feat(mom): add arrow prefix to tool labels for visual distinction

Closes #65

packages/mom/CHANGELOG.md

@@ -2,6 +2,14 @@
 
 ## [Unreleased]
 
+### Changed
+
+- Reduced tool verbosity in main Slack messages (#65)
+  - During execution: show tool labels (with → prefix), thinking, and text
+  - After completion: replace main message with only final assistant response
+  - Full audit trail preserved in thread (tool details, thinking, text)
+  - Added promise queue to ensure message updates execute in correct order
+
 ## [0.10.0] - 2025-11-27
 
 ### Added

packages/mom/src/agent.ts

@@ -421,7 +421,7 @@ export function createAgentRunner(sandboxConfig: SandboxConfig): AgentRunner {
 						});
 
 						// Show label in main message only
-						queue.enqueue(() => ctx.respond(`_${label}_`));
+						queue.enqueue(() => ctx.respond(`_→ ${label}_`));
 						break;
 					}