spec-authoring

spec-authoring is a skill for Claude Code from ddddjaak/se-skills. It costs 111 tokens per session (6,512 once invoked), scanned A, original, MIT.

A specification-writing skill for producing a software outline design, a hardware-software interface specification, and a test plan. These documents describe implementation details, interfaces, and measurable test conditions from requirements and architecture.

In plain words
What is it for?
Use it to write formal software designs, define hardware-software interfaces, and create test plans with clear pass/fail criteria.
Why use it?
It turns agreed system requirements and architecture into structured documents that engineers can build and test against. It also makes missing details and unsupported claims easier to spot.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the se-skills plugin — 16 skills, 6 commands, 5 agents, 1 hook, 3 MCP servers shipped together

Good fit Use it to write formal software designs, define hardware-software interfaces, and create test plans with clear pass/fail criteria.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/ddddjaak/se-skills/spec-authoring
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 ddddjaak/se-skills --skill spec-authoring
Clone the repo
git clone --depth 1 https://github.com/ddddjaak/se-skills

Made for: Claude Code.

Or install se-skills, the plugin that ships this one along with the rest of its 16 skills, 6 commands, 5 agents, 1 hook, 3 MCP servers.

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 spec-authoring

README.md
[![agentmods](https://agentmods.dev/badge/skills/ddddjaak/se-skills/spec-authoring/github.svg)](https://agentmods.dev/skills/ddddjaak/se-skills/spec-authoring)
Your own site
<a href="https://agentmods.dev/skills/ddddjaak/se-skills/spec-authoring"><img src="https://agentmods.dev/badge/skills/ddddjaak/se-skills/spec-authoring/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 spec-authoring

Your own site · 80×15
<a href="https://agentmods.dev/skills/ddddjaak/se-skills/spec-authoring"><img src="https://agentmods.dev/badge/skills/ddddjaak/se-skills/spec-authoring.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 111 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 6,512 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 $0.00111 $0.06512
Opus 5 $0.00056 $0.03256
Sonnet 5 $0.00022 $0.01302
Haiku 4.5 $0.00011 $0.00651

Measured 9d ago against content hash 505a47bc0d56, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

spec-authoring 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 9d 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/spec-authoring/SKILL.md · 440 lines

How it starts

The opening of the file, as written. The whole thing — 440 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Spec Authoring

Overview

Architecture design says how the system fits together. Specifications say how to implement each piece. They are the contract between the SE (who designed the system) and the engineers (who build and test it). A specification that is missing a section — error handling, concurrency model, timing budget — silently communicates that those aspects were not designed.

This skill produces three specification types from a common base of requirements and architecture: the Software Outline Design (软件概要设计), the Hardware-Software Interface Specification (软硬件接口规格), and the Test Plan (测试方案). Each has a different audience and a different structure, but all draw from the same upstream artifacts and all enforce the same standard: every claim traces to a requirement, every interface is fully defined, every test case has quantified pass/fail criteria.

Spec authoring is to SE what specification-driven development is to software development — but for chip-vendor specification formats rather than software feature specs.

When to Use

  • Architecture design is complete and confirmed, and formal specification documents are needed
  • Need to produce the Software Outline Design (软件概要设计) for the firmware team
  • Need to produce the Hardware-Software Interface Specification for cross-department alignment
  • Need to produce the Test Plan (测试方案) for the validation team
  • A specific specification document is requested by a downstream team
  • Adding a new module to an existing system that needs its own specification section

When NOT to use:

  • Architecture is not yet designed or confirmed (run architecture-design first, or invoke it inline)
  • The document already exists and needs only a minor text update (edit the document directly)
  • Pure documentation formatting (this skill generates content; template styling is a separate concern)
  • The request is for a one-page interface memo, not a full formal specification

The Process

SELECT ──→ GATHER ──→ GENERATE ──→ CROSS-CHECK ──→ FINALIZE
  │          │           │             │              │
  ▼          ▼           ▼             ▼              ▼
 Choose    Collect     Author       Verify          Human
 which     all input   the spec     internal        review &
 spec(s)   artifacts   content      consistency     sign-off

Read the full file on GitHub · 440 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. 9d ago First seen · 440 lines · 111 tokens per session scan A 505a47bc0d56

Subscribe to this mod's changes

spec-authoring is a skill published in the GitHub repository ddddjaak/se-skills (4 stars, last pushed 1mo ago), licensed MIT. It adds 111 tokens to every session and 6,512 once invoked, about $0.0006 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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