# AI SIGMA -- robots.txt
# Policy: open to traditional search engines AND AI/LLM crawlers.
# AI SIGMA's mission is to be cited and surfaced. Maximum discoverability is
# the deliberate posture of this site.

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

# --- AI / LLM crawlers (explicitly welcomed) ---

# OpenAI
User-agent: GPTBot
Allow: /

User-agent: OAI-SearchBot
Allow: /

User-agent: ChatGPT-User
Allow: /

# Anthropic
User-agent: ClaudeBot
Allow: /

User-agent: Claude-Web
Allow: /

User-agent: anthropic-ai
Allow: /

# Google
User-agent: Google-Extended
Allow: /

User-agent: GoogleOther
Allow: /

# Perplexity
User-agent: PerplexityBot
Allow: /

User-agent: Perplexity-User
Allow: /

# Meta / Apple / Amazon / Bytedance / Cohere / Common Crawl
User-agent: Meta-ExternalAgent
Allow: /

User-agent: FacebookBot
Allow: /

User-agent: Applebot
Allow: /

User-agent: Applebot-Extended
Allow: /

User-agent: Amazonbot
Allow: /

User-agent: Bytespider
Allow: /

User-agent: cohere-ai
Allow: /

User-agent: CCBot
Allow: /

# You.com / DuckAssist / Mistral / DeepSeek / Diffbot
User-agent: YouBot
Allow: /

User-agent: DuckAssistBot
Allow: /

User-agent: MistralAI-User
Allow: /

User-agent: DeepSeekBot
Allow: /

User-agent: Diffbot
Allow: /

# --- Social link previewers (NOT AI crawlers -- these unfurl OG cards) ---
# These are explicitly listed because some platforms (notably Facebook) do
# strict allowlist matching when explicit user-agent blocks exist elsewhere
# in robots.txt, even though the spec says wildcard `*` should cover them.

User-agent: facebookexternalhit
Allow: /

User-agent: Facebot
Allow: /

User-agent: Twitterbot
Allow: /

User-agent: LinkedInBot
Allow: /

User-agent: Slackbot
Allow: /

User-agent: Slackbot-LinkExpanding
Allow: /

User-agent: Discordbot
Allow: /

User-agent: WhatsApp
Allow: /

User-agent: TelegramBot
Allow: /

User-agent: redditbot
Allow: /

User-agent: Pinterest
Allow: /

# --- Discovery files ---

Sitemap: https://aisigma.org/sitemap-index.xml

# llms.txt + companions (LLM-oriented context, not XML sitemaps):
# https://aisigma.org/llms.txt
# https://aisigma.org/llms-full.txt
# https://aisigma.org/llms-leadership.txt
# https://aisigma.org/llms-research.txt
# https://aisigma.org/llms-press.txt