Manage Settings
asgeirtj/system_prompts_leaks
Any explicit Muse Code setting question or change (model, reasoning effort, /settings) requires a silent readskill call for bundled:manage-settings as FIRST ACTION—no assistant text or other tool…
Guidance for setting up mailing list servers with Postfix and Mailman3.
No licenceAuto-check passed
Install Mailman
$ npx skills add lazyFrogLOL/Harness_Engineering --skill mailman -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install lazyFrogLOL/Harness_Engineering mailman --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/lazyFrogLOL/Harness_Engineering.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/mailman .claude/skills/mailman && rm -rf skills-srcUse ~/.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/
Install the "mailman" agent skill from https://github.com/lazyFrogLOL/Harness_Engineering/tree/master/skills/mailman into .claude/skills/mailman/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mailman", 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 install https://github.com/lazyFrogLOL/Harness_Engineering/tree/master/skills/mailmanType 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.
$ npx skills add lazyFrogLOL/Harness_Engineering --skill mailman -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install lazyFrogLOL/Harness_Engineering mailman --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/lazyFrogLOL/Harness_Engineering.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/mailman .agents/skills/mailman && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "mailman" agent skill from https://github.com/lazyFrogLOL/Harness_Engineering/tree/master/skills/mailman into .agents/skills/mailman/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mailman", 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.
$ npx skills add lazyFrogLOL/Harness_Engineering --skill mailman -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install lazyFrogLOL/Harness_Engineering mailman --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/lazyFrogLOL/Harness_Engineering.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/mailman .cursor/skills/mailman && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "mailman" agent skill from https://github.com/lazyFrogLOL/Harness_Engineering/tree/master/skills/mailman into .cursor/skills/mailman/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mailman", 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 https://github.com/lazyFrogLOL/Harness_Engineering.git --path skills/mailman--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add lazyFrogLOL/Harness_Engineering --skill mailman -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install lazyFrogLOL/Harness_Engineering mailman --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/lazyFrogLOL/Harness_Engineering.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/mailman .gemini/skills/mailman && rm -rf skills-srcUse ~/.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/
Install the "mailman" agent skill from https://github.com/lazyFrogLOL/Harness_Engineering/tree/master/skills/mailman into .gemini/skills/mailman/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mailman", 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.
$ gh skill install lazyFrogLOL/Harness_Engineering mailmanInstalls 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).
$ npx skills add lazyFrogLOL/Harness_Engineering --skill mailman -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/lazyFrogLOL/Harness_Engineering.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/mailman .github/skills/mailman && rm -rf skills-srcUse ~/.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/
Install the "mailman" agent skill from https://github.com/lazyFrogLOL/Harness_Engineering/tree/master/skills/mailman into .github/skills/mailman/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mailman", 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.
$ npx skills add lazyFrogLOL/Harness_Engineering --skill mailman -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install lazyFrogLOL/Harness_Engineering mailman --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/lazyFrogLOL/Harness_Engineering.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/mailman .opencode/skills/mailman && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "mailman" agent skill from https://github.com/lazyFrogLOL/Harness_Engineering/tree/master/skills/mailman into .opencode/skills/mailman/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mailman", 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
mailman- GitHub stars
- 128
- Token cost
- ~1.5k tokens
- SKILL.md length
- 636 words
- Files
- 1
- Skills in repo
- 32
- Repo updated
- First seen
- Licence
- None found
At a glance
Guidance for setting up mailing list servers with Postfix and Mailman3.
- Works in 9 steps: Documentation Review → Configuration Architecture → Implementation Order → …
- SKILL.md covers Overview, Approach, Verification Strategies and Common Pitfalls, plus 3 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Mailman is an agent skill from lazyFrogLOL/Harness_Engineering. Guidance for setting up mailing list servers with Postfix and Mailman3. This skill should be used when configuring email infrastructure, integrating Mailman3 with Postfix MTA, creating mailing lists, or troubleshooting mail delivery issues.
Its SKILL.md is about 1.5k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
Example prompts
- “/mailman”
Workflow steps
9 steps, taken from the step headings in SKILL.md.
