SekaiSync

SekaiSync is a skill for Claude Code, Codex from omoinoki/sekaisync. It costs 29 tokens per session (3,320 once invoked), scanned A, original, MIT.

A local Project Sekai fact and name database used before answering questions or creating related content. Project Sekai is a music and rhythm game, and the database covers its official master data rather than every kind of game content.

In plain words
What is it for?
Use it to resolve names and look up characters, songs, cards, events, units, and other Project Sekai metadata before drafting or checking an answer.
Why use it?
It helps avoid invented facts, incorrect localized names, and confusion between regional schedules. It also identifies information that the local database does not cover.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: reads .claude/ paths; mentions Claude Code; mentions Codex.

Good fit Use it to resolve names and look up characters, songs, cards, events, units, and other Project Sekai metadata before drafting or checking an answer.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/omoinoki/sekaisync/agents
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 omoinoki/sekaisync --skill agents
Clone the repo
git clone --depth 1 https://github.com/omoinoki/sekaisync

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 SekaiSync

README.md
[![agentmods](https://agentmods.dev/badge/skills/omoinoki/sekaisync/agents/github.svg)](https://agentmods.dev/skills/omoinoki/sekaisync/agents)
Your own site
<a href="https://agentmods.dev/skills/omoinoki/sekaisync/agents"><img src="https://agentmods.dev/badge/skills/omoinoki/sekaisync/agents/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 SekaiSync

Your own site · 80×15
<a href="https://agentmods.dev/skills/omoinoki/sekaisync/agents"><img src="https://agentmods.dev/badge/skills/omoinoki/sekaisync/agents.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 29 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,320 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 $0.00029 $0.03320
Opus 5.5 $0.00012 $0.01328
Sonnet 5.5 $0.00006 $0.00664
Haiku 4.5 $0.00003 $0.00332

Measured 14d ago against content hash db2763d154b5, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

SekaiSync 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 14d 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.

agents/SKILL.md · 92 lines

How it starts

The opening of the file, as written. The whole thing — 92 lines — stays where its author put it; the contents beside it link to each section on GitHub.

SekaiSync skill

Use this skill whenever the conversation involves Project Sekai characters, songs, cards, events, units, stories, or fan-created content.

Workflow

  1. Check sekaisync_freshness to confirm data coverage.
  2. Resolve every proper noun with sekaisync_resolve_name.
  3. Look up facts with sekaisync_lookup.
  4. Request sekaisync_fact_pack for the entity IDs the answer needs.
  5. Verify generated claims with sekaisync_verify_claims.

Output contract

  • Use only the official localized name returned by SekaiSync.
  • Do not add facts absent from the returned record.
  • Treat official role labels in character profiles as snapshots of team responsibilities, not exhaustive capability or ownership lists. A label such as lyricist does not imply inability to compose or play an instrument, or lack of ownership of one. Require explicit supporting evidence for negative claims; missing evidence is unknown, not false.
  • If there is no match, state that the local knowledge base does not cover the entity.
  • The local store covers master metadata only. Full story text, images, audio, Live2D, charts, news and player data are marked missing in freshness; return unverified for those categories.
  • Use sekaisync_web_lookup for crawled text from altsource_sv / altsource_ms. Crawling itself stays a CLI action with TOS consent.
  • Base secondary creation on fact packs and avoid redistributing copyrighted assets.

术语刮削干预

当用户要求刮削/提取用语时,沿用原来的提取命令。程序返回 review_next 后,由正在执行任务的智能体自身继续导出、阅读、判断、提交,不需要用户另配 API Key。不要把程序返回待审队列当作整个刮削任务已经完成。

任务分为 discovery(直接从原文补找分词漏掉的用语)、translation(在对应的本地译文中找实际表面形)和 occurrence(判断具体出现及语境词义,不发布全局译名)。单故事用语会自动得到出现级任务,原有两故事通用译名门槛不降低。程序提供内容寻址的任务 ID、原文/译文语句、故事和位置。已完成的任务不会因 429 或重启而重复应用;下一次 export 会轮转到其他未决项。用户无需改用新命令。

# 1. 导出待裁决队列(自包含:每条含 term/候选/证据,无需回读语料)
sekaisync terms review export --out queue.txt --limit 20

# 2. 读 queue.txt,逐条给出判断:
#    decision: accept(采纳 hint)| reject(否定)| replace(补正确译名,需填 value)
#    每条写一句语境理由 rationale;有 task_context 的任务用 generalize: null
#    discovery 沿用 terms 数组;完整出现和非连续表达可用导出契约中的 subjects

# 3. 写回
sekaisync terms review submit --file judgments.txt

# 4. 检查 errors、applied_slots、remaining,再次 export 处理后续任务

# 查看沉淀与复用率
sekaisync terms review stats
sekaisync terms review methodology

Read the full file on GitHub · 92 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. 14d ago First seen · 92 lines · 29 tokens per session scan A db2763d154b5

Subscribe to this mod's changes

SekaiSync is a skill published in the GitHub repository omoinoki/sekaisync (23 stars, last pushed 11d ago), licensed MIT. It adds 29 tokens to every session and 3,320 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 2026-10-03.

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