The free library, no signup wall
Everything free, in one place
Checklists you can print, guides you can send to a colleague, and a cheat sheet for the weaknesses that actually turn up. No signup wall on any of it, and nothing here expires.
Calculators
All of them, grouped by the job. Live results, honest defaults, every assumption where you can see and move it.
AI agent cost calculator
Turn a per-run price into the number that appears on your card. Set your volume, the measured cost per attempt and your real success rate, and see the bill including the retries nobody budgets for.
OpenBuild vs buy calculator
Compare building an agent in-house against buying a verified one, over the horizon you actually plan to. Includes upkeep, which is the line every build case leaves out and the line that decides the answer.
OpenAgent permission blast radius
Tick the scopes you are about to grant and see what a single successful prompt injection reaches. Scores the combinations as well as the parts, because permissions are reviewed one at a time and damage never is.
OpenEmail courses
One short email a day, and one thing to go and do at the end of each.
Print & keep
One-pagers built to live outside the browser: checklists that protect you at the moment of decision, and cheat sheets that translate the jargon.
Checklists
Before you install an MCP server
Twelve things to check before granting an MCP server access to anything, in the order that catches the most problems soonest.
OpenIs your listing ready to submit?
Ten things to fix before you submit a listing for verification, ordered by how often each one causes a first submission to fail.
OpenThe first hour after an agent does something wrong
Ten steps in the order that limits the damage, written to be followed by whoever happens to be there rather than by whoever built it.
OpenCheat sheets
Short guides
Ten-minute reads that give you the whole picture and name the traps. For the deeper, interactive lessons, see the Learn section.
The slop problem, and why curation is the product
Supply that costs almost nothing to produce breaks the assumption every marketplace was built on. What that does to discovery, and what actually works against it.
OpenWhat buyers actually ask before they pay
The questions that come up again and again in pre-purchase messages, and how to answer them on the listing page so they never have to be asked.
OpenHow to read a security finding without panicking or ignoring it
Severity tells you how bad it could be. Reachability tells you whether it can happen to you. Almost every bad decision here comes from reading one and not the other.
OpenWant the interactive versions with charts you can drag? The Learn library teaches the same ideas by letting you break them.