A template-based way to record one important software architecture decision, including the decision, its context, and its consequences.

Use it when choosing a system design, technology, or architectural approach that future developers will need to understand.

It prevents important technical choices from being forgotten or repeatedly debated without a written record.

adr — Skill for Claude Code and Codex by joestump: A template-based way to record one important software architecture…

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/joestump/claude-plugin-sdd/adr

Any agent

npx skills add joestump/claude-plugin-sdd --skill adr

Clone the repo

git clone --depth 1 https://github.com/joestump/claude-plugin-sdd

Made for: Claude Code, Codex.

Or install sdd, the plugin that ships this one along with the rest of its 20 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/joestump/claude-plugin-sdd/adr.svg)](https://agentmods.dev/skills/joestump/claude-plugin-sdd/adr)

Your own site

<a href="https://agentmods.dev/skills/joestump/claude-plugin-sdd/adr"><img src="https://agentmods.dev/badge/skills/joestump/claude-plugin-sdd/adr.svg" alt="Measured on agentmods" height="20"></a>

Per session 49 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 5,542 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.

Model	Per session	Once invoked
Fable 5	$0.00049	$0.05542
Opus 5	$0.00024	$0.02771
Sonnet 5	$0.00010	$0.01108
Haiku 4.5	$0.00005	$0.00554

Measured today against content hash d8ccbcd5617a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

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 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/adr/SKILL.md · 305 lines

How it starts

The opening of the file, as written. The whole thing — 305 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Create an Architecture Decision Record (ADR)

Harness portability. This skill runs on any agent harness that loads Agent Skills — Claude Code, Codex CLI, OpenCode, Crush. Tool names used below (AskUserQuestion, Task, TeamCreate, SendMessage, TaskCreate, ToolSearch, mcp__*, ${CLAUDE_PLUGIN_ROOT}) denote capabilities, not hard requirements: map each to your harness's equivalent or use the documented fallback per ${CLAUDE_PLUGIN_ROOT}/references/harness-compat.md. References to CLAUDE.md mean the project memory file (CLAUDE.md, AGENTS.md, or CRUSH.md) per harness-compat § "Project Memory File". A citation of the form shared-patterns.md § "Section" names one ## heading in that file — load only that section (see its "How to Read This File" note), never the whole file.

You are creating a new ADR using the MADR (Markdown Architectural Decision Records) format.

Process

Resolve artifact paths: Follow the Artifact Path Resolution pattern from ${CLAUDE_PLUGIN_ROOT}/references/shared-patterns.md § "Artifact Path Resolution" to determine the ADR directory. If $ARGUMENTS contains --module <name>, resolve paths relative to that module. The resolved ADR directory is referred to as {adr-dir} below.
Determine the next ADR number: Scan {adr-dir} for existing ADR-XXXX-*.md files and increment to the next number. Start at ADR-0001 if none exist. Create {adr-dir} if it does not exist. If $ARGUMENTS is empty (ignoring flags like --quick, --review and --module), use AskUserQuestion to ask the user what decision they want to document.

1a. qmd-aware edge pre-search (v5.0.0+):

Before drafting, qmd-search the existing ADR corpus to find related prior decisions whose IDs SHOULD appear in the new ADR's frontmatter as supersedes, extends, or related edges (per ADR-0023 / SPEC-0018 frontmatter DAG).

Read the full file on GitHub · 305 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.

today Changed · +51 lines d8ccbcd5617a
yesterday Changed 9b61b9ce1ebd
5d ago First seen · 254 lines · 49 tokens per session scan A 588b82e7a953

Subscribe to this mod's changes

adr is a skill published in the GitHub repository joestump/claude-plugin-sdd (32 stars, last pushed yesterday), licensed MIT. It adds 49 tokens to every session and 5,542 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 2026-08-30.

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