- Documentation Review
- Configuration Architecture
- Implementation Order
- Empty Alias/Transport Files
- Custom Transport Instead of Native Integration
- List Creation Not Persisting
- Malformed Configuration Sections
- LMTP Port Mismatch
- Missing Automatic Synchronization
What it can do on your machine
Read from SKILL.md and the folder at commit cae3b25. 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
Mailman loads about 1.5k tokens when it runs. Until then it costs about 62 tokens; SKILL.md has 636 words of instructions outside code blocks.
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
Without a licence we can't republish the file, so here is its outline and opening line. It has 636 words (~1,468 tokens).
“This skill provides guidance for setting up and configuring mailing list servers using Postfix (MTA) and Mailman3. It covers proper integration patterns, configuration best practices, and verification strategies to avoid common pitfalls.”
- name
- mailman
Files
Just SKILL.md in skills/mailman of lazyFrogLOL/Harness_Engineering.
Open the folder on GitHubat commit cae3b25
Compare with similar skills
Mailman 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Mailman this skilllazyFrogLOL/Harness_Engineering | 128 | — | ~1.5k | Automated safety check: Pass | None | |
| Manage Settingsasgeirtj/system_prompts_leaks | 69k | — | ~3.1k | Automated safety check: Pass | CC0-1.0 | |
| Warp Settings Editorwarpdotdev/warp | 65k | 1 repos | ~675 | Automated safety check: Pass | AGPL-3.0 | |
| Mails So AutomationComposioHQ/awesome-claude-skills | 77k | 3 repos | ~734 | Automated safety check: Pass | None | |
| Warp Settings Page Builderwarpdotdev/warp | 65k | 1 repos | ~4.5k | Automated safety check: Pass | AGPL-3.0 | |
| Add Server Env Var for User Settinglobehub/lobehub | 83k | — | ~644 | Automated safety check: Pass | Custom licence |
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How to build a settings page in the Warp desktop client so widgets, page titles and settings search behave correctly, and which common mistakes to avoid.
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Questions about Mailman
What does Mailman do?
Guidance for setting up mailing list servers with Postfix and Mailman3. Mailman is an agent skill from lazyFrogLOL/Harness_Engineering. Guidance for setting up mailing list servers with Postfix and Mailman3.
How do I install Mailman in Claude Code?
Run `npx skills add lazyFrogLOL/Harness_Engineering --skill mailman -a claude-code`. Or copy the skill folder (skills/mailman in lazyFrogLOL/Harness_Engineering) into .claude/skills/mailman in your project. Claude Code loads it when a task matches its description.
How do I install Mailman in Codex?
Run `npx skills add lazyFrogLOL/Harness_Engineering --skill mailman -a codex`. Or copy the skill folder (skills/mailman in lazyFrogLOL/Harness_Engineering) into .agents/skills/mailman in your project. Codex loads it when a task matches its description.
Can I use Mailman 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 lazyFrogLOL/Harness_Engineering --skill mailman -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/mailman, .gemini/skills/mailman, .github/skills/mailman and .opencode/skills/mailman in your project.
What does Mailman need to run?
SKILL.md names no scripts, command-line tools or credentials: Mailman is instructions for the agent only.
Does Mailman 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 Mailman 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 Mailman use?
No licence was found for Mailman or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Mailman use?
About 1.5k tokens (SKILL.md is roughly 5.9k 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 Mailman?
Skills that share tags, products or a category with Mailman: Manage Settings (asgeirtj/system_prompts_leaks, 69k stars), Warp Settings Editor (warpdotdev/warp, 65k stars), Mails So Automation (ComposioHQ/awesome-claude-skills, 77k stars) and Warp Settings Page Builder (warpdotdev/warp, 65k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Mailman?
lazyFrogLOL (a GitHub user) maintains it in lazyFrogLOL/Harness_Engineering, which has 128 GitHub stars. The repository holds 32 skills in this directory. The repository was last updated on May 18, 2026.
Source: lazyFrogLOL/Harness_Engineering on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.