# Allow all search engines to crawl the site
User-agent: *
Allow: /

# Block URL parameters that shouldn't be indexed
Disallow: /*?q=
Disallow: /*?ref=
Disallow: /*?plugin=

# Block phantom .md crawl paths. Plugin READMEs render file-tree diagrams
# listing commands/agents/skills as *.md; crawlers resolve those path strings
# as relative URLs and crawl phantom /plugin/.../*.md (all 404). Scoped to the
# phantom locations ONLY: /posts/*.md must stay fetchable because the blog
# pages load it as a rendering subresource, and a blanket /*.md$ block made
# Googlebot's rendered snapshot of every blog post an error page (learned the
# hard way: indexing requests were rejected). AI crawler groups below override
# '*' and keep full raw-markdown access for GEO.
Disallow: /plugin/*.md$
Disallow: /commands/*.md$
Disallow: /agents/*.md$
Disallow: /skills/*.md$

# Crawl-delay for polite crawling
Crawl-delay: 1

# ---------------------------------------------------------------------------
# AI / LLM crawlers - explicitly allowed (Generative Engine Optimization).
# In robots.txt a named user-agent group overrides the '*' group, so each of
# these AI agents is granted full, unthrottled access. This is intentional: we
# want Sigistry cited in AI answers (ChatGPT, Claude, Perplexity, Gemini).
# ---------------------------------------------------------------------------

# OpenAI (ChatGPT)
User-agent: GPTBot
Allow: /

User-agent: OAI-SearchBot
Allow: /

User-agent: ChatGPT-User
Allow: /

# Anthropic (Claude)
User-agent: ClaudeBot
Allow: /

User-agent: Claude-User
Allow: /

User-agent: Claude-SearchBot
Allow: /

User-agent: anthropic-ai
Allow: /

# Perplexity
User-agent: PerplexityBot
Allow: /

User-agent: Perplexity-User
Allow: /

# Google AI (Gemini / Vertex AI grounding)
User-agent: Google-Extended
Allow: /

# Apple Intelligence
User-agent: Applebot-Extended
Allow: /

# Common Crawl (feeds many open LLMs)
User-agent: CCBot
Allow: /

# Amazon
User-agent: Amazonbot
Allow: /

# Meta AI
User-agent: Meta-ExternalAgent
Allow: /

# DuckDuckGo AI
User-agent: DuckAssistBot
Allow: /

# Cohere
User-agent: cohere-ai
Allow: /

# You.com
User-agent: YouBot
Allow: /

# Orientation file for LLMs and AI agents (llmstxt.org):
# https://sigistry.com/llms.txt  (full catalog: /llms-full.txt)

# Sitemap location
Sitemap: https://sigistry.com/sitemap.xml