CostPilot

What it does

CostPilot is a local CLI that estimates infrastructure cost deltas from Terraform plans before merge. It consumes terraform show - json output and evaluates cost changes entirely offline using deterministic heuristics - no cloud APIs, no IAM roles, no network access. The goal is not billing-exact totals, but fast, reproducible feedback during code review, where infrastructure decisions are still reversible.

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  We launched Infracost on HN five years ago (https://news.ycombinator.com/item?id=26064588) where our CLI generated cost estimates for infra-as-code, e.g. "this Terraform PR adds $400/mo". The idea was to shift cloud costs (FinOps) left, so engineers get visibility of costs before deployment and make better decisions. Earlier this year we started seeing agent traffic in our logs and it looked like coding agents were calling our CLI. But that CLI wasn't designed with coding agents in mind. We went down a philosophical rabbit hole to see if a CLI is even needed anymore given…

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