What is haskell-format?

A formatting workflow for Haskell source files, using the formatter configured by the project. Haskell is a programming language, and formatting makes its source code follow a consistent layout.

Use it to format .hs, .lhs, and .hsig files with Fourmolu, Ormolu, or Stylish Haskell according to project settings.

It avoids hand-formatting disagreements and keeps changed source files aligned with the repository's style before compilation.

How SoftwareFoundationGroupAtKyotoU/pure-borrow configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to SoftwareFoundationGroupAtKyotoU/pure-borrow. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/SoftwareFoundationGroupAtKyotoU/pure-borrow/main/.codex/skills/haskell-format/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/SoftwareFoundationGroupAtKyotoU/pure-borrow

Made for: Claude Code, Codex.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/softwarefoundationgroupatkyotou/pure-borrow/haskell-format/github.svg)](https://agentmods.dev/skills/softwarefoundationgroupatkyotou/pure-borrow/haskell-format)

Your own site

<a href="https://agentmods.dev/skills/softwarefoundationgroupatkyotou/pure-borrow/haskell-format"><img src="https://agentmods.dev/badge/skills/softwarefoundationgroupatkyotou/pure-borrow/haskell-format/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/softwarefoundationgroupatkyotou/pure-borrow/haskell-format"><img src="https://agentmods.dev/badge/skills/softwarefoundationgroupatkyotou/pure-borrow/haskell-format.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 53 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 344 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.

Model	Per session	Once invoked
Fable 5.1	$0.00053	$0.00344
Opus 5.5	$0.00021	$0.00138
Sonnet 5.5	$0.00011	$0.00069
Haiku 4.5	$0.00005	$0.00034

Measured 1mo ago against content hash 6862c4932964, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

haskell-format 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.

.codex/skills/haskell-format/SKILL.md · 40 lines

What it actually says

Format Haskell Source

Format Haskell source files with the project's formatter. .cabal and cabal.project* files are handled by the haskell-cabal-gild skill. Always format before compiling.

Choosing The Formatter

Walk up from the file's directory and choose by project config:

fourmolu.yaml or .fourmolu.yaml selects fourmolu.
.stylish-haskell.yaml selects stylish-haskell.
Otherwise use the first available command in this order: fourmolu, ormolu, stylish-haskell.

This project has fourmolu.yaml, so prefer fourmolu when available.

Format In Place

All supported formatters accept -i:

fourmolu -i <file>
ormolu -i <file>
stylish-haskell -i <file>

Project Automation

This repository has shared PostToolUse hooks under .agents/hooks/, wired from Claude/Codex configuration. The Haskell formatting hook formats changed .hs, .lhs, and .hsig files. Re-read files if the hook reports that it changed them.

Companion

Format .cabal and cabal.project* files with the haskell-cabal-gild skill.

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.

1mo ago First seen · 40 lines · 53 tokens per session scan A 6862c4932964

Subscribe to this mod's changes

haskell-format is a skill published in the GitHub repository SoftwareFoundationGroupAtKyotoU/pure-borrow (63 stars, last pushed 1mo ago), licensed BSD-3-Clause. It adds 53 tokens to every session and 344 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 2026-10-02.

Languages

haskell-format next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
haskell-formatSoftwareFoundationGroupAtKyotoU/pure-borrow	Skill	63	1mo ago	BSD-3-Clause	A	53	Claude Code, Codex
erlang-otp-behaviorsbenchflow-ai/skillsbench	Skill	1.9k	2d ago	Apache-2.0	A	52	Claude Code, Codex
omh-rustrlaope/oh-my-hermes	Skill	5.2k	yesterday	MIT	A	74	Claude Code, Codex
axiom-concurrencyCharlesWiltgen/Axiom	Skill	1.3k	yesterday	MIT	A	49	Claude Code
tddcodewithmukesh/dotnet-claude-kit	Skill	805	2d ago	MIT	A	81	Claude Code
splitting-oversized-modulesPostHog/posthog	Skill	41k	yesterday	none	A	197	Claude Code, Codex
precisemicroprediction/precise	Skill	338	5d ago	MIT	A	76	Claude Code, Codex

pure-borrow: Skill for Claude Code