What is aviation-weather-mcp CLAUDE.md?

A project instruction file for an MCP server that gives language models current aviation weather data from the official NOAA/NWS aviation weather service. MCP is a standard way for AI tools to access external services.

Use it when developing, testing, linting, building, or reviewing the aviation weather MCP server.

It gives contributors consistent commands, code standards, error handling, request limits, and timeouts for maintaining the server.

How zealoushacker/aviation-weather-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to zealoushacker/aviation-weather-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/zealoushacker/aviation-weather-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/zealoushacker/aviation-weather-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/zealoushacker/aviation-weather-mcp/claude-md/github.svg)](https://agentmods.dev/instructions/zealoushacker/aviation-weather-mcp/claude-md)

Your own site

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

Per session 498 This file is loaded in full into every session.

When invoked 498 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	$0.00498	$0.00498
Opus 5	$0.00249	$0.00249
Sonnet 5	$0.00100	$0.00100
Haiku 4.5	$0.00050	$0.00050

Measured 10d ago against content hash 01f203119102, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

aviation-weather-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 10d 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 · 51 lines

What it actually says

Aviation Weather MCP Server

Project Overview

Model Context Protocol (MCP) server for aviation weather data
Uses aviationweather.gov API (official NOAA/NWS source)
Built with TypeScript, Express.js, and MCP SDK
Provides real-time aviation weather tools for LLMs

Development Commands

npm run dev - Development mode with auto-reload
npm run build - TypeScript compilation
npm run test - Jest test suite
npm run ci - Full CI pipeline (lint + test + build)
npm run lint:fix - Auto-fix linting issues

Code Style & Standards

Use conventional commits format (feat:, fix:, docs:, ci:, etc.)
TypeScript with strict typing and ES modules
ESLint with modern flat config
Prefer explicit error handling over throwing exceptions
Use _ prefix for unused function parameters

Architecture Patterns

Service layer: AviationWeatherService handles all API interactions
Tool registration: Separate files for weather, analysis, and airport tools
Error handling: Custom WeatherError type with error codes
Rate limiting: 1-second delay between API requests
Timeout handling: 10-second timeout with AbortController

Key Technical Details

Node.js 22.0.0+ required for ES module support
Jest 30.0.0 for testing with ESM configuration
Flight categories: VFR (e3000ft/e5SM), MVFR (1000-2999ft/3-4SM), IFR (500-999ft/1-2SM), LIFR (<500ft/<1SM)
API base URL: https://aviationweather.gov/api/data

Testing Strategy

Comprehensive unit tests with mocked HTTP calls
Test coverage for all tools and services
Flight category determination logic thoroughly tested
Use jest.mock() for external dependencies

CI/CD Pipeline

GitHub Actions on Node.js 18.x, 20.x, 22.x
Runs lint + test + build on every push/PR
Release workflow for version tags
Codecov integration ready

Deployment

Status: TBD (deployment documentation pending)
Requires Node.js hosting with ES module support
Environment variables: PORT, HOST, NODE_ENV

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.

10d ago First seen · 51 lines · 498 tokens per session scan A 01f203119102

Subscribe to this mod's changes

aviation-weather-mcp CLAUDE.md is an instructions file published in the GitHub repository zealoushacker/aviation-weather-mcp (6 stars, last pushed 1y ago), licensed MIT. It adds 498 tokens to every session, about $0.0025 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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aviation-weather-mcp: Instructions file for Claude Code