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principle-boundary-discipline

Use when wiring input validation, error handling, adapters, CLI or config parsing, or API clients. Check data at the point it enters, rely on typed values past that point, and put domain logic in framework-free functions called by a thin shell.

plugins/requie/endostack/skills/principle-boundary-discipline/SKILL.md

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Nov 6, 2026
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Apache-2.0

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# Boundary discipline

Do the defensive work (parsing, validation, error handling) where data crosses into the system. Past that point, hand typed values around and rely on them. Domain logic belongs in side-effect-free functions that a small layer of framework code invokes.

## When it applies

Wiring validation, error handling, framework adapters, CLI parsing, config loading, or API clients, and deciding where logic lives relative to framework code.

This principle moves checks to the right place. It never justifies skipping validation at a real boundary.

## What to do

1. List the boundaries the change touches: command-line arguments, config files, environment variables, network requests, responses from external APIs, reads from storage, and output from tools or models an agent calls. Each is a trust boundary where content may be malformed or hostile.
2. At each boundary, parse raw input into a domain type, reject what does not parse, and return a typed error. A webhook handler parses the JSON body into a `SignedEvent` after verifying the signature. It does not pass a raw dictionary inward.