diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..0a5cfcf
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,27 @@
+[workspace]
+resolver = "2"
+members = [
+    "crates/spacesh-proto",
+    "crates/spacesh-pty",
+    "crates/spacesh-core",
+    "crates/spaceshd",
+]
+
+[workspace.package]
+edition = "2021"
+version = "0.1.0"
+
+[workspace.dependencies]
+tokio = { version = "1", features = ["full"] }
+tokio-util = { version = "0.7", features = ["codec"] }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+bytes = "1"
+base64 = "0.22"
+anyhow = "1"
+thiserror = "1"
+futures = "0.3"
+portable-pty = "0.8"
+alacritty_terminal = "0.25"
+fs2 = "0.4"
+dirs = "5"
diff --git a/crates/spacesh-core/Cargo.toml b/crates/spacesh-core/Cargo.toml
new file mode 100644
index 0000000..01718ba
--- /dev/null
+++ b/crates/spacesh-core/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "spacesh-core"
+edition.workspace = true
+version.workspace = true
+
+[dependencies]
+alacritty_terminal.workspace = true
+serde.workspace = true
diff --git a/crates/spacesh-core/src/lib.rs b/crates/spacesh-core/src/lib.rs
new file mode 100644
index 0000000..1b486d8
--- /dev/null
+++ b/crates/spacesh-core/src/lib.rs
@@ -0,0 +1 @@
+// modules added in Tasks 11-12
diff --git a/crates/spacesh-proto/Cargo.toml b/crates/spacesh-proto/Cargo.toml
new file mode 100644
index 0000000..4fdb8d7
--- /dev/null
+++ b/crates/spacesh-proto/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "spacesh-proto"
+edition.workspace = true
+version.workspace = true
+
+[dependencies]
+serde.workspace = true
+serde_json.workspace = true
+bytes.workspace = true
+thiserror.workspace = true
+tokio = { workspace = true }
+tokio-util.workspace = true
diff --git a/crates/spacesh-proto/src/codec.rs b/crates/spacesh-proto/src/codec.rs
new file mode 100644
index 0000000..0ca532e
--- /dev/null
+++ b/crates/spacesh-proto/src/codec.rs
@@ -0,0 +1 @@
+// populated in Task 2
diff --git a/crates/spacesh-proto/src/ids.rs b/crates/spacesh-proto/src/ids.rs
new file mode 100644
index 0000000..8bf8d9b
--- /dev/null
+++ b/crates/spacesh-proto/src/ids.rs
@@ -0,0 +1 @@
+// populated in Task 1
diff --git a/crates/spacesh-proto/src/lib.rs b/crates/spacesh-proto/src/lib.rs
new file mode 100644
index 0000000..385b773
--- /dev/null
+++ b/crates/spacesh-proto/src/lib.rs
@@ -0,0 +1,7 @@
+pub mod codec;
+pub mod ids;
+pub mod message;
+
+// re-exports added in Task 1 when types are defined
+// pub use ids::{SurfaceId, WorkspaceId};
+// pub use message::{Cmd, Envelope, ErrorBody, Evt};
diff --git a/crates/spacesh-proto/src/message.rs b/crates/spacesh-proto/src/message.rs
new file mode 100644
index 0000000..8bf8d9b
--- /dev/null
+++ b/crates/spacesh-proto/src/message.rs
@@ -0,0 +1 @@
+// populated in Task 1
diff --git a/crates/spacesh-pty/Cargo.toml b/crates/spacesh-pty/Cargo.toml
new file mode 100644
index 0000000..b42733a
--- /dev/null
+++ b/crates/spacesh-pty/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "spacesh-pty"
+edition.workspace = true
+version.workspace = true
+
+[dependencies]
+portable-pty.workspace = true
+tokio.workspace = true
+bytes.workspace = true
+anyhow.workspace = true
diff --git a/crates/spacesh-pty/src/lib.rs b/crates/spacesh-pty/src/lib.rs
new file mode 100644
index 0000000..9736bfa
--- /dev/null
+++ b/crates/spacesh-pty/src/lib.rs
@@ -0,0 +1 @@
+// PtyHandle implemented in Task 3.
diff --git a/crates/spaceshd/Cargo.toml b/crates/spaceshd/Cargo.toml
new file mode 100644
index 0000000..b156157
--- /dev/null
+++ b/crates/spaceshd/Cargo.toml
@@ -0,0 +1,24 @@
+[package]
+name = "spaceshd"
+edition.workspace = true
+version.workspace = true
+
+[[bin]]
+name = "spaceshd"
+path = "src/main.rs"
+
+[dependencies]
+spacesh-proto = { path = "../spacesh-proto" }
+spacesh-pty = { path = "../spacesh-pty" }
+spacesh-core = { path = "../spacesh-core" }
+tokio.workspace = true
+tokio-util.workspace = true
+serde.workspace = true
+serde_json.workspace = true
+bytes.workspace = true
+base64.workspace = true
+anyhow.workspace = true
+thiserror.workspace = true
+futures.workspace = true
+fs2.workspace = true
+dirs.workspace = true
diff --git a/crates/spaceshd/src/main.rs b/crates/spaceshd/src/main.rs
new file mode 100644
index 0000000..83ba4c1
--- /dev/null
+++ b/crates/spaceshd/src/main.rs
@@ -0,0 +1,3 @@
+fn main() {
+    println!("spaceshd skeleton");
+}