fastMCP_py-core

fastMCP_py-core is a cursor rule for Cursor from Datai-Network/datai-mcp-server. It costs 5 tokens per session (5,341 once invoked), scanned C, original, no licence file.

Core guidance for FastMCP, a Python framework for building MCP servers that expose tools and resources to AI models, including local and HTTP-based connections.

In plain words
What is it for?
Use it when creating a FastMCP server, configuring its connection method, or handling tool calls and resources.
Why use it?
It explains the main server, transport, and protocol-handling pieces needed for an MCP service.

Cursor rule for Cursor

Written for Cursor: installed under .cursor/.

Good fit Use it when creating a FastMCP server, configuring its connection method, or handling tool calls and resources.

Compare 6 cursor rules from other repositories ↓
Install with agentmods
npx agentmods add rules/datai-network/datai-mcp-server/fastmcp_py-core
Install

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.

Clone the repo
git clone --depth 1 https://github.com/Datai-Network/datai-mcp-server

Made for: Cursor.

Wrote 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.

agentmods badge for fastMCP_py-core

README.md
[![agentmods](https://agentmods.dev/badge/rules/datai-network/datai-mcp-server/fastmcp_py-core/github.svg)](https://agentmods.dev/rules/datai-network/datai-mcp-server/fastmcp_py-core)
Your own site
<a href="https://agentmods.dev/rules/datai-network/datai-mcp-server/fastmcp_py-core"><img src="https://agentmods.dev/badge/rules/datai-network/datai-mcp-server/fastmcp_py-core/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.

agentmods 80×15 button for fastMCP_py-core

Your own site · 80×15
<a href="https://agentmods.dev/rules/datai-network/datai-mcp-server/fastmcp_py-core"><img src="https://agentmods.dev/badge/rules/datai-network/datai-mcp-server/fastmcp_py-core.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 5 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 5,341 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 2 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00005 $0.05341
Opus 5.5 $0.00002 $0.02136
Sonnet 5.5 $0.00001 $0.01068
Haiku 4.5 $0.00001 $0.00534

Measured 1mo ago against content hash 479705d89b04, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade C, and why

fastMCP_py-core scanned grade C with 2 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.

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

&& rm -rf /var/lib/apt/lists/*

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl \
.cursor/rules/fastMCP_py/fastMCP_py-core.mdc · 784 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Changes

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.

  1. 1mo ago First seen · 784 lines · 5 tokens per session scan C 479705d89b04

Subscribe to this mod's changes

fastMCP_py-core is a cursor rule published in the GitHub repository Datai-Network/datai-mcp-server (3 stars, last pushed 1y ago), with no licence file. It adds 5 tokens to every session and 5,341 once invoked, about $0.0000 per session on Opus 5.5. A static security scan graded it C with 2 findings (recursive force delete, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.