Small instruments for the parts of infrastructure that bite back
In brief
Small browser tools for the operational questions that are easy to get wrong under pressure, from IAM policies to error budgets. Nothing is uploaded: every tool runs in the page.
Twenty-eight browser tools, each answering one question engineers get wrong under pressure: what no-cache actually means, whether a liveness probe will kill a slow-starting pod, which nginx location wins, what an IAM policy really grants. Paste a config, get one answer and the reasoning behind it, and share it as a link.
What it does
- Every tool is a pure function in the tab: no account, no backend, no telemetry, and nothing you paste is sent anywhere
- The whole input travels in the URL fragment, which browsers never send upstream, so a shared link reproduces the answer exactly
- Copy any answer as Markdown for a pull request or an incident doc
A closer look
Select any screenshot to enlarge it.
The toolbox catalogue, opening on the tools for when something is broken at 2am
An IAM policy of three actions, read as two privilege-escalation paths
A 99.9% objective's error budget, its multi-window burn-rate alerts and the Prometheus rules for them
The whitepaper behind it
The problem it measures, the method behind it, and what it deliberately does not do.