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local-mail-sim

local-mail-sim is a skill for Claude Code, Codex from THU-SAGE/syll. It costs 26 tokens per session (365 once invoked), scanned A, original, MIT.

A fallback that creates a clearly labeled mock overnight email summary when no real mailbox or mail-client workflow is available.

In plain words
What is it for?
It is for simulating local inbox, overnight email, or night-mail updates with urgent, important, and optional low-priority items.
Why use it?
It provides a useful summary format without pretending that an inbox was opened or that real messages were read.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 304repo 5mo ago A scan 26 tokens original MIT

Good fit It is for simulating local inbox, overnight email, or night-mail updates with urgent, important, and optional low-priority items.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/thu-sage/syll/local-mail-sim
View source ↗ THU-SAGE/syll thu-sage.github.io
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add THU-SAGE/syll --skill local-mail-sim
Clone the repo
git clone --depth 1 https://github.com/THU-SAGE/syll

Made for: Claude Code, 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.

agentmods badge for local-mail-sim

README.md
[![agentmods](https://agentmods.dev/badge/skills/thu-sage/syll/local-mail-sim/github.svg)](https://agentmods.dev/skills/thu-sage/syll/local-mail-sim)
Your own site
<a href="https://agentmods.dev/skills/thu-sage/syll/local-mail-sim"><img src="https://agentmods.dev/badge/skills/thu-sage/syll/local-mail-sim/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.

agentmods 80×15 button for local-mail-sim

Your own site · 80×15
<a href="https://agentmods.dev/skills/thu-sage/syll/local-mail-sim"><img src="https://agentmods.dev/badge/skills/thu-sage/syll/local-mail-sim.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 26 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 365 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 original No closer match found 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 $0.00026 $0.00365
Opus 5.5 $0.00010 $0.00146
Sonnet 5.5 $0.00005 $0.00073
Haiku 4.5 $0.00003 $0.00036

Measured 2mo ago against content hash 63cacbc9f9da, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

local-mail-sim 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 2mo 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.

syll/skills/local-mail-sim/SKILL.md · 44 lines

What it actually says

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。
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. 2mo ago First seen · 44 lines · 26 tokens per session scan A 63cacbc9f9da

Subscribe to this mod's changes

local-mail-sim is a skill published in the GitHub repository THU-SAGE/syll (304 stars, last pushed 5mo ago), licensed MIT. It adds 26 tokens to every session and 365 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Productivity
Related

local-mail-sim compared with skills from other repositories

local-mail-sim next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
local-mail-simTHU-SAGE/syllSkill3045mo agoMITA26Claude Code, Codex
orbit-notionnexu-io/open-designSkill106kyesterdayApache-2.0A117Claude Code, Codex
agentmailpaperclipai/paperclipSkill111kyesterdayMITA30Claude Code, Codex
Cortexdanielmiessler/LifeOSSkill20kyesterdayMITA184Claude Code
rowboat-spacesrowboatlabs/rowboatSkill18kyesterdayApache-2.0A60Claude Code, Codex
feishuHmbown/CodeWhaleSkill41k5d agoMITA33Claude Code, Codex
pinchtab-mcppinchtab/pinchtabSkill11k10d agoMITA52Claude Code, Codex