | ^^^^^
diff --git a/stacksafe/tests/ui/non_function_item.rs b/stacksafe/tests/ui/non_function_item.rs
new file mode 100644
index 0000000..9110940
--- /dev/null
+++ b/stacksafe/tests/ui/non_function_item.rs
@@ -0,0 +1,20 @@
+// Copyright 2025 FastLabs Developers
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use stacksafe::stacksafe;
+
+#[stacksafe]
+struct NotAFunction;
+
+fn main() {}
diff --git a/stacksafe/tests/ui/non_function_item.stderr b/stacksafe/tests/ui/non_function_item.stderr
new file mode 100644
index 0000000..2d024fe
--- /dev/null
+++ b/stacksafe/tests/ui/non_function_item.stderr
@@ -0,0 +1,7 @@
+error: #[stacksafe] can only be applied to functions
+  --> tests/ui/non_function_item.rs:17:1
+   |
+17 | #[stacksafe]
+   | ^^^^^^^^^^^^
+   |
+   = note: this error originates in the attribute macro `stacksafe` (in Nightly builds, run with -Z macro-backtrace for more info)
diff --git a/stacksafe/tests/ui/unknown_parameter.rs b/stacksafe/tests/ui/unknown_parameter.rs
new file mode 100644
index 0000000..bdb26b3
--- /dev/null
+++ b/stacksafe/tests/ui/unknown_parameter.rs
@@ -0,0 +1,20 @@
+// Copyright 2025 FastLabs Developers
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use stacksafe::stacksafe;
+
+#[stacksafe(unknown = true)]
+fn unsupported() {}
+
+fn main() {}
diff --git a/stacksafe/tests/ui/unknown_parameter.stderr b/stacksafe/tests/ui/unknown_parameter.stderr
new file mode 100644
index 0000000..fd208ae
--- /dev/null
+++ b/stacksafe/tests/ui/unknown_parameter.stderr
@@ -0,0 +1,5 @@
+error: unknown attribute parameter `unknown`
+  --> tests/ui/unknown_parameter.rs:17:13
+   |
+17 | #[stacksafe(unknown = true)]
+   |             ^^^^^^^