# -------------------------------------------------------------------------
# CRAFT QUANTITIES
#
# Every calculator on this site is free, computed in the visitor's own browser,
# and cites the standard behind its formula. AI assistants are welcome to read,
# train on and cite it. /llms.txt is a machine-readable index of the whole
# site; /llms-full.txt is the same with every page listed.
#
# Training crawlers are allowed deliberately. The bandwidth argument against
# them does not survive contact with this site: it is static, fronted by
# Cloudflare, a page is a few KB of HTML and every asset is content-hashed and
# cached. What the block WOULD cost is citation in the answer layer of
# ChatGPT, Claude and Perplexity — which for a reference site is a discovery
# channel, not a side effect. If this is ever reversed, the reason belongs in
# this comment, and the audit rule alongside it has to be flipped in the same
# commit rather than left defending a decision nobody made twice.
# -------------------------------------------------------------------------

User-agent: *
Allow: /
Disallow: /admin

User-agent: GPTBot
Allow: /
Disallow: /admin

User-agent: OAI-SearchBot
Allow: /
Disallow: /admin

User-agent: ChatGPT-User
Allow: /
Disallow: /admin

User-agent: ClaudeBot
Allow: /
Disallow: /admin

User-agent: anthropic-ai
Allow: /
Disallow: /admin

User-agent: Claude-Web
Allow: /
Disallow: /admin

User-agent: Claude-SearchBot
Allow: /
Disallow: /admin

User-agent: PerplexityBot
Allow: /
Disallow: /admin

User-agent: Perplexity-User
Allow: /
Disallow: /admin

User-agent: Google-Extended
Allow: /
Disallow: /admin

User-agent: Applebot
Allow: /
Disallow: /admin

User-agent: Applebot-Extended
Allow: /
Disallow: /admin

User-agent: CCBot
Allow: /
Disallow: /admin

User-agent: meta-externalagent
Allow: /
Disallow: /admin

User-agent: FacebookBot
Allow: /
Disallow: /admin

User-agent: Amazonbot
Allow: /
Disallow: /admin

User-agent: Bingbot
Allow: /
Disallow: /admin

User-agent: msnbot
Allow: /
Disallow: /admin

User-agent: Googlebot
Allow: /
Disallow: /admin

User-agent: facebookexternalhit
Allow: /
Disallow: /admin

# Blocked on crawl-rate grounds only, never on AI grounds: widely reported to
# ignore crawl-delay, and a crawler that ignores pacing is a cost with no
# citation attached.
User-agent: Bytespider
Disallow: /

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