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repren: Skill for Claude Code

.agents/skills/flowmark/SKILL.md

flowmark is a skill for Claude Code from jlevy/repren. It costs 64 tokens per session (626 once invoked), scanned A, original, MIT.

A Markdown formatter for cleaning up typography, spacing, and line breaks in Markdown files. Markdown is a plain-text format commonly used for documentation.

In plain words
What is it for?
Use it to format one file or a whole repository, preview changes, adopt formatting in a project, add Makefile or commit-hook support, and replace another Markdown formatter.
Why use it?
It keeps documentation changes consistent and readable while leaving code blocks and inline code unchanged.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: installed under .agents/ (shared by several agents).

This is jlevy/repren's own configuration. It tells Claude Code how to work on repren itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything repren configures →

not rated 375repo +1 2mo ago A scan SkillSpector: warn 64 tokens original MIT
View source ↗ jlevy/repren
Reuse

Borrowing it

Nothing to install: this file belongs to jlevy/repren. 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/jlevy/repren/master/.agents/skills/flowmark/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/jlevy/repren

Made for: Claude Code.

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 flowmark

README.md
[![agentmods](https://agentmods.dev/badge/skills/jlevy/repren/flowmark/github.svg)](https://agentmods.dev/skills/jlevy/repren/flowmark)
Your own site
<a href="https://agentmods.dev/skills/jlevy/repren/flowmark"><img src="https://agentmods.dev/badge/skills/jlevy/repren/flowmark/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 flowmark

Your own site · 80×15
<a href="https://agentmods.dev/skills/jlevy/repren/flowmark"><img src="https://agentmods.dev/badge/skills/jlevy/repren/flowmark.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 64 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 626 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. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 1 finding, up to high

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • high Prompt Injection · line 6
    Hidden instructions were detected in comments or invisible text. These could contain malicious directives. Manual review is recommended.
    Fix: Audit all comments and invisible characters. Remove any instructions that direct the agent to perform unauthorized actions. Use plain, reviewable content.
How audits are shown
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 $0.00064 $0.00626
Opus 5.5 $0.00026 $0.00250
Sonnet 5.5 $0.00013 $0.00125
Haiku 4.5 $0.00006 $0.00063

Measured 2mo ago against content hash 02aedf69dfa1, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

flowmark 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 2mo 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.

.agents/skills/flowmark/SKILL.md · 63 lines

How it starts

The opening of the file, as written. The whole thing — 63 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Flowmark - Markdown Auto-Formatter

Fast, consistent Markdown auto-formatter. Run it on Markdown you generate or edit so committed diffs stay small and readable. It is conservative and safe to run on every file: it never modifies code blocks or inline code.

Format Markdown

Format in place with all auto-formatting (typography, cleanups, semantic line breaks):

flowmark --auto FILE   # one file
flowmark --auto .      # whole tree (respects .gitignore and .flowmarkignore)

Omit --auto to preview to stdout; pipe stdin with - (e.g. cat FILE | flowmark -).

Use flowmark when it is already on PATH. Otherwise use the fast Rust port with a version-pinned uvx runner (never @latest):

uvx --from flowmark-rs==0.3.2 flowmark --auto FILE

The Python reference remains available when its library API or a newer unported patch is required:

uvx --from flowmark==0.7.3 flowmark --auto FILE

Adopt Flowmark in a Repository

If this skill came from flowmark --skill, run the same runner with --install-skill from the project root to materialize the complete bundle. Then, for a repository-wide migration, Makefile wiring, .flowmarkignore, commit hooks, CI policy, and disabling Prettier or other competing Markdown formatters, read project-setup.md in full before editing.

Full Documentation

Flowmark documents itself. Use the CLI rather than reproducing details here:

  • flowmark --help — every flag: --semantic, --smartquotes, --ellipses, --width, --check, list spacing, and file discovery (--extend-include/--extend-exclude).
  • flowmark --docs — the full guide: configuration, file discovery, editor setup, the Python library API, and installing this skill (flowmark --install-skill).

Read the full file on GitHub · 63 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 2mo ago First seen · 63 lines · 64 tokens per session scan A 02aedf69dfa1

Subscribe to this mod's changes

flowmark is a skill published in the GitHub repository jlevy/repren (375 stars, last pushed 2mo ago), licensed MIT. It adds 64 tokens to every session and 626 once invoked, about $0.0003 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 2026-08-30.

Writing and docscommand-linerefactoringregular-expressionrenamessearch-and-replace
Related

flowmark compared with skills from other repositories

flowmark next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
flowmarkjlevy/reprenSkill3752mo agoMITA64Claude Code
resolve-conflictstailcallhq/forgecodeSkill7.6kyesterdayApache-2.0A68Claude Code, Codex
github-pr-descriptiontailcallhq/forgecodeSkill7.6kyesterdayApache-2.0A72Claude Code, Codex
create-github-issuetailcallhq/forgecodeSkill7.6kyesterdayApache-2.0A63Claude Code, Codex
execute-plantailcallhq/forgecodeSkill7.6kyesterdayApache-2.0A46Claude Code, Codex
post-forge-featuretailcallhq/forgecodeSkill7.6kyesterdayApache-2.0A51Claude Code, Codex
code-reviewjrswab/axeSkill90915d agoApache-2.0A0Claude Code, Codex