spec-adr-builder

spec-adr-builder is a skill for Claude Code, Codex from CassioRoos/godfly-skills. It costs 62 tokens per session (465 once invoked), scanned A, original, MIT.

A guide for writing or reviewing technical specifications and Architecture Decision Records, or ADRs: documents that record important technical choices and their trade-offs.

In plain words
What is it for?
Use it to create or review specs, ADRs, RFCs, design documents, requirements, rollout plans, and rollback plans.
Why use it?
It helps prevent designs from covering only the happy path while leaving goals, alternatives, risks, testing, rollout, and rollback unclear.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to create or review specs, ADRs, RFCs, design documents, requirements, rollout plans, and rollback plans.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/cassioroos/godfly-skills/spec-adr-builder
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 CassioRoos/godfly-skills --skill spec-adr-builder
Clone the repo
git clone --depth 1 https://github.com/CassioRoos/godfly-skills

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 spec-adr-builder

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

Your own site · 80×15
<a href="https://agentmods.dev/skills/cassioroos/godfly-skills/spec-adr-builder"><img src="https://agentmods.dev/badge/skills/cassioroos/godfly-skills/spec-adr-builder.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 62 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 465 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 $0.00062 $0.00465
Opus 5 $0.00031 $0.00233
Sonnet 5 $0.00012 $0.00093
Haiku 4.5 $0.00006 $0.00047

Measured today against content hash 6b9e8059460a, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

spec-adr-builder 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 today.

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-adr-builder/SKILL.md · 96 lines

What it actually says

Spec / ADR Builder

Write decision docs that survive contact with implementation. A spec that only describes the happy path is half a spec.

Spec Workflow

  1. Define the problem and why now.
  2. Define goals and non-goals.
  3. Identify users, systems, and constraints.
  4. Map current behavior and target behavior.
  5. Compare alternatives, including doing nothing and using existing tools.
  6. Define acceptance criteria and test strategy.
  7. Identify risks, failure modes, observability, rollout, and rollback.
  8. List open questions and decision deadlines.

Spec output:

# Spec: Title

## Problem

## Goals

## Non-goals

## Current State

## Proposed Solution

## Alternatives Considered

## API / Data / Behavior Changes

## Failure Modes And Mitigations

## Observability

## Test Plan

## Rollout Plan

## Rollback Plan

## Open Questions

ADR Workflow

Use ADRs when a decision has lasting consequences or tradeoffs.

ADR output:

# ADR: Title

## Status
Proposed | Accepted | Superseded

## Context

## Decision

## Alternatives Considered

## Consequences

## Validation

## Rollout / Migration

Review Rules

Label proposed, accepted, implemented and deployed states separately. An accepted ADR or complete rollout plan does not prove implementation or release completion. Pin implementation claims to current code/tests and deployment claims to runtime evidence; mark unverified stages explicitly.

  • If there are no non-goals, the scope is not controlled.
  • If there are no alternatives, the decision is under-argued.
  • If recovery/rollback or irreversibility is unspecified, the rollout plan is incomplete.
  • If there is no validation, it is opinion dressed up as a plan.
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. today Changed · +7 lines · +12 tokens per session 6b9e8059460a
  2. 9d ago First seen · 89 lines · 50 tokens per session scan A 7e750a7d6bda

Subscribe to this mod's changes

spec-adr-builder is a skill published in the GitHub repository CassioRoos/godfly-skills (1 stars, last pushed today), licensed MIT. It adds 62 tokens to every session and 465 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.