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api-and-interface-design SKILL.md skillA

api-and-interface-design from outlinedriven/outline-driven-development is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add outlinedriven/outline-driven-development/api-and-interface-design@git:20260905.1f63894

Pins git:20260905.1f63894 in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: outlinedriven/outline-driven-development
Path: .devin/skills/api-and-interface-design/SKILL.md
Versions recorded: 2
Latest version: git:20260905.1f63894, committed Sep 5, 2026
First version recorded: Sep 2, 2026
Size: 4,342 bytes
Repository stars: 53
License: Apache-2.0

Use when asked to design or change a public API, route, CLI flag, or module boundary. Not for remote, credential, publish, deploy, or irreversible changes.

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

# API and interface design

## Contract

| Field | Bound contract |
|---|---|
| Trigger | Designing or changing a public API, route, CLI flag, or module boundary. |
| Authority | Reversible local: writes only named local interface definitions and contract docs, edits consumer files onto the new contract, and deletes legacy paths (old signatures, aliases, re-exports, deprecated entry points) during cutover; rollback is undo (discard the uncommitted draft) or version control. No remote mutation. No credential, paid, published, or deployed change, and no VCS history rewrite. |
| Side effect | Interface definitions and contract docs written before implementation; consumer files edited onto the new contract and legacy paths (old signatures, aliases, re-exports, deprecated entry points) deleted during cutover; no build, publish, or remote mutation. |
| Done | Contract is documented with semantics and errors, every consumer is migrated, and no legacy path remains. |

## Inputs
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add outlinedriven/outline-driven-development/api-and-interface-design@sha256:ad6adaf639f0b517

The line at the top of this page pins the label git:20260905.1f63894, 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.

Badge

[![mdr](https://markdownregistry.com/badge/art_xejkysiqnpc37j5p.svg)](https://markdownregistry.com/a/art_xejkysiqnpc37j5p)

4 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 2 versions of this file, between Sep 2, 2026 and Sep 5, 2026, about one every 3 days.

version	committed	commit	size	audit
git:20260905.1f63894 latest	2026-09-05	1f63894	4,342 B	A	view · diff
git:20260902.1fe14a3	2026-09-02	1fe14a3	4,109 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (4342 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

GitHub

outlinedriven/outline-driven-development · 53 stars · license Apache-2.0 · pushed 2026-09-28 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_xejkysiqnpc37j5p
GET https://markdownregistry.com/api/v1/resolve?ref=outlinedriven/outline-driven-development/api-and-interface-design
GET https://markdownregistry.com/api/v1/blob/ad6adaf639f0b51721bc0191dc3730de39b94fbfb1c8a558dee8577d3e670ec1

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.

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