principle-boundary-discipline SKILL.md skillA
principle-boundary-discipline from michael-denyer/pstack-claude is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add michael-denyer/pstack-claude/principle-boundary-discipline@git:20260923.4a3ef20Pins git:20260923.4a3ef20 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- michael-denyer/pstack-claude
- Path
plugins/pstack/skills/principle-boundary-discipline/SKILL.md- Versions recorded
- 5
- Latest version
- git:20260923.4a3ef20, committed Sep 23, 2026
- First version recorded
- Jun 4, 2026
- Size
- 1,874 bytes
- Repository stars
- 3,776
- License
- MIT
Apply when wiring validation, error handling, or framework adapters. Concentrate guards at system boundaries (CLI, config, network, external APIs); trust internal types and keep business logic in pure functions.
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 Place validation, type narrowing, and error handling at system boundaries. Trust internal code unconditionally. Business logic lives in pure functions. The shell is thin and mechanical. **Why:** Scattered validation is noisy, redundant, and gives a false sense of safety. Keep logic out of framework wiring so it can be tested without the framework. **The pattern:** - **At boundaries** (CLI args, config files, external APIs, network protocols): validate, return errors, handle defensively. - **Inside the system:** typed data, error propagation, no re-validation. Trust the types. - **Across the boundary.** Expose domain concepts, not the boundary's private representation. Keep general-purpose mechanism inside and special-purpose policy at the edge. **Applications:** Validation and error handling: - Validate config at parse time (the boundary), not inside business logic - Parse raw data into domain types at the boundary - Do not re-export transport, storage, framework, or wire types through the public surface - No redundant nil checks deep in call chains if the boundary already validated Code organization: …
Read the whole file at its exact version.
How to install
mdr add michael-denyer/pstack-claude/principle-boundary-discipline@sha256:e59efe04ed66e3a4The line at the top of this page pins the label git:20260923.4a3ef20, 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.
[](https://markdownregistry.com/a/art_vidgyl5r5oaqxr6a)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Jun 4, 2026 and Sep 23, 2026, about one every 28 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260923.4a3ef20 latest | 2026-09-23 | 4a3ef20 | 1,874 B | A | view · diff |
| git:20260907.ebb8c27 | 2026-09-07 | ebb8c27 | 1,874 B | A | view · diff |
| git:20260822.7703e0a | 2026-08-22 | 7703e0a | 1,910 B | A | view · diff |
| git:20260715.5debf23 | 2026-07-15 | 5debf23 | 1,653 B | A | view · diff |
| git:20260604.d869e0a | 2026-06-04 | d869e0a | 1,662 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (1874 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
michael-denyer/pstack-claude · 3,776 stars · license MIT · pushed 2026-11-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_vidgyl5r5oaqxr6a GET https://markdownregistry.com/api/v1/resolve?ref=michael-denyer/pstack-claude/principle-boundary-discipline GET https://markdownregistry.com/api/v1/blob/e59efe04ed66e3a403a50e70640daeb5c7b592598687a67b6e25ceed6251d19f
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.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
More from michael-denyer/pstack-claude
Every file in michael-denyer/pstack-claude