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first-mcp-server: Instructions file for Claude Code

CLAUDE.md

first-mcp-server CLAUDE.md is an instructions file for Claude Code from geka-evk/first-mcp-server. It costs 641 tokens per session, scanned A, original, MIT.

A project instruction file for a TypeScript server that uses the Model Context Protocol, a way for AI tools to connect to external tools and data. It documents the project structure and its development commands.

In plain words
What is it for?
Use it when building or running the server, testing with Jest, linting and formatting code, checking TypeScript types, or reviewing dependencies and security.
Why use it?
It gives the coding agent repository-specific guidance instead of making it infer how to build, test, check, and maintain the project.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions CLAUDE.md; mentions Claude Code.

This is geka-evk/first-mcp-server's own configuration. It tells Claude Code how to work on first-mcp-server 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 first-mcp-server configures →

not rated 0repo 1y ago A scan 641 tokens original MIT
View source ↗ geka-evk/first-mcp-server
Reuse

Borrowing it

Nothing to install: this file belongs to geka-evk/first-mcp-server. 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/geka-evk/first-mcp-server/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/geka-evk/first-mcp-server

Made for: Claude Code.

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README.md
[![agentmods](https://agentmods.dev/badge/instructions/geka-evk/first-mcp-server/claude-md.svg)](https://agentmods.dev/instructions/geka-evk/first-mcp-server/claude-md)
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<a href="https://agentmods.dev/instructions/geka-evk/first-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/geka-evk/first-mcp-server/claude-md.svg" alt="Measured on agentmods" height="20"></a>
Per session 641 This file is loaded in full into every session.
When invoked 641 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00641 $0.00641
Opus 5 $0.00320 $0.00320
Sonnet 5 $0.00128 $0.00128
Haiku 4.5 $0.00064 $0.00064

Measured 7d ago against content hash 3a431dfdf003, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

first-mcp-server 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 7d 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 · 63 lines

How it starts

The opening of the file, as written. The whole thing — 63 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.

Project Overview

This is a TypeScript project named "first-mcp-server" - an MCP (Model Context Protocol) server implementation. The project includes modern TypeScript tooling, testing, linting, and formatting configurations.

Development Commands

Build & Run:

  • npm run build - Build project using tsup (generates CommonJS output with sourcemaps)
  • npm start - Run the built application from dist/
  • npm run start:dev - Run development server with ts-node

Testing:

  • npm run test - Run Jest tests
  • npm run test:watch - Run Jest in watch mode for development
  • npm run test:coverage - Run tests with coverage report

Code Quality:

  • npm run lint - Run ESLint on source and test files
  • npm run lint:fix - Fix ESLint issues automatically
  • npm run format - Format code with Prettier
  • npm run type-check - Run TypeScript type checking without emitting files

Maintenance:

  • npm run audit:check - Check for security vulnerabilities using audit-ci
  • npm run dep:check - Check for outdated dependencies
  • npm run dep:update - Update dependencies to latest versions
  • npm run release - Create a release using standard-version
  • npm run snapshot - Create a snapshot prerelease

Project Architecture

Module System:

  • Uses path mapping with #src/* aliases for clean imports (configured in tsconfig.json:5)
  • Jest configured with matching module name mapping for tests (jest.config.js:6-9)

Build Configuration:

  • tsup: Currently builds CommonJS only (tsup.config.ts:6) - ESM and type definitions are commented out
  • TypeScript: Strict mode with enhanced checking including noUncheckedIndexedAccess (tsconfig.json:10)
  • Target: ES2022 with source maps and declarations enabled

Testing Setup:

  • Jest with ts-jest preset and Node environment
  • Setup file at test/setup.ts for global test configuration
  • Coverage collection from all src/ files with appropriate exclusions
  • Supports both #src/ and #test/ path aliases

Read the full file on GitHub · 63 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. 7d ago First seen · 63 lines · 641 tokens per session scan A 3a431dfdf003

Subscribe to this mod's changes

first-mcp-server CLAUDE.md is an instructions file published in the GitHub repository geka-evk/first-mcp-server (0 stars, last pushed 1y ago), licensed MIT. It adds 641 tokens to every session, about $0.0032 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.

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