Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add instructions/risadams/opengathyr/copilot-instructionsgit clone --depth 1 https://github.com/risadams/OpenGathyrWrote 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.
[](https://agentmods.dev/instructions/risadams/opengathyr/copilot-instructions)<a href="https://agentmods.dev/instructions/risadams/opengathyr/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/risadams/opengathyr/copilot-instructions.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00322 | $0.00322 |
| Opus 5 | $0.00161 | $0.00161 |
| Sonnet 5 | $0.00064 | $0.00064 |
| Haiku 4.5 | $0.00032 | $0.00032 |
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 4d 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 --> 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 toolssrc/services/rss-service.ts: Core service for RSS feed fetching and managementsrc/config/config.ts: Configuration managementsrc/types/: TypeScript type definitions
MCP Server Tools
The server exposes the following tools via the Model Context Protocol:
get-feed: Retrieve content from a specific feedsearch-feeds: Search for content across all RSS feedslist-feeds: List all available RSS feedsadd-feed: Add a new RSS feed to monitorremove-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
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.
- 4d ago First seen · 33 lines · 322 tokens per session scan C a393321354b7
OpenGathyr copilot-instructions.md is an instructions file published in the GitHub repository risadams/OpenGathyr (1 stars, last pushed 9mo ago), licensed MIT. It adds 322 tokens to every session, about $0.0016 per session on Opus 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.
Other instructions, from other repositories
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Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-release stance: foundation over blast radius, repository layout, commands and host sandbox failures.