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/nweii/agent-stuff/update-changelognpx skills add nweii/agent-stuff --skill update-changeloggit clone --depth 1 https://github.com/nweii/agent-stuffWrote 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/nweii/agent-stuff/update-changelog)<a href="https://agentmods.dev/skills/nweii/agent-stuff/update-changelog"><img src="https://agentmods.dev/badge/skills/nweii/agent-stuff/update-changelog.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 | $0.00056 | $0.00386 |
| Opus 5 | $0.00028 | $0.00193 |
| Sonnet 5 | $0.00011 | $0.00077 |
| Haiku 4.5 | $0.00006 | $0.00039 |
Grade A, and why
update-changelog 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 5d 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
Update Changelog
Update changelog files following Keep a Changelog conventions.
Usage
/update-changelog <version> <change_type> <message>
Parameters
<version>: Version number (e.g., "1.1.0")<change_type>: One of: "added", "changed", "deprecated", "removed", "fixed", "security"<message>: Description of the change
Process
- Check for existing changelog (CHANGELOG.md or changelog.md), create if missing
- Find or create section for the specified version with today's date
- Add the new entry under the appropriate change type heading
- Format according to Keep a Changelog conventions
- Write the updated changelog back to file
Format Conventions
- Group changes by type (Added, Changed, Deprecated, Removed, Fixed, Security)
- List changes as bullet points
- Include date for version sections (YYYY-MM-DD)
- Keep entries concise but descriptive
- No emojis
Example Output
## [1.2.0] - 2025-01-24
### Added
- New markdown to BlockDoc conversion feature
### Fixed
- Bug in HTML renderer causing incorrect output
Plugin changelogs
For plugin changelog formats, see skill-plugin-conventions.md.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 5d ago First seen · 58 lines · 56 tokens per session scan A d936ab94eea8
update-changelog is a skill published in the GitHub repository nweii/agent-stuff (8 stars, last pushed 17d ago), licensed MIT. It adds 56 tokens to every session and 386 once invoked, about $0.0003 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 2026-08-31.
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