diff --git a/scripts/validate-skills.rb b/scripts/validate-skills.rb
index 1c73223..83acd31 100755
--- a/scripts/validate-skills.rb
+++ b/scripts/validate-skills.rb
@@ -77,6 +77,7 @@ skills.each do |skill|
   if data.key?("metadata") && (!data["metadata"].is_a?(Hash) || !data["metadata"].all? { |key, value| key.is_a?(String) && value.is_a?(String) })
     errors << "#{relative}: metadata must map strings to strings"
   end
+  errors << "#{relative}: metadata.hermes is client-specific and not allowed" if data.dig("metadata", "hermes")
   errors << "#{relative}: must stay under 500 lines" unless text.lines.length < 500
 
   root = File.dirname(skill)
diff --git a/spec-driven-development/SKILL.md b/spec-driven-development/SKILL.md
index 0b8d3ba..076467b 100644
--- a/spec-driven-development/SKILL.md
+++ b/spec-driven-development/SKILL.md
@@ -11,9 +11,6 @@ compatibility: Tool-agnostic — methodology applies to any AI coding agent. Tem
 metadata:
   source: https://github.com/magnus919/agent-skills/spec-driven-development
   spec-version: 1.2.0
-  hermes: tags=["sdd", "specifications", "ai-code-generation", "software-factory",
-    "bdd", "gherkin", "quality-gates", "phase-gates"], related_skills=["sdd-authoring",
-    "sdd-review", "sdd-verification", "sdd-work-decomposition"]
 ---
 
 # Spec-Driven Development for AI Software Factories