diff --git a/libs/kaptan-runtime/src/lib.rs b/libs/kaptan-runtime/src/lib.rs
new file mode 100644
index 0000000..cc6d161
--- /dev/null
+++ b/libs/kaptan-runtime/src/lib.rs
@@ -0,0 +1,18 @@
+//! RTIC- and PAC-independent flight services.
+//!
+//! Acquisition and telemetry have separate owners. Boards connect hardware
+//! interrupts to their dedicated workers through bounded deferred events; they
+//! must not place both services behind one priority-ceiling resource.
+
+#![no_std]
+
+/// Single-owner IMU acquisition service.
+pub mod imu;
+/// Lock-free worker handoff primitives.
+pub mod mailbox;
+/// Single-owner MAVLink and UART transmit service.
+pub mod telemetry;
+
+pub use imu::{ImuEvent, ImuService};
+pub use mailbox::LatestImuMailbox;
+pub use telemetry::{TelemetryFault, TelemetryService};