lens SKILL.md skillA

lens from ncaq/konoka is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned
mdr add ncaq/konoka/lens@git:20260521.556d72a

Pins git:20260521.556d72a in mdr.lock. Pin the fingerprint instead.

Audit grade
A, 17 of 17 checks passed
Kind
SKILL.md skill
Repository
ncaq/konoka
Path
plugins/haskell-tasuke/skills/lens/SKILL.md
Versions recorded
1
Latest version
git:20260521.556d72a, committed May 21, 2026
Size
3,223 bytes
Repository stars
3
License
Apache-2.0

Use the lens library, generating accessors with makeFieldsId for NoFieldSelectors records, export accessors together with their type classes, and prefer lens or OverloadedRecordDot over pattern matching. Use when writing or reviewing Haskell code that uses lens, records, or field access.

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

# [lens: Lenses, Folds and Traversals](https://hackage.haskell.org/package/lens)

## `makeFieldsId`

`NoFieldSelectors`を前提に定義したデータ構造に対して、
lensのレコードのフィールドアクセサを定義する時は、
`makeFieldsId`というTemplate Haskell関数を使ってください。

`makeFieldsId`を使うときはフィールドにプレフィクスやアンダースコアは付けないでください。
`NoFieldSelectors`拡張の力でプレフィクスは不要になっています。
`makeFieldsId`関数は完全にフィールド名と同じアクセサを生成するので、
プレフィクスやアンダースコアをつけると奇妙なアクセサが生成されてしまうのでむしろよくありません。

`makeFieldsId`は実行する段階で既に型クラスの定義が見えているならば、
型クラスの重複定義はせず既に存在する型クラスのインスタンスとしてアクセサを定義します。

そのため型クラスの重複を怖がってimportを少なくする必要はありません。
むしろ積極的に既存の型クラスをimportしてください。

循環参照が発生した場合は型クラスの定義だけを別のモジュールに分割して、
双方それをimportしてください。

## `makeFields`

サードパーティのデータ構造や自動生成されたデータ構造に対しては、
プレフィクスやアンダースコアがあるかどうかを考慮して、
`makeFields`などの他のTemplate Haskell関数を使ってください。

## lensで定義されたアクセサは型クラスごとexportする

例えば`makeFieldsId`で`HasUser`型クラスと`user`アクセサを定義した場合、
`user`アクセサをexportするのではなく、
`HasUser`型クラスを内部のアクセサも含めてexportしてください。

## なるべくlensか`OverloadedRecordDot`を使う

パターンマッチを使ってレコードのフィールドにアクセスすると、
どうしてもshadowing警告が発生しやすくなります。
そのためlensか`OverloadedRecordDot`を使ってフィールドにアクセスしてください。

## shadowing警告を回避してレコードを初期化する

データ型のフィールド名と同じ変数を定義すると、
しばしばlensのアクセサによってshadowing警告が発生します。

そのため`NamedFieldPuns`は実質使えないと考えてください。

単にフィールドを設定する場合はlensのSetterを使ってください。
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint
mdr add ncaq/konoka/lens@sha256:081a18826502d8cb

The line at the top of this page pins the label git:20260521.556d72a, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_rcoo4baxsk5v3ch7.svg)](https://markdownregistry.com/a/art_rcoo4baxsk5v3ch7)

2 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 1 version of this file, committed on May 21, 2026.

versioncommittedcommitsizeaudit
git:20260521.556d72a latest2026-05-21 556d72a 3,223 BA view

Audit of the latest version

A  17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (3223 bytes)
  • pass: No zero-width or bidi control characters
  • pass: No instruction hidden inside an HTML comment
  • pass: No link to an exfiltration or paste host
  • pass: No credential-shaped string
  • pass: No instruction to send local credentials anywhere
  • pass: No text hidden with inline styles
  • pass: No prompt-injection phrasing
  • pass: No curl or wget piped into a shell
  • pass: No recursive delete of root, home or parent
  • pass: No instruction to read or print local credentials
  • pass: No base64 blob over 200 characters
  • pass: No link to a raw IP address
  • pass: No script tag

Source

GitHub

ncaq/konoka · 3 stars · license Apache-2.0 · pushed 2026-10-19 · branch master

API

GET https://markdownregistry.com/api/v1/artifacts/art_rcoo4baxsk5v3ch7
GET https://markdownregistry.com/api/v1/resolve?ref=ncaq/konoka/lens
GET https://markdownregistry.com/api/v1/blob/081a18826502d8cba1419f078d025979b7360961623d7d7e65e778a6a8100789

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.

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