What is go-mcp-specialist?

A coding guide for building MCP tools in Go. MCP, the Model Context Protocol, is a standard way for an AI agent to call tools, while JSON-RPC is the message format used for those calls.

Use it to add MCP tools, register them in a Go server, troubleshoot JSON-RPC or standard-input transport issues, and run the required code checks.

It helps avoid protocol errors and unsafe output when implementing or debugging tool handlers. It also defines how inputs, outputs, errors, logging, and registration should be structured.

How remiphilippe/mcp-unreal configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to remiphilippe/mcp-unreal. 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/remiphilippe/mcp-unreal/main/.claude/agents/go-mcp-specialist.md

Clone the repo

git clone --depth 1 https://github.com/remiphilippe/mcp-unreal

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/agents/remiphilippe/mcp-unreal/go-mcp-specialist/github.svg)](https://agentmods.dev/agents/remiphilippe/mcp-unreal/go-mcp-specialist)

Your own site

<a href="https://agentmods.dev/agents/remiphilippe/mcp-unreal/go-mcp-specialist"><img src="https://agentmods.dev/badge/agents/remiphilippe/mcp-unreal/go-mcp-specialist/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/agents/remiphilippe/mcp-unreal/go-mcp-specialist"><img src="https://agentmods.dev/badge/agents/remiphilippe/mcp-unreal/go-mcp-specialist.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 43 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 250 The whole file, excluding the scripts and references it only reads on demand.

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	$0.00043	$0.00250
Opus 5.5	$0.00017	$0.00100
Sonnet 5.5	$0.00009	$0.00050
Haiku 4.5	$0.00004	$0.00025

Measured 2mo ago against content hash 1c09c388c156, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

go-mcp-specialist 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/agents/go-mcp-specialist.md · 24 lines

What it actually says

You are an expert in the Model Context Protocol and its official Go SDK (github.com/modelcontextprotocol/go-sdk/mcp).

When implementing tools:

Input types use json + jsonschema struct tags
Output types are concrete structs, never interface{}
All handlers receive context.Context — propagate it
Errors use fmt.Errorf("doing X: %w", err) wrapping
Tool descriptions are 1-3 sentences: what, when, prerequisites
stdout is SACRED — never print to it. Use slog to stderr

When registering tools in main.go:

Group by domain (headless, editor, docs, status)
Tool names are snake_case, verb-first

Before writing code, use Context7 to check the latest MCP SDK API. Always run go vet and golangci-lint run after changes.

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 · 24 lines · 43 tokens per session scan A 1c09c388c156

Subscribe to this mod's changes

go-mcp-specialist is an agent published in the GitHub repository remiphilippe/mcp-unreal (81 stars, last pushed 8mo ago), licensed Apache-2.0. It adds 43 tokens to every session and 250 once invoked, about $0.0002 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 Building agents mcp-server unreal-engine unreal-engine-5

go-mcp-specialist next to 6 agents from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
go-mcp-specialistremiphilippe/mcp-unreal	Agent	81	8mo ago	Apache-2.0	A	43	Claude Code
FAI Dapr Expertfrootai/frootai	Agent	7	4d ago	MIT	A	37	Claude Code
FAI Deno Expertfrootai/frootai	Agent	7	4d ago	MIT	B	39	Claude Code
api-mappercogniplex/codemem	Agent	18	3mo ago	Apache-2.0	A	50	Claude Code
timps_ai_workflow_orchestratorSandeeprdy1729/timps-swarm	Agent	1	2mo ago	MIT	A	67	Claude Code
mcp-developeralexmmatos/arthur-mcp	Agent	2	3mo ago	MIT	A	39	Claude Code
php-proalexmmatos/arthur-mcp	Agent	2	3mo ago	MIT	A	50	Claude Code

mcp-unreal: Agent for Claude Code