What is gahmen-mcp CLAUDE.md?

Repository instructions for working on gahmen-mcp, a server that lets AI tools access Singapore’s government data APIs through a common connection standard.

Use it when developing, checking, formatting, building, or preparing gahmen-mcp for Smithery deployment.

It puts development commands, code-quality checks, and the server’s architecture in one place, reducing guesswork when changing or deploying the project.

How aniruddha-adhikary/gahmen-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to aniruddha-adhikary/gahmen-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/aniruddha-adhikary/gahmen-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/aniruddha-adhikary/gahmen-mcp

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/aniruddha-adhikary/gahmen-mcp/claude-md/github.svg)](https://agentmods.dev/instructions/aniruddha-adhikary/gahmen-mcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/aniruddha-adhikary/gahmen-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/aniruddha-adhikary/gahmen-mcp/claude-md/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/aniruddha-adhikary/gahmen-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/aniruddha-adhikary/gahmen-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 990 This file is loaded in full into every session.

When invoked 990 The same file — it is already loaded in full.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00990	$0.00990
Opus 5.5	$0.00396	$0.00396
Sonnet 5.5	$0.00198	$0.00198
Haiku 4.5	$0.00099	$0.00099

Measured 2mo ago against content hash c75b1b241cde, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

gahmen-mcp CLAUDE.md 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.

CLAUDE.md · 85 lines

How it starts

The opening of the file, as written. The whole thing — 85 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Development Commands

Core Development

npm run dev - Start development server with tsx (not Smithery dev server)
npx @smithery/cli dev - Start Smithery MCP development server on port 8181
npx @smithery/cli build - Build for Smithery deployment

Code Quality

npm run typecheck - TypeScript type checking (no emit)
npm run lint - Run ESLint on TypeScript files
npm run lint:fix - Auto-fix ESLint issues
npm run format - Format code with Prettier
npm run format:check - Check Prettier formatting
npm run build - Compile TypeScript to dist/

Architecture Overview

MCP Server Structure

This is a stateless MCP server that exposes Singapore's data.gov.sg APIs through Model Context Protocol tools. The server follows Smithery's convention requiring a default export function with signature ({ config }).

API Integration Pattern

The codebase integrates with 5 different API bases:

api-production.data.gov.sg/v2/public/api - Collections and Datasets APIs
data.gov.sg/api/action - CKAN Datastore Search API
api-open.data.gov.sg/v1/public/api - Download APIs
tablebuilder.singstat.gov.sg/api/table - SingStat Table Builder APIs

Rate Limiting Architecture

Built-in rate limiter implements 5 requests per minute (12-second intervals) as required by data.gov.sg APIs. All MCP tools automatically apply rate limiting before API calls.

HTTP Logging

Global axios interceptors provide comprehensive request/response logging with emojis for easy debugging. All API calls are automatically logged with parameters, responses, and errors.

Multi-Provider Architecture

The codebase supports both data.gov.sg APIs and SingStat Table Builder APIs. Tools are organized by provider in separate files:

src/datagovsg.tools.ts - Data.gov.sg API tools with datagovsg_ prefix
src/singstat.tools.ts - SingStat API tools with singstat_ prefix
src/index.ts - Main server that imports and registers all tools

Read the full file on GitHub · 85 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.

2mo ago First seen · 85 lines · 990 tokens per session scan A c75b1b241cde

Subscribe to this mod's changes

gahmen-mcp CLAUDE.md is an instructions file published in the GitHub repository aniruddha-adhikary/gahmen-mcp (4 stars, last pushed 1y ago), licensed MIT. It adds 990 tokens to every session, about $0.0040 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 2026-08-31.

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gahmen-mcp: Instructions file for Claude Code