Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add giuseppe-trisciuoglio/developer-kit --skill langchain4j-mcp-server-patternsgit clone --depth 1 https://github.com/giuseppe-trisciuoglio/developer-kitWrote 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.
[](https://agentmods.dev/skills/giuseppe-trisciuoglio/developer-kit/langchain4j-mcp-server-patterns)<a href="https://agentmods.dev/skills/giuseppe-trisciuoglio/developer-kit/langchain4j-mcp-server-patterns"><img src="https://agentmods.dev/badge/skills/giuseppe-trisciuoglio/developer-kit/langchain4j-mcp-server-patterns/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.
<a href="https://agentmods.dev/skills/giuseppe-trisciuoglio/developer-kit/langchain4j-mcp-server-patterns"><img src="https://agentmods.dev/badge/skills/giuseppe-trisciuoglio/developer-kit/langchain4j-mcp-server-patterns.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket warn
- Snyk pass
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 | $0.00076 | $0.01258 |
| Opus 5.5 | $0.00030 | $0.00503 |
| Sonnet 5.5 | $0.00015 | $0.00252 |
| Haiku 4.5 | $0.00008 | $0.00126 |
Grade A, and why
langchain4j-mcp-server-patterns 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 1mo 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.
How it starts
The opening of the file, as written. The whole thing — 169 lines — stays where its author put it; the contents beside it link to each section on GitHub.
LangChain4j MCP Server Implementation Patterns
Overview
Use this skill to design and implement Model Context Protocol (MCP) integrations with LangChain4j.
The main concerns are:
- defining a clean tool, resource, and prompt surface
- choosing the right transport and bootstrap model
- filtering unsafe capabilities before exposing them to agents or applications
Keep SKILL.md focused on the implementation flow. Use the bundled references for expanded examples and API-level detail.
When to Use
Use this skill when:
- building a Java MCP server that exposes tools, resources, or prompts
- integrating LangChain4j with one or more external MCP servers
- wiring MCP support into a Spring Boot application
- filtering available tools by tenant, user role, or runtime context
- adding observability, resilience, and safe failure handling around MCP interactions
- reviewing an MCP integration for prompt-injection and side-effect risks
Typical trigger phrases include langchain4j mcp, java mcp server, mcp tool provider, spring boot mcp, and connect langchain4j to mcp.
Instructions
1. Design the MCP surface before writing code
Decide what the server should expose:
- tools for actions with clear inputs and side effects
- resources for read-only or structured data access
- prompts only when a reusable template adds real value
Keep names stable, descriptions concrete, and schemas small enough for a client or model to understand quickly.
2. Implement providers with narrow responsibilities
Use separate classes for each concern:
- tool provider for executable functions
- resource provider for discoverable and readable data
- prompt provider for reusable prompt templates
Validate arguments before execution and return clear error messages for invalid input or unavailable dependencies.
3. Choose the transport intentionally
Use:
- stdio for local integrations, CLI tools, and sidecar processes
- HTTP or SSE for remote or shared services
Pin external server versions and document how the process is started, authenticated, and monitored.
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 1mo ago First seen · 169 lines · 76 tokens per session scan A a7d4f5528be9
langchain4j-mcp-server-patterns is a skill published in the GitHub repository giuseppe-trisciuoglio/developer-kit (360 stars, last pushed 1mo ago), licensed MIT. It adds 76 tokens to every session and 1,258 once invoked, about $0.0003 per session on Opus 5.5. 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 2026-09-10.
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