Borrowing it
Nothing to install: this file belongs to managedcode/MCPGateway. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/managedcode/MCPGateway/main/.codex/skills/mcaf-devex/SKILL.mdgit clone --depth 1 https://github.com/managedcode/MCPGatewayWrote 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.
[](https://agentmods.dev/skills/managedcode/mcpgateway/mcaf-devex)<a href="https://agentmods.dev/skills/managedcode/mcpgateway/mcaf-devex"><img src="https://agentmods.dev/badge/skills/managedcode/mcpgateway/mcaf-devex/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.
<a href="https://agentmods.dev/skills/managedcode/mcpgateway/mcaf-devex"><img src="https://agentmods.dev/badge/skills/managedcode/mcpgateway/mcaf-devex.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00049 | $0.00793 |
| Opus 5.5 | $0.00020 | $0.00317 |
| Sonnet 5.5 | $0.00010 | $0.00159 |
| Haiku 4.5 | $0.00005 | $0.00079 |
Grade A, and why
mcaf-devex 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.
This is a copy
89% identical to dotnet-mcaf-devex — 25 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 99 lines — stays where its author put it; the contents beside it link to each section on GitHub.
MCAF: Developer Experience
Trigger On
- the repo is hard to run, test, debug, or onboard into
- local setup differs too much across contributors
- the inner loop is slow or undocumented
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
- production deployment or pipeline policy
- pure documentation cleanup with no developer workflow impact
Inputs
- the current local setup and first-run path
- actual build, run, debug, and test commands
- pain points in onboarding or the inner loop
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
- Find the slowest or most fragile part of the inner loop:
- clone and setup
- build
- run and debug
- test
- Standardize tasks before optimizing them.
- Prefer one documented way to run the full solution locally.
- Pull only the references that match the local-dev problem you are fixing.
Deliver
- lower-friction local workflow
- better onboarding
- reproducible build, run, test, and debug paths
Validate
- a newcomer can follow the docs without hidden setup knowledge
- the inner loop is explicit and reproducible
- cross-platform or containerized guidance is used only where it helps
- local development uses real services, containers, or sandbox environments instead of fakes or stubs
Ralph Loop
Use the Ralph Loop for every task, including docs, architecture, testing, and tooling work.
- Plan first (mandatory):
- analyze current state
- define target outcome, constraints, and risks
- write a detailed execution plan
- list final validation skills to run at the end, with order and reason
- Execute one planned step and produce a concrete delta.
- Review the result and capture findings with actionable next fixes.
- Apply fixes in small batches and rerun the relevant checks or review steps.
- Update the plan after each iteration.
- Repeat until outcomes are acceptable or only explicit exceptions remain.
- If a dependency is missing, bootstrap it or return
status: not_applicablewith explicit reason and fallback path.
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.
- 1mo ago First seen · 99 lines · 49 tokens per session scan A a495662cf6e2
mcaf-devex is a skill published in the GitHub repository managedcode/MCPGateway (5 stars, last pushed 8d ago), licensed MIT. It adds 49 tokens to every session and 793 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 89% identical to dotnet-mcaf-devex, differing in 25 lines, and is treated as a copy.
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