diff --git a/cs/Cargo.lock b/cs/Cargo.lock
index f1ad7ae..a4b5288 100644
--- a/cs/Cargo.lock
+++ b/cs/Cargo.lock
@@ -190,9 +190,9 @@ checksum = "2da6da31387c7e4ef160ffab6d5e7f00c42626fe39aea70a7b0f1773f7dd6c1b"
 
 [[package]]
 name = "collective-score-client"
-version = "0.0.1"
+version = "0.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "09ad4919469cf579f106ffcc9787d4b483aadd0474cdcb21afdcb9c8ba93c1ed"
+checksum = "18bad7c08c5e9754d1b3a09aab531b2a5112ecb241c8bbf7d52c164db5cfab37"
 dependencies = [
  "anyhow",
  "clap",
diff --git a/cs/Cargo.toml b/cs/Cargo.toml
index 24a6fff..33afbf4 100644
--- a/cs/Cargo.toml
+++ b/cs/Cargo.toml
@@ -8,4 +8,4 @@ license = "AGPL-3.0"
 repository = "https://codeberg.org/mo8it/dev-tools"
 
 [dependencies]
-collective-score-client = "0.0.1"
+collective-score-client = "0.0.2"
diff --git a/cs/src/day1/collective_score_intro.rs b/cs/src/day1/collective_score_intro.rs
new file mode 100644
index 0000000..48f8910
--- /dev/null
+++ b/cs/src/day1/collective_score_intro.rs
@@ -0,0 +1,15 @@
+use collective_score_client::{
+    check::{Check, IntoTask, RunnableCheck},
+    validator::{stdin::Stdin, string_content::StringContent},
+};
+
+pub fn task() -> (&'static str, Box<dyn RunnableCheck>) {
+    Check::builder()
+        .description("Checking stdin")
+        .validator(Stdin {
+            expected: StringContent::Full("OK\n"),
+        })
+        .hint("Did you pipe `echo \"OK\"` into this command?")
+        .build()
+        .into_task("collective-score-intro")
+}
diff --git a/cs/src/day1/mod.rs b/cs/src/day1/mod.rs
new file mode 100644
index 0000000..4420809
--- /dev/null
+++ b/cs/src/day1/mod.rs
@@ -0,0 +1,7 @@
+mod collective_score_intro;
+
+use collective_score_client::check::RunnableCheck;
+
+pub fn tasks() -> [(&'static str, Box<dyn RunnableCheck>); 1] {
+    [collective_score_intro::task()]
+}
diff --git a/cs/src/main.rs b/cs/src/main.rs
new file mode 100644
index 0000000..d42349f
--- /dev/null
+++ b/cs/src/main.rs
@@ -0,0 +1,17 @@
+mod day1;
+
+use collective_score_client::run;
+use std::process;
+
+fn main() {
+    let tasks = day1::tasks().into_iter().collect();
+
+    if let Err(e) = run(
+        tasks,
+        "collective-score-dev-tools",
+        "https://collective-score.mo8it.com",
+    ) {
+        eprintln!("{e:?}");
+        process::exit(1);
+    }
+}