Open-Meteo MCP Server (cmer81/open-meteo-mcp) is an MCP server listed on the M8ven Trust Index. It scores 74 out of 100, grade C. It declares 17 tools. No publisher has claimed this listing.

Back to MCP Trust IndexM8ven
C
Emerging
74/100
20 days ago

Open-Meteo MCP Server

Provides comprehensive access to Open-Meteo APIs for weather forecasts, historical data, air quality, and marine conditions. It enables LLMs to query specialized meteorological models, perform geocoding, and access advanced climate or flood projections.

→ cmer81/open-meteo-mcp· listed on glama

Emerging. No concerning findings. Grades remain capped until the project builds reputation through adoption. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.

How we verified

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Who stands behind it

cmer81

Source: Glama · also listed on mcp.so

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Install from

Glamamcp.so

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// key findings
✅
No credential exfiltration, no sensitive file access, no obfuscation
Static analysis found nothing flowing your secrets to unexpected places.
✅
Open source with a license and README
Anyone can audit the code, the license is declared, and the publisher documents what it does.
🔐
You'll be asked for 1 credential: API_KEY
These are read from process.env at runtime. Make sure you trust where they’ll be sent.
// environment variables
To run this server yourself, you supply these values. They go in your own MCP client configuration and stay on your machine. The secret label means the value is sensitive, not that the server mishandles it.
configALLOWED_ORIGINSIf a browser-based client connects to the server, list its origin in — requests carrying an unlisted Origin header are rejected with 403 as DNS rebinding protection.
🔐 secretAPI_KEYHOST=0.0.0.0 =your-secret-key RATE_LIMIT_RPM=60 TRANSPORT=http PORT=3000 npx open-meteo-mcp-server
configHOST0.0.0.0 API_KEY=your-secret-key RATE_LIMIT_RPM=60 TRANSPORT=http PORT=3000 npx open-meteo-mcp-server
configOPEN_METEO_AIR_QUALITY_API_URL"": "https://air-quality-api.open-meteo.com",
configOPEN_METEO_API_URL"": "https://api.open-meteo.com",
configOPEN_METEO_ARCHIVE_API_URL"": "https://archive-api.open-meteo.com",
configOPEN_METEO_CLIMATE_API_URL"": "https://climate-api.open-meteo.com"
configOPEN_METEO_ENSEMBLE_API_URL"": "https://ensemble-api.open-meteo.com",
configOPEN_METEO_FLOOD_API_URL"": "https://flood-api.open-meteo.com",
configOPEN_METEO_GEOCODING_API_URL"": "https://geocoding-api.open-meteo.com",
configOPEN_METEO_MARINE_API_URL"": "https://marine-api.open-meteo.com",
configOPEN_METEO_SEASONAL_API_URL"": "https://seasonal-api.open-meteo.com",
configRATE_LIMIT_RPMHOST=0.0.0.0 API_KEY=your-secret-key =60 TRANSPORT=http PORT=3000 npx open-meteo-mcp-server
configTRANSPORTThe server also supports Streamable HTTP transport for remote deployments. Set the environment variable to http:
configTRUSTED_PROXIES
Deployment configuration, supplied by whoever hosts the server. Users are not asked for these.
deployPORT
// quality suggestions

Tool annotations

No tools have read-only/destructive annotations

Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.

All four hints declared on every tool

17/17 tools missing one or more hints — weather_forecast (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); weather_archive (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); air_quality (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +14 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.

For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.

Tool test coverage

6/17 tools referenced in tests (35%)

Write tests that reference each tool by name so every tool has at least one test.

Claim the listing to review these findings one by one and send us a correction where you disagree, straight to the team. Claiming also means we tell you when the grade moves, and reach you first if we find anything urgent.

// full audit trail
The findings above are the summary. The full trail, every check we ran, each deduction, the network hosts observed and the dependency advisories, goes to verified publishers, along with an alert whenever a new one lands. Verified publishers can also review each finding and dispute it in one click. Publisher corrections have sharpened several of our checks this month, because the maintainer knows the codebase better than any scanner.
// improvement guidance — verified publishers only
We have 3 concrete improvements we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.
// embed badge in your README
[![M8ven Score](https://m8ven.ai/badge/mcp/cmer81/open-meteo-mcp)](https://m8ven.ai/mcp/cmer81/open-meteo-mcp)
Shows your grade and updates automatically. Prefer no grade? Append ?variant=verified to the badge URL.
commit: 3a5abf82ffea391954f62246c47bdf8ced67dbbf
code hash: ef0a527f3f70312947c9647ed79406782960668df35a7587d0aef1668f234fa3
verified: 8/21/2026, 9:45:15 PM
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