# Authenticated MCP Agent

> Authenticated MCP Agent — a2a-authenticated-mcp-agent. Use this tool when you need to securely interact with a large language model (LLM) using authenticated requests, as it provides a JWT-gated gateway for LangChain-on-Vertex Gemini completion, rejecting unauthenticated calls. This tool solves problems related to protocol-layer authentication and secure agent gateways, ideal for use cases requiring authenticated LLM access. It accepts authenticated requests with JWT tokens and returns LLM completion outputs, making it suitable for applications requiring secure and authenticated AI interactions.

Canonical page: https://skillsregistry.net/skills/a2a-authenticated-mcp-agent  
JSON: https://api.skillsregistry.net/v1/skills/a2a-authenticated-mcp-agent

## Description

JWT-gated LLM gateway: authenticate (bcrypt/JWT), then run a LangChain-on-Vertex Gemini completion. Unauthenticated calls are rejected. Ideal for protocol-layer auth + LLM over MCP, JWT-gated tool servers, secure agent gateways.

## Trust

- **Trust score (0–1):** 0.30
- **Verification tier:** unverified
- **Last scanned:** 2026-08-30

## Facts

- **Version:** 1.0.0
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** ai-ml
- **Updated:** 2026-08-30

## Source

- **Source listing:** [Smithery](https://smithery.ai/server/a2a/authenticated-mcp-agent)

## Use it

Resolve this record through the SkillsRegistry MCP server (no auth, read-only):

```
claude mcp add --transport http --scope user skillsregistry https://api.skillsregistry.net/mcp
```

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_skill",
    "arguments": {
      "slug": "a2a-authenticated-mcp-agent"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/a2a-authenticated-mcp-agent` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/a2a-authenticated-mcp-agent/pull`

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SkillsRegistry indexes agent skills from public registries and GitHub. Skills we have analysed are scanned with Circle-IR and scored on six dimensions; each listing states its scan coverage. More: https://skillsregistry.net/llms.txt