#Tell (universal rule)

Preface node heading:tell-universal-rule:9147

#What this page is

This is generated FPF reference text from the specification preface or supporting sections. It helps interpret FPF; it is not FPF Reference product documentation.

#Methodology

Use it to understand how the specification wants to be read, then return to a route, pattern, or work packet for active work. Cite generated IDs only when the wording changes the task decision.

#Content

A boundary description is evolvable iff its claims are separated across the signature stack and each statement is classified as Law, Admissibility, Deontic duty/commitment/grant, or the boundary's observable-effect/evidence family. An E claim names the exact actual occurrence under its direct owner: dated Work only when A.15.1 grounds it, or A.3/A.3.4 and the exact interaction/causal owner for non-Work change. EntityOfConcern, description, and publication carrier remain separate.

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Last Updated: 2026-07-28 — upstream FPF commit 17edd955 (github.com/ailev/FPF)