diff --git a/Cargo.lock b/Cargo.lock
index 792d762..92409bc 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,248 @@
 # It is not intended for manual editing.
 version = 4
 
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+dependencies = [
+ "anstyle",
+ "anstyle-parse",
+ "anstyle-query",
+ "anstyle-wincon",
+ "colorchoice",
+ "is_terminal_polyfill",
+ "utf8parse",
+]
+
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+ "windows-sys",
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+ "clap_derive",
+]
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 [[package]]
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+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
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+ "windows_x86_64_msvc",
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diff --git a/Cargo.toml b/Cargo.toml
index a5a6ee7..f99b08b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,12 +1,14 @@
 [workspace]
 resolver = "2"
-members = ["tta"]
+members = ["tta", "tta-cli"]
 
 [workspace.package]
 version = "0.0.0"
 edition = "2021"
 
 [workspace.dependencies]
+clap = { version = "4.5.27", features = ["derive", "deprecated"] }
+tta = { path = "tta" }
 
 [workspace.lints]
 rust.unsafe_code = { level = "forbid", priority = 1 }
diff --git a/tta-cli/Cargo.toml b/tta-cli/Cargo.toml
new file mode 100644
index 0000000..b78b127
--- /dev/null
+++ b/tta-cli/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "tta-cli"
+version = { workspace = true }
+edition = { workspace = true }
+
+[dependencies]
+clap = { workspace = true }
+tta = { workspace = true }
+
+[lints]
+workspace = true
diff --git a/tta-cli/src/main.rs b/tta-cli/src/main.rs
new file mode 100644
index 0000000..38b643f
--- /dev/null
+++ b/tta-cli/src/main.rs
@@ -0,0 +1,11 @@
+use clap::Parser;
+
+#[derive(Parser)]
+struct Args {
+    greetee: String,
+}
+
+fn main() {
+    let args = Args::parse();
+    println!("{}", tta::greet(&args.greetee));
+}