What is mcp-go-starter AGENTS.md?

Repository instructions for a Go starter project that teaches how to build an MCP server. MCP, or Model Context Protocol, is a standard way for AI assistants to call tools and access data.

Use them when working on this Go project: download dependencies, build the code, run tests, check it with Go’s vet tool, format files, or start its standard-input or HTTP server.

They give a coding agent the project’s commands, structure, technologies, and operating rules in one place. This reduces guesswork when building, testing, formatting, or running the server.

How SamMorrowDrums/mcp-go-starter configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to SamMorrowDrums/mcp-go-starter. 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/SamMorrowDrums/mcp-go-starter/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/SamMorrowDrums/mcp-go-starter

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/sammorrowdrums/mcp-go-starter/agents-md/github.svg)](https://agentmods.dev/instructions/sammorrowdrums/mcp-go-starter/agents-md)

Your own site

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

Per session 1,131 This file is loaded in full into every session.

When invoked 1,131 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	$0.01131	$0.01131
Opus 5.5	$0.00452	$0.00452
Sonnet 5.5	$0.00226	$0.00226
Haiku 4.5	$0.00113	$0.00113

Measured 1mo ago against content hash 52c9193c16dd, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mcp-go-starter 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 1mo 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 · 150 lines

How it starts

The opening of the file, as written. The whole thing — 150 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

This file provides context for AI coding agents working in this repository.

Quick Reference

Task	Command
Install deps	`go mod download`
Build	`go build ./...`
Test	`go test -v ./...`
Vet	`go vet ./...`
Format	`gofmt -w .`
Format check	`gofmt -l .` (empty = OK)
Run (stdio)	`go run ./cmd/stdio`
Run (HTTP)	`go run ./cmd/http`

Project Overview

MCP Go Starter is a feature-complete Model Context Protocol (MCP) server template in Go using the official go-sdk. It demonstrates all major MCP features including tools, resources, resource templates, prompts, sampling, progress updates, and dynamic tool loading.

Purpose: Workshop starter template for learning MCP server development.

Technology Stack

Runtime: Go 1.26.8+
MCP SDK: github.com/modelcontextprotocol/go-sdk
HTTP Server: net/http (stdlib)
Formatter: gofmt (built-in)

Project Structure

.
├── go.mod                      # Module definition
├── go.sum                      # Dependency checksums
├── Makefile                    # Build/run commands
├── .golangci.yml               # Linter configuration
├── cmd/
│   ├── stdio/
│   │   └── main.go             # stdio transport entrypoint
│   └── http/
│       └── main.go             # HTTP transport entrypoint
├── internal/
│   └── server/
│       └── server.go           # Main server (tools, resources, prompts)
├── .vscode/
│   ├── mcp.json                # MCP server configuration
│   ├── tasks.json              # Build/run tasks
│   ├── launch.json             # Debug configurations
│   └── extensions.json
└── .devcontainer/
    └── devcontainer.json

Build & Run Commands

# Download dependencies
go mod download && go mod tidy

# Build all binaries
go build ./...

# Run server (stdio transport)
go run ./cmd/stdio

# Run server (HTTP transport)
go run ./cmd/http
# With custom port: PORT=8080 go run ./cmd/http

Linting & Formatting

Read the full file on GitHub · 150 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.

1mo ago Changed · +2 tokens per session 52c9193c16dd
2mo ago First seen · 150 lines · 1,129 tokens per session scan A 1f42219bfebe

Subscribe to this mod's changes

mcp-go-starter AGENTS.md is an instructions file published in the GitHub repository SamMorrowDrums/mcp-go-starter (7 stars, last pushed 1mo ago), licensed MIT. It adds 1,131 tokens to every session, about $0.0045 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.

Building agents

mcp-go-starter AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
mcp-go-starter AGENTS.mdSamMorrowDrums/mcp-go-starter	Instructions file	7	1mo ago	MIT	A	1,131	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	today	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	today	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	275k	2d ago	MIT	A	4,313	Codex, OpenCode

mcp-go-starter: Instructions file for Codex