principle-boundary-discipline from theonlyfusioncube/potetos-for-everyone is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
Validate and normalize at boundaries, trust internal invariants, and keep business logic free of adapter noise. Use when at parsing, framework, process, network, storage, or user-input boundaries.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Boundary Discipline
## Trigger
At parsing, framework, process, network, storage, or user-input boundaries.
## Rule
Validate and normalize at boundaries, trust internal invariants, and keep business logic free of adapter noise.
## Application
1. Name the concrete decision this principle changes.
2. Apply the rule to that decision, not as a decorative citation.
3. Prefer evidence from the current repository/runtime over generic preference.
4. If the principle conflicts with an explicit user constraint, keep the constraint and state the tradeoff.
The line at the top of this page pins the label git:20260908.ec65ed5, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
GET https://markdownregistry.com/api/v1/artifacts/art_bh6pshgzgahglz5y
GET https://markdownregistry.com/api/v1/resolve?ref=theonlyfusioncube/potetos-for-everyone/principle-boundary-discipline
GET https://markdownregistry.com/api/v1/blob/899288548a9a9a655db3be849d1f921cffb3332df6ccdcca3d5eadefcfbb8032
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
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