Agent skill

Doublecheck

Thorough review and verification of all code changes. An agent skill from YodasMyDad/ZauberCMS.

MITAuto-check passed

Install Doublecheck

skills CLI

$ npx skills add YodasMyDad/ZauberCMS --skill doublecheck -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install YodasMyDad/ZauberCMS doublecheck --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/YodasMyDad/ZauberCMS.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/doublecheck .claude/skills/doublecheck && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "doublecheck" agent skill from https://github.com/YodasMyDad/ZauberCMS/tree/main-static/.claude/skills/doublecheck into .claude/skills/doublecheck/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "doublecheck", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/YodasMyDad/ZauberCMS/tree/main-static/.claude/skills/doublecheck

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add YodasMyDad/ZauberCMS --skill doublecheck -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install YodasMyDad/ZauberCMS doublecheck --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/YodasMyDad/ZauberCMS.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/doublecheck .agents/skills/doublecheck && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "doublecheck" agent skill from https://github.com/YodasMyDad/ZauberCMS/tree/main-static/.claude/skills/doublecheck into .agents/skills/doublecheck/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "doublecheck", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add YodasMyDad/ZauberCMS --skill doublecheck -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install YodasMyDad/ZauberCMS doublecheck --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/YodasMyDad/ZauberCMS.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/doublecheck .cursor/skills/doublecheck && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "doublecheck" agent skill from https://github.com/YodasMyDad/ZauberCMS/tree/main-static/.claude/skills/doublecheck into .cursor/skills/doublecheck/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "doublecheck", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/YodasMyDad/ZauberCMS.git --path .claude/skills/doublecheck

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add YodasMyDad/ZauberCMS --skill doublecheck -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install YodasMyDad/ZauberCMS doublecheck --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/YodasMyDad/ZauberCMS.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/doublecheck .gemini/skills/doublecheck && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "doublecheck" agent skill from https://github.com/YodasMyDad/ZauberCMS/tree/main-static/.claude/skills/doublecheck into .gemini/skills/doublecheck/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "doublecheck", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install YodasMyDad/ZauberCMS doublecheck

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add YodasMyDad/ZauberCMS --skill doublecheck -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/YodasMyDad/ZauberCMS.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/doublecheck .github/skills/doublecheck && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "doublecheck" agent skill from https://github.com/YodasMyDad/ZauberCMS/tree/main-static/.claude/skills/doublecheck into .github/skills/doublecheck/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "doublecheck", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add YodasMyDad/ZauberCMS --skill doublecheck -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install YodasMyDad/ZauberCMS doublecheck --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/YodasMyDad/ZauberCMS.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/doublecheck .opencode/skills/doublecheck && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "doublecheck" agent skill from https://github.com/YodasMyDad/ZauberCMS/tree/main-static/.claude/skills/doublecheck into .opencode/skills/doublecheck/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "doublecheck", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: doublecheck
GitHub stars: 112
Token cost: ~383 tokens
SKILL.md length: 159 words
Files: 1
Skills in repo: 1
Repo updated: May 8, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Thorough review and verification of all code changes. An agent skill from YodasMyDad/ZauberCMS.

Works in 5 steps: Trace through every change: Re-read each… → Verify completeness: Compare what was… → Check for bugs and issues → …
The user says /doublecheck
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
Review your work

What it does

Doublecheck is an agent skill from YodasMyDad/ZauberCMS. Thorough review and verification of all code changes. Use when the user says /doublecheck, 'double check', 'review your work', 'verify changes', or asks to make sure nothing was missed after a set of code changes. Traces through all modifications, validates correctness, checks for bugs, and builds the solution.

Its SKILL.md is about 380 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It works with Blazor and .NET. The repository describes itself as: .NET CMS using Blazor, built by .Net Developers for .Net Developers. The licence is MIT.

When your agent uses it

The user says /doublecheck
Review your work
Asks to make sure nothing was missed after a set of code changes

Example prompts

“double check”
“review your work”
“verify changes”
“/doublecheck”

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

Trace through every change: Re-read each modified file. Walk through the logic path from entry point to exit for every change. Confirm…
Verify completeness: Compare what was requested against what was implemented. Flag anything missing or incomplete.
Check for bugs and issues
Check for linter errors and warnings: Review code style, unused imports, unused variables, naming conventions, and any compiler warnings…
Build the solution: Run the build once all changes are finalized. Fix any errors or warnings that appear.

What it can do on your machine

Read from SKILL.md and the folder at commit 3eb5cb7. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Doublecheck loads about 383 tokens when it runs. Until then it costs about 81 tokens; SKILL.md has 159 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~81
When it runs · the whole SKILL.md, loaded when a task matches: ~383

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from YodasMyDad/ZauberCMS at commit 3eb5cb7, republished under its MIT licence (© YodasMyDad). 159 words, ~383 tokens.

