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 ncaq/konoka --skill mutablegit clone --depth 1 https://github.com/ncaq/konokaWrote 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/ncaq/konoka/mutable)<a href="https://agentmods.dev/skills/ncaq/konoka/mutable"><img src="https://agentmods.dev/badge/skills/ncaq/konoka/mutable/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/ncaq/konoka/mutable"><img src="https://agentmods.dev/badge/skills/ncaq/konoka/mutable.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 | $0.00048 | $0.00329 |
| Opus 5.5 | $0.00019 | $0.00132 |
| Sonnet 5.5 | $0.00010 | $0.00066 |
| Haiku 4.5 | $0.00005 | $0.00033 |
Grade A, and why
mutable 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 1mo 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
mutableな変数
普段はmutableな変数の使用を避ける
一般的なプログラミングにおいても、 mutableな変数はできるだけ避けるべきだとされています。
特にHaskellは純粋関数型言語です。
immutableにレコードを差分更新することを効率よく行えるようになっているので、 mutableな変数が欲しいことは滅多にありません。
mutableな変数を実現する機構は原則禁止です。
例えば以下の機構は避けるべきです。
IORefSTRefST
スレッド間の通信にはSTMのミュータブルな変数を使う
スレッド間の通信を行いたい場合はミュータブルな変数を使った方がスムーズなことがあります。
例えば以下の型が該当します。
TVarTMVarTChanTQueueTBQueue
しかしこれらも低レイヤーな機構なので、 そのまま深く入り組ませずに、 抽象化して使うべきです。
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.
- 1mo ago First seen · 42 lines · 48 tokens per session scan A 43cb5de0b507
mutable is a skill published in the GitHub repository ncaq/konoka (3 stars, last pushed yesterday), licensed Apache-2.0. It adds 48 tokens to every session and 329 once invoked, about $0.0002 per session on Opus 5.5. 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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