mcp

A Cursor rule document about building and using MCP integrations. It covers JSON-RPC warnings, logging, MCP types and imports, and progress callbacks; JSON-RPC is a format programs use to call one another.

In plain words
What is it for?
Use it when writing or reviewing MCP code that handles requests, logs activity, imports types, or reports progress.
Why use it?
It gives coding guidance for MCP-related work so these implementation details do not have to be worked out from scratch.

Cursor rule for Cursor

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.

agentmods
npx agentmods add rules/don-alberto/oboard_mcp/mcp
Clone the repo
git clone --depth 1 https://github.com/don-alberto/oboard_mcp

Made for: Cursor.

Per session 1,654 This file is loaded in full into every session.
When invoked 1,654 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
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 $0.01654 $0.01654
Opus 5 $0.00827 $0.00827
Sonnet 5 $0.00331 $0.00331
Haiku 4.5 $0.00165 $0.00165

Measured yesterday against content hash 0395617770f1, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

mcp 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 yesterday.

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.

.cursor/rules/mcp.mdc · 191 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. yesterday First seen · 191 lines · 1,654 tokens per session scan A 0395617770f1

Subscribe to this mod's changes

mcp is a cursor rule published in the GitHub repository don-alberto/oboard_mcp (0 stars, last pushed 1y ago), with no licence file. It adds 1,654 tokens to every session, about $0.0083 per session on Opus 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 2026-08-31.