requirements-specification

A requirements-writing guide that turns a vague development request into a versioned specification. The specification records acceptance criteria, open questions, risks, and whether the work is full-sized or lightweight.

In plain words
What is it for?
Use it when starting a new feature, fix, or ticket that does not already have a locked specification.
Why use it?
It gives later planning, coding, testing, review, and deployment steps a shared agreement about what must be built.

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/fusebase-dev/fusebase-flow/requirements-specification
Any agent
npx skills add fusebase-dev/fusebase-flow --skill requirements-specification
Clone the repo
git clone --depth 1 https://github.com/fusebase-dev/fusebase-flow

Made for: Claude Code, Codex.

Per session 61 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,613 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 $0.00061 $0.02613
Opus 5 $0.00030 $0.01307
Sonnet 5 $0.00012 $0.00523
Haiku 4.5 $0.00006 $0.00261

Measured 2d ago against content hash 497d6128bee8, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

requirements-specification 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 2d 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/requirements-specification/SKILL.md · 127 lines

How it starts

The opening of the file, as written. The whole thing — 127 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Requirements Specification

Purpose

Turn vague operator intent into a versioned spec with explicit acceptance criteria, unresolved clarify questions, and risk notes. The output is the contract every later skill (planning, implementation, validation, code review, security, deploy) reads.

When to invoke

  • Operator says "let's ship " / "build " / "add " / "fix " / "we need "
  • Backlog ticket exists at docs/backlog/<slug>/README.md and operator says "promote it"
  • Active phase is Specify or Clarify (per FLOW_RULES state announcement)

Do not invoke when

  • A spec at docs/specs/<slug>/spec.md already exists and is scope-locked (decisions frozen; decisions.md shows Lock status: LOCKED) or its status is DONE (spec Status is DRAFT-until-DONE; scope-lock is a decisions.md flag, not a Status value)
  • Operator is asking how something already works (use code-review or repo-onboarding-context-map instead)
  • Task is a one-line bug fix that does not need clarify (see "Skip-clarify gate" below)

Lane + documentation-budget classification first (FR-21 + FR-23)

Before drafting a spec, classify the ticket Full or Lightweight using the eligibility gate in flow-skills/lightweight-lane/SKILL.md. If the change is small, reversible, security-neutral, mechanically-verifiable, needs no architectural decision, and the root cause is known → it is Lightweight: do NOT draft spec/clarify/decisions/tasks/gate. Instead produce a single change-note (templates/change-note.md) and route to workflows/lightweight-lane.md (one build→verify→deploy pass, plain operator go-ahead). In doubt → Full (continue below). The skip-clarify gate that follows is a Full-lane micro-optimization (it skips clarify only); the Lightweight lane is the bigger lever for genuinely small work.

Then run the FR-23 documentation-budget classifier (flow-skills/documentation-budget/SKILL.md) before creating any spec artifact: Tier 0 (transient / already captured in code/tests/git) → no doc; Tier 1 (Lightweight) → change-note only; Tier 2 (mid-flight restart) → docs/tmp/handoff.md only; Tier 3/4 → proceed to a full spec below. Do NOT create docs/specs/<slug>/ artifacts for Tier 0/1/2 work. When unsure between tiers, choose the higher.

Read the full file on GitHub · 127 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. 2d ago First seen · 127 lines · 61 tokens per session scan A 497d6128bee8

Subscribe to this mod's changes

requirements-specification is a skill published in the GitHub repository fusebase-dev/fusebase-flow (9 stars, last pushed 7d ago), licensed MIT. It adds 61 tokens to every session and 2,613 once invoked, about $0.0003 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 2026-08-31.

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