agentmods.dev

mcp-light: Instructions file for Codex

AGENTS.md

mcp-light AGENTS.md is an instructions file for Codex, OpenCode from scorbo2/mcp-light. It costs 516 tokens per session, scanned A, original, MIT.

Project instructions for mcp-light, a small Java server that exposes tools, resources, and prompts through the Model Context Protocol.

In plain words
What is it for?
Use them when working on mcp-light: build it with Maven, run its generated JAR, compile it, run tests, or add tools, resources, and prompts.
Why use it?
They provide the commands, architecture, and naming rules needed to build, run, and modify the server correctly.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: mentions AGENTS.md.

This is scorbo2/mcp-light's own configuration. It tells Codex and OpenCode how to work on mcp-light 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 mcp-light configures →

not rated 7repo 4mo ago A scan 516 tokens original MIT
View source ↗ scorbo2/mcp-light
Reuse

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.

Copy the file
curl -O https://raw.githubusercontent.com/scorbo2/mcp-light/master/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/scorbo2/mcp-light

Made for: Codex, OpenCode.

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 mcp-light AGENTS.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/scorbo2/mcp-light/agents-md/github.svg)](https://agentmods.dev/instructions/scorbo2/mcp-light/agents-md)
Your own site
<a href="https://agentmods.dev/instructions/scorbo2/mcp-light/agents-md"><img src="https://agentmods.dev/badge/instructions/scorbo2/mcp-light/agents-md/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 mcp-light AGENTS.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/scorbo2/mcp-light/agents-md"><img src="https://agentmods.dev/badge/instructions/scorbo2/mcp-light/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 516 This file is loaded in full into every session.
When invoked 516 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 $0.00516 $0.00516
Opus 5.5 $0.00206 $0.00206
Sonnet 5.5 $0.00103 $0.00103
Haiku 4.5 $0.00052 $0.00052

Measured 2mo ago against content hash 9c258c0aa5fc, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mcp-light AGENTS.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.

AGENTS.md · 33 lines

How it starts

The opening of the file, as written. The whole thing — 33 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

Quick commands

Task Command
Build mvn clean package
Run (default port 8080) java -jar target/mcp-light-1.1.jar
Run (custom port) java -jar target/mcp-light-1.1.jar 9090
Tests mvn test
Compile only mvn compile

Architecture

Single package ca.corbett.mcp. No framework — bare Java 25 + com.sun.net.httpserver + Jackson.

  • McpServer — HTTP server (port/path configurable). Registers tools/resources, routes JSON-RPC methods.
  • McpTool — interface to implement for callable tools. execute() runs on the HTTP handler thread (synchronous).
  • McpResource — interface to implement for readable resources. getContent() runs on the HTTP handler thread. Supports binary (base64) via isBinary().
  • McpPrompt — interface to implement for prompts.
  • ExampleApp — runnable entry point with sample tool and resources. Set as main class in the jar manifest.

Gotchas

  • Tool/resource/prompt names Tool/resource/prompt names must match ^[a-zA-Z0-9._-]+$ and are treated as case-insensitively unique — enforced at registration and will throw IllegalArgumentException for invalid names.
  • Jackson is configured for case-insensitive property matching and ignoring unknown properties — MCP clients may send slightly malformed JSON.
  • Port 0 in the constructor = random available port (useful for tests). Use server.getPort() to discover it.
  • McpServer is thread-safe for register/unregister via CopyOnWriteArrayList.
  • GPG signing is skipped by default (gpg.skip=true). Set to false for Sonatype Central publishing.
  • Sonatype publishing is skipped by default (skipPublishing=true). Set to false to enable.
  • Tests use port 0 and discover the actual port via server.getPort(). Never hardcode a port in tests.
  • No lint, formatter, or typecheck steps beyond mvn compile / mvn test. Code style follows IntelliJ defaults (.editorconfig).

Read the full file on GitHub · 33 lines

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 · 516 tokens per session scan A 9c258c0aa5fc

Subscribe to this mod's changes

mcp-light AGENTS.md is an instructions file published in the GitHub repository scorbo2/mcp-light (7 stars, last pushed 4mo ago), licensed MIT. It adds 516 tokens to every session, about $0.0021 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.

Related

mcp-light AGENTS.md compared with instructions from other repositories

mcp-light AGENTS.md next to 6 instructions from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
mcp-light AGENTS.mdscorbo2/mcp-lightInstructions file74mo agoMITA516Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA9,719GitHub Copilot
next.js AGENTS.mdvercel/next.jsInstructions file143kyesterdayMITA7,461Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchainInstructions file149kyesterdayMITA4,680Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA5,516GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA3,093GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harnessInstructions file274k2d agoMITA4,313Codex, OpenCode