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MCPGateway: Skill for Codex

.codex/skills/mcaf-dotnet-codeql/SKILL.md

mcaf-dotnet-codeql is a skill for Codex from managedcode/MCPGateway. It costs 53 tokens per session (876 once invoked), scanned A, a copy of codeql, MIT.

A guide for using CodeQL, an open-source tool that analyzes source code for security problems, in .NET projects. It covers query packs, command-line analysis, and GitHub code-scanning setup, including private-repository licensing concerns.

In plain words
What is it for?
Use it to plan CodeQL checks, configure GitHub Actions, run analysis from the command line, or choose manual build analysis for compiled .NET code.
Why use it?
It helps teams add security analysis without confusing it with code formatting or overlooking how repository hosting affects its use.

Skill for Codex

Written for Codex: installed under .codex/. Also seen: mentions AGENTS.md.

This is managedcode/MCPGateway's own configuration. It tells Codex how to work on MCPGateway 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 MCPGateway configures →

not rated 5repo yesterday A scan 53 tokens copy · 89% MIT
View source ↗ managedcode/MCPGateway
Reuse

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.

Copy the file
curl -O https://raw.githubusercontent.com/managedcode/MCPGateway/main/.codex/skills/mcaf-dotnet-codeql/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/managedcode/MCPGateway

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.

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README.md
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Your own site
<a href="https://agentmods.dev/skills/managedcode/mcpgateway/mcaf-dotnet-codeql"><img src="https://agentmods.dev/badge/skills/managedcode/mcpgateway/mcaf-dotnet-codeql/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.

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Your own site · 80×15
<a href="https://agentmods.dev/skills/managedcode/mcpgateway/mcaf-dotnet-codeql"><img src="https://agentmods.dev/badge/skills/managedcode/mcpgateway/mcaf-dotnet-codeql.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 53 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 876 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 89% copy Near-identical to another mod 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 $0.00053 $0.00876
Opus 5.5 $0.00021 $0.00350
Sonnet 5.5 $0.00011 $0.00175
Haiku 4.5 $0.00005 $0.00088

Measured 1mo ago against content hash 5954a21ac43a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mcaf-dotnet-codeql 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

This is a copy

89% identical to codeql — 10 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.

.codex/skills/mcaf-dotnet-codeql/SKILL.md · 101 lines

How it starts

The opening of the file, as written. The whole thing — 101 lines — stays where its author put it; the contents beside it link to each section on GitHub.

MCAF: .NET CodeQL

Trigger On

  • the repo uses or wants CodeQL for .NET security analysis
  • GitHub code scanning is part of the CI plan

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

  • teams that need a tool with no private-repo licensing caveat

Inputs

  • the nearest AGENTS.md
  • hosting model: open-source repo, private repo, or manual CLI workflow
  • current GitHub Actions workflow

Quick Start

  1. Read the nearest AGENTS.md and confirm scope and constraints.
  2. Run this skill's Workflow through the Ralph Loop until outcomes are acceptable.
  3. Return the Required Result Format with concrete artifacts and verification evidence.

Workflow

  1. Treat CodeQL as a security-analysis tool, not as a style checker.
  2. Make the licensing and hosting model explicit before proposing it as the default gate.
  3. Prefer manual build mode for compiled .NET projects when precision matters.

Bootstrap When Missing

If CodeQL is not configured yet:

  1. Detect current state:
    • rg -n "codeql-action|security-events|CodeQL" .github/workflows
    • command -v codeql
  2. Prefer CI-first setup for repository scanning using github/codeql-action/init and github/codeql-action/analyze.
  3. Configure explicit .NET build mode in workflow (manual when precision matters).
  4. Add local CLI usage only when the task requires local query work.
  5. Run the workflow or local analyze path and return status: configured or status: improved.
  6. If licensing or hosting constraints reject CodeQL for this repo, return status: not_applicable with caveat documented.

Deliver

  • explicit CodeQL setup or an explicit rejection with caveat documented
  • reproducible CI or local commands for running CodeQL in this repo

Validate

  • the chosen CodeQL path is allowed for the repo type
  • build mode is documented and reproducible

Read the full file on GitHub · 101 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.

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. 1mo ago First seen · 101 lines · 53 tokens per session scan A 5954a21ac43a

Subscribe to this mod's changes

mcaf-dotnet-codeql is a skill published in the GitHub repository managedcode/MCPGateway (5 stars, last pushed yesterday), licensed MIT. It adds 53 tokens to every session and 876 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 codeql, differing in 10 lines, and is treated as a copy.

C# and .NETLanguagesSecurityai-extensionsdotnetembeddingsmcpmcp-gateway
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