mcp-server

Provides an MCP server (implemented in Java) that exposes two tools: (1) real-time weather retrieval via the QWeather API, and (2) Google-search-results querying via the Serper API. Includes an example of using LangChain4J with an MCP client over stdio.

Evaluated Apr 04, 2026 (16d ago)

Repo ↗ Ai Ml mcp langchain4j weather search java stdio tools

⚙ 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

Uses external API keys (passed via application.yml/CLI args). No mention of MCP authentication/authorization or tool-level access control. Secret handling practices are not documented (e.g., avoiding logging secrets). TLS is likely used for outbound HTTPS to third-party APIs based on example URLs, but MCP server transport security (if exposed remotely) is not described. Scope/granularity is effectively not addressed.

⚡ Reliability

Uptime/SLA

Version Stability

Breaking Changes

Error Recovery

Best When

You want a simple, locally launched MCP toolset to augment an LLM with weather and web search-like capabilities (via third-party APIs).

Avoid When

You cannot control outbound network access to QWeather/Serper, or you need strong documented auth/rate-limit/error-contract guarantees for the MCP server.

Use Cases

• AI assistants that can answer questions about current weather for a given city
• AI assistants that can query Google search results for trending topics or fact-finding

Not For

• Production systems that require strict reliability/SLA, because operational details are not documented
• Use cases requiring fine-grained authorization and tool-level security controls
• Environments where running arbitrary third-party MCP server jars over stdio is disallowed

Interface

REST API

GraphQL

gRPC

MCP Server

Yes

SDK

Webhooks

Authentication

Methods: API keys for QWeather (qweather.com) API keys for Serper (serper.dev) MCP server launched with command-line args for API keys

OAuth: No Scopes: No

Authentication to the MCP server itself is not described; API keys are passed to the server process. Tool auth boundaries/scopes are not documented.

Pricing

Free tier: No

Requires CC: No

No pricing for the MCP server is provided; costs likely depend on QWeather and Serper usage.

Agent Metadata

Pagination

none

Idempotent

False

Retry Guidance

Not documented

Known Gotchas

⚠ The README suggests you must replace placeholder host URLs in Java service code, which may break the server if not done correctly.
⚠ Tool definitions/inputs/outputs for the MCP server are not shown; agents may need to infer argument formats.
⚠ No documented retry/idempotency or structured error contract for MCP responses.
⚠ The server relies on external third-party APIs (QWeather/Serper); failures may propagate to the agent without guidance.

Alternatives

Use a dedicated MCP weather/search provider (if available in your ecosystem) Call QWeather and Serper directly from your application instead of via MCP Use LangChain4J tool integrations for weather/search without MCP (if available)

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