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/scorbo2/mcp-light/copilot-instructionsgit clone --depth 1 https://github.com/scorbo2/mcp-lightWrote 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/scorbo2/mcp-light/copilot-instructions)<a href="https://agentmods.dev/instructions/scorbo2/mcp-light/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/scorbo2/mcp-light/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 | $0.00870 | $0.00870 |
| Opus 5 | $0.00435 | $0.00435 |
| Sonnet 5 | $0.00174 | $0.00174 |
| Haiku 4.5 | $0.00087 | $0.00087 |
Grade A, and why
mcp-light 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 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.
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.
How it starts
The opening of the file, as written. The whole thing — 50 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Copilot Instructions
Commands
| Task | Command |
|---|---|
| Build | mvn clean package |
| Test (full suite) | mvn test |
| Test (single test) | mvn test -Dtest=McpServerTest#isUp_withServerRunning_shouldReportTrue |
| Compile only | mvn compile |
| Run (default port 8080) | java -jar target/mcp-light-1.1.jar |
| Run (custom port) | java -jar target/mcp-light-1.1.jar 9090 |
No separate lint or format step — mvn compile is the check. Code style follows IntelliJ defaults (.editorconfig).
Architecture
Single package ca.corbett.mcp. No framework — bare Java 25 + com.sun.net.httpserver + Jackson (only two dependencies).
Core classes:
McpServer— HTTP server. Accepts port/path/threads in constructor. Routes JSON-RPC 2.0 methods (initialize,tools/list,tools/call,resources/list,resources/read,ping). Supports OPTIONS for CORS.McpTool— interface for callable tools. ImplementgetName(),getDescription(),getInputSchema(), andexecute(Map<String, Object> input).McpResource— interface for readable resources. ImplementgetName(),getUri(),matchesUri(String),getMimeType(), andgetContent(String requestedUri). OptionalisBinary()for base64 content.McpPrompt— interface for prompts. ImplementgetName(),getDescription(),getArguments(), andgetMessages().ExampleApp— runnable main class (set in jar manifest). Shows how to wire up a server with tools and resources.McpRequest/McpRequest2— Jackson-mapped request models.McpResponse/McpError/McpToolContent/McpResourceContent— response/error payload models.
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 · 50 lines · 870 tokens per session scan A 7913d11b4ed9
mcp-light copilot-instructions.md is an instructions file published in the GitHub repository scorbo2/mcp-light (6 stars, last pushed 1mo ago), licensed MIT. It adds 870 tokens to every session, about $0.0043 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 2026-08-31.
Other instructions, from other repositories
vscode buildNext.instructions.md
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.
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.
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).
next.js AGENTS.md
Instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.