What is go-dev-mcp CLAUDE.md?

Repository instructions for GoDevMCP, a server that gives coding agents tools for Go development. They describe the project structure and the commands used to build, run, test, format, lint, install, and debug it.

Building and installing the GoDevMCP program, running its tests and code checks, starting it, and inspecting its MCP tools during development.

They give an agent the project-specific steps needed to work safely and check whether changes are sound. This avoids guessing commands or overlooking the repository's quality checks.

How fpt/go-dev-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to fpt/go-dev-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/fpt/go-dev-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/fpt/go-dev-mcp

Made for: Claude Code.

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/fpt/go-dev-mcp/claude-md/github.svg)](https://agentmods.dev/instructions/fpt/go-dev-mcp/claude-md)

Your own site

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

Per session 573 This file is loaded in full into every session.

When invoked 573 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	$0.00573	$0.00573
Opus 5.5	$0.00229	$0.00229
Sonnet 5.5	$0.00115	$0.00115
Haiku 4.5	$0.00057	$0.00057

Measured 2mo ago against content hash 96898b052e55, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

go-dev-mcp CLAUDE.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.

CLAUDE.md · 70 lines

How it starts

The opening of the file, as written. The whole thing — 70 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

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

Essential Commands

Build and Install

make build    # Build the application to output/godevmcp
make install  # Install to $GOPATH/bin/godevmcp

Testing and Quality

make test     # Run all unit tests with verbose output
make fmt      # Format code using gofumpt and golangci-lint
make lint     # Run golangci-lint for code quality checks

Development

make run      # Run the application in serve mode
make inspect  # Run with MCP inspector for debugging

Architecture Overview

GoDevMCP is a Model Context Protocol (MCP) server that provides Go development tools. The architecture follows clean architecture principles:

Core Components

main.go: Entry point using Google's subcommands pattern
internal/subcmd/: Subcommand implementations (serve, tree, datetime, etc.)
internal/mcptool/: MCP tool handlers and registration
internal/app/: Core business logic for each tool
internal/infra/: Infrastructure services (filesystem, GitHub API, HTTP client)
internal/repository/: Data access layer implementations

MCP Tools Architecture

The server registers multiple tools in internal/mcptool/register.go:

get_current_datetime: Current date/time
run_make: Execute make targets with intelligent output filtering
tree_dir: Directory structure visualization
search_godoc/read_godoc: Go documentation tools
search_github_code/get_github_content/tree_github_repo: GitHub integration
search_local_files: Local file content search

Key Patterns

Each tool has a handler in internal/mcptool/ that delegates to business logic in internal/app/
Infrastructure concerns are abstracted through interfaces in internal/repository/
Subcommands provide CLI access to tools for testing/debugging
The server supports both stdio and SSE modes for different MCP clients

Read the full file on GitHub · 70 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 · 70 lines · 573 tokens per session scan A 96898b052e55

Subscribe to this mod's changes

go-dev-mcp CLAUDE.md is an instructions file published in the GitHub repository fpt/go-dev-mcp (13 stars, last pushed 3d ago), licensed MIT. It adds 573 tokens to every session, about $0.0023 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.

vscode buildNext.instructions.md

Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).

microsoft/vscode · 9,715 tokens

go-dev-mcp: Instructions file for Claude Code