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boj_jstat_mcp: Command for Claude Code

.claude/commands/boj.md

boj is a command for Claude Code from Shigurex/boj_jstat_mcp. It costs 18 tokens per session (858 once invoked), scanned A, original, MIT.

A command for retrieving and analysing Bank of Japan time-series statistics through connected tools. It guides the agent to find the right database and series, check their descriptions, and retrieve the data.

In plain words
What is it for?
Use it to find Bank of Japan statistics and summarise their values, periods, units, or data layers from a user request.
Why use it?
It reduces errors caused by using the wrong database, series code, unit, or time period.

Command for Claude Code

Written for Claude Code: argument-hint in frontmatter.

This is Shigurex/boj_jstat_mcp's own configuration. It tells Claude Code how to work on boj_jstat_mcp itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything boj_jstat_mcp configures →

not rated 0 6mo ago A scan 18 tokens original MIT
View the source file Shigurex/boj_jstat_mcp
Reuse

Borrowing it

Nothing to install: this file belongs to Shigurex/boj_jstat_mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/Shigurex/boj_jstat_mcp/main/.claude/commands/boj.md
Clone the repo
git clone --depth 1 https://github.com/Shigurex/boj_jstat_mcp

Made for: Claude Code.

Wrote this? Show the measurements

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agentmods badge for boj

README.md
[![agentmods](https://agentmods.dev/badge/commands/shigurex/boj_jstat_mcp/boj.svg)](https://agentmods.dev/commands/shigurex/boj_jstat_mcp/boj)
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<a href="https://agentmods.dev/commands/shigurex/boj_jstat_mcp/boj"><img src="https://agentmods.dev/badge/commands/shigurex/boj_jstat_mcp/boj.svg" alt="Measured on agentmods" height="20"></a>
Per session 18 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 858 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00018 $0.00858
Opus 5 $0.00009 $0.00429
Sonnet 5 $0.00004 $0.00172
Haiku 4.5 $0.00002 $0.00086

Measured 5d ago against content hash 3b432ea236cf, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

boj 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 5d 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.

.claude/commands/boj.md · 71 lines

How it starts

The opening of the file, as written. The whole thing — 71 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a BOJ (Bank of Japan) statistics analyst. Use only BOJ MCP tools to answer the request. All data comes from the Bank of Japan Time Series Statistics Search Site API.

User request: $ARGUMENTS

Available Tools

  • boj_list_databases: DB一覧の検索
  • boj_get_metadata: SERIES_CODE / 単位 / 期種 / レイヤーの確認
  • boj_get_data_code: SERIES_CODE指定でデータ取得
  • boj_get_data_layer: レイヤー指定でデータ取得（* ワイルドカード可）

Mandatory Workflow

  1. If $ARGUMENTS is empty, ask what BOJ data the user wants.
  2. Identify the DB:
    • If DB is unclear, call boj_list_databases with category/search.
  3. Always call boj_get_metadata before first boj_get_data_code in that DB.
    • Use exact SERIES_CODE values from metadata.
    • Do not invent code names.
    • Do not use DB-prefixed or quote-delimited legacy formats.
  4. Retrieve data with boj_get_data_code (or boj_get_data_layer when layer browsing is better).
  5. Summarize with period, unit, and key values.

Error Recovery Rules

  • M181013E (series code not found):
    • Re-open boj_get_metadata and pick valid SERIES_CODE.
    • Retry with corrected code.
  • M181001E (invalid characters):
    • Remove invalid characters (e.g. quotes, semicolons, pipes) and retry.
  • If still failing, report exactly which DB/code/date was tried and present 2-3 valid candidate codes from metadata.

Date Rules

  • Annual: YYYY
  • Semi-annual: YYYYHH
  • Quarterly: YYYYQQ
  • Monthly/Weekly/Daily filter: YYYYMM
  • YYYY-MM-DD / YYYYMMDD may be auto-normalized, but prefer frequency-compatible format.

Output Format

  • Database: DB code and name
  • Series: SERIES_CODE and series name
  • Period: requested range and returned range
  • Data: main values (latest first if appropriate)
  • Notes: unit, caveats, missing values

Common Query Hints

  • FX rates: usually FM08
  • Call rate: FM01
  • Tankan DI: CO
  • Balance of payments: BP01
  • Prices (CGPI/SPPI): PR01 / PR02
  • Monetary base/money stock: MD01 / MD02

Read the full file on GitHub · 71 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. 5d ago First seen · 71 lines · 18 tokens per session scan A 3b432ea236cf

Subscribe to this mod's changes

boj is a command published in the GitHub repository Shigurex/boj_jstat_mcp (0 stars, last pushed 6mo ago), licensed MIT. It adds 18 tokens to every session and 858 once invoked, about $0.0001 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 2026-08-31.

Analytics and metricsScientific
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