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 KirKruglov/claude-skills-kit --skill feature-announcement-writergit clone --depth 1 https://github.com/KirKruglov/claude-skills-kitWrote 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/kirkruglov/claude-skills-kit/feature-announcement-writer)<a href="https://agentmods.dev/skills/kirkruglov/claude-skills-kit/feature-announcement-writer"><img src="https://agentmods.dev/badge/skills/kirkruglov/claude-skills-kit/feature-announcement-writer/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/kirkruglov/claude-skills-kit/feature-announcement-writer"><img src="https://agentmods.dev/badge/skills/kirkruglov/claude-skills-kit/feature-announcement-writer.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00117 | $0.01598 |
| Opus 5 | $0.00059 | $0.00799 |
| Sonnet 5 | $0.00023 | $0.00320 |
| Haiku 4.5 | $0.00012 | $0.00160 |
Grade A, and why
feature-announcement-writer 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 12d 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.
How it starts
The opening of the file, as written. The whole thing — 158 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Feature Announcement Writer
This skill generates a ready-to-use multi-format announcement pack from a single product feature description. Designed for product managers, product owners, and content marketers who need to distribute a feature announcement across 4 channels (changelog, email, in-app push, social) without manually rewriting the same information for each format.
Input:
- Feature description (plain text, pasted inline or as
.mdfile — min 1 paragraph) - Optional: product name, feature name, target audience (users / customers / internal / developers), launch type (GA / beta / soft launch)
Output:
- Markdown document with 4 labeled, copy-ready sections: Changelog Entry, Email Announcement, In-App Push, Social Post (LinkedIn/X)
Language Detection
Detect the user's language from their message:
- If Russian (or contains Cyrillic): respond in Russian
- If English (or other Latin-script language): respond in English
- If ambiguous: respond in the language of the trigger phrase used
Instructions
Step 1: Accept and Validate Input
-
Check if the user provided a feature description (inline text or file)
- If no description provided: Stop — "Please describe the feature you want to announce. Paste a 1–2 paragraph description and I'll generate the announcement pack."
- If description is a
.docxor.pdffile: Stop — "feature-announcement-writer works with plain text or .md files. Export your document to text format and try again."
-
Check description length
- If fewer than 1 paragraph (less than 3 meaningful sentences): ask one clarifying question — "What's the main benefit for users?" — then continue with available info
-
Check if this is a sprint summary with multiple features
- If input contains 5+ distinct feature bullet points or explicit sprint/release framing: Flag — "This looks like a sprint summary with multiple features. For multi-feature release notes, use
release-notes-generatorinstead."
- If input contains 5+ distinct feature bullet points or explicit sprint/release framing: Flag — "This looks like a sprint summary with multiple features. For multi-feature release notes, use
Step 2: Extract Context
What ships with it
4 files 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.
- 12d ago First seen · 158 lines · 117 tokens per session scan A 822e4454a070
feature-announcement-writer is a skill published in the GitHub repository KirKruglov/claude-skills-kit (18 stars, last pushed 1mo ago), licensed MIT. It adds 117 tokens to every session and 1,598 once invoked, about $0.0006 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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