function-result

function-result is a skill for Claude Code from ncaq/konoka. It costs 51 tokens per session (347 once invoked), scanned A, original, Apache-2.0.

A Haskell function-result guideline. It says a function should normally return its final value instead of replacing it with an empty result such as `()`.

In plain words
What is it for?
Use it when writing or reviewing Haskell functions that end with `return ()`, `pure ()`, or `void`. Adjust the function’s type when the final value is useful, leaving callers to discard it when necessary.
Why use it?
Keeping the value available avoids throwing away information and can prevent larger changes if callers need that result later.

Skill for Claude Code

Written for Claude Code: user-invocable in frontmatter.

Part of the haskell-tasuke plugin — 19 skills shipped together

Good fit Use it when writing or reviewing Haskell functions that end with return (), pure (), or void. Adjust the function’s type when the final value is useful, leaving callers to discard it when necessary.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/ncaq/konoka/function-result
View source ↗ ncaq/konoka
Install

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.

Any agent
npx skills add ncaq/konoka --skill function-result
Clone the repo
git clone --depth 1 https://github.com/ncaq/konoka

Made for: Claude Code.

Or install haskell-tasuke, the plugin that ships this one along with the rest of its 19 skills.

Wrote 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.

agentmods badge for function-result

README.md
[![agentmods](https://agentmods.dev/badge/skills/ncaq/konoka/function-result/github.svg)](https://agentmods.dev/skills/ncaq/konoka/function-result)
Your own site
<a href="https://agentmods.dev/skills/ncaq/konoka/function-result"><img src="https://agentmods.dev/badge/skills/ncaq/konoka/function-result/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.

agentmods 80×15 button for function-result

Your own site · 80×15
<a href="https://agentmods.dev/skills/ncaq/konoka/function-result"><img src="https://agentmods.dev/badge/skills/ncaq/konoka/function-result.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 51 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 347 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00051 $0.00347
Opus 5.5 $0.00020 $0.00139
Sonnet 5.5 $0.00010 $0.00069
Haiku 4.5 $0.00005 $0.00035

Measured 1mo ago against content hash 6642491dbc07, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

function-result 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.

plugins/haskell-tasuke/skills/function-result/SKILL.md · 33 lines

What it actually says

関数の最後の値は捨てない

関数の最後で、

  • return ()
  • pure ()
  • void

などを使って値を捨てないでください。

特に理由がないならば関数が値を返すように型の方を合わせてください。

その時その関数の返り値が別に必要ない場合でも、 呼び出し側で捨てれば多くは問題ない話です。 呼び出し側で捨てる手間は非常に少ないです。

必要になった場合に使える余地を残しておいたほうが後々必要になった時に大きく書き換えなくて済みます。

関数の最後がwriteFileのような、 MonadIO m => m ()のようにユニットを返す関数であれば、 自然とそのまま返り値をMonadIO m => m ()にして問題ありません。

ちょっとした補助関数を最後に呼び出して、 それの返り値を返してしまうと、 関数全体の挙動が誤解されてしまうような場合のみ、 最後の値を捨てることを検討してください。

Changes

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.

  1. 1mo ago First seen · 33 lines · 51 tokens per session scan A 6642491dbc07

Subscribe to this mod's changes

function-result is a skill published in the GitHub repository ncaq/konoka (3 stars, last pushed yesterday), licensed Apache-2.0. It adds 51 tokens to every session and 347 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.