fsl-requirements-document

fsl-requirements-document is a skill for Claude Code, Codex from ymm-oss/fsl. It costs 145 tokens per session (2,359 once invoked), scanned A, original, Apache-2.0.

A skill for generating and maintaining a readable Markdown requirements document from a checked FSL requirements file.

In plain words
What is it for?
Use it to generate the document, add permitted editorial notes, inspect requirement claims, and re-check the result.
Why use it?
It gives stakeholders a human-readable document while checking that the document has not drifted from the verified specification.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/ymm-oss/fsl/fsl-requirements-document
Any agent
npx skills add ymm-oss/fsl --skill fsl-requirements-document
Clone the repo
git clone --depth 1 https://github.com/ymm-oss/fsl

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.

agentmods badge for fsl-requirements-document

README.md
[![agentmods](https://agentmods.dev/badge/skills/ymm-oss/fsl/fsl-requirements-document.svg)](https://agentmods.dev/skills/ymm-oss/fsl/fsl-requirements-document)
Your own site
<a href="https://agentmods.dev/skills/ymm-oss/fsl/fsl-requirements-document"><img src="https://agentmods.dev/badge/skills/ymm-oss/fsl/fsl-requirements-document.svg" alt="Measured on agentmods" height="20"></a>
Per session 145 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,359 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00145 $0.02359
Opus 5 $0.00072 $0.01179
Sonnet 5 $0.00029 $0.00472
Haiku 4.5 $0.00015 $0.00236

Measured 5d ago against content hash 04f032ac1810, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

fsl-requirements-document 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 5d 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.

skills/fsl-requirements-document/SKILL.md · 167 lines

How it starts

The opening of the file, as written. The whole thing — 167 lines — stays where its author put it; the contents beside it link to each section on GitHub.

FSL Requirements Document — Generate, Annotate, Re-check

This skill turns a checked requirements (or direct spec) dialect file into a requirements document stakeholders can read, using the Requirement Claim IR (RCIR) pipeline: fslc document claims (the machine-readable contract), fslc document generate (deterministic ja/en Markdown), and fslc document check (structural drift detection). See ../fsl/SKILL.md and use its reference index only as needed for FSL syntax, verification, and repair — this skill only covers the document layer built on top of an already-checked spec. If the .fsl itself still needs authoring or repair, use fsl-requirements (or fsl-design) first and come back here once fslc check/fslc verify are green.

What this skill is for

The agent is an editor of non-normative content and a review-support assistant, not a compiler. Every normative sentence in the document — enablement conditions, effects, postconditions, fairness, deadlines, acceptance/forbidden traces — comes from a fixed template deterministically rendered from the checked FSL (issue #326). The agent never writes that text; it only fills in the one editable slot the generator leaves open (background), and only ever proposes findings about the source material, never encodes them into the normative sections itself.

Permitted operations

  • Edit the non-normative background slot: project context, a plain-language summary, review notes for stakeholders.
  • Propose a chapter reordering based on RCIR's own structure (e.g. grouping requirements by theme) — a suggestion for a human to apply, not a rewrite of generated content.
  • Draft glossary candidates (issue #330) for terms that appear in requirement text or claims.
  • Flag a candidate mismatch between the original requirement text and the formalized meaning as an advisory note — for example, source text that says "exactly once" where the formalized guard only enforces "at most once." Never strengthen the FSL-derived meaning to match the source text to make the mismatch disappear. Surfacing the gap is the value; resolving it is a human decision.
  • Flag a missing requirement tag, a missing acceptance/forbidden case, or an undecided item that looks resolvable, as a review note.
  • Point a stakeholder at a requirement whose assurance class is not_run in every dimension (issue #332) as a review note — never supply evidence yourself or assert a stronger class than the document already shows; the --evidence files come from real verification runs, not from the agent.
  • Point a stakeholder at a document with no "Approval records" section (issue #333) as a review note ("this document is not yet approved") — never fabricate an approval record or assert that a document is approved without one.

Read the full file on GitHub · 167 lines

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. 5d ago First seen · 167 lines · 145 tokens per session scan A 04f032ac1810

Subscribe to this mod's changes

fsl-requirements-document is a skill published in the GitHub repository ymm-oss/fsl (23 stars, last pushed yesterday), licensed Apache-2.0. It adds 145 tokens to every session and 2,359 once invoked, about $0.0007 per session on Opus 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.

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