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Agent skill

Local Mail Sim

by THU-SAGE in THU-SAGE/syll

Simulate an overnight local mail summary when there is no real local mailbox integration or recorded GUI workflow available.

MITAuto-check passedMedia & Creative

Install Local Mail Sim

skills CLI
$ npx skills add THU-SAGE/syll --skill local-mail-sim -a claude-code

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

GitHub CLI
$ gh skill install THU-SAGE/syll local-mail-sim --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/THU-SAGE/syll.git skills-src && mkdir -p .claude/skills && cp -r skills-src/syll/skills/local-mail-sim .claude/skills/local-mail-sim && 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/

Facts

Skill name
local-mail-sim
GitHub stars
303
Token cost
~355 tokens
SKILL.md length
183 words
Files
1
Skills in repo
8
Repo updated
First seen
Licence
MIT

At a glance

Simulate an overnight local mail summary when there is no real local mailbox integration or recorded GUI workflow available.

  • Works in 5 steps: If a real local-mail GUI workflow… → Otherwise, generate a simulated… → Never claim a real inbox was opened… → …
  • Media & Creative work in your project
  • SKILL.md covers Rules, Suggested mock bundle and Good reply shapes
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Local Mail Sim is an agent skill from THU-SAGE/syll. Simulate an overnight local mail summary when there is no real local mailbox integration or recorded GUI workflow available.

Its SKILL.md is about 360 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Media & Creative. The repository describes itself as: [New] Syll is a self-hosted companion runtime with a web UI, chat channels, proactive rituals, editable markdown skills, recorded workflows, and a desktop ghost. The licence is MIT.

When your agent uses it

  • Media & Creative work in your project

Example prompts

  • “/local-mail-sim”

Workflow steps

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

  1. If a real local-mail GUI workflow exists, prefer the real path.
  2. Otherwise, generate a simulated overnight mail summary.
  3. Never claim a real inbox was opened unless it actually was.
  4. If no real GUI path ran, do not claim there is a screenshot.
  5. Keep the summary compact

What it can do on your machine

Read from SKILL.md and the folder at commit 3741347. 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

Local Mail Sim loads about 355 tokens when it runs. Until then it costs about 35 tokens; SKILL.md has 183 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~35
When it runs · the whole SKILL.md, loaded when a task matches
~355

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 THU-SAGE/syll at commit 3741347, republished under its MIT licence (© THU-SAGE). 183 words, ~355 tokens.

Download SKILL.mdSave it as .claude/skills/local-mail-sim/SKILL.md (or your agent's skills folder).
name
local-mail-sim
description
Simulate an overnight local mail summary when there is no real local mailbox integration or recorded GUI workflow available.

Local Mail Simulation

Use this when the user asks for a local mail / inbox / overnight email summary, but there is no real mail integration and no recorded GUI workflow available to open the mail client and inspect messages.

Common aliases:

  • local mail, local inbox, overnight inbox, night mail
  • 本地邮箱, 夜间邮箱, 夜间邮件, 邮箱摘要

Rules

  1. If a real local-mail GUI workflow exists, prefer the real path.
  2. Otherwise, generate a simulated overnight mail summary.
  3. Never claim a real inbox was opened unless it actually was.
  4. If no real GUI path ran, do not claim there is a screenshot.
  5. Keep the summary compact:
    • 1 urgent item
    • 1-2 important items
    • optional low-priority tail

Suggested mock bundle

  • Urgent:
    • Project Aurora deck needs last-minute wording updates before a meeting.
  • Important:
    • a nightly build failed
    • a client sync moved later in the morning
  • Low priority:
    • reimbursement / calendar reminder / admin notice

Good reply shapes

English:

  • Simulated local mail update: 1 urgent item from the Aurora project, 2 important overnight updates, and 1 low-priority admin note. No real mailbox was accessed.

Chinese:

  • 模拟夜间邮箱回执：昨晚可以示例成 1 条紧急、2 条重要更新和 1 条低优先级通知。这次没有实际读取本地邮箱。

© THU-SAGE, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in syll/skills/local-mail-sim of THU-SAGE/syll.

Open the folder on GitHubat commit 3741347

Compare with similar skills

Local Mail Sim 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.

Local Mail Sim compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Local Mail Sim this skillTHU-SAGE/syll303—~355Automated safety check: PassMIT
Guizang Social Cardsop7418/guizang-social-card-skill7.4k1 repos~7.8kAutomated safety check: PassAGPL-3.0
Weekly Changelog Videoheygen-com/hyperframes59k—~3.3kAutomated safety check: PassApache-2.0
Anthropic Brand Stylinganthropics/skills180k30 repos~559Automated safety check: PassApache-2.0
MoneyPrinterTurbo Video Generatorharry0703/MoneyPrinterTurbo129k—~2.1kAutomated safety check: WarnMIT
Brag Slim Launch Video Makerlatent-spaces/brag14k1 repos~1.9kAutomated safety check: PassMIT

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Categories

Questions about Local Mail Sim

What does Local Mail Sim do?

Simulate an overnight local mail summary when there is no real local mailbox integration or recorded GUI workflow available. Local Mail Sim is an agent skill from THU-SAGE/syll. Simulate an overnight local mail summary when there is no real local mailbox integration or recorded GUI workflow available.

When should I use Local Mail Sim?

Local Mail Sim fits situations like: media & Creative work in your project.

How do I install Local Mail Sim in Claude Code?

Run `npx skills add THU-SAGE/syll --skill local-mail-sim -a claude-code`. Or copy the skill folder (syll/skills/local-mail-sim in THU-SAGE/syll) into .claude/skills/local-mail-sim in your project. Claude Code loads it when a task matches its description.

How do I install Local Mail Sim in Codex?

Run `npx skills add THU-SAGE/syll --skill local-mail-sim -a codex`. Or copy the skill folder (syll/skills/local-mail-sim in THU-SAGE/syll) into .agents/skills/local-mail-sim in your project. Codex loads it when a task matches its description.

Can I use Local Mail Sim 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 THU-SAGE/syll --skill local-mail-sim -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/local-mail-sim, .gemini/skills/local-mail-sim, .github/skills/local-mail-sim and .opencode/skills/local-mail-sim in your project.

What does Local Mail Sim need to run?

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

Does Local Mail Sim 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 Local Mail Sim 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 Local Mail Sim use?

Local Mail Sim 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 Local Mail Sim use?

About 355 tokens (SKILL.md is roughly 1.4k 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 Local Mail Sim?

Skills that share tags, products or a category with Local Mail Sim: Guizang Social Cards (op7418/guizang-social-card-skill, 7.4k stars), Weekly Changelog Video (heygen-com/hyperframes, 59k stars), Anthropic Brand Styling (anthropics/skills, 180k stars) and MoneyPrinterTurbo Video Generator (harry0703/MoneyPrinterTurbo, 129k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Local Mail Sim?

THU-SAGE (a GitHub organization) maintains it in THU-SAGE/syll, which has 303 GitHub stars. The repository holds 8 skills in this directory. The repository was last updated on June 9, 2026.

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