What is build-and-validation?

Build and maintenance instructions for a React Native testing library, a JavaScript and TypeScript package used to test mobile interfaces. They document its commands, source layout, and generated documentation workflow.

Running tests, type checks, linting, formatting checks, validation, builds, and documentation generation or synchronization checks.

They make it clear how to install dependencies and verify code, while preventing manually edited documentation from becoming inconsistent with its source.

build-and-validation — Agent by callstack

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add agents/callstack/react-native-testing-library/build-and-validation

Clone the repo

git clone --depth 1 https://github.com/callstack/react-native-testing-library

Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 362 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5	$0.00000	$0.00362
Opus 5	$0.00000	$0.00181
Sonnet 5	$0.00000	$0.00072
Haiku 4.5	$0.00000	$0.00036

Measured 2d ago against content hash b33dd43ba10c, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

build-and-validation scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

agents/build-and-validation.md · 38 lines

What it actually says

Build, Validation, And Repo Layout

Common commands

Install dependencies: yarn install
Run tests: yarn test
Run tests in CI mode: yarn test:ci
Type check: yarn typecheck
Lint source files: yarn lint
Check formatting: yarn format:check
Validate the main package: yarn validate
Build the package: yarn build
Regenerate package docs: yarn docs:generate
Check package docs are in sync: yarn docs:check

Command notes

yarn lint runs ESLint on src.
yarn validate runs typecheck, tests, lint, and oxfmt checks for the main package.
yarn build cleans dist/, transpiles source with Babel, and emits TypeScript declarations.

Documentation

The docs under website/docs/ are the source of truth. The docs/api/*.md files are generated from them — never edit those by hand.
After making any documentation changes, run yarn docs:generate to regenerate the package docs, and commit the regenerated files alongside your website/ edits. yarn docs:check (part of validate:all) fails if they are out of sync.

Repo layout

src/: source code
src/pure.ts: core logic without side effects
src/index.ts: main entry point with auto-cleanup side effects
examples/: example React Native apps
website/: documentation site
codemods/: codemod implementations and tests

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2d ago First seen · 38 lines · 0 tokens per session scan A b33dd43ba10c

Subscribe to this mod's changes

build-and-validation is an agent published in the GitHub repository callstack/react-native-testing-library (3,414 stars, last pushed 19d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 362 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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