diff --git a/tools/aconfig/src/main.rs b/tools/aconfig/src/main.rs
index 9d87ca4..79ac920 100644
--- a/tools/aconfig/src/main.rs
+++ b/tools/aconfig/src/main.rs
@@ -17,22 +17,67 @@
 //! `aconfig` is a build time tool to manage build time configurations, such as feature flags.
 
 use anyhow::Result;
+use clap::{builder::ArgAction, builder::EnumValueParser, Arg, Command};
+use std::fs;
 
 mod aconfig;
+mod cache;
+mod commands;
 mod protos;
 
-use aconfig::{Flag, Override};
+use crate::cache::Cache;
+use commands::{Input, Source};
+
+fn cli() -> Command {
+    Command::new("aconfig")
+        .subcommand_required(true)
+        .subcommand(
+            Command::new("create-cache")
+                .arg(Arg::new("aconfig").long("aconfig").action(ArgAction::Append))
+                .arg(Arg::new("override").long("override").action(ArgAction::Append))
+                .arg(Arg::new("cache").long("cache").required(true)),
+        )
+        .subcommand(
+            Command::new("dump").arg(Arg::new("cache").long("cache").required(true)).arg(
+                Arg::new("format")
+                    .long("format")
+                    .value_parser(EnumValueParser::<commands::Format>::new())
+                    .default_value("text"),
+            ),
+        )
+}
 
 fn main() -> Result<()> {
-    let flag = Flag::try_from_text_proto(r#"id: "a" description: "description of a" value: true"#)?;
-    println!("{:?}", flag);
-    let flags = Flag::try_from_text_proto_list(
-        r#"flag { id: "a" description: "description of a" value: true }"#,
-    )?;
-    println!("{:?}", flags);
-    let override_ = Override::try_from_text_proto(r#"id: "foo" value: true"#)?;
-    println!("{:?}", override_);
-    let overrides = Override::try_from_text_proto_list(r#"override { id: "foo" value: true }"#)?;
-    println!("{:?}", overrides);
+    let matches = cli().get_matches();
+    match matches.subcommand() {
+        Some(("create-cache", sub_matches)) => {
+            let mut aconfigs = vec![];
+            for path in
+                sub_matches.get_many::<String>("aconfig").unwrap_or_default().collect::<Vec<_>>()
+            {
+                let file = Box::new(fs::File::open(path)?);
+                aconfigs.push(Input { source: Source::File(path.to_string()), reader: file });
+            }
+            let mut overrides = vec![];
+            for path in
+                sub_matches.get_many::<String>("override").unwrap_or_default().collect::<Vec<_>>()
+            {
+                let file = Box::new(fs::File::open(path)?);
+                overrides.push(Input { source: Source::File(path.to_string()), reader: file });
+            }
+            let cache = commands::create_cache(aconfigs, overrides)?;
+            let path = sub_matches.get_one::<String>("cache").unwrap();
+            let file = fs::File::create(path)?;
+            cache.write_to_writer(file)?;
+        }
+        Some(("dump", sub_matches)) => {
+            let path = sub_matches.get_one::<String>("cache").unwrap();
+            let file = fs::File::open(path)?;
+            let cache = Cache::read_from_reader(file)?;
+            let format = sub_matches.get_one("format").unwrap();
+            commands::dump_cache(cache, *format)?;
+        }
+        _ => unreachable!(),
+    }
     Ok(())
 }