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.
npx agentmods add skills/secondsky/claude-skills/api-versioning-strategynpx skills add secondsky/claude-skills --skill api-versioning-strategygit clone --depth 1 https://github.com/secondsky/claude-skillsWrote 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.
[](https://agentmods.dev/skills/secondsky/claude-skills/api-versioning-strategy)<a href="https://agentmods.dev/skills/secondsky/claude-skills/api-versioning-strategy"><img src="https://agentmods.dev/badge/skills/secondsky/claude-skills/api-versioning-strategy.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00044 | $0.00532 |
| Opus 5 | $0.00022 | $0.00266 |
| Sonnet 5 | $0.00009 | $0.00106 |
| Haiku 4.5 | $0.00004 | $0.00053 |
Grade A, and why
api-versioning-strategy 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 6d ago.
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.
What it actually says
API Versioning Strategy
Choose and implement API versioning approaches with proper deprecation timelines.
Versioning Methods
| Method | Example | Pros | Cons |
|---|---|---|---|
| URL Path | /api/v1/users |
Clear, cache-friendly | URL clutter |
| Header | API-Version: 1 |
Clean URLs | Hidden, harder to test |
| Query | ?version=1 |
Easy to use | Not RESTful |
URL Path Versioning (Recommended)
const v1Router = require('./routes/v1');
const v2Router = require('./routes/v2');
app.use('/api/v1', v1Router);
app.use('/api/v2', v2Router);
Version Adapter Pattern
// Transform between versions
const v1ToV2 = (v1Response) => ({
data: {
type: 'user',
id: v1Response.user_id,
attributes: {
name: v1Response.user_name,
email: v1Response.email
}
}
});
Deprecation Headers
app.use('/api/v1', (req, res, next) => {
res.setHeader('Deprecation', 'true');
res.setHeader('Sunset', 'Sat, 01 Jun 2025 00:00:00 GMT');
res.setHeader('Link', '</api/v2>; rel="successor-version"');
next();
});
Safe vs Breaking Changes
Safe Changes (no version bump):
- Adding optional fields
- Adding new endpoints
- Adding optional parameters
Breaking Changes (requires new version):
- Removing fields
- Changing field types
- Restructuring responses
- Removing endpoints
Deprecation Timeline
| Phase | Duration | Actions |
|---|---|---|
| Deprecated | 3 months | Add headers, docs |
| Sunset Announced | 3 months | Email users |
| Read-Only | 1 month | Disable writes |
| Shutdown | - | Return 410 Gone |
Best Practices
- Support N-1 versions minimum
- Provide 6+ months migration window
- Include migration guides with code examples
- Monitor version usage to inform deprecation
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.
- 6d ago First seen · 84 lines · 44 tokens per session scan A f96ed2bf67e5
api-versioning-strategy is a skill published in the GitHub repository secondsky/claude-skills (214 stars, last pushed 3d ago), licensed MIT. It adds 44 tokens to every session and 532 once invoked, about $0.0002 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 2026-08-30.
Other skills, from other repositories
remember
Record why something is the way it is — a decision and its reasoning, a lesson that cost time, or a standing constraint. Use when the reasoning behind a choice would be expensive to reconstruct later.
milestone
Record a change that reshaped the repository — what moved, why it was worth doing, and which areas it touched. Use after a migration, a rewrite, or a decision that changed how part of the system works.
resume
Write down where this stretch of work stopped, so the next session continues instead of restarting. Use at the end of a working session, or when handing the repository to someone else.
bootstrap
Set up chamnan in this repository for the first time — build the architecture index, measure how well the code describes itself, fill in missing file comments, and record a baseline. Run once per repo.
capture
Write down a procedure worth keeping — a multi-step process, a trap that cost real time, or something that has now come up three times. Use it the moment you finish such a task, while the details are still exact.
promote
Turn a scratch script into a permanent tool this repo keeps. Use when a check, report, or analysis has proved worth running more than once.