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OpenGathyr: Instructions file for GitHub Copilot

.github/copilot-instructions.md

OpenGathyr copilot-instructions.md is an instructions file for GitHub Copilot from risadams/OpenGathyr. It costs 322 tokens per session, scanned C, original, MIT.

Instructions for developing OpenGathyr, an MCP server that reads and manages RSS feeds. RSS feeds are regularly updated lists of articles or other published content.

In plain words
What is it for?
Use it to retrieve feed content, search feeds, list monitored feeds, add feeds, or remove feeds while developing the TypeScript and Node.js server.
Why use it?
It explains the project's structure, available tools, and coding expectations so changes fit the existing design.

Instructions file for GitHub Copilot

Written for GitHub Copilot: a Copilot instructions file.

This is risadams/OpenGathyr's own configuration. It tells GitHub Copilot how to work on OpenGathyr 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 OpenGathyr configures →

not rated 1repo 11mo ago C scan 322 tokens original MIT
View source ↗ risadams/OpenGathyr
Reuse

Borrowing it

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

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.

agentmods badge for OpenGathyr copilot-instructions.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/risadams/opengathyr/copilot-instructions/github.svg)](https://agentmods.dev/instructions/risadams/opengathyr/copilot-instructions)
Your own site
<a href="https://agentmods.dev/instructions/risadams/opengathyr/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/risadams/opengathyr/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.

agentmods 80×15 button for OpenGathyr copilot-instructions.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/risadams/opengathyr/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/risadams/opengathyr/copilot-instructions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 322 This file is loaded in full into every session.
When invoked 322 The same file — it is already loaded in full.
Security scan C 1 finding. 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 $0.00322 $0.00322
Opus 5.5 $0.00129 $0.00129
Sonnet 5.5 $0.00064 $0.00064
Haiku 4.5 $0.00032 $0.00032

Measured 2mo ago against content hash a393321354b7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade C, and why

OpenGathyr copilot-instructions.md scanned grade C with 1 finding 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.

Hidden instructionshighPrompt injection

Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.

<!-- Use this file to provide workspace-specific custom instructions to Copilot. For more details, visit https://code.visualstudio.com/docs/copilot/copilot-customization#_use-a-githubcopilotinstructionsmd-file -->
.github/copilot-instructions.md · 33 lines

What it actually says

OpenGathyr MCP RSS Feed Server

This is a Model Context Protocol (MCP) server project that communicates with various RSS feeds. The server follows a modular architecture and is built with TypeScript and Node.js.

Project Architecture

  • src/index.ts: Main entry point that sets up the MCP server and registers tools
  • src/services/rss-service.ts: Core service for RSS feed fetching and management
  • src/config/config.ts: Configuration management
  • src/types/: TypeScript type definitions

MCP Server Tools

The server exposes the following tools via the Model Context Protocol:

  1. get-feed: Retrieve content from a specific feed
  2. search-feeds: Search for content across all RSS feeds
  3. list-feeds: List all available RSS feeds
  4. add-feed: Add a new RSS feed to monitor
  5. remove-feed: Remove an RSS feed from monitoring

Development Guidelines

  • Use modern TypeScript features with strict typing
  • Follow a modular architecture to maintain scalability
  • Implement proper error handling for RSS feed operations
  • Ensure all MCP tools are properly documented
  • Maintain compatibility with the Model Context Protocol specification
  • The primary development environment is on Windows, using Powershell commands

You can find more info and examples about MCP at https://modelcontextprotocol.io/llms-full.txt

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 · 33 lines · 322 tokens per session scan C a393321354b7

Subscribe to this mod's changes

OpenGathyr copilot-instructions.md is an instructions file published in the GitHub repository risadams/OpenGathyr (1 stars, last pushed 11mo ago), licensed MIT. It adds 322 tokens to every session, about $0.0013 per session on Opus 5.5. A static security scan graded it C with 1 finding (hidden instructions). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Research
Related

OpenGathyr copilot-instructions.md compared with instructions from other repositories

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