diff --git a/.claude/skills/flux-best-practices/SKILL.md b/.claude/skills/flux-best-practices/SKILL.md
index 414e8cf2..7d725f11 100644
--- a/.claude/skills/flux-best-practices/SKILL.md
+++ b/.claude/skills/flux-best-practices/SKILL.md
@@ -11,6 +11,8 @@ metadata:
 
 Use this skill when generating prompts for any BFL FLUX model to ensure optimal image quality and accurate prompt interpretation.
 
+> **Extended reference:** [`AGENTS.md`](AGENTS.md) in this directory is the long-form upstream FLUX guide (vendored from Black Forest Labs). It is supplementary reference material scoped to this skill only — `SKILL.md` is the loadable entry point and the authority. It does not override or extend the repository-root `AGENTS.md` / `AGENT_GUIDE.md`.
+
 ## When to Use
 
 - Creating prompts for FLUX.2 or FLUX.1 models
diff --git a/.claude/skills/vercel-composition-patterns/SKILL.md b/.claude/skills/vercel-composition-patterns/SKILL.md
index d07025bf..a460ad73 100644
--- a/.claude/skills/vercel-composition-patterns/SKILL.md
+++ b/.claude/skills/vercel-composition-patterns/SKILL.md
@@ -19,6 +19,8 @@ boolean prop proliferation by using compound components, lifting state, and
 composing internals. These patterns make codebases easier for both humans and AI
 agents to work with as they scale.
 
+> **Extended reference:** [`AGENTS.md`](AGENTS.md) in this directory is the long-form upstream guide (vendored from Vercel). It is supplementary reference material scoped to this skill only — `SKILL.md` is the loadable entry point and the authority. It does not override or extend the repository-root `AGENTS.md` / `AGENT_GUIDE.md`.
+
 ## When to Apply
 
 Reference these guidelines when:
diff --git a/.claude/skills/vercel-react-best-practices/SKILL.md b/.claude/skills/vercel-react-best-practices/SKILL.md
index df17a294..c836c90f 100644
--- a/.claude/skills/vercel-react-best-practices/SKILL.md
+++ b/.claude/skills/vercel-react-best-practices/SKILL.md
@@ -11,6 +11,8 @@ metadata:
 
 Comprehensive performance optimization guide for React and Next.js applications, maintained by Vercel. Contains 65 rules across 8 categories, prioritized by impact to guide automated refactoring and code generation.
 
+> **Extended reference:** [`AGENTS.md`](AGENTS.md) in this directory is the long-form upstream guide (vendored from Vercel). It is supplementary reference material scoped to this skill only — `SKILL.md` is the loadable entry point and the authority. It does not override or extend the repository-root `AGENTS.md` / `AGENT_GUIDE.md`.
+
 ## When to Apply
 
 Reference these guidelines when: