An agent for Webpack and related project tooling in a React 18 application. It covers bundling, TypeScript, JavaScript transformation, linting, tests, development-server settings, and continuous-integration pipelines.

Use it to modify Webpack, npm scripts, TypeScript, ESLint, Babel, Jest, Playwright, or CI/CD settings, and to diagnose related failures.

It gives build-focused help when configuration or bundling problems prevent the application from compiling, testing, or shipping.

How DynamoDS/DynamoHome configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to DynamoDS/DynamoHome. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/DynamoDS/DynamoHome/master/.claude/agents/build-agent.md

Clone the repo

git clone --depth 1 https://github.com/DynamoDS/DynamoHome

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/agents/dynamods/dynamohome/build-agent/github.svg)](https://agentmods.dev/agents/dynamods/dynamohome/build-agent)

Your own site

<a href="https://agentmods.dev/agents/dynamods/dynamohome/build-agent"><img src="https://agentmods.dev/badge/agents/dynamods/dynamohome/build-agent/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/agents/dynamods/dynamohome/build-agent"><img src="https://agentmods.dev/badge/agents/dynamods/dynamohome/build-agent.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 35 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 1,127 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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 5.1	$0.00035	$0.01127
Opus 5.5	$0.00014	$0.00451
Sonnet 5.5	$0.00007	$0.00225
Haiku 4.5	$0.00003	$0.00113

Measured 2mo ago against content hash 8feb8d72d46d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

build-agent 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 2mo 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.

.claude/agents/build-agent.md · 101 lines

How it starts

The opening of the file, as written. The whole thing — 101 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a Build & Tooling Engineer for DynamoHome, a React 18 SPA bundled with Webpack 5. Your scope is all build, tooling, and CI/CD configuration.

Build configuration files

webpack.config.ts       # Main bundler config (TypeScript)
tsconfig.json           # TypeScript compiler options
jest.config.ts          # Jest unit test config
playwright.config.js    # Playwright e2e config
.eslintrc               # ESLint rules (extends react-app preset)
.babelrc                # Babel transpilation (babel-loader for JS/JSX files)
package.json            # All npm scripts and dependencies
.github/workflows/      # CI/CD pipelines (build.yml, npm-publish.yml, trigger_l10n_jenkins.yml)

Webpack architecture

Entry: ./src/index.tsx
Output: ./dist/build/index.bundle.js (cleaned on each rebuild)
Loaders:
- .ts/.tsx → ts-loader
- .js/.jsx → babel-loader
- .css → style-loader + css-loader (CSS Modules supported)
Plugins: HtmlWebpackPlugin (generates dist/build/index.html from public/index.html)
Production: TerserPlugin minification, comments stripped, --mode=production flag
Dev server: port 8080, hot reload, opens browser automatically

All npm scripts

npm run start              # webpack-dev-server (development, hot reload, port 8080)
npm run build              # webpack development bundle (unminified, for integration testing)
npm run bundle             # webpack production bundle (minified with TerserPlugin)
npm run production         # bundle + copy package.json, README.md, license_output → dist/
npm run test:unit          # Jest unit tests (NODE_ENV=test)
npm run test:e2e           # Playwright e2e tests
npm run test               # test:unit + test:e2e
npm run lint:check         # ESLint on src/ and tests/ (read-only)
npm run lint:fix           # ESLint auto-fix on src/ and tests/
npm run license:direct     # Pull direct dependency licenses
npm run license:transitive # Pull transitive dependency licenses
npm run license            # license:direct + license:transitive
npm run version:patch      # Bump patch version (no git tag)

Read the full file on GitHub · 101 lines

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.

2mo ago First seen · 101 lines · 35 tokens per session scan A 8feb8d72d46d

Subscribe to this mod's changes

build-agent is an agent published in the GitHub repository DynamoDS/DynamoHome (3 stars, last pushed 11d ago), licensed MIT. It adds 35 tokens to every session and 1,127 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-08-31.

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DynamoHome: Agent for Claude Code