What is arch-mcp-server AGENTS.md?

An AGENTS.md instruction file for a Rust-based Model Context Protocol server, including its project overview, commands, and development rules.

It guides building, checking, formatting, linting, and testing the Rust server, including its HTTP endpoint and MCP implementation.

It tells an AI coding assistant how the repository is structured, which checks are allowed, and which commands should not run automatically.

How Citizen4our/arch-mcp-server configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to Citizen4our/arch-mcp-server. 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/Citizen4our/arch-mcp-server/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/Citizen4our/arch-mcp-server

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/citizen4our/arch-mcp-server/agents-md/github.svg)](https://agentmods.dev/instructions/citizen4our/arch-mcp-server/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/citizen4our/arch-mcp-server/agents-md"><img src="https://agentmods.dev/badge/instructions/citizen4our/arch-mcp-server/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/citizen4our/arch-mcp-server/agents-md"><img src="https://agentmods.dev/badge/instructions/citizen4our/arch-mcp-server/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 2,305 This file is loaded in full into every session.

When invoked 2,305 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.

Model	Per session	Once invoked
Fable 5.1	$0.02305	$0.02305
Opus 5.5	$0.00922	$0.00922
Sonnet 5.5	$0.00461	$0.00461
Haiku 4.5	$0.00231	$0.00231

Measured 2mo ago against content hash 2ff929862fd0, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

arch-mcp-server 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 · 254 lines

How it starts

The opening of the file, as written. The whole thing — 254 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

Project Overview

This is a Rust-based Model Context Protocol (MCP) server that provides tools, prompts, and resources for AI agents. The project uses the rmcp library to implement MCP server functionality with HTTP transport, supporting tools, prompts, and resource management for AI agent interactions.

Build and Development Commands

Standard Rust Commands

Build: cargo build
Build release: cargo build --release
Check: cargo check
Test: cargo test
Run: cargo run
Format: cargo fmt
Clippy: cargo clippy

Development Server

Run server: cargo run --release (starts on 127.0.0.1:8010)
Test MCP connection: Connect to http://127.0.0.1:8010/mcp

Important: Do NOT run cargo run automatically

NEVER run cargo run or cargo run --release without explicit user request
Only run compilation commands: cargo check, cargo build, cargo test
Server startup should only happen when user explicitly asks for it

Testing Commands

Run all tests: cargo test
Run with output: cargo test -- --nocapture
Test specific module: cargo test counter

Code Quality Guidelines

Critical Thinking Checklist (MANDATORY)

Before proposing any solution, complete this checklist:

Question the problem itself: Is the complexity actually necessary? Can we eliminate the need entirely?
Find the simplest possible solution first: What would require the least code changes to solve this?
Challenge every assumption: Why does the current code work this way? Is it still relevant?
Look at actual usage: How is this code really used? Can we optimize for the common cases?
Design the API before implementation: What would be the cleanest interface for this functionality?

Problem-Solving Priority Order (MUST follow in sequence):

ELIMINATE - Can we remove the problem entirely by restructuring?
SIMPLIFY - Can we solve this trivially by changing the approach?
REUSE - Does existing code already solve this?
Only then: CREATE - Write new solution only if above options fail

Read the full file on GitHub · 254 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.

2mo ago First seen · 254 lines · 2,305 tokens per session scan A 2ff929862fd0

Subscribe to this mod's changes

arch-mcp-server AGENTS.md is an instructions file published in the GitHub repository Citizen4our/arch-mcp-server (2 stars, last pushed 6mo ago), licensed MIT. It adds 2,305 tokens to every session, about $0.0092 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.

arch-mcp-server AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
arch-mcp-server AGENTS.mdCitizen4our/arch-mcp-server	Instructions file	2	6mo ago	MIT	A	2,305	Codex, OpenCode
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

arch-mcp-server: Instructions file for Codex