Author CEL expressions used across ObjectStack — formula fields, field conditional rules (visibleWhen, readonlyWhen, requiredWhen), validation / sharing / visibility predicates, flow conditions, and dynamic seed values. Use when the user is writing an F, P, or cel tagged-template literal, or asks "how do I express X as a formula / predicate". Do not use for SQL fragments (driver-native), cron schedules (cron dialect), or L2 hook bodies (those belong in objectstack-data).
How to install objectstack-formula?
objectstack-ai/objectstack/objectstack-formula
$npx -y skills add objectstack-ai/objectstack --skill objectstack-formulaInstalls into the current project.
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Run `npx skills use "https://github.com/objectstack-ai/objectstack" --skill "objectstack-ai/objectstack/objectstack-formula"` and follow the generated skill instructions now. Read its complete output, redirecting it to a temporary file first if necessary. Resolve relative paths from the supporting-files directory it provides.
Use the skills in "https://github.com/objectstack-ai/objectstack" that are relevant to the current task. Run `npx skills add "https://github.com/objectstack-ai/objectstack"` and select the relevant skills, then follow their instructions.
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