Download SKILL.mdSave it as .claude/skills/doublecheck/SKILL.md (or your agent's skills folder).

name: doublecheck
description: Thorough review and verification of all code changes. Use when the user says /doublecheck, 'double check', 'review your work', 'verify changes', or asks to make sure nothing was missed after a set of code changes. Traces through all modifications, validates correctness, checks for bugs, and builds the solution.

Double Check

Thoroughly review and verify all code changes made in this session.

Process

Trace through every change: Re-read each modified file. Walk through the logic path from entry point to exit for every change. Confirm each change matches the original request.
Verify completeness: Compare what was requested against what was implemented. Flag anything missing or incomplete.
Check for bugs and issues:
- Thread safety problems (shared mutable state, race conditions)
- Memory leaks (undisposed resources, event handler leaks, missing using statements)
- Async issues (missing await, deadlocks, fire-and-forget without error handling)
- Performance issues (N+1 queries, unnecessary allocations, blocking calls in async paths)
- Null reference risks
- Off-by-one errors
- Error handling gaps
Check for linter errors and warnings: Review code style, unused imports, unused variables, naming conventions, and any compiler warnings. Fix any found issues whether pre-existing or newly introduced.
Build the solution: Run the build once all changes are finalized. Fix any errors or warnings that appear.

Files

Just SKILL.md in .claude/skills/doublecheck of YodasMyDad/ZauberCMS.

Open the folder on GitHubat commit 3eb5cb7

Compare with similar skills

Doublecheck next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Doublecheck compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Doublecheck this skillYodasMyDad/ZauberCMS	112	—	~383	Automated safety check: Pass	MIT	5 mo ago
Aspnet Corefanslead/ReverseProxy.Store	163	2 repos	~1.4k	Automated safety check: Pass	Apache-2.0	1 mo ago
Maui AI DebuggingRedth/Maui.Gtk	101	—	~4.1k	Automated safety check: Pass	MIT	5 mo ago
Test Firstdeanhume/html-minifier	142	—	~876	Automated safety check: Pass	MIT	yesterday
QA TesterJocysCom/FocusLogger	213	—	~12k	Automated safety check: Pass	GPL-3.0	3 mo ago
Maui Hot Reload Diagnosticsdavidortinau/maui-skills	174	—	~1.3k	Automated safety check: Pass	MIT	3 mo ago

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Works with

Questions about Doublecheck

What does Doublecheck do?

Thorough review and verification of all code changes. An agent skill from YodasMyDad/ZauberCMS. Doublecheck is an agent skill from YodasMyDad/ZauberCMS. Thorough review and verification of all code changes.

When should I use Doublecheck?

Doublecheck fits situations like: the user says /doublecheck; review your work; asks to make sure nothing was missed after a set of code changes.

How do I install Doublecheck in Claude Code?

Run `npx skills add YodasMyDad/ZauberCMS --skill doublecheck -a claude-code`. Or copy the skill folder (.claude/skills/doublecheck in YodasMyDad/ZauberCMS) into .claude/skills/doublecheck in your project. Claude Code loads it when a task matches its description.

How do I install Doublecheck in Codex?

Run `npx skills add YodasMyDad/ZauberCMS --skill doublecheck -a codex`. Or copy the skill folder (.claude/skills/doublecheck in YodasMyDad/ZauberCMS) into .agents/skills/doublecheck in your project. Codex loads it when a task matches its description.

Can I use Doublecheck in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add YodasMyDad/ZauberCMS --skill doublecheck -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/doublecheck, .gemini/skills/doublecheck, .github/skills/doublecheck and .opencode/skills/doublecheck in your project.

What does Doublecheck need to run?

SKILL.md names no scripts, command-line tools or credentials: Doublecheck is instructions for the agent only.

Does Doublecheck access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Doublecheck safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Doublecheck use?

Doublecheck is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Doublecheck use?

About 383 tokens (SKILL.md is roughly 1.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Doublecheck?

Skills that share tags, products or a category with Doublecheck: Aspnet Core (fanslead/ReverseProxy.Store, 163 stars), Maui AI Debugging (Redth/Maui.Gtk, 101 stars), Test First (deanhume/html-minifier, 142 stars) and QA Tester (JocysCom/FocusLogger, 213 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Doublecheck?

YodasMyDad (a GitHub user) maintains it in YodasMyDad/ZauberCMS, which has 112 GitHub stars. The repository was last updated on May 8, 2026.

Source: YodasMyDad/ZauberCMS on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Doublecheck

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Double Check

Process

Files

Compare with similar skills

Similar skills

Aspnet Core

Maui AI Debugging

Test First

QA Tester

Maui Hot Reload Diagnostics

Dotnet10 Features

Related

Questions about Doublecheck