A project document that sets coding standards for the localutils-mcp-server project and applies them through the Cursor code editor. It also requires Mermaid workflow diagrams for MCP implementations.

It is for checking how code should be written in this project and documenting how an MCP server handles requests, commands, data, and errors.

It gives contributors one place to follow the project's coding and documentation rules, reducing inconsistent implementations and missing workflow explanations.

How arjshiv/localutils-mcp-server configures Cursor

Reuse

Borrowing it

Nothing to install: this file belongs to arjshiv/localutils-mcp-server. 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/arjshiv/localutils-mcp-server/main/.cursorrules

Clone the repo

git clone --depth 1 https://github.com/arjshiv/localutils-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.

README.md

[![agentmods](https://agentmods.dev/badge/rules/arjshiv/localutils-mcp-server/cursorrules/github.svg)](https://agentmods.dev/rules/arjshiv/localutils-mcp-server/cursorrules)

Your own site

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

Per session 1,317 This file is loaded in full into every session.

When invoked 1,317 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 original 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	$0.01317	$0.01317
Opus 5.5	$0.00527	$0.00527
Sonnet 5.5	$0.00263	$0.00263
Haiku 4.5	$0.00132	$0.00132

Measured 2mo ago against content hash 8f39b4806fad, 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 · 133 lines

How it starts

The opening of the file, as written. The whole thing — 133 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Cursor Rules for localutils-mcp-server

This document defines the coding standards and rules for the localutils-mcp-server project. All rules are enforced through the Cursor IDE and are documented in detail in the .cursor/rules/ directory.

MCP Workflow Diagrams

All MCP implementations must include workflow diagrams using Mermaid. Below is the standard MCP workflow:

graph TD
    A[Client Request] --> B[MCP Server]
    B --> C{Protocol Handler}
    C --> D[Execute Command]
    C --> E[Process Data]
    C --> F[Handle Error]
    D --> G[Return Result]
    E --> G
    F --> G
    G --> B
    B --> H[Client Response]

    style A fill:#f9f,stroke:#333,stroke-width:2px
    style B fill:#bbf,stroke:#333,stroke-width:2px
    style C fill:#dfd,stroke:#333,stroke-width:2px

Required Workflow Documentation

Each MCP implementation must document:

graph LR
    A[Protocol Definition] --> B[Handler Implementation]
    B --> C[Error Handling]
    B --> D[Data Processing]
    B --> E[Command Execution]
    
    style A fill:#f96,stroke:#333,stroke-width:2px
    style B fill:#9cf,stroke:#333,stroke-width:2px

Core TypeScript Files

Pattern	Rule File	Description
`*.ts`	typescript.mdc	Core TypeScript source files
`*.tsx`	typescript.mdc	TypeScript React components
`src/*/.ts`	typescript.mdc	All TypeScript files in src
`src/utils/*.ts`	typescript.mdc	Utility TypeScript files
`src/types/*.ts`	typescript.mdc	Type definition files

Testing Files

Pattern	Rule File	Description
`*.test.ts`	testing.mdc	Unit test files
`*.spec.ts`	testing.mdc	Integration test files
`src/__tests__/**`	testing.mdc	Test directory and contents
`src/*/.test.ts`	testing.mdc	Tests throughout source
`src/test-utils/*.ts`	testing.mdc	Test utilities

Configuration Files

Pattern	Rule File	Description
`*.config.js`	config.mdc	JavaScript config files
`*.config.ts`	config.mdc	TypeScript config files
`tsconfig.json`	typescript-config.mdc	TypeScript configuration
`jest.config.js`	config.mdc	Jest test configuration
`.env*`	config.mdc	Environment configurations

Read the full file on GitHub · 133 lines

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 · 133 lines · 1,317 tokens per session scan A 8f39b4806fad

Subscribe to this mod's changes

cursorrules is a cursor rule published in the GitHub repository arjshiv/localutils-mcp-server (2 stars, last pushed 10mo ago), licensed MIT. It adds 1,317 tokens to every session, about $0.0053 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.

cursorrules next to 6 cursor rules from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
cursorrulesarjshiv/localutils-mcp-server	Cursor rule	2	10mo ago	MIT	A	1,317	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

localutils-mcp-server: Cursor rule for Cursor