architecture-paradigm-functional-core SKILL.md skillA
architecture-paradigm-functional-core from athola/claude-night-market is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add athola/claude-night-market/architecture-paradigm-functional-core@git:20260921.ad5ceb4Pins git:20260921.ad5ceb4 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- athola/claude-night-market
- Path
plugins/archetypes/skills/architecture-paradigm-functional-core/SKILL.md- Versions recorded
- 6
- Latest version
- git:20260921.ad5ceb4, committed Sep 21, 2026
- First version recorded
- May 10, 2026
- Size
- 4,802 bytes
- Repository stars
- 348
- License
- MIT
Applies Functional Core, Imperative Shell to isolate logic from side effects. Use when business logic is entangled with I/O or unit tests are slow and brittle.
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
# The Functional Core, Imperative Shell Paradigm ## When To Use - Separating pure business logic from side effects - Improving testability through immutable domain models ## When NOT To Use - Performance-critical hot paths where immutability overhead matters - Purely imperative codebases with no plans to adopt functional patterns ## When to Employ This Paradigm - When business logic is entangled with I/O operations (e.g., database calls, HTTP requests), making tests brittle and slow. - When significant development time is spent rewriting adapters or dealing with framework churn. - When you require a suite of fast, deterministic unit tests that operate on plain data, complemented by a thin integration testing layer. ## Adoption Steps 1. **Inventory Side Effects**: Create a map of all side effects in the system, such as database writes, external API calls, UI events, and filesystem access. Explicitly assign these responsibilities to the "shell." 2. **Model the Core Logic**: Represent business rules and policies as pure functions. These functions should take domain data as input and return decisions or commands as output, avoiding shared mutable state. …
Read the whole file at its exact version.
How to install
mdr add athola/claude-night-market/architecture-paradigm-functional-core@sha256:ab3cb0155562cfe9The line at the top of this page pins the label git:20260921.ad5ceb4, 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_jtqycbe6pxxtigpi)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 6 versions of this file, between May 10, 2026 and Sep 21, 2026, about one every 27 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260921.ad5ceb4 latest | 2026-09-21 | ad5ceb4 | 4,802 B | A | view · diff |
| git:20260622.63c6c16 | 2026-06-22 | 63c6c16 | 4,983 B | A | view · diff |
| git:20260601.8d67212 | 2026-06-01 | 8d67212 | 4,389 B | A | view · diff |
| git:20260529.62f598e | 2026-05-29 | 62f598e | 4,398 B | A | view · diff |
| git:20260521.6f5c7d9 | 2026-05-21 | 6f5c7d9 | 4,395 B | A | view · diff |
| git:20260510.728eb6e | 2026-05-10 | 728eb6e | 4,335 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 (4802 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
athola/claude-night-market · 348 stars · license MIT · pushed 2026-11-05 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_jtqycbe6pxxtigpi GET https://markdownregistry.com/api/v1/resolve?ref=athola/claude-night-market/architecture-paradigm-functional-core GET https://markdownregistry.com/api/v1/blob/ab3cb0155562cfe95b8fea2d142854629692fbe68be66adc9a14587c3b6082e1
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.