A guide for adopting MCAF, a set of software-development governance practices, in a .NET repository. It organizes project instructions, documentation, installed skills, and checks for substantial work.

Use it when starting or updating MCAF in a .NET solution, arranging AGENTS.md instructions, choosing governance and implementation skills, or organizing architecture, feature, testing, and operations documents.

Without shared project rules, developers and coding agents may follow inconsistent processes or duplicate guidance. This provides a structure for keeping development work and documentation aligned.

How managedcode/PrompterOne configures Codex

Reuse

Borrowing it

Nothing to install: this file belongs to managedcode/PrompterOne. 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/PrompterOne/main/.codex/skills/dotnet-mcaf/SKILL.md

Clone the repo

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

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/prompterone/dotnet-mcaf/github.svg)](https://agentmods.dev/skills/managedcode/prompterone/dotnet-mcaf)

Your own site

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

Per session 57 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 980 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	$0.00057	$0.00980
Opus 5.5	$0.00023	$0.00392
Sonnet 5.5	$0.00011	$0.00196
Haiku 4.5	$0.00006	$0.00098

Measured 1mo ago against content hash 26f34d21bdff, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

dotnet-mcaf 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 1mo 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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

dotnet-mcaf — 98% identical, 2 lines differ

.codex/skills/dotnet-mcaf/SKILL.md · 88 lines

How it starts

The opening of the file, as written. The whole thing — 88 lines — stays where its author put it; the contents beside it link to each section on GitHub.

MCAF Adoption

Trigger On

bootstrapping MCAF in a new or existing repository that also contains .NET work
updating root or project-local AGENTS.md files to follow a durable repo workflow
deciding which MCAF governance skills and dotnet-* implementation skills to install together
organizing repo-native docs for architecture, features, ADRs, testing, development, and operations

Workflow

Start from the canonical bootstrap surface:
- tutorial: https://mcaf.managed-code.com/tutorial
- concepts: https://mcaf.managed-code.com/
- public MCAF skills: https://mcaf.managed-code.com/skills
Place root AGENTS.md at the repository or solution root.
Add project-local AGENTS.md only when the solution has multiple projects with genuinely different local rules.
Install MCAF governance skills (dotnet-mcaf-*) for process areas and dotnet-* implementation skills for framework work. Check references/skill-map.md for overlap before adding duplicate surfaces.

Route to the narrowest MCAF skill once the governance concern is clear:

Concern	Skill
Delivery workflow and feedback loops	`dotnet-mcaf-agile-delivery`
Developer onboarding and local inner loop	`dotnet-mcaf-devex`
Durable docs structure and source-of-truth placement	`dotnet-mcaf-documentation`
Executable feature behaviour docs	`dotnet-mcaf-feature-spec`
Human review for large AI-generated drops	`dotnet-mcaf-human-review-planning`
ML/AI product delivery process	`dotnet-mcaf-ml-ai-delivery`
Explicit quality attributes and trade-offs	`dotnet-mcaf-nfr`
Branch, merge, and release hygiene	`dotnet-mcaf-source-control`
Design-system, accessibility, front-end direction	`dotnet-mcaf-ui-ux`

Scaffold repo-native documentation:

docs/
├── Architecture.md
├── Features/
├── ADR/
├── Testing/
├── Development/
└── Operations/

Encode the non-trivial task flow in AGENTS.md: <slug>.brainstorm.md then <slug>.plan.md then implementation and validation.
Treat verification as part of done: tests, analyzers, formatters, coverage, and any architecture or security gates the repo configured.

Read the full file on GitHub · 88 lines

Files

What ships with it

3 files 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.

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.

1mo ago First seen · 88 lines · 57 tokens per session scan A 26f34d21bdff

Subscribe to this mod's changes

dotnet-mcaf is a skill published in the GitHub repository managedcode/PrompterOne (45 stars, last pushed 5mo ago), licensed MIT. It adds 57 tokens to every session and 980 once invoked, about $0.0002 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 2026-08-30.

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PrompterOne: Skill for Codex