What is mcaf-adr-writing?

A process for writing an Architecture Decision Record, or ADR, under docs/ADR/. An ADR is a short permanent record of an important technical choice, its alternatives, effects, rollout, and verification.

Use it when changing architecture, module boundaries, dependencies, data models, or shared patterns, and when the decision needs documented scope, alternatives, invariants, stakeholders, rollout steps, and tests.

It makes architectural changes explicit and reviewable instead of leaving decisions scattered across conversations or code. It also checks that the decision matches the repository’s actual components and verification commands.

How managedcode/GeminiSharpSDK configures Codex

Reuse

Borrowing it

Nothing to install: this file belongs to managedcode/GeminiSharpSDK. 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/managedcode/GeminiSharpSDK/main/.codex/skills/mcaf-adr-writing/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/managedcode/GeminiSharpSDK

Made for: 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/managedcode/geminisharpsdk/mcaf-adr-writing/github.svg)](https://agentmods.dev/skills/managedcode/geminisharpsdk/mcaf-adr-writing)

Your own site

<a href="https://agentmods.dev/skills/managedcode/geminisharpsdk/mcaf-adr-writing"><img src="https://agentmods.dev/badge/skills/managedcode/geminisharpsdk/mcaf-adr-writing/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/managedcode/geminisharpsdk/mcaf-adr-writing"><img src="https://agentmods.dev/badge/skills/managedcode/geminisharpsdk/mcaf-adr-writing.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 82 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 726 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.

Model	Per session	Once invoked
Fable 5.1	$0.00082	$0.00726
Opus 5.5	$0.00033	$0.00290
Sonnet 5.5	$0.00016	$0.00145
Haiku 4.5	$0.00008	$0.00073

Measured 2mo ago against content hash 72e8e44a72a4, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mcaf-adr-writing 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 2mo 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.

.codex/skills/mcaf-adr-writing/SKILL.md · 58 lines

How it starts

The opening of the file, as written. The whole thing — 58 lines — stays where its author put it; the contents beside it link to each section on GitHub.

MCAF: ADR Writing

Outputs

docs/ADR/ADR-XXXX-<short-title>.md (create or update)
Update docs/Architecture/Overview.md when boundaries/interactions change

Decision Quality (anti-guesswork checklist)

Before writing, make the ADR executable (no placeholders, no hand-waving):

Decision: one sentence. If you can’t write it, you don’t have a decision yet.
Scope: what changes / what does not + which module(s) are affected (match docs/Architecture/Overview.md names).
No invented reality: every component you mention exists in the repo today, or is explicitly part of this change (named + where it will live).
Invariants: write as MUST / MUST NOT statements and say how we prove each (test or static analysis).
Verification: use exact commands from AGENTS.md and link scenarios → test IDs.
Stakeholders: Product / Dev / DevOps / QA — what each role must know to execute safely.

Workflow

Confirm the decision scope:
- what changes (and what does not)
- what module(s) are affected
- follow AGENTS.md scoping rules: Architecture map → linked ADR/Feature → entry points (do not scan everything)
Start from docs/templates/ADR-Template.md.
- keep the ADR’s ## Implementation plan (step-by-step) updated while executing
Write the ADR as a decision record:
- Context: constraints + why this is needed now
- Decision: a short, direct statement
- Diagram (mandatory): include at least one Mermaid diagram for the decision (boundaries/modules/interactions)
- Alternatives: 1–3 realistic options with pros/cons
- Consequences: trade-offs, risks, mitigations
Make it executable for the team:
- follow AGENTS.md Task Delivery rules (analysis → plan → execute → verify)
- include the invariants that must be proven by tests
- include verification commands copied from AGENTS.md
- include rollout/rollback and “how we know it’s safe”
Make impacts explicit:
- code/modules affected
- data/config changes (including migration/rollback)
- backwards compatibility strategy
Add verification that proves the decision:
- which tests must exist/change
- which suites must stay green
If the decision changes boundaries, update docs/Architecture/Overview.md (diagram, modules table, dependency rules).

Read the full file on GitHub · 58 lines

Files

What ships with it

1 file 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.

references/ADR-FORMATS.md 5.8 KB

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.

2mo ago First seen · 58 lines · 82 tokens per session scan A 72e8e44a72a4

Subscribe to this mod's changes

mcaf-adr-writing is a skill published in the GitHub repository managedcode/GeminiSharpSDK (2 stars, last pushed 2d ago), licensed MIT. It adds 82 tokens to every session and 726 once invoked, about $0.0003 per session on Opus 5.5. 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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