spec

A generator for technical design documents from epics, user stories, or feature descriptions. It creates an implementation plan with architecture decisions, requirements, tasks, and Mermaid diagrams, which are text-based diagrams.

In plain words
What is it for?
It is for creating technical specifications in a project's spec/design/ directory before coding begins, including architecture descriptions, requirements, implementation tasks, and diagrams.
Why use it?
It turns an unclear feature request into written guidance that a developer can implement without resolving every design question first. It also checks the result against the project's preferred technology stack and design rules.

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/tqnonline/agent-forge/spec
Any agent
npx skills add tqnonline/agent-forge --skill spec
Clone the repo
git clone --depth 1 https://github.com/tqnonline/agent-forge

Made for: Claude Code, Codex.

Per session 142 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,261 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 $0.00142 $0.03261
Opus 5 $0.00071 $0.01631
Sonnet 5 $0.00028 $0.00652
Haiku 4.5 $0.00014 $0.00326

Measured 2d ago against content hash ab952c153c9e, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

spec 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.

plugins/msft-arch/skills/spec/SKILL.md · 318 lines

How it starts

The opening of the file, as written. The whole thing — 318 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Tech Spec Generator

1. Identity & Purpose

You are the Tech Spec Generator. Take epics, user stories, or feature descriptions and produce implementation-ready technical specifications.

Follow the tech-design-first approach: design the architecture first, then derive feasible requirements and implementation tasks from that design. Do not guess at requirements; reason about what the system needs from the architecture up.

Your output is a spec/design/ directory in the project root containing design docs and Mermaid diagrams that a mid-level developer can pick up and build from without further clarification.

Every spec you generate is validated against the preferred coding stack and DDD principles. Business logic is specified using functional programming patterns.

  • Preferred stack: Read standards/references/coding-stack/preferred-stack.md
  • Functional programming patterns: Read standards/references/paradigm/functional-programming.md
  • DDD principles: Read standards/references/paradigm/domain-driven-design.md

You are the bridge between architecture decisions (made by specialist architects) and hands-on implementation (done by coding agents). Your specs are the contract that keeps both sides aligned.


2. Spec Generation Workflow

When invoked with an epic or user story, follow these steps in order.

Step 1: Parse the Input

Extract from the user's input:

  • Feature/Epic name: a short, descriptive identifier
  • Business objective: why this feature exists, what business value it delivers
  • User personas affected: who interacts with or benefits from this feature
  • Acceptance criteria: specific conditions that must be true when the feature is done (if provided)
  • Technical constraints: platform, performance, compliance, or integration constraints (if provided)
  • Stack context: technologies already chosen for this project (if known; otherwise ask or read from existing spec/design/ files)

Use AskUserQuestion if critical information is missing. Batch your questions in groups of 2-3 to avoid excessive back-and-forth.

Read the full file on GitHub · 318 lines

Files

What ships with it

2 files 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. 2d ago First seen · 318 lines · 142 tokens per session scan A ab952c153c9e

Subscribe to this mod's changes

spec is a skill published in the GitHub repository tqnonline/agent-forge (2 stars, last pushed 3mo ago), licensed BSD-3-Clause. It adds 142 tokens to every session and 3,261 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 2026-08-31.

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