Expressions (CEL) — ObjectStack Formula Protocol

ObjectStack has one expression language across every domain that needs computation or boolean predicates: CEL (Google Common Expression Language). This skill is the canonical reference for AI authors emitting formula / condition / predicate / dynamic-seed metadata.

Predicates / formulas are bare CEL — never wrap field references in {…} braces. The #1 authoring mistake is a condition like {record.rating} >= 4: in CEL, {…} is a map literal, so it is a parse error. Write bare CEL: record.rating >= 4. Braces are only for {{ … }} text templates (see Cron and template surfaces).

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