AdrMcp: Skill for Claude Code

.claude/skills/adr-author/SKILL.md

adr-author is a skill for Claude Code from Atypical-Consulting/AdrMcp. It costs 113 tokens per session (811 once invoked), scanned A, original, MIT.

A guide for creating an Architectural Decision Record, or ADR—a short document explaining an important technical choice and its consequences.

In plain words
What is it for?
It helps decide whether a choice deserves an ADR, check existing records, and create and validate the document through AdrMcp tools.
Why use it?
It helps teams record why a significant architecture decision was made and avoid duplicate or conflicting decisions.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

This is Atypical-Consulting/AdrMcp's own configuration. It tells Claude Code how to work on AdrMcp itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything AdrMcp configures →

Reuse

Borrowing it

Nothing to install: this file belongs to Atypical-Consulting/AdrMcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/Atypical-Consulting/AdrMcp/dev/.claude/skills/adr-author/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/Atypical-Consulting/AdrMcp

Made for: Claude Code.

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.

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README.md
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Your own site
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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.

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Your own site · 80×15
<a href="https://agentmods.dev/skills/atypical-consulting/adrmcp/adr-author"><img src="https://agentmods.dev/badge/skills/atypical-consulting/adrmcp/adr-author.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 113 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 811 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 $0.00113 $0.00811
Opus 5 $0.00056 $0.00405
Sonnet 5 $0.00023 $0.00162
Haiku 4.5 $0.00011 $0.00081

Measured 8d ago against content hash 75844bc1ed9f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

adr-author 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 8d 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.

.claude/skills/adr-author/SKILL.md · 56 lines

How it starts

The opening of the file, as written. The whole thing — 56 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Authoring an ADR

You help the user turn a real architectural decision into a crisp, durable ADR. The MCP server handles mechanics (numbering, files, frontmatter, validation) — your job is the judgment and prose: is this decision worth recording, and is it framed honestly?

Requires the AdrMcp MCP server (tools create_adr, validate_adr, list_adrs). If those tools aren't available, tell the user to connect the AdrMcp server first.

Does this decision even warrant an ADR?

Record it when the decision is architecturally significant — it constrains future work and would be expensive to reverse. Good signals:

  • It affects structure, dependencies, interfaces, or cross-cutting concerns.
  • A future contributor will ask "why is it done this way?" and deserve an answer.
  • Reasonable engineers would have chosen differently; there were real alternatives.

Don't write an ADR for reversible, local, or obvious choices (variable names, a one-off bug fix, formatting). If it doesn't constrain the future, skip it and say so.

Workflow

  1. Check for overlap. Call list_adrs (or search_adrs) so you don't duplicate or silently contradict an existing decision. If one exists, consider adr-review or adr-supersede instead of a new record.
  2. Interview for the four parts (ask only what you can't infer from the codebase/context):
    • Context / problem — the forces at play, constraints, what makes this non-trivial.
    • Considered options — the real alternatives, not strawmen.
    • Decision — the chosen option, stated as a decision ("We will…"), not a discussion.
    • Consequences — what becomes easier AND what becomes harder / what we accept.
  3. Draft with create_adr (template=madr default), previewOnly=true first so the user sees the diff. Pass tags for the architectural area, deciders if known.
  4. Validate with validate_adr on the new id; fix any errors (missing sections, dangling links) before committing.
  5. Commit by re-calling create_adr with previewOnly=false once the user approves.
  6. New ADRs start as proposed. Use set_status to move to accepted only when the decision is actually adopted.

Read the full file on GitHub · 56 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. 8d ago First seen · 56 lines · 113 tokens per session scan A 75844bc1ed9f

Subscribe to this mod's changes

adr-author is a skill published in the GitHub repository Atypical-Consulting/AdrMcp (1 stars, last pushed 18d ago), licensed MIT. It adds 113 tokens to every session and 811 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.

Related

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bootstrap

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