diff --git a/CLAUDE.md b/CLAUDE.md
index 32fe7aa..b50be71 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -207,10 +207,16 @@ Every 1 second:
   - Recommended: Slow (60-300s): Disk, Systemd
 - **Independent tasks**: Each collector spawned as separate tokio task in `Agent::new()`
 - **Cache updates**: Collectors acquire write lock → update → release immediately
-- **ZMQ sender**: Main loop reads cache every `collection_interval_seconds` and broadcasts
-- **Notification check**: Runs every `notifications.check_interval_seconds`
-- **Lock strategy**: Short-lived write locks prevent blocking, read locks for transmission
-- **Stale data**: Acceptable for slow-changing metrics (SMART data, disk usage)
+- **ZMQ sender**: Dedicated OS thread with own publisher socket, uses `try_read()` to avoid blocking
+- **Non-blocking reads**: `try_read()` never blocks - sends previous data if cache is locked
+- **Notification check**: Runs every `notifications.check_interval_seconds` in main loop
+- **Lock strategy**: Short-lived write locks, non-blocking reads for transmission
+- **Stale data**: Acceptable for slow-changing metrics AND when collector holds write lock
+
+**Threading Model:**
+- Main thread: tokio runtime for command handling and notifications
+- Collector threads: 7 independent tokio tasks updating shared cache
+- ZMQ sender thread: Dedicated OS thread (ZMQ sockets not thread-safe) with lock-free reads
 
 **Configuration (NixOS):**
 All intervals and timeouts configurable in `services/cm-dashboard.nix`:
@@ -232,9 +238,10 @@ Command Timeouts (prevent resource leaks from hung commands):
 - `collectors.network.command_timeout_seconds` (default: 10s) - ip route, ip addr
 
 **Code Locations:**
-- agent/src/agent.rs:59-133 - Collector task spawning
-- agent/src/agent.rs:151-179 - Independent collector task runner
-- agent/src/agent.rs:199-207 - ZMQ sender in main loop
+- agent/src/agent.rs:69-144 - Collector task spawning with configured intervals
+- agent/src/agent.rs:162-190 - Independent collector task runner
+- agent/src/agent.rs:202-249 - ZMQ sender in dedicated OS thread with try_read()
+- agent/src/agent.rs:251-264 - Main loop (commands and notifications only)
 
 ### Maintenance Mode