What is website-theory-amsterdam CLAUDE.md?

Project-specific instructions for maintaining the Theory of Computing group website in Amsterdam, built with Eleventy and hosted on Netlify. They record naming rules, content structure and the commands used to build it.

Use them when editing author profiles, refreshing the people directory, running the development server, cleaning build output or preparing a deployment.

They prevent contributors from breaking the site's conventions, especially when adding or updating people. They also clarify that a local build is the main available check because the project has no test suite or linter.

How theory-amsterdam/website-theory-amsterdam configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to theory-amsterdam/website-theory-amsterdam. 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/theory-amsterdam/website-theory-amsterdam/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/theory-amsterdam/website-theory-amsterdam

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/instructions/theory-amsterdam/website-theory-amsterdam/claude-md/github.svg)](https://agentmods.dev/instructions/theory-amsterdam/website-theory-amsterdam/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/theory-amsterdam/website-theory-amsterdam/claude-md"><img src="https://agentmods.dev/badge/instructions/theory-amsterdam/website-theory-amsterdam/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/theory-amsterdam/website-theory-amsterdam/claude-md"><img src="https://agentmods.dev/badge/instructions/theory-amsterdam/website-theory-amsterdam/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 2,240 This file is loaded in full into every session.

When invoked 2,240 The same file — it is already loaded in full.

Security scan C 1 finding. 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	$0.02240	$0.02240
Opus 5.5	$0.00896	$0.00896
Sonnet 5.5	$0.00448	$0.00448
Haiku 4.5	$0.00224	$0.00224

Measured 2mo ago against content hash d7b6fc0b4d4f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade C, and why

website-theory-amsterdam CLAUDE.md scanned grade C with 1 finding 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.

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

npm run clean # rm -rf _site (run this before trusting a build; stale output lingers)

CLAUDE.md · 182 lines

How it starts

The opening of the file, as written. The whole thing — 182 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

Website of the Theory of Computing group in Amsterdam (CWI / UvA / VU). Eleventy 3, deployed on Netlify. README.md covers setup and the contributor workflow; this file covers what you'd otherwise get wrong.

Routine two-monthly people refresh: docs/people-refresh.md.
Before committing anything under src/authors/: bash scripts/check-people.sh.

Commands

npm run dev      # eleventy --serve on :8080, live reload
npm run build    # writes _site/
npm run clean    # rm -rf _site  (run this before trusting a build; stale output lingers)

There is no CI, no linter, no test suite. npm run build is the only gate you have locally. Netlify additionally runs netlify-plugin-checklinks on deploy.

One person = one folder

src/authors/<slug>/index.md plus avatar.<ext>. There is no central people file.

Slug = lowercase, ASCII-folded surname, nobiliary particles dropped: wolf (de Wolf), berg (van den Berg), sa (Sá). One exception: tencate keeps the particle in the slug while lastname: Cate drops it.

Umlaut tiebreak: both conventions are live — kohne (Köhne) strips the diaeresis, while schaefer (Schäfer) and reiffenhaeuser (Reiffenhäuser) use the German ä→ae expansion. For a new person, use whichever form they use themselves (their homepage, email address or institutional page); if there's no evidence either way, strip the diaeresis. Don't rename an existing folder to match — the slug is a URL.

src/authors/authors.json applies layout, tags and permalink to every author page — never set those in a person's file.

Frontmatter

Field	What it does
`title`	Display name. Also the sort tiebreak (its first token).
`lastname`	Primary sort key (`eleventy.config.js:44-55`). Particles dropped: `Wolf`, `Berg`, `Cate`. Diacritics kept: `Köhne`.
`role`	Free text under the name on cards.
`organizations`	List of `{name, url}`. Sidebar of the person's own page only.
`user_groups`	Decides which sections the person appears in. See below.
`social`	Icon links. See below.
`interests`	Short lowercase phrases, joined with commas on the card.

Read the full file on GitHub · 182 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 · 182 lines · 2,240 tokens per session scan C d7b6fc0b4d4f

Subscribe to this mod's changes

website-theory-amsterdam CLAUDE.md is an instructions file published in the GitHub repository theory-amsterdam/website-theory-amsterdam (2 stars, last pushed 1mo ago), licensed MIT. It adds 2,240 tokens to every session, about $0.0090 per session on Opus 5.5. A static security scan graded it C with 1 finding (recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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website-theory-amsterdam: Instructions file for Claude Code