Borrowing it
Nothing to install: this file belongs to michaelcolenso/babynames. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/michaelcolenso/babynames/master/CLAUDE.mdgit clone --depth 1 https://github.com/michaelcolenso/babynamesWrote 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.
[](https://agentmods.dev/instructions/michaelcolenso/babynames/claude-md)<a href="https://agentmods.dev/instructions/michaelcolenso/babynames/claude-md"><img src="https://agentmods.dev/badge/instructions/michaelcolenso/babynames/claude-md/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.
<a href="https://agentmods.dev/instructions/michaelcolenso/babynames/claude-md"><img src="https://agentmods.dev/badge/instructions/michaelcolenso/babynames/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.02265 | $0.02265 |
| Opus 5.5 | $0.00906 | $0.00906 |
| Sonnet 5.5 | $0.00453 | $0.00453 |
| Haiku 4.5 | $0.00227 | $0.00227 |
Grade A, and why
babynames CLAUDE.md 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 6d 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.
How it starts
The opening of the file, as written. The whole thing — 97 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
Commands
# Development
npm run dev:web # Pages dev server at :8788 (includes local D1)
npm run dev:ingest # Ingest Worker dev server
# Type checking
npm run typecheck # Type-check all apps + shared package
# Build
npm run build # Compile packages/shared only (apps use wrangler bundling)
# Deploy
npm run deploy:web # Deploy Cloudflare Pages
npm run deploy:ingest # Deploy Ingest Worker
# Database migrations
npm run migrations:apply:local # Apply migrations to local D1
npm run migrations:apply # Apply migrations to remote D1
# Scripts
npm run seed # One-time D1 population from legacy shards (run once pre-deploy)
npm run verify-parity -- --base=<preview-url> # Validate API parity before DNS cutover
npm run backfill-rankings # Populate name_rankings_by_year on remote D1 (idempotent)
npm run backfill-rankings:local # Same against local D1
npm run backfill-viz-payloads # Rebuild viz_payloads on remote D1 (idempotent)
# Test cron trigger
npm run -w @nv/ingest-worker test:scheduled # Test scheduled handler locally
Architecture
Name Vitals — Tracks US baby name popularity using SSA data (1880–present). Monorepo with three deployment units:
| Package | Type | Purpose |
|---|---|---|
apps/web |
Cloudflare Pages | Static assets + Pages Functions (API + SSR) |
apps/ingest-worker |
Cloudflare Worker | Weekly SSA data ingestion via cron + queues |
packages/shared |
npm package | Shared types, classification, D1 queries, renderers |
Shared Package (@nv/shared)
Path alias @nv/shared maps to packages/shared/src/ in all apps. Key exports:
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.
- 6d ago Changed · +1 lines · +300 tokens per session ea926a8f2417
- 1mo ago First seen · 96 lines · 1,965 tokens per session scan A fec6b4aff9d6
babynames CLAUDE.md is an instructions file published in the GitHub repository michaelcolenso/babynames (0 stars, last pushed 2d ago), licensed MIT. It adds 2,265 tokens to every session, about $0.0091 per session on Opus 5.5. A static security scan graded it A with 0 findings. It comes from a forked repository.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
vscode model-prompts.instructions.md
Model-specific prompt authoring and registry guidelines.