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 iroha924/mumei --skill cc-whatsnewgit clone --depth 1 https://github.com/iroha924/mumeiWrote 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/iroha924/mumei/cc-whatsnew)<a href="https://agentmods.dev/skills/iroha924/mumei/cc-whatsnew"><img src="https://agentmods.dev/badge/skills/iroha924/mumei/cc-whatsnew/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/iroha924/mumei/cc-whatsnew"><img src="https://agentmods.dev/badge/skills/iroha924/mumei/cc-whatsnew.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 | $0.00124 | $0.01671 |
| Opus 5 | $0.00062 | $0.00835 |
| Sonnet 5 | $0.00025 | $0.00334 |
| Haiku 4.5 | $0.00012 | $0.00167 |
Grade A, and why
cc-whatsnew 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 11d 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 — 197 lines — stays where its author put it; the contents beside it link to each section on GitHub.
cc-whatsnew
Fetches new Claude Code features from official sources and judges their applicability to mumei in one pass.
Step 1. Determine the scope
Interpret $ARGUMENTS with these rules:
| Input example | Interpretation |
|---|---|
latest or empty |
release notes for the latest version |
v2.1.139 / 2.1.139 |
single version |
v2.1.135..v2.1.140 |
range (both ends inclusive) |
last 5 / last 10 |
cumulative diff of the last N versions |
If $ARGUMENTS is empty, choose the scope via AskUserQuestion. Question and options:
- question:
Which range of the Claude Code changelog should be fetched? - header:
Range - options:
Latest version— release notes for the most recent releaseLast 5 versions— cumulative diffSpecific version— entervX.Y.Zvia OtherSpecify a range— entervA..vBvia Other
For "Specific version" and "Specify a range", use the Other input as-is.
Step 2. Fetch from primary sources
Fetch the original text with WebFetch from one of the following, always. Never report from memory-based guesses or search-result summaries alone:
https://github.com/anthropics/claude-code/releases— release page originalshttps://code.claude.com/docs/en/changelog— official changelog
When a new field or new API appears, additionally fetch for spec confirmation:
https://code.claude.com/docs/en/hookshttps://code.claude.com/docs/en/skillshttps://code.claude.com/docs/en/plugins-referencehttps://code.claude.com/docs/en/commands- the feature's dedicated page (e.g.
agent-view,model-config)
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.
- 11d ago First seen · 197 lines · 124 tokens per session scan A 1489e5ed41d1
cc-whatsnew is a skill published in the GitHub repository iroha924/mumei (2 stars, last pushed 4d ago), licensed MIT. It adds 124 tokens to every session and 1,671 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 2026-08-31.
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