How to Use the MailSlurp MCP in Pydantic AI

Q: How do I hook up MailSlurp to Pydantic AI?

Install pydantic-ai-slimmcp and set up an MCPToolset pointing to your Vinkius HTTP URL. Pass this toolset directly to your Agent instance. Do not use the deprecated MCPServerHTTP class.

Q: Can I check existing MailSlurp addresses with Pydantic AI?

Calling listallinboxes returns your current endpoints. The framework ensures the returned array matches the expected structure before your agent attempts to iterate over the addresses.

Q: How do I view messages in a specific MailSlurp inbox using Pydantic AI?

The agent runs listinboxemails with the target inbox ID. It receives a strongly typed list of message summaries, which you can then inspect or pass to other tools.

Type-safe email testing automation with MailSlurp and Pydantic AI.

See Vinkius in Action

Works with every AI agent you already use

…and any MCP-compatible client

MCP Servers - Free for Subscribers

Connect MailSlurp MCP to Pydantic AI

Create your Vinkius account to connect MailSlurp to Pydantic AI and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

GDPR Free for Subscribers

Setup MailSlurp with Pydantic AI

Ask AI about this MCP

ChatGPT

Claude

Perplexity

Manage addresses via Pydantic AI

The `create_random_inbox` tool builds disposable email endpoints that return strictly typed JSON to your agent. Pydantic AI validates the inbox ID and address format at runtime, ensuring your pipeline never chokes on a malformed string. You get a guaranteed, clean starting point for every test. Teardown happens through the `delete_specific_inbox` command. Your agent targets the exact ID validated during creation, wiping the address and its contents. If the API returns an unexpected confirmation schema, the framework fails loudly before corrupting your state.

Await messages with exact schemas

The `wait_for_latest_email` tool holds the execution thread until the target inbox receives a message. Instead of dealing with messy polling logic, your agent waits for a clean, validated response object containing the email body. Testing batch systems requires the `wait_for_email_count` function. The agent verifies that the exact number of transactional messages hit the endpoint. Every returned array matches your predefined Pydantic models, eliminating silent data corruption.

Extract and send via this MCP Server

The `get_email_details` tool pulls the complete message payload, including headers and attachments. Pydantic AI maps this raw data into your schema, letting you confidently check for specific HTML tags or attachment sizes in your tests. To test inbound processing, your agent triggers `send_email_from_inbox`. It constructs the recipient and body fields, firing a response back to your application. You can review the sent status through `list_inbox_emails` to confirm the dispatch.

Setup guide

Set up MailSlurp MCP in Pydantic AI

Prerequisites

Python 3.10+ installed
pydantic-ai-slim[fastmcp] package
Active Vinkius subscription with a valid endpoint token

1

Install Pydantic AI with FastMCP
Run pip install "pydantic-ai-slim[fastmcp]". The FastMCP toolset replaces the deprecated MCPServerHTTP class with full protocol support.
2

Configure the FastMCPToolset
Pass a JSON-style config dict to FastMCPToolset with your Vinkius URL. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. Supports Streamable HTTP, SSE, and Stdio transports.
3

Create and run your agent
Pass the toolset to Agent(toolsets=[toolset]) and call agent.run(). Swap openai:gpt-4o for any supported model — Anthropic, Google, Mistral, or Groq.

agent.py

from pydantic_ai import Agent
from pydantic_ai.toolsets.fastmcp import FastMCPToolset

toolset = FastMCPToolset({
    "mcpServers": {
        "mailslurp-mcp": {
            "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
        }
    }
})

agent = Agent(
    "openai:gpt-4o",
    toolsets=[toolset],
    system_prompt="You have access to MailSlurp tools.",
)

result = await agent.run("List recent MailSlurp transactions")
print(result.output)

Get your connection token →

Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by MailSlurp. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

Why Choose Vinkius

Vinkius connects your tools to AI with real-time monitoring and automatic cost savings — all from one dashboard.

Connect MailSlurp now

Real-time monitoring

Live

visibility into every interaction

Connect your favorite tools to your AI and see exactly what's happening — every request, every response, in real time.

Built-in savings

60%

lower AI costs

Vinkius compresses data between your apps and your AI automatically. Lower bills every month — no configuration required.

Single dashboard

One

place for every integration

Every tool your AI connects to, managed from a single screen. One account, complete control.

Common questions about MailSlurp MCP in Pydantic AI

Install `pydantic-ai-slim[mcp]` and set up an `MCPToolset` pointing to your Vinkius HTTP URL. Pass this toolset directly to your Agent instance. Do not use the deprecated `MCPServerHTTP` class.

Yes, any unexpected response from the API triggers a validation error. The agent stops immediately rather than passing hallucinated email data into your test assertions.

Calling `list_all_inboxes` returns your current endpoints. The framework ensures the returned array matches the expected structure before your agent attempts to iterate over the addresses.

The agent runs `list_inbox_emails` with the target inbox ID. It receives a strongly typed list of message summaries, which you can then inspect or pass to other tools.

The integration reads sensitive authentication tokens and raw HTML payloads from your test inboxes. Vinkius runs the connection in an ephemeral, stateless environment, ensuring your proprietary email templates vanish the second the connection drops.

Use it with your favorite AI tools

Connect this server to Cursor, Claude, VS Code, and more.

OpenAI Agents SDK sdk-python

Google ADK sdk-python

Pydantic AI sdk-python

Vercel AI SDK sdk-typescript