diff --git a/Cargo.lock b/Cargo.lock
index 83f349ba..b234052b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -504,6 +504,16 @@ dependencies = [
  "uuid",
 ]
 
+[[package]]
+name = "cc-types"
+version = "0.1.0"
+dependencies = [
+ "chrono",
+ "serde",
+ "serde_json",
+ "uuid",
+]
+
 [[package]]
 name = "cfg-if"
 version = "1.0.4"
@@ -584,6 +594,7 @@ dependencies = [
  "bytes",
  "cc-keybindings",
  "cc-observability",
+ "cc-types",
  "chrono",
  "clap",
  "crossterm",
diff --git a/Cargo.toml b/Cargo.toml
index 249545fa..e4dd6866 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -122,6 +122,7 @@ parking_lot = "0.12"
 # 内部 crates (workspace split)
 cc-keybindings = { path = "crates/cc-keybindings" }
 cc-observability = { path = "crates/cc-observability" }
+cc-types = { path = "crates/cc-types" }
 
 # Daemon HTTP server
 axum = { version = "0.8", features = ["ws"] }
diff --git a/crates/cc-types/Cargo.toml b/crates/cc-types/Cargo.toml
new file mode 100644
index 00000000..2d2f54b2
--- /dev/null
+++ b/crates/cc-types/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "cc-types"
+version = "0.1.0"
+edition = "2021"
+description = "Pure leaf types for cc-rust: message, state, transitions (no runtime deps on root crate)"
+
+[dependencies]
+serde = { workspace = true }
+serde_json = { workspace = true }
+uuid = { workspace = true }
+chrono = { workspace = true }
diff --git a/crates/cc-types/src/lib.rs b/crates/cc-types/src/lib.rs
new file mode 100644
index 00000000..37f5acf0
--- /dev/null
+++ b/crates/cc-types/src/lib.rs
@@ -0,0 +1,12 @@
+//! Pure leaf types extracted from `claude-code-rs::types`.
+//!
+//! This crate holds the subset of `src/types/` with no cross-module dependencies
+//! on the main crate (teams / ui / config / ipc). The three modules below are
+//! the truly pure leaves; `app_state`, `tool`, and `config` remain in the root
+//! crate because they still reach into the not-yet-extracted subsystems.
+//!
+//! See issue #70 (`[workspace-split] Phase 1`) for the rationale behind this
+//! partial split.
+pub mod message;
+pub mod state;
+pub mod transitions;
diff --git a/crates/claude-code-rs/src/types/message.rs b/crates/cc-types/src/message.rs
similarity index 100%
rename from crates/claude-code-rs/src/types/message.rs
rename to crates/cc-types/src/message.rs
diff --git a/crates/claude-code-rs/src/types/state.rs b/crates/cc-types/src/state.rs
similarity index 100%
rename from crates/claude-code-rs/src/types/state.rs
rename to crates/cc-types/src/state.rs
diff --git a/crates/claude-code-rs/src/types/transitions.rs b/crates/cc-types/src/transitions.rs
similarity index 100%
rename from crates/claude-code-rs/src/types/transitions.rs
rename to crates/cc-types/src/transitions.rs
diff --git a/crates/claude-code-rs/Cargo.toml b/crates/claude-code-rs/Cargo.toml
index 6e02621d..f022887a 100644
--- a/crates/claude-code-rs/Cargo.toml
+++ b/crates/claude-code-rs/Cargo.toml
@@ -134,6 +134,7 @@ parking_lot = { workspace = true }
 # 内部 workspace crates (P1)
 cc-keybindings = { workspace = true }
 cc-observability = { workspace = true }
+cc-types = { workspace = true }
 
 # Daemon
 axum = { workspace = true }
diff --git a/crates/claude-code-rs/src/types/mod.rs b/crates/claude-code-rs/src/types/mod.rs
index 147d1755..203cf538 100644
--- a/crates/claude-code-rs/src/types/mod.rs
+++ b/crates/claude-code-rs/src/types/mod.rs
@@ -1,6 +1,13 @@
+// `message`, `state`, `transitions` now live in the `cc-types` workspace crate
+// (issue #70 — Phase 1 leaf extraction). Re-export them here so existing
+// `crate::types::message::*` paths keep resolving across the ~100 call sites
+// in this crate.
+//
+// `app_state`, `tool`, and `config` still depend on teams / ui / config / ipc
+// and stay local to the root crate until those subsystems move out. Once they
+// do, this file can collapse to a single `pub use cc_types::*;`.
+pub use cc_types::{message, state, transitions};
+
 pub mod app_state;
 pub mod config;
-pub mod message;
-pub mod state;
 pub mod tool;
-pub mod transitions;