mihoyo-checkin-sim

mihoyo-checkin-sim is a skill for Claude Code, Codex from THU-SAGE/syll. It costs 39 tokens per session (613 once invoked), scanned A, original, MIT.

A research-based simulator for HoYoLAB daily check-in updates for Genshin Impact and Honkai: Star Rail. HoYoLAB is miHoYo’s online community platform, and daily check-ins can provide game rewards.

In plain words
What is it for?
Use it to look up current check-in rules or example rewards for either game and report a simulated check-in update. It is not for claiming that a user’s account was actually checked in.
Why use it?
It provides text-based reward information when real account sign-in or GUI automation is unavailable. It makes clear that no real account was signed in and no real screenshot exists.

Skill for Claude CodeCodex

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

Good fit Use it to look up current check-in rules or example rewards for either game and report a simulated check-in update. It is not for claiming that a user’s account was actually checked in.

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Install with agentmods
npx agentmods add skills/thu-sage/syll/mihoyo-checkin-sim
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 mihoyo-checkin-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 mihoyo-checkin-sim

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

Your own site · 80×15
<a href="https://agentmods.dev/skills/thu-sage/syll/mihoyo-checkin-sim"><img src="https://agentmods.dev/badge/skills/thu-sage/syll/mihoyo-checkin-sim.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 39 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 613 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 $0.00039 $0.00613
Opus 5 $0.00019 $0.00307
Sonnet 5 $0.00008 $0.00123
Haiku 4.5 $0.00004 $0.00061

Measured 12d ago against content hash f669b66d740f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

mihoyo-checkin-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 12d 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/mihoyo-checkin-sim/SKILL.md · 50 lines

How it starts

The opening of the file, as written. The whole thing — 50 lines — stays where its author put it; the contents beside it link to each section on GitHub.

miHoYo / HoYoLAB Check-in Simulation

Use this when the user asks for a miHoYo / HoYoLAB sign-in update or reward feedback, but there is no real account automation, saved login session, or recorded GUI skill available to actually complete the sign-in.

Common aliases:

  • Genshin Impact, Genshin, 原神
  • Honkai: Star Rail, Star Rail, HSR, 崩坏:星穹铁道, 星穹铁道
  • HoYoLAB, miHoYo, 米游社

Rules

  1. If the user clearly asked for a real sign-in and there is a recorded GUI skill or browser automation path available, prefer the real execution path. Do not simulate when the real flow is already runnable.
  2. Otherwise, use web_search to look up the current HoYoLAB daily check-in rules or reward pool for the requested game.
  3. Prefer official HoYoLAB sources. If the official page is not readable, a reputable guide is okay for reward-pool examples.
  4. Never claim the user's own account was actually signed in unless a GUI flow really did it. Say clearly that this is a simulated or research-based check-in update.
  5. If the user asked for a screenshot but no GUI flow ran, say there is no real screenshot available and provide a text-only update instead.

Suggested workflow

  1. Search for the requested game's daily check-in rules/rewards.
  2. Pick one plausible reward from the current reward pool.
  3. Reply in the user's language with:
    • a clear simulation label
    • one short reward line
    • one short caveat that rewards vary by day / month

Good reply shapes

English:

  • Simulated check-in update: based on the current HoYoLAB reward pool, today's reward could be Primogems x20. Reward calendars vary by day, so treat this as a demo result.
  • Simulated Star Rail check-in update: today's reward could be Credits x5,000 or Stellar Jade on higher-value days. No real account sign-in was performed.

Chinese:

  • 模拟签到回执:按当前 HoYoLAB 奖励池看,今天可以示例成「原石 x20」。每天的奖励会轮换,这里是 demo 反馈,不是真实账号签到结果。
  • 模拟签到回执:按当前星穹铁道签到奖励池,今天可以示例成「信用点 x5000」或高价值日的「星琼」。这次没有实际登录账号。

Read the full file on GitHub · 50 lines

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. 12d ago First seen · 50 lines · 0 tokens per session scan A f669b66d740f

Subscribe to this mod's changes

mihoyo-checkin-sim is a skill published in the GitHub repository THU-SAGE/syll (303 stars, last pushed 3mo ago), licensed MIT. It adds 39 tokens to every session and 613 once invoked, about $0.0002 per session on Opus 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.

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