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xrootd-mcp-server: Instructions file for GitHub Copilot

.github/copilot-instructions.md

xrootd-mcp-server copilot-instructions.md is an instructions file for GitHub Copilot from eic/xrootd-mcp-server. It costs 391 tokens per session, scanned A, original, MIT.

A set of GitHub Copilot instructions for a TypeScript/Node.js server that gives language models access to XRootD file systems. XRootD is used to access remote scientific files, such as data from high-energy and nuclear physics research.

In plain words
What is it for?
Use it when GitHub Copilot works on the XRootD MCP Server. It covers common tasks such as adding tools, changing remote file operations, handling metadata, and testing builds.
Why use it?
It provides quick project guidance while pointing agents to the main AGENTS.md file for full rules. It highlights path security, read-only access, performance limits, testing, and the main source files.

Instructions file for GitHub Copilot

Written for GitHub Copilot: a Copilot instructions file. Also seen: mentions AGENTS.md.

This is eic/xrootd-mcp-server's own configuration. It tells GitHub Copilot how to work on xrootd-mcp-server 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 xrootd-mcp-server configures →

not rated 1repo 4d ago A scan 391 tokens original MIT
View source ↗ eic/xrootd-mcp-server eic.github.io
Reuse

Borrowing it

Nothing to install: this file belongs to eic/xrootd-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/eic/xrootd-mcp-server/main/.github/copilot-instructions.md
Clone the repo
git clone --depth 1 https://github.com/eic/xrootd-mcp-server

Made for: GitHub Copilot.

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.

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README.md
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Your own site
<a href="https://agentmods.dev/instructions/eic/xrootd-mcp-server/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/eic/xrootd-mcp-server/copilot-instructions/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.

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Your own site · 80×15
<a href="https://agentmods.dev/instructions/eic/xrootd-mcp-server/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/eic/xrootd-mcp-server/copilot-instructions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 391 This file is loaded in full into every session.
When invoked 391 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00391 $0.00391
Opus 5.5 $0.00156 $0.00156
Sonnet 5.5 $0.00078 $0.00078
Haiku 4.5 $0.00039 $0.00039

Measured 2mo ago against content hash ea80f591d718, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

xrootd-mcp-server copilot-instructions.md 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.

.github/copilot-instructions.md · 51 lines

What it actually says

GitHub Copilot Instructions

For detailed instructions on working with this repository, please refer to:

AGENTS.md - Single source of truth for AI agent guidance

Quick Reference

This is the XRootD MCP Server project:

  • TypeScript/Node.js MCP server for XRootD file system access
  • Target: EIC (Electron-Ion Collider) scientific data analysis
  • Read AGENTS.md for architecture, conventions, and development guidelines

Key Points

  1. Security: All paths must be within XROOTD_BASE_DIR - use resolvePath()
  2. XRootD: Use xrdfs for metadata, xrdcp for file content
  3. MCP Protocol: Follow tool schema conventions in existing tools
  4. Performance: 50MB maxBuffer for xrdfs, respect cache settings
  5. Testing: Always test with npm run build and manual verification

Common Tasks

See AGENTS.md for:

  • Adding new tools (step-by-step guide)
  • Modifying XRootD operations
  • Working with file metadata
  • Testing changes
  • Code style guidelines
  • EIC-specific directory structure

Architecture

src/index.ts   - MCP server, tool definitions
src/xrootd.ts  - XRootD client, core functionality  
src/cache.ts   - Directory caching

Documentation

  • AGENTS.md - Complete AI agent instructions (read this first!)
  • README.md - User-facing documentation
  • CONTRIBUTING.md - Development guidelines
  • docs/CACHING.md - Caching strategy details
  • docs/ADVANCED_FEATURES.md - Tool usage guide

Always consult AGENTS.md before making significant changes to ensure consistency with project standards and conventions.

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. 2mo ago First seen · 51 lines · 391 tokens per session scan A ea80f591d718

Subscribe to this mod's changes

xrootd-mcp-server copilot-instructions.md is an instructions file published in the GitHub repository eic/xrootd-mcp-server (1 stars, last pushed 4d ago), licensed MIT. It adds 391 tokens to every session, about $0.0016 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 2026-09-01.

Backend and APIsScientific
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