filesystem-mcp: Cursor rule for Windsurf

.windsurfrules

windsurfrules is a cursor rule for Windsurf from sandraschi/filesystem-mcp. It costs 410 tokens per session, scanned A, original, MIT.

BEFORE making any changes or starting work, ALWAYS.

Cursor rule for Windsurf

Written for Windsurf: a Windsurf rule.

This is sandraschi/filesystem-mcp's own configuration. It tells Windsurf how to work on filesystem-mcp itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything filesystem-mcp configures →

Reuse

Borrowing it

Nothing to install: this file belongs to sandraschi/filesystem-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/sandraschi/filesystem-mcp/main/.windsurfrules
Clone the repo
git clone --depth 1 https://github.com/sandraschi/filesystem-mcp

Made for: Windsurf.

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 windsurfrules

README.md
[![agentmods](https://agentmods.dev/badge/rules/sandraschi/filesystem-mcp/windsurfrules.svg)](https://agentmods.dev/rules/sandraschi/filesystem-mcp/windsurfrules)
Your own site
<a href="https://agentmods.dev/rules/sandraschi/filesystem-mcp/windsurfrules"><img src="https://agentmods.dev/badge/rules/sandraschi/filesystem-mcp/windsurfrules.svg" alt="Measured on agentmods" height="20"></a>
Per session 410 This file is loaded in full into every session.
When invoked 410 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00410 $0.00410
Opus 5 $0.00205 $0.00205
Sonnet 5 $0.00082 $0.00082
Haiku 4.5 $0.00041 $0.00041

Measured today against content hash f2b4b18bf3af, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

windsurfrules 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 today.

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.

.windsurfrules · 55 lines

What it actually says

Central Documentation Rules

Rule #1: Read Central Docs First

BEFORE making any changes or starting work, ALWAYS:

  1. Read the Central Documentation README:

    • Location: D:\Dev\repos\mcp-central-docs\README.md
    • This shows all important documentation "branches" (folder trees)
    • Navigate from there to find specific information
  2. Follow Documentation Branches:

    • Central docs are organized by topic (Anthropic ecosystem, Google ecosystem, patterns, projects, etc.)
    • Each branch has its own README explaining what's inside
    • Use the branch structure to find relevant docs
  3. Check for Existing Patterns:

    • Look in docs/patterns/ for design patterns
    • Check templates/ for reusable templates
    • Review docs/projects/ for similar project examples
  4. Avoid Duplication:

    • Search existing docs before creating new ones
    • Update existing docs rather than creating duplicates
    • Reference central docs instead of copying content

Documentation Branches (from Central README)


Quick Reference

Central Docs Location: D:\Dev\repos\mcp-central-docs\

Start Here: D:\Dev\repos\mcp-central-docs\README.md

When in doubt: Read the central README and navigate from there.


Session Context (Filesystem MCP)

You have access to Filesystem MCP: 24 tools for file operations, Docker containers, and system monitoring.

Before starting work:

  1. Check system status: monitor_get_system_status(include_processes=False)
  2. Explore relevant directories: dir_ops(operation="list_directory", path="D:/Dev/repos")

At end of work, clean up:

  • Close long-running containers you started, verify locks with get_lock_status()
  • Prefer atomic writes through file_ops(operation="write_file") over raw file APIs
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. today First seen · 55 lines · 410 tokens per session scan A f2b4b18bf3af

Subscribe to this mod's changes

windsurfrules is a cursor rule published in the GitHub repository sandraschi/filesystem-mcp (6 stars, last pushed today), licensed MIT. It adds 410 tokens to every session, about $0.0020 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 2026-09-06.