A set of project rules for AI agents that work with specific application programming interfaces, or APIs. The rules give each agent detailed knowledge of its assigned API.

Use it in projects where AI agents need reliable, domain-specific guidance for particular APIs.

It helps reduce made-up answers when an agent is working with API-specific details.

How gianjohn88/XP-MCP configures Cursor

Reuse

Borrowing it

Nothing to install: this file belongs to gianjohn88/XP-MCP. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/gianjohn88/XP-MCP/main/.cursorrules

Clone the repo

git clone --depth 1 https://github.com/gianjohn88/XP-MCP

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.

README.md

[![agentmods](https://agentmods.dev/badge/rules/gianjohn88/xp-mcp/cursorrules/github.svg)](https://agentmods.dev/rules/gianjohn88/xp-mcp/cursorrules)

Your own site

<a href="https://agentmods.dev/rules/gianjohn88/xp-mcp/cursorrules"><img src="https://agentmods.dev/badge/rules/gianjohn88/xp-mcp/cursorrules/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.

Your own site · 80×15

<a href="https://agentmods.dev/rules/gianjohn88/xp-mcp/cursorrules"><img src="https://agentmods.dev/badge/rules/gianjohn88/xp-mcp/cursorrules.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 2,749 This file is loaded in full into every session.

When invoked 2,749 The same file — it is already loaded in full.

Security scan A 0 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.

Model	Per session	Once invoked
Fable 5.1	$0.02749	$0.02749
Opus 5.5	$0.01100	$0.01100
Sonnet 5.5	$0.00550	$0.00550
Haiku 4.5	$0.00275	$0.00275

Measured 2mo ago against content hash 4caa195ae471, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

cursorrules 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 2mo 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.

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.

.cursorrules · 246 lines

The source is not reproduced here

No licence file

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.

2mo ago First seen · 246 lines · 2,749 tokens per session scan A 4caa195ae471

Subscribe to this mod's changes

cursorrules is a cursor rule published in the GitHub repository gianjohn88/XP-MCP (2 stars, last pushed 9mo ago), with no licence file. It adds 2,749 tokens to every session, about $0.0110 per session on Opus 5.5. 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.

Building agents

cursorrules next to 6 cursor rules from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
cursorrulesgianjohn88/XP-MCP	Cursor rule	2	9mo ago	none	A	2,749	Cursor
ponytailDietrichGebert/ponytail	Cursor rule	185k	8d ago	MIT	A	604	Cursor
angular-20angular/angular	Cursor rule	101k	yesterday	MIT	A	0	Cursor
dev-standardapache/superset	Cursor rule	75k	yesterday	Apache-2.0	A	1,147	Cursor
prefer-assertions-over-defensive-checksprisma/orm	Cursor rule	48k	yesterday	Apache-2.0	A	0	Cursor
prefer-direct-imports-over-module-mocksprisma/orm	Cursor rule	48k	yesterday	Apache-2.0	A	0	Cursor
shared-plane-packagesprisma/orm	Cursor rule	48k	yesterday	Apache-2.0	A	0	Cursor

XP-MCP: Cursor rule for Cursor