What is vector_mcp AGENTS.md?

Repository guidance for VectorMCP, a Ruby library for building Model Context Protocol servers that provide tools and data to language-model clients.

Use it when changing VectorMCP code, running its RSpec tests, checking style with RuboCop, or generating YARD documentation.

It gives coding agents the project's setup, testing, linting, and documentation commands so they can work consistently.

How sergiobayona/vector_mcp configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to sergiobayona/vector_mcp. 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/sergiobayona/vector_mcp/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/sergiobayona/vector_mcp

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/sergiobayona/vector_mcp/agents-md/github.svg)](https://agentmods.dev/instructions/sergiobayona/vector_mcp/agents-md)

Your own site

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

Per session 4,505 This file is loaded in full into every session.

When invoked 4,505 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	$0.04505	$0.04505
Opus 5.5	$0.01802	$0.01802
Sonnet 5.5	$0.00901	$0.00901
Haiku 4.5	$0.00451	$0.00451

Measured 2mo ago against content hash eb1db701ef6d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

vector_mcp 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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

vector_mcp CLAUDE.md — 89% identical, 31 lines differ

AGENTS.md · 600 lines

How it starts

The opening of the file, as written. The whole thing — 600 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

This file provides guidance to Codex (Codex.ai/code) when working with code in this repository.

Project Overview

VectorMCP is a Ruby gem implementing the Model Context Protocol (MCP) server-side specification. It provides a framework for creating MCP servers that expose tools, resources, prompts, and roots to LLM clients with comprehensive security features, structured logging, and production-ready capabilities.

Essential Commands

Development Setup

bin/setup          # Install dependencies and setup development environment
bin/console        # Interactive Ruby console with the gem loaded

Testing and Quality

rake               # Run default task (tests + linting)
rake spec          # Run RSpec test suite only
rake rubocop       # Run RuboCop linting only
bundle exec rspec          # Run RSpec test suite  
bundle exec rspec ./spec/vector_mcp/examples_spec.rb # run a single test file
bundle exec rspec ./spec/vector_mcp/logging_spec.rb # run logging tests
bundle exec rubocop       # Run RuboCop linting and style checks

Documentation

rake yard          # Generate YARD documentation
rake doc           # Alias for yard (outputs to doc/ directory)

Example Usage

# Getting Started Examples
ruby examples/getting_started/basic_http_stream_server.rb # MCP-compliant HTTP streaming

# Core Features Examples
ruby examples/core_features/authentication.rb        # Authentication demo
ruby examples/core_features/filesystem_roots.rb      # Filesystem boundaries
ruby examples/core_features/input_validation.rb      # Schema validation
ruby examples/core_features/cli_client.rb           # Command-line client

# Logging Examples
ruby examples/logging/basic_logging.rb              # Component-based logging
ruby examples/logging/structured_logging.rb         # JSON structured output
ruby examples/logging/security_logging.rb           # Security audit logging
ruby examples/logging/log_analysis.rb               # Log processing tools

# Use Cases Examples
ruby examples/use_cases/file_operations.rb          # File system operations
ruby examples/use_cases/data_analysis.rb            # Data processing workflows
ruby examples/use_cases/web_scraping.rb             # Content extraction

# Middleware Examples
ruby examples/middleware_examples.rb                # Comprehensive middleware demo
ruby examples/simple_middleware_demo.rb             # Basic middleware patterns

Read the full file on GitHub · 600 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 · 600 lines · 4,505 tokens per session scan A eb1db701ef6d

Subscribe to this mod's changes

vector_mcp AGENTS.md is an instructions file published in the GitHub repository sergiobayona/vector_mcp (13 stars, last pushed 20d ago), licensed MIT. It adds 4,505 tokens to every session, about $0.0180 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 2026-08-30.

Backend and APIs Languages Ruby mcp mcp-sdk mcp-server mcp-servers model-context-protocol model-context-protocol-servers

vector_mcp AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
vector_mcp AGENTS.mdsergiobayona/vector_mcp	Instructions file	13	20d ago	MIT	A	4,505	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

vector_mcp: Instructions file for Codex