code-contracts SKILL.md skillA
code-contracts from arcanada-one/datarim is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add arcanada-one/datarim/code-contracts@git:20261004.8dfccd1Pins git:20261004.8dfccd1 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- arcanada-one/datarim
- Path
skills/code-contracts/SKILL.md- Versions recorded
- 1
- Latest version
- git:20261004.8dfccd1, committed Oct 4, 2026
- Size
- 17,409 bytes
- Repository stars
- 16
- License
- MIT
Define, use, and enforce @cc code-contracts across a codebase.
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
# Code Contracts
A simple open format for specifying structured assumptions and requirements colocated with code to
support faster and better agent-driven software development.
```typescript
/**
* @cc [owner:spolu,label:product] balance-pre-and-fail
* `from.balance` is expected to be greater than or equal to `invoice.amount`, fails with
* `InsufficientBalanceError` otherwise.
*/
/**
* @cc [owner:spolu,label:product] balance-post
* `from.balance` is decreased by `invoice.amount` and `invoice.status` is set to `paid`.
*/
/**
* @cc [owner:spolu,label:product] atomicity
* The operation is atomic: either `from.balance` is decreased and `invoice.status` is set to
* `paid`, or neither is changed.
*/
export async function payInvoice(
invoice: Invoice,
from: Account,
): Promise<PaidInvoice> {
...
}
```
## Why code contracts?
Code contracts are written and used by both humans and agents to reason about code.
They serve three main purposes:
**Specification**: Compared with separate product or system specification files, which tend to
drift from code and are harder to discover, code contracts are embedded locally. Humans use them to
…Read the whole file at its exact version.
How to install
mdr add arcanada-one/datarim/code-contracts@sha256:01b2f448b12e4044The line at the top of this page pins the label git:20261004.8dfccd1, 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_jcgk6jyna473hijx)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Oct 4, 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 (17409 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
arcanada-one/datarim · 16 stars · license MIT · pushed 2026-10-29 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_jcgk6jyna473hijx GET https://markdownregistry.com/api/v1/resolve?ref=arcanada-one/datarim/code-contracts GET https://markdownregistry.com/api/v1/blob/01b2f448b12e4044dd18b2f408bfe18324a530264d35df28c11a68f984da51ce
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.