Borrowing it
Nothing to install: this file belongs to scorbo2/mcp-light. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/scorbo2/mcp-light/master/.github/copilot-instructions.mdgit 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/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.
<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="Reviewed on agentmods" width="80" 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 5.1 | $0.00870 | $0.00870 |
| Opus 5.5 | $0.00348 | $0.00348 |
| Sonnet 5.5 | $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 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.
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.
- 2mo 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 (7 stars, last pushed 4mo ago), licensed MIT. It adds 870 tokens to every session, about $0.0035 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 2026-08-31.
mcp-light copilot-instructions.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| mcp-light copilot-instructions.mdscorbo2/mcp-light | Instructions file | 7 | 4mo ago | MIT | A | 870 | GitHub Copilot |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | yesterday | MIT | A | 7,461 | Codex, OpenCode |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | yesterday | MIT | A | 4,680 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 5,516 | GitHub Copilot |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |