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This addon, Cooldown Alert, is a lightweight UI utility designed for both Retail and TBC Anniversary/Classic clients. It addresses the common frustration of "button mashing" a spell that is still on cooldown by providing immediate, high-visibility feedback.

Core Functionality

Failed Cast Detection: Monitors the UNIT_SPELLCAST_FAILED event to trigger only when a player attempts to use an unavailable ability.
Smart Filtering: Uses a custom logic "shim" to filter out the Global Cooldown (GCD), ensuring the alert only appears for actual ability cooldowns longer than 0.5 seconds.
Live Countdown: Unlike static alerts, the text dynamically updates in real-time as the cooldown ticks down, providing precise timing at a glance.
Polished Visuals: Features a smooth fade-out animation and high-contrast outlined text to remain readable during intense combat without cluttering the screen permanently.
Cross-Version Support: Built with a compatibility layer that automatically detects the game client and uses the appropriate APIs for spell, item, and container data.

66:T459,The MIT License Copyright (c) <year> <copyright holders> Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Cooldown Alert (Midnight + TBC Anniversary supported)