How to Use the Nhost MCP in Pydantic AI

Q: How do I initialize the Nhost MCP Server with Pydantic AI?

Install pydantic-ai-slimmcp. Create an MCPToolset pointing to your HTTP endpoint and pass it to your agent's toolsets array.

Q: How does Pydantic AI handle Nhost login failures?

If signinemailpassword returns an error payload instead of a session object, Pydantic AI catches the schema mismatch and halts execution immediately.

Q: Can I use local models to run the Nhost MCP Server with Pydantic AI?

Yes. The framework is model-agnostic. You can route signinanonymous or signout commands through OpenAI, Anthropic, or a local LLaMA instance.

Q: Does the agent know how to delete files?

It does. The agent invokes deletefile with the exact file ID. The framework ensures the ID string meets your validation rules before sending the request.

Enforce strict runtime validation for authentication and storage tasks using the Nhost MCP Server and Pydantic AI.

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Setup Nhost with Pydantic AI

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Claude

Perplexity

Type-Safe Authentication

The Nhost MCP Server provides 15 tools that Pydantic AI validates against strict schemas at runtime. If your agent calls `signin_email_password` and the API returns an unexpected session object, the framework throws a loud validation error. You never deal with silent data corruption. The agent executes `signup_otp_email` or `reset_password`, and Pydantic AI ensures the response perfectly matches the expected structure before moving to the next step.

Validated File Operations

Storage management requires exact metadata handling. When the agent uses `upload_file`, the returned file details must pass your Pydantic model checks. This prevents hallucinated URLs or missing IDs. The agent securely requests a download link via `get_file_presigned_url` or pulls raw bytes with `get_file`, guaranteeing the data format is exactly what your application expects.

Nhost MCP Server Access Control

Elevated profile actions demand precise credential handling. Tools like `change_email` and `get_user` require an active `NHOST_JWT`, which your agent passes as a typed argument. You configure the unified `MCPToolset` with your endpoint, and the agent handles the rest. If a session expires, it calls `refresh_token` and validates the new token payload before continuing its work.

Setup guide

Set up Nhost 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": {
        "nhost-mcp": {
            "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
        }
    }
})

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

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

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Common questions about Nhost MCP in Pydantic AI

Install `pydantic-ai-slim[mcp]`. Create an `MCPToolset` pointing to your HTTP endpoint and pass it to your agent's `toolsets` array.

If `signin_email_password` returns an error payload instead of a session object, Pydantic AI catches the schema mismatch and halts execution immediately.

Yes. The framework is model-agnostic. You can route `signin_anonymous` or `signout` commands through OpenAI, Anthropic, or a local LLaMA instance.

It does. The agent invokes `delete_file` with the exact file ID. The framework ensures the ID string meets your validation rules before sending the request.

The server processes user email addresses to trigger reset flows. Because the framework logs validation errors loudly, you must configure your error handlers to redact user emails before they hit your monitoring dashboard.

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