Finance skill builder

Turn a workflow your team already runs (a flux review, a vendor check, a monthly tie-out) into a reusable skill of your own, built to the same standards as the tools in this library.

Install: all-systems-go
Ask: “Turn what we just did into a skill.” or /finance-skill-builder
Works best with: A Finance Brain: this tool reads your definitions first
Time: 10 to 20 minutes per skill

Two ways in

Capture what you just did. Run an analysis with Claude, then say “save what we just did.” The builder generalizes it, so the period and figures become inputs, and re-runs it to confirm it reproduces your result.
Start from scratch. Say “build me a skill for our monthly flux review.” A short interview pins down the trigger, the inputs, the logic, the checks, and the output, then a dry run against a recent period tests it.

The standards it builds in

Every skill it writes follows the same rules as the tools here:

Reads your Finance Brain first, so it never re-derives your accounts or definitions.
Read-only against every connected system.
Computes, never eyeballs. Totals run in a computation step.
Ties out to a control total wherever one exists, and reports the match or the variance.
Confirms the period before it runs, and shows its work.
No secrets in the skill or its output.

Where your skills live

In your own workspace (.claude/skills/ in a project, or ~/.claude/skills/ to use everywhere), never inside the installed plugin. Your skills survive every update.

Try asking

Build me a skill for our monthly flux review.

Install

You'll need Claude Cowork (the Cowork tab in the Claude desktop app, on a Pro, Max, Team, or Enterprise plan). Everything installs from inside Cowork — no command line.

Add the airCFO marketplace (once — skip this if you've installed any airCFO tool before): click Customize in the left sidebar, then Browse plugins → Personal → + → Add marketplace from GitHub, and enter https://github.com/aircfo/claude-startup-finance
Install all-systems-go. Already installed? Click Update on the marketplace instead, so you have the latest version.
Work from your Finance Brain if you have one: open the folder with Work in a folder so the tool reads your definitions. No Finance Brain yet? Download the free starter kit.
Ask: Turn what we just did into a skill.

Missing one of the systems above? The tool still runs. Whatever it couldn't read shows up as an open question, never a guess.