mcp-weather-server

A Java (Spring Boot) MCP server that exposes weather data and real-time stock price data. It supports SSE streaming via a localhost endpoint and fetches stock prices from API Ninja using a provided API key.

Evaluated Apr 04, 2026 (16d ago)

Repo ↗ Ai Ml mcp spring-boot java sse weather stock-prices integration

⚙ Agent Friendliness

/ 100

Can an agent use this?

🔒 Security

/ 100

Is it safe for agents?

⚡ Reliability

/ 100

Does it work consistently?

Score Breakdown

⚙ Agent Friendliness

MCP Quality

Documentation

Error Messages

Auth Simplicity

Rate Limits

🔒 Security

TLS Enforcement

Auth Strength

Scope Granularity

Dep. Hygiene

Secret Handling

Provided materials only show an API key for a third-party (API Ninja). No evidence was given for TLS requirements, MCP endpoint authentication/authorization, scope-based access control, or secure secret handling beyond using env vars/properties. Transport security and server-side auth should be verified before production use.

⚡ Reliability

Uptime/SLA

Version Stability

Breaking Changes

Error Recovery

Best When

Used as a lightweight MCP integration/demo for agent tool use with SSE-style data delivery and external enrichment from weather/stock providers.

Avoid When

Avoid if you need strong guarantees around uptime, resilience behavior, or well-documented MCP tool schemas/error contracts (not shown in provided materials).

Use Cases

• Augmenting an MCP-capable assistant with current weather by location
• Providing near-real-time stock prices to an AI workflow
• Streaming updates to an agent/UI via Server-Sent Events (SSE)

Not For

• Production-grade financial/trading systems requiring audited pricing and SLAs
• Use cases needing offline operation (stock prices depend on external API calls)
• Highly reliable/low-latency streaming without load testing and resilience verification

Interface

REST API

GraphQL

gRPC

MCP Server

Yes ↗

SDK

Webhooks

Authentication

Methods: Environment variable API_NINJA_KEY application.properties api.ninja.key

OAuth: No Scopes: No

The README indicates an API key requirement for API Ninja (outbound dependency). It does not describe any authentication/authorization for the MCP server endpoint itself.

Pricing

Free tier: No

Requires CC: No

No pricing info for the MCP server itself was provided; runtime costs would include any API Ninja usage.

Agent Metadata

Pagination

none

Idempotent

False

Retry Guidance

Not documented

Known Gotchas

⚠ Stock prices rely on API Ninja; tool calls may fail during upstream outages or quota issues (no retry/error guidance shown).
⚠ SSE endpoint is localhost-based in the example; remote access/configuration may be required for real deployments.
⚠ Multiple Spring MVC/WebFlux branches exist; tool behavior may differ depending on which branch/config is used.

Alternatives

Other MCP servers that wrap weather/market data with documented tool schemas Direct API integrations (e.g., weather APIs + stock price APIs) from your agent code GraphQL/REST data providers with OpenAPI specs for easier automation

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API endpoint ↗ Agent guide ↗ Report inaccuracy

Scores are editorial opinions as of 2026-04-04.