What is virtual_engineer AGENTS.md?

Repository instructions for a Virtual Engineer demo made of an MCP retrieval server, an AI agent, a React interface, and sample Atlas data.

Use them when running, testing, changing sample data, or working on the backend, frontend, MCP tools, or agent.

They explain the project layout, local agent settings, commands, tests, and data workflows so development follows the repository's intended process.

How benkipnis/virtual_engineer configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to benkipnis/virtual_engineer. 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/benkipnis/virtual_engineer/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/benkipnis/virtual_engineer

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/benkipnis/virtual_engineer/agents-md/github.svg)](https://agentmods.dev/instructions/benkipnis/virtual_engineer/agents-md)

Your own site

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

Per session 493 This file is loaded in full into every session.

When invoked 493 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	$0.00493	$0.00493
Opus 5.5	$0.00197	$0.00197
Sonnet 5.5	$0.00099	$0.00099
Haiku 4.5	$0.00049	$0.00049

Measured 2mo ago against content hash 36096f2158d5, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

virtual_engineer 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 · 56 lines

How it starts

The opening of the file, as written. The whole thing — 56 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Agent Instructions — Virtual Engineer

This repository is a runnable Virtual Engineer demo: MCP retrieval server, LLM agent, React UI, and Atlas sample data. It is not a generic toolkit.

Repository layout

Path	Purpose
`backend/src/`	Express server — MCP tools, LLM agent, SSE chat API
`backend/src/mcp/createServer.js`	20 MCP tool definitions
`backend/src/agent/`	LLM orchestrator + MCP HTTP client
`backend/src/repositories/`	MongoDB data access layer
`frontend/src/`	Demo UI — Overview, Evidence Board, Field Chat
`scripts/data/`	Sample data, schemas, seed scripts
`tests/connectivity/`	MCP smoke tests
`docs/`	Architecture, runbook, gates, phase status

Local Cursor configuration

.cursor/ (rules and skills) is gitignored and kept locally for agent-assisted development. It is not part of the published repository.

Key workflows

Run and test

npm run mcp:dev                    # backend on :3100
npm run test:connectivity          # requires server running
cd frontend && npm run dev         # UI on :5173

Data changes

Edit scripts/data/samples/, then npm run seed:drop. See scripts/data/README.md.

Add or change MCP tools

Implement repository function in backend/src/repositories/
Register tool in backend/src/mcp/createServer.js with query_insight metadata
Extend smoke tests in tests/connectivity/

UI changes

Follow single-page multi-tab layout in frontend/src/. Both demo tabs share ChatContext SSE events.

Design principles

Deterministic first — resolve asset and operational facts before knowledge/case search
Real LLM agent — no scripted tool sequences in demo paths
Transparency — surface query_insight (pattern, collection, pipeline) in the UI
No customer branding — use generic OEM terminology in sample data and docs

Compliance artifacts

Maintain docs/gates.md and docs/phase-status.md when closing build phases.

Read the full file on GitHub · 56 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 · 56 lines · 493 tokens per session scan A 36096f2158d5

Subscribe to this mod's changes

virtual_engineer AGENTS.md is an instructions file published in the GitHub repository benkipnis/virtual_engineer (1 stars, last pushed 2mo ago), licensed MIT. It adds 493 tokens to every session, about $0.0020 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.

LLM agentic-ai demo mcp mongodb-atlas

virtual_engineer AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
virtual_engineer AGENTS.mdbenkipnis/virtual_engineer	Instructions file	1	2mo ago	MIT	A	493	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

virtual_engineer: Instructions file for Codex