skills.by true||false

Library How to run

A product of true||false

Every item lists its source, license and what we changed.

skillengineeringVercellink only

vercel-react-best-practices

React and Next.js performance rules from Vercel: data fetching, bundle size, rendering and re-renders.

Get from source source

looks for

writing or reviewing React/Next.js components
bundle or render performance problems
data-fetching waterfalls

This one isn't copied here because its license is unclear. Read it at the source.

audit trail

source: vercel-labs/agent-skills
author: Vercel
license: MIT (declared in SKILL.md frontmatter only)
pinned: 1a2c79d4e6c4
imported: 2026-11-13
verified: 2026-11-13
changes: None; unmodified upstream files.
privacy scan: pass
scripts: none
in the zip: link only
notes: Repo has no LICENSE file; MIT is declared only in the skill's frontmatter, so link until a license file exists.

works with

Claude, Codex, ChatGPT

more in engineering

skilltrueorfalse
api-contract
Locks request/response shapes and change rules so clients and servers can ship independently without breaking.
- a new or changed endpoint
- a field rename, removal or type change
- plain-text error responses
Claude · Codex · ChatGPT
skilltrueorfalse
audit-trail
Specifies an append-only audit events model and the rules for writing, reading, retaining and exporting it.
- admin actions, role or permission changes
- money, pricing or inventory edits
- sign-in, password, key and token lifecycle events
Claude · Codex · ChatGPT
skilltrueorfalse
debug
Runs a reproduce → isolate → hypothesize → fix → prove loop so fixes address causes, not symptoms.
- an error message or stack trace
- a failing or flaky test
- it worked yesterday
Claude · Codex · ChatGPT