diff --git a/gtd.org b/gtd.org
index f2aee17..def4a11 100644
--- a/gtd.org
+++ b/gtd.org
@@ -63,6 +63,7 @@ Slim down the org-agent microkernel by moving non-essential cognitive functions
 *** TODO Extract Sparse Tree Context Pruning Strategies to a Skill (context.lisp)
 *** TODO Decouple Transport from Protocol (True Actuator-Agnosticism in protocol.lisp)
 *** TODO Implement OACP Schema Validation (Prevent reader macro injection in protocol.lisp)
+*** TODO Implement Pluggable OACP Integrity Hashing (Core interface, Skill-based algorithms)
 *** TODO Implement OACP Backpressure Handling (Queue bounds and BUSY frames in protocol.lisp)
 *** TODO Implement Cognitive Loop "Rut" Recovery (Dynamic Escalation in org-skill-safety-harness)
 *** TODO Implement Asynchronous Event Bus for Telemetry (core.lisp)