diff --git a/AGENTS.md b/AGENTS.md
index da8fea1..b5b4f95 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -88,6 +88,13 @@ Instant chart and diagram generation for chat and Telegram.
 Relentless, structured interview to stress-test and sharpen plans, architectures, decisions, or ideas before writing code.
 - **Features:** Decision tree & frontier exploration, Telegram/mobile-optimized batching (1-3 questions per round), facts-first environment research, anti-sycophancy challenge, and final specification/ADR synthesis.
 
+### [zwift-workout](skills/zwift-workout/SKILL.md)
+Builds, previews, validates and publishes Zwift `.zwo` workout files (bike-only).
+- **Workflow:** draft JSON spec -> human-readable preview -> user confirms -> publish via hosting -> file into Knowledge Wiki.
+- **Features:** Step types `Warmup`/`Cooldown`/`SteadyState`/`Ramp`/`IntervalsT`/`FreeRide`/`MaxEffort`/`SolidState`; power as FTP fractions; guardrails (0.20-1.50 FTP, XML escaping, round-trip parse check); TSS/duration estimate; templates (`endurance`, `sweetspot`, `vo2max`, `sprint`).
+- **Tools:** CLI at `scripts/zwo.py` (`build`, `from-template`, `validate`, `parse`, `render`, `templates`) + builder at `scripts/zwo_builder.py`.
+- **Integration:** Fitness agent / Tacx Flux 2; synergistic with `garmin-workout` (one spec, two targets).
+
 ### [skill-creator](skills/skill-creator/SKILL.md)
 Guidelines and scripts to help developers build high-quality, token-efficient Claude skills.