fp-pure-functions SKILL.md skillA
fp-pure-functions from pantheon-org/tekhne is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add pantheon-org/tekhne/fp-pure-functions@git:20260710.48d97baPins git:20260710.48d97ba in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- pantheon-org/tekhne
- Path
skills/software-engineering/fp-pure-functions/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260710.48d97ba, committed Jul 10, 2026
- Size
- 12,709 bytes
- Repository stars
- 10
- License
- MIT
Write pure functions and avoid side effects for predictable, testable code.
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
# Pure Functions and Side Effect Management
Pure functions are the foundation of functional programming. A pure function is a function where the return value is determined only by its input values, without observable side effects. This predictability makes code easier to test, reason about, and parallelize.
## Core Characteristics of Pure Functions
A pure function must satisfy two key properties:
1. **Deterministic**: Given the same inputs, it always returns the same output
2. **No Side Effects**: It doesn't modify external state or interact with the outside world
### Example: Pure vs Impure Functions (JavaScript)
```javascript
// IMPURE: Depends on external state
let discount = 0.1;
function calculatePrice(price) {
return price - (price * discount);
}
// PURE: All inputs are parameters
function calculatePriceWithDiscount(price, discount) {
return price - (price * discount);
}
// IMPURE: Modifies external state
let total = 0;
function addToTotal(amount) {
total += amount;
return total;
}
// PURE: Returns new value without mutation
function add(a, b) {
return a + b;
}
// Usage of pure function
const currentTotal = 100;
…Read the whole file at its exact version.
How to install
mdr add pantheon-org/tekhne/fp-pure-functions@sha256:bdacf225265b9ce6The line at the top of this page pins the label git:20260710.48d97ba, 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_fm2p3njltbi6l2ur)
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Versions
The registry has recorded 1 version of this file, committed on Jul 10, 2026.
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 (12709 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
pantheon-org/tekhne · 10 stars · license MIT · pushed 2026-10-21 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_fm2p3njltbi6l2ur GET https://markdownregistry.com/api/v1/resolve?ref=pantheon-org/tekhne/fp-pure-functions GET https://markdownregistry.com/api/v1/blob/bdacf225265b9ce666fe01c28caba7bb9a70f4cd671641e2b5f4c39dd9dc688c
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.