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.
npx agentmods add skills/managedcode/prompterone/mcaf-testingnpx skills add managedcode/PrompterOne --skill mcaf-testinggit clone --depth 1 https://github.com/managedcode/PrompterOneWhat 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 | $0.00056 | $0.01130 |
| Opus 5 | $0.00028 | $0.00565 |
| Sonnet 5 | $0.00011 | $0.00226 |
| Haiku 4.5 | $0.00006 | $0.00113 |
Grade A, and why
mcaf-testing 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 2d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- mcaf-testing — 91% identical, 27 lines differ
How it starts
The opening of the file, as written. The whole thing — 113 lines — stays where its author put it; the contents beside it link to each section on GitHub.
MCAF: Testing
Trigger On
- implementing a feature or bugfix
- adding a regression test for a failure
- protecting a refactor with automated verification
Value
- produce a concrete project delta: code, docs, config, tests, CI, or review artifact
- reduce ambiguity through explicit planning, verification, and final validation skills
- leave reusable project context so future tasks are faster and safer
Do Not Use For
- repo-wide delivery policy with no test change
- documentation-only changes unless they alter executable verification
Inputs
- the nearest
AGENTS.md - the changed behaviour and touched boundaries
- existing tests near the impacted code path
Quick Start
- Read the nearest
AGENTS.mdand confirm scope and constraints. - Run this skill's
Workflowthrough theRalph Loopuntil outcomes are acceptable. - Return the
Required Result Formatwith concrete artifacts and verification evidence.
Workflow
- Read the repo’s real verification commands from
AGENTS.md. - Start with a failing test first when the change adds behaviour or fixes a bug.
- Start with the smallest meaningful test scope:
- new or changed tests
- related suite
- broader regressions
- When the stack is .NET, use the external
.NETskills from the Managed Code Skills catalog, usemcaf-dotnetas the orchestration skill when the task spans code, tests, and verification, and route framework mechanics through exactly one matching skill:mcaf-dotnet-xunitmcaf-dotnet-tunitmcaf-dotnet-mstest
- Prefer integration, API, or UI coverage when behaviour crosses boundaries.
- Prove the user flow or caller-visible system flow, not just internal details.
- Add a regression test for every bug that can be captured reliably.
- If the stack is .NET and production code changed, do not stop at tests only. Finish with the repo-defined format and analyzer pass as well.
- Use deeper testing references only when the repo’s current strategy is unclear.
What ships with it
2 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.
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.
- 2d ago First seen · 113 lines · 56 tokens per session scan A ea0e390d617d
mcaf-testing is a skill published in the GitHub repository managedcode/PrompterOne (42 stars, last pushed 3mo ago), licensed MIT. It adds 56 tokens to every session and 1,130 once invoked, about $0.0003 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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