meteo-mcp-rs

A fast, zero-API-key Model Context Protocol (MCP) weather server written in Rust, featuring an interactive MCP App (ui://meteo/dashboard) powered by the Open-Meteo API.

▶ Live demo — the real dashboard running in your browser against live Open-Meteo data.

Ask Claude (or any MCP Apps–capable host) for the weather and get an interactive dashboard with current telemetry, European Air Quality Index (PM2.5/PM10), a 24-hour temperature & precipitation chart, and a 7-day forecast — rendered directly inside the conversation with zero API keys or external Node/Python runtimes.

Features

• Single self-contained binary: ui/dashboard.html is embedded at compile time (include_str!), zero runtime asset dependencies.
• No API keys required: Uses Open-Meteo's free Geocoding, Forecast, and Air Quality APIs.
• MCP Apps (2026-01-26) compliant:
  • Serves UI resource ui://meteo/dashboard with MIME type text/html;profile=mcp-app.
  • Attaches _meta.ui.resourceUri and _meta.ui.visibility metadata to tools.
  • Supports host theme variables (light / dark), ResizeObserver auto-sizing, and inline/fullscreen display modes.
• Interactive UI-to-Server refreshes:
  • get_weather_dashboard (visibility: ["model", "app"]): Geocodes a city name and returns full weather + air quality telemetry.
  • refresh_by_coords (visibility: ["app"]): App-only hidden tool for instant coordinate-based refreshes and city preset pills without cluttering the LLM's tool list.
• Graceful degradation: If air quality telemetry is temporarily unavailable, the weather forecast still succeeds.

Architecture

┌──────────────────────────────┐        stdio (JSON-RPC)        ┌──────────────────────────────┐
│   MCP Host (Claude / IDE)    │ ◄────────────────────────────► │       meteo-mcp-rs           │
│                              │                                │                              │
│  ┌────────────────────────┐  │  tools/call + structuredData   │  • OpenMeteoClient (reqwest) │
│  │  ui://meteo/dashboard  │  │ ◄────────────────────────────► │  • MeteoServer (rmcp 3.10)   │
│  │  (Sandboxed Iframe)    │  │  resources/read (MCP App HTML) │  • Embedded ui/dashboard.html│
│  └────────────────────────┘  │                                └──────────────┬───────────────┘
└──────────────────────────────┘                                               │ HTTPS (rustls)
                                                                               ▼
                                                                    Open-Meteo Public APIs
                                                             (Geocoding / Forecast / Air Quality)

Quick Start

Homebrew (macOS / Linux)

brew install gohyperdev/tap/meteo-mcp-rs

Download prebuilt binaries

Grab the latest archive for your platform from GitHub Releases (each release also includes SHA256SUMS.txt):

Platform	Architecture	Archive
macOS	Apple Silicon (arm64)	meteo-mcp-rs-<version>-aarch64-apple-darwin.tar.gz
macOS	Intel (x86_64)	meteo-mcp-rs-<version>-x86_64-apple-darwin.tar.gz
Linux	x86_64	meteo-mcp-rs-<version>-x86_64-unknown-linux-gnu.tar.gz
Linux	arm64 (aarch64)	meteo-mcp-rs-<version>-aarch64-unknown-linux-gnu.tar.gz
Windows	x86_64	meteo-mcp-rs-<version>-x86_64-pc-windows-msvc.zip

Example install on macOS / Linux (replace <version> & <target>):

curl -fsSL "https://github.com/gohyperdev/meteo-mcp-rs/releases/latest/download/meteo-mcp-rs-v0.1.1-aarch64-apple-darwin.tar.gz" | tar -xz
sudo mv meteo-mcp-rs-v0.1.1-aarch64-apple-darwin/meteo-mcp-rs /usr/local/bin/

On macOS, if Gatekeeper blocks an unsigned downloaded binary:

xattr -d com.apple.quarantine /usr/local/bin/meteo-mcp-rs

Build from source

Requires Rust toolchain (rustc 1.88+ / edition 2024).

git clone https://github.com/gohyperdev/meteo-mcp-rs.git
cd meteo-mcp-rs
cargo build --release

The binary is compiled to target/release/meteo-mcp-rs.

Install via Cargo

From crates.io (compiles from source, requires the Rust toolchain; --locked builds with the exact dependency versions the release was tested against):

cargo install --locked meteo-mcp-rs

With cargo-binstall (downloads the prebuilt binary from GitHub Releases, no compilation):

cargo binstall meteo-mcp-rs

Or straight from the repository:

cargo install --git https://github.com/gohyperdev/meteo-mcp-rs

Configure in Claude Desktop

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "meteo": {
      "command": "/absolute/path/to/meteo-mcp-rs"
    }
  }
}

Configure in Claude Code

claude mcp add meteo /absolute/path/to/meteo-mcp-rs

Test with MCP Inspector

npx @modelcontextprotocol/inspector ./target/release/meteo-mcp-rs

Tools & Resources

Tools

Tool	Visibility	Arguments	Description
get_weather_dashboard	["model", "app"]	city: string	Geocodes a city and returns current weather, 24h hourly, 7-day forecast, and EU AQI telemetry.
refresh_by_coords	["app"]	name: string, latitude: number, longitude: number	App-only tool used by the interactive UI to refresh or switch preset cities without geocoding.

Resources

URI	MIME Type	Description
ui://meteo/dashboard	text/html;profile=mcp-app	Self-contained HTML/CSS/SVG/JS interactive weather dashboard (include_str!).

Development

# Check formatting
cargo fmt --all -- --check

# Lint
cargo clippy --all-targets -- -D warnings

# Run unit & mock-HTTP integration tests
cargo test

# Run with debug logs (written to stderr; stdout stays reserved for MCP JSON-RPC)
RUST_LOG=meteo_mcp_rs=debug cargo run

Links

• GitHub Releases — prebuilt binaries + SHA256SUMS.txt
• crates.io
• MCP Registry name: mcp-name: io.github.gohyperdev/meteo-mcp-rs
• Homebrew tap
• Live demo (GitHub Pages)

License

MIT — see LICENSE.