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AutoFixture.XUnit2.AutoMock: Instructions file for Codex

AGENTS.md

AutoFixture.XUnit2.AutoMock AGENTS.md is an instructions file for Codex, OpenCode from Accenture/AutoFixture.XUnit2.AutoMock. It costs 4,203 tokens per session, scanned B, original, MIT.

Project instructions for a C# library that lets xUnit2 tests automatically create test data and mock objects using Moq, FakeItEasy, or NSubstitute.

In plain words
What is it for?
Use it when developing, testing, or creating NuGet packages for AutoFixture.XUnit2.AutoMock and its three mocking-framework variants.
Why use it?
It reduces repeated test setup and records the commands needed to build, test, and package the library.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: mentions CLAUDE.md; mentions Claude Code; mentions AGENTS.md.

This is Accenture/AutoFixture.XUnit2.AutoMock's own configuration. It tells Codex and OpenCode how to work on AutoFixture.XUnit2.AutoMock 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 AutoFixture.XUnit2.AutoMock configures →

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is dotnet dotnet-stryker -f ../stryker-config.yml.

not rated 23repo yesterday B scan 4,203 tokens original MIT
View source ↗ Accenture/AutoFixture.XUnit2.AutoMock
Reuse

Borrowing it

Nothing to install: this file belongs to Accenture/AutoFixture.XUnit2.AutoMock. 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/Accenture/AutoFixture.XUnit2.AutoMock/master/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/Accenture/AutoFixture.XUnit2.AutoMock

Made for: Codex, OpenCode.

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README.md
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Per session 4,203 This file is loaded in full into every session.
When invoked 4,203 The same file — it is already loaded in full.
Security scan B 1 finding. 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 $0.04203 $0.04203
Opus 5.5 $0.01681 $0.01681
Sonnet 5.5 $0.00841 $0.00841
Haiku 4.5 $0.00420 $0.00420

Measured 2mo ago against content hash bcb2b61679b4, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

AutoFixture.XUnit2.AutoMock AGENTS.md scanned grade B with 1 finding 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.

Strips warnings and disclaimersmediumAnti-refusal

Omitting safety caveats hides risk from the user and is a common jailbreak preamble.

Enforces code style via `EnforceCodeStyleInBuild=true` and `TreatWarningsAsErrors=true`. A build that passes without warnings means all analyzers are satisfied.
AGENTS.md · 415 lines

How it starts

The opening of the file, as written. The whole thing — 415 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md - AI Agent Context for AutoFixture.XUnit2.AutoMock

This file provides context for AI coding assistants (Claude Code, GitHub Copilot, OpenAI Codex, Cursor, and others) working in this repository. Read it before making any changes.

What This Project Does

C# NuGet library collection that bridges:

  • AutoFixture - generates anonymous test data automatically
  • Mocking frameworks - Moq, FakeItEasy, NSubstitute

The result: xUnit2 test attributes that auto-generate both test data and mocks in one step, eliminating boilerplate setup in unit tests.

Published NuGet packages:

  • Objectivity.AutoFixture.XUnit2.AutoMoq (uses Moq)
  • Objectivity.AutoFixture.XUnit2.AutoFakeItEasy (uses FakeItEasy)
  • Objectivity.AutoFixture.XUnit2.AutoNSubstitute (uses NSubstitute)

Core is not published standalone - it is bundled into each of the three packages above.

Repository Layout

├── AGENTS.md / CLAUDE.md / README.md / CONTRIBUTING.md
├── GitVersion.yml / stryker-config.yml / dotnet-tools.json
└── src/
    ├── Objectivity.AutoFixture.XUnit2.AutoMock.sln   # Primary solution (all 8 projects)
    ├── Directory.Build.props / .editorconfig
    ├── Objectivity.AutoFixture.XUnit2.Core/           # Shared infrastructure (not published)
    ├── Objectivity.AutoFixture.XUnit2.Core.Tests/
    ├── Objectivity.AutoFixture.XUnit2.AutoMoq/
    ├── Objectivity.AutoFixture.XUnit2.AutoMoq.Tests/
    ├── Objectivity.AutoFixture.XUnit2.AutoFakeItEasy/
    ├── Objectivity.AutoFixture.XUnit2.AutoFakeItEasy.Tests/
    ├── Objectivity.AutoFixture.XUnit2.AutoNSubstitute/
    └── Objectivity.AutoFixture.XUnit2.AutoNSubstitute.Tests/

Build, Test, and Pack Commands

All commands run from the repository root.

Build

dotnet build src/Objectivity.AutoFixture.XUnit2.AutoMock.sln

Enforces code style via EnforceCodeStyleInBuild=true and TreatWarningsAsErrors=true. A build that passes without warnings means all analyzers are satisfied.

Read the full file on GitHub · 415 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. 2mo ago First seen · 415 lines · 4,203 tokens per session scan B bcb2b61679b4

Subscribe to this mod's changes

AutoFixture.XUnit2.AutoMock AGENTS.md is an instructions file published in the GitHub repository Accenture/AutoFixture.XUnit2.AutoMock (23 stars, last pushed yesterday), licensed MIT. It adds 4,203 tokens to every session, about $0.0168 per session on Opus 5.5. A static security scan graded it B with 1 finding (strips warnings and disclaimers). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

autofixturefakeiteasymockmoqnsubstitutexunit
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