Nick Bair
Co-founder · Engineering
Nick is a Co-Founder and the Technical Lead at Sandcastle Labs, where he builds Collimer, the engine the company does its work on. He has spent his career on the engineering side of customer-facing software: as a Customer Engineer at Stainless, as a Senior Lead Technical Account Manager and Senior Staff Implementation Engineer at Nylas, and at Cloud Elements, where he moved from delivery management into implementation engineering and went on to run onboarding services.
Guides by Nick
Check your own AI visibility from Claude or Cursor: the MCP workflow
You can run an AI-visibility scan on any domain from inside Claude Code, Claude Desktop, Cursor, Windsurf, or VS Code. Collimer ships an MCP server with exactly one tool, installed with a five-line config block. Below: the setup, three prompts that work verbatim, and an unedited transcript of a real session, including our own unflattering score.
GPTBot, ClaudeBot, PerplexityBot: which AI crawlers to allow, and what each one does
Every major AI vendor runs separate bots for training, for its search index, and for live user-triggered fetches. Blocking the wrong one makes you invisible in AI answers without actually opting out of anything. A verified, bot-by-bot reference, as of August 2026.
How to tell whether a GEO fix actually worked
A single re-check cannot distinguish a real visibility change from run-to-run noise. The honest method: freeze the prompt panel, re-probe with a confidence interval, and report one of five outcomes, including the null.