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 skills add secondsky/claude-skills --skill api-changelog-versioninggit 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-changelog-versioning)<a href="https://agentmods.dev/skills/secondsky/claude-skills/api-changelog-versioning"><img src="https://agentmods.dev/badge/skills/secondsky/claude-skills/api-changelog-versioning/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/secondsky/claude-skills/api-changelog-versioning"><img src="https://agentmods.dev/badge/skills/secondsky/claude-skills/api-changelog-versioning.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector pass
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 | $0.00042 | $0.00493 |
| Opus 5 | $0.00021 | $0.00246 |
| Sonnet 5 | $0.00008 | $0.00099 |
| Haiku 4.5 | $0.00004 | $0.00049 |
Grade A, and why
api-changelog-versioning 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 9d 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 Changelog & Versioning
Document API changes with clear migration paths and deprecation timelines.
Changelog Structure
# API Changelog
## v3.0.0 (2025-01-15) - Breaking Changes
### Breaking Changes
- Response format now follows JSON:API specification
- Authentication switched from API tokens to JWT Bearer
### Migration Steps
1. Update base URL to `/api/v3`
2. Replace `Authorization: Token xxx` with `Authorization: Bearer xxx`
3. Update response parsing for new envelope format
## v2.5.0 (2024-12-01) - Features
### New Features
- Webhook support for order events
- Batch operations endpoint
- Field filtering via `?fields=` parameter
### Improvements
- 56% faster response times on /products
- Enhanced error messages with field-specific suggestions
Deprecation Schedule
| Version | Status | Support Until |
|---|---|---|
| v3.x | Current | Full support |
| v2.x | Maintenance | 2025-06-01 |
| v1.x | EOL | Unsupported |
Version Support Policy
- Current: Full support, new features
- Maintenance: Bug fixes and security only
- EOL: No support, remove from docs
Migration Guide Template
## Migrating from v2 to v3
### Before (v2)
```json
{ "user_name": "john" }
After (v3)
{ "data": { "type": "user", "attributes": { "name": "john" } } }
Steps
- Update SDK to v3.x
- Modify response handlers
- Test in staging environment
- Update production
## Best Practices
- Provide 3-6 months deprecation notice
- Include before/after code examples
- Mark breaking changes prominently
- Maintain backward compatibility when feasible
- Version via URL path (`/api/v1/`) for clarity
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.
- 9d ago First seen · 82 lines · 42 tokens per session scan A cd9ff0a74c99
api-changelog-versioning is a skill published in the GitHub repository secondsky/claude-skills (216 stars, last pushed 2d ago), licensed MIT. It adds 42 tokens to every session and 493 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.
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bootstrap
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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.
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.
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.