Inconsistencies in vercel-composition-patterns and vercel-react-best-practices skills

[jason-ezenwa]

The following inconsistencies/bugs were confirmed by a fresh npx skills add vercel-labs/agent-skills install. All are present in the downloaded files before any local modification.

---

1 — vercel-composition-patterns: broken example code in state-lift-state.md

Files: skills/vercel-composition-patterns/rules/state-lift-state.md (line 114), AGENTS.md (line 681)

The "Correct" example references Composer.Context:

const { actions } = use(Composer.Context)

Composer is a compound component object ({ Provider, Frame, Input, … }) — it has no .Context property. The correct reference, consistent with state-context-interface.md and every other usage in the skill, is:

const { actions } = use(ComposerContext)

---

2 — vercel-composition-patterns: impact level conflict on Component Architecture section

Files: rules/architecture-avoid-boolean-props.md, SKILL.md, rules/_sections.md

Three sources disagree on the impact of the Component Architecture section:

• architecture-avoid-boolean-props.md frontmatter: impact: CRITICAL
• SKILL.md Quick Reference table: HIGH
• rules/_sections.md: HIGH

One of these needs to be the authority — currently an agent reading any two of these files gets conflicting signals.

---

3 — vercel-react-best-practices: stale Quick Reference description for js-batch-dom-css

File: skills/vercel-react-best-practices/SKILL.md (line 110)

Quick Reference says:

js-batch-dom-css - Group CSS changes via classes or cssText

The rule file title is "Avoid Layout Thrashing" with a substantively different scope. The description was not updated when the rule was renamed/revised.

---

4 — vercel-react-best-practices: stale Quick Reference description for advanced-use-latest

File: skills/vercel-react-best-practices/SKILL.md (line 130)

Quick Reference says:

advanced-use-latest - useLatest for stable callback refs

The rule file title is now "useEffectEvent for Stable Callback Refs" and the implementation has changed. Description is stale.

---

5 — vercel-react-best-practices: invalid YAML frontmatter in rerender-memo-with-default-value.md

File: skills/vercel-react-best-practices/rules/rerender-memo-with-default-value.md

The frontmatter block contains leading and trailing blank lines inside the --- delimiters, which breaks strict YAML parsers:

---

title: Extract Default Non-primitive Parameter Value...
impact: MEDIUM
...

---

Every other rule file in both skills uses tightly-packed frontmatter with no interior blank lines.

---