api-versioning-patterns

api-versioning-patterns is a skill for Claude Code, Codex from vibeeval/vibecosystem. It costs 22 tokens per session (739 once invoked), scanned A, original, MIT.

A guide to changing an API over time without unexpectedly breaking the programs that use it. An API is a defined way for software systems to communicate.

In plain words
What is it for?
Use it when choosing URL, header, or query-based API versions, detecting incompatible changes, and writing deprecation and migration plans.
Why use it?
It helps teams identify breaking changes, warn users about older versions, and plan migrations to newer versions.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/vibeeval/vibecosystem/api-versioning-patterns
Any agent
npx skills add vibeeval/vibecosystem --skill api-versioning-patterns
Clone the repo
git clone --depth 1 https://github.com/vibeeval/vibecosystem

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for api-versioning-patterns

README.md
[![agentmods](https://agentmods.dev/badge/skills/vibeeval/vibecosystem/api-versioning-patterns.svg)](https://agentmods.dev/skills/vibeeval/vibecosystem/api-versioning-patterns)
Your own site
<a href="https://agentmods.dev/skills/vibeeval/vibecosystem/api-versioning-patterns"><img src="https://agentmods.dev/badge/skills/vibeeval/vibecosystem/api-versioning-patterns.svg" alt="Measured on agentmods" height="20"></a>
Per session 22 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 739 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00022 $0.00739
Opus 5 $0.00011 $0.00369
Sonnet 5 $0.00004 $0.00148
Haiku 4.5 $0.00002 $0.00074

Measured yesterday against content hash e7039ca35baf, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

api-versioning-patterns scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/api-versioning-patterns/SKILL.md · 105 lines

How it starts

The opening of the file, as written. The whole thing — 105 lines — stays where its author put it; the contents beside it link to each section on GitHub.

API Versioning Patterns

Versioning Strategies

Strateji Örnek Pros Cons
URL Path /v1/users Açık, cache-friendly URL kirliliği
Header Accept: application/vnd.api+json;v=2 Clean URL Debug zor
Query Param /users?version=2 Basit Cache sorunlu
Content Negotiation Accept: application/vnd.company.v2+json RESTful Karmaşık

Öneri: URL Path (/v1/) — en yaygın, en anlaşılır.

Breaking Change Detection

// Breaking changes
const breakingChanges = [
  'Required field ekleme',
  'Field silme veya rename',
  'Type değiştirme (string → number)',
  'Enum value silme',
  'Response structure değiştirme',
  'Error code değiştirme',
  'Auth requirement ekleme'
]

// Non-breaking changes
const nonBreaking = [
  'Optional field ekleme',
  'Yeni endpoint ekleme',
  'Enum value ekleme',
  'Response'a optional field ekleme',
  'Performance improvement'
]

Deprecation Lifecycle

Phase 1: ANNOUNCE (3 ay önce)
  → Deprecation header: Sunset: Sat, 01 Jan 2027 00:00:00 GMT
  → API docs'ta uyarı
  → Consumer'lara email

Phase 2: WARN (2 ay önce)
  → Response header: Deprecation: true
  → Log: deprecated endpoint kullanımı
  → Dashboard: kullanım metrikleri

Phase 3: THROTTLE (1 ay önce)
  → Rate limit düşür
  → Warning response body'ye ekle

Phase 4: SUNSET
  → 410 Gone döndür
  → Migration guide link'i ile

Migration Guide Template

# Migration: v1 → v2

## Breaking Changes
1. `GET /v1/users` → `GET /v2/users`
   - Response: `{ data: User[] }` → `{ items: User[], meta: {...} }`
2. `POST /v1/orders`
   - New required field: `currency` (ISO 4217)

## Step-by-Step
1. Update client SDK to v2
2. Add `currency` field to order creation
3. Update response parsing for `items` + `meta`
4. Test against v2 staging
5. Switch production to v2

## Compatibility Period
v1 available until: 2027-06-01

Checklist

  • Versioning stratejisi seçilmiş
  • Breaking change policy documented
  • Deprecation lifecycle tanımlı
  • Sunset header ekleniyor
  • Migration guide var
  • Version usage metrikleri tracked
  • Consumer notification sistemi var
  • Minimum 6 ay backward compatibility

Read the full file on GitHub · 105 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 105 lines · 22 tokens per session scan A e7039ca35baf

Subscribe to this mod's changes

api-versioning-patterns is a skill published in the GitHub repository vibeeval/vibecosystem (530 stars, last pushed 27d ago), licensed MIT. It adds 22 tokens to every session and 739 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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