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diff --git a/Cargo.toml b/Cargo.toml
index 955634f..d6abd6c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,35 @@
-[package]
-name = "xy"
-version = "0.1.0"
-edition = "2024"
+[workspace]
+resolver = "2"
+members = [
+    "crates/xy-protocol",
+    "crates/xy-supervisor",
+    "crates/xy-ipc",
+    "crates/xy",
+]
 
-[dependencies]
+[workspace.package]
+edition = "2024"
+version = "0.1.0"
+license = "MIT OR Apache-2.0"
+
+[workspace.dependencies]
+xy-protocol = { path = "crates/xy-protocol" }
+xy-supervisor = { path = "crates/xy-supervisor" }
+xy-ipc = { path = "crates/xy-ipc" }
+
+tokio = { version = "1", features = ["rt-multi-thread", "net", "process", "signal", "sync", "fs", "io-util", "macros", "time"] }
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diff --git a/crates/xy-ipc/Cargo.toml b/crates/xy-ipc/Cargo.toml
new file mode 100644
index 0000000..f69b7d0
--- /dev/null
+++ b/crates/xy-ipc/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "xy-ipc"
+edition.workspace = true
+version.workspace = true
+license.workspace = true
+
+[dependencies]
+xy-protocol.workspace = true
+tokio.workspace = true
+serde.workspace = true
+serde_json.workspace = true
+tracing.workspace = true
+thiserror.workspace = true
+
+[dev-dependencies]
+tempfile.workspace = true
diff --git a/crates/xy-ipc/src/lib.rs b/crates/xy-ipc/src/lib.rs
new file mode 100644
index 0000000..2ad7623
--- /dev/null
+++ b/crates/xy-ipc/src/lib.rs
@@ -0,0 +1 @@
+//! JSON-RPC 2.0 over newline-delimited JSON on a Unix socket.
diff --git a/crates/xy-protocol/Cargo.toml b/crates/xy-protocol/Cargo.toml
new file mode 100644
index 0000000..3540503
--- /dev/null
+++ b/crates/xy-protocol/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "xy-protocol"
+edition.workspace = true
+version.workspace = true
+license.workspace = true
+
+[dependencies]
+serde.workspace = true
+serde_json.workspace = true
+thiserror.workspace = true
+kdl.workspace = true
+humantime.workspace = true
+humantime-serde.workspace = true
+
+[dev-dependencies]
+tempfile.workspace = true
diff --git a/crates/xy-protocol/src/lib.rs b/crates/xy-protocol/src/lib.rs
new file mode 100644
index 0000000..a344f10
--- /dev/null
+++ b/crates/xy-protocol/src/lib.rs
@@ -0,0 +1 @@
+//! Wire types and config schema shared between the xy daemon and CLI.
diff --git a/crates/xy-supervisor/Cargo.toml b/crates/xy-supervisor/Cargo.toml
new file mode 100644
index 0000000..1bd5a5f
--- /dev/null
+++ b/crates/xy-supervisor/Cargo.toml
@@ -0,0 +1,17 @@
+[package]
+name = "xy-supervisor"
+edition.workspace = true
+version.workspace = true
+license.workspace = true
+
+[dependencies]
+xy-protocol.workspace = true
+tokio.workspace = true
+tracing.workspace = true
+thiserror.workspace = true
+nix.workspace = true
+async-trait.workspace = true
+
+[dev-dependencies]
+tokio-test.workspace = true
+tempfile.workspace = true
diff --git a/crates/xy-supervisor/src/lib.rs b/crates/xy-supervisor/src/lib.rs
new file mode 100644
index 0000000..1747681
--- /dev/null
+++ b/crates/xy-supervisor/src/lib.rs
@@ -0,0 +1 @@
+//! Process-supervision primitives for the xy daemon.
diff --git a/crates/xy/Cargo.toml b/crates/xy/Cargo.toml
new file mode 100644
index 0000000..bd6609b
--- /dev/null
+++ b/crates/xy/Cargo.toml
@@ -0,0 +1,27 @@
+[package]
+name = "xy"
+edition.workspace = true
+version.workspace = true
+license.workspace = true
+
+[[bin]]
+name = "xy"
+path = "src/main.rs"
+
+[dependencies]
+xy-protocol.workspace = true
+xy-supervisor.workspace = true
+xy-ipc.workspace = true
+tokio.workspace = true
+clap.workspace = true
+serde.workspace = true
+serde_json.workspace = true
+tracing.workspace = true
+tracing-subscriber.workspace = true
+anyhow.workspace = true
+etcetera.workspace = true
+nix.workspace = true
+humantime.workspace = true
+
+[dev-dependencies]
+tempfile.workspace = true
diff --git a/crates/xy/src/main.rs b/crates/xy/src/main.rs
new file mode 100644
index 0000000..662ece1
--- /dev/null
+++ b/crates/xy/src/main.rs
@@ -0,0 +1,3 @@
+fn main() {
+    println!("xy: not implemented yet");
+}
diff --git a/src/main.rs b/src/main.rs
deleted file mode 100644
index e7a11a9..0000000
--- a/src/main.rs
+++ /dev/null
@@ -1,3 +0,0 @@
-fn main() {
-    println!("Hello, world!");
-}