sdd:adr

sdd:adr is a skill for Claude Code from alfredoperez/sdd. It costs 20 tokens per session (415 once invoked), scanned A, original, MIT.

A command for creating an Architectural Decision Record, a short document that captures an important technical choice and its reasoning. It creates the document in a project using Spec-Driven Development, where written specifications guide implementation.

In plain words
What is it for?
Use it to start a decision record for choices such as a caching strategy or authentication provider.
Why use it?
It gives technical decisions a consistent place and numbering scheme instead of leaving them scattered in conversations or code.

Skill for Claude Code

Written for Claude Code: $ARGUMENTS substitution. Also seen: names the AskUserQuestion tool.

Part of the sdd plugin — 11 skills shipped together

Good fit Use it to start a decision record for choices such as a caching strategy or authentication provider.

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

Made for: Claude Code.

Or install sdd, the plugin that ships this one along with the rest of its 11 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 sdd:adr

README.md
[![agentmods](https://agentmods.dev/badge/skills/alfredoperez/sdd/adr.svg)](https://agentmods.dev/skills/alfredoperez/sdd/adr)
Your own site
<a href="https://agentmods.dev/skills/alfredoperez/sdd/adr"><img src="https://agentmods.dev/badge/skills/alfredoperez/sdd/adr.svg" alt="Measured on agentmods" height="20"></a>
Per session 20 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 415 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 $0.00020 $0.00415
Opus 5 $0.00010 $0.00208
Sonnet 5 $0.00004 $0.00083
Haiku 4.5 $0.00002 $0.00042

Measured 7d ago against content hash a4c05d6278be, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

sdd:adr 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 7d 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/adr/SKILL.md · 43 lines

What it actually says

Usage: /sdd:adr <slug><slug> is kebab-case, descriptive (e.g., cache-strategy, auth-provider-choice).

Steps

1. Validate inputs

Require $ARGUMENTS (the slug). If empty, stop: Usage: /sdd:adr <slug>.

Slug rules: 2–4 words, kebab-case. If invalid, suggest a corrected version.

2. Determine ADR number

Scan .sdd/decisions/*.md. Find the highest existing 4-digit prefix. New ADR number is highest + 1, zero-padded to 4 digits (e.g., 0001, 0002, ..., 0042).

If .sdd/decisions/ doesn't exist, prompt: Run /sdd:init first. and stop.

3. Create file

Write .sdd/decisions/{NNNN}-{slug}.md from lib/templates/adr.md, substituting:

  • {NNNN} → 4-digit number from Step 2
  • {Title} → ask user via AskUserQuestion for a one-line title (or derive Title Case from slug if user accepts)
  • {TODAY} → current date (YYYY-MM-DD)
  • {deciders}git config user.name (default), user can override

4. Summary

✓ ADR {NNNN} drafted

📂 .sdd/decisions/{NNNN}-{slug}.md

Status: Proposed
Title: {Title}

Edit the file to fill Context, Decision, Rationale, Alternatives, and Consequences sections.
Commit when ready: `git add .sdd/decisions/{NNNN}-{slug}.md && git commit -m "docs(adr): add ADR {NNNN}..."`.
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. 7d ago First seen · 43 lines · 20 tokens per session scan A a4c05d6278be

Subscribe to this mod's changes

sdd:adr is a skill published in the GitHub repository alfredoperez/sdd (2 stars, last pushed 15d ago), licensed MIT. It adds 20 tokens to every session and 415 once invoked, about $0.0001 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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