A1 — Design & Master-Spec Consistency

A1 — Design & Master-Spec Consistency is a skill for Claude Code from Nagiliant/Genesis-Legacy-V2. It costs 44 tokens per session (787 once invoked), scanned A, original, Apache-2.0.

A review that compares the code with the design document and master specification, which describe how the system should be built and what it should do.

In plain words
What is it for?
Use it to check architecture, data flow, boundaries, dependencies, and feature coverage before the later quality review can begin.
Why use it?
It finds missing work, unauthorised additions, and differences between the intended design and the actual implementation.

Skill for Claude Code

Written for Claude Code: argument-hint in frontmatter.

Part of the genesis-spec-kit plugin — 23 skills shipped together

Good fit Use it to check architecture, data flow, boundaries, dependencies, and feature coverage before the later quality review can begin.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/nagiliant/genesis-legacy-v2/genesis-a1
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.

Any agent
npx skills add Nagiliant/Genesis-Legacy-V2 --skill genesis-a1
Clone the repo
git clone --depth 1 https://github.com/Nagiliant/Genesis-Legacy-V2

Made for: Claude Code.

Or install genesis-spec-kit, the plugin that ships this one along with the rest of its 23 skills.

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 A1 — Design & Master-Spec Consistency

README.md
[![agentmods](https://agentmods.dev/badge/skills/nagiliant/genesis-legacy-v2/genesis-a1/github.svg)](https://agentmods.dev/skills/nagiliant/genesis-legacy-v2/genesis-a1)
Your own site
<a href="https://agentmods.dev/skills/nagiliant/genesis-legacy-v2/genesis-a1"><img src="https://agentmods.dev/badge/skills/nagiliant/genesis-legacy-v2/genesis-a1/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 A1 — Design & Master-Spec Consistency

Your own site · 80×15
<a href="https://agentmods.dev/skills/nagiliant/genesis-legacy-v2/genesis-a1"><img src="https://agentmods.dev/badge/skills/nagiliant/genesis-legacy-v2/genesis-a1.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 44 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 787 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00044 $0.00787
Opus 5 $0.00022 $0.00394
Sonnet 5 $0.00009 $0.00157
Haiku 4.5 $0.00004 $0.00079

Measured 11d ago against content hash 6dfe8da87b1b, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

A1 — Design & Master-Spec Consistency 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 11d 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/genesis-a1/SKILL.md · 45 lines

How it starts

The opening of the file, as written. The whole thing — 45 lines — stays where its author put it; the contents beside it link to each section on GitHub.

A1 — Design + Master-Spec Consistency

The drift check, and the first lens. A1 compares what was actually built against the two authoritative intent documents — the design doc (architecture, data models, boundaries, technology choices, data flow) and the master spec (the WHAT). Has the architecture been honored? Are boundaries respected? Was anything built that isn't specified (scope creep), or specified but not built?

A1 is the gate-setter: /genesis-a3 cannot begin until A1 reports zero findings.

Inputs

  • design.md (required — refuse if missing) · spec.md (required — refuse if missing)
  • The group's micro specs and the implementation code in scope
  • The constitution · northstar.md · the project mode

Process

  1. Detect the mode (greenfield/brownfield/lowfield) — it drives the checklist.
  2. Confirm every spec in the group is implemented; if not, refuse: "Cannot audit — {spec-id} is not implemented."
  3. Design doc vs implementation: are architecture decisions reflected in code? boundaries respected? any forbidden/unconstitutional dependency introduced? does data flow match the design?
  4. Master spec vs implementation: anything implemented but not specified (scope creep)? anything specified but not implemented? did the micro-spec plan structure hold?
  5. Determine fix direction per divergence — code wrong → fix code; code right but docs stale → update docs; both → a finding for each. A1 is the only lens that judges fix direction; it does not assume the code is wrong. Where both directions are plausible, the finding declares which interpretation it assumes.
  6. (Brownfield) scope strictly to the spec's File Operations table; classify each finding Introduced (added on this branch) vs Inherited (pre-existing) via git blame. Both get fixed; the classification is reported.
  7. Write the report to audits/{scope}-a1.md: a design-consistency table (decision → code → match/drift), a spec-consistency table (FR/behavior → implemented → match/drift/extra), document-update recommendations, and a reasoning trace per finding.

Read the full file on GitHub · 45 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. 11d ago First seen · 45 lines · 44 tokens per session scan A 6dfe8da87b1b

Subscribe to this mod's changes

A1 — Design & Master-Spec Consistency is a skill published in the GitHub repository Nagiliant/Genesis-Legacy-V2 (2 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 44 tokens to every session and 787 once invoked, about $0.0002 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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