What is godot-stagehand CLAUDE.md?

Development instructions for Godot Stagehand, a Go server and Godot add-on for controlling and testing games from outside the game. It covers the project structure, commands, scenarios, screenshots, and connections.

Use it when building, running, testing, linting, or changing Godot Stagehand automation and its game add-on.

It explains how the server, game add-on, test scenarios, and visual comparisons fit together, reducing guesswork when modifying the project.

How mrf/godot-stagehand configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to mrf/godot-stagehand. 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/mrf/godot-stagehand/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/mrf/godot-stagehand

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/mrf/godot-stagehand/claude-md/github.svg)](https://agentmods.dev/instructions/mrf/godot-stagehand/claude-md)

Your own site

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

Per session 803 This file is loaded in full into every session.

When invoked 803 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	$0.00803	$0.00803
Opus 5.5	$0.00321	$0.00321
Sonnet 5.5	$0.00161	$0.00161
Haiku 4.5	$0.00080	$0.00080

Measured 2mo ago against content hash 103d28daff34, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

godot-stagehand 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 · 71 lines

How it starts

The opening of the file, as written. The whole thing — 71 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Godot Stagehand

MCP server (Go) + Godot addon (GDScript) for external game automation and testing.

Architecture

main.go — entry point. No arguments = MCP stdio server (hard compatibility contract); any argument dispatches to setup, --version, or internal/cli
internal/mcpserver/ — MCP server, tool handlers
internal/cli/ — CLI frontend: one-shot commands + run <scenario>. A sibling of mcpserver, not built on it
internal/scenario/ — scenario model, validation, runner, JSON/JUnit/trace reporters — see docs/cli.md
internal/gwpop/ — shared action registry: action name → GWP method + validated params, typed failure kinds, the blocked-method list. Used by cli/scenario; mcpserver deliberately does not route through it
internal/visual/ — screenshot decode, baselines, pixel diff (shared by mcpserver and scenario)
internal/godotconn/ — WebSocket connection to Godot addon
internal/selector/ — Selector parsing and validation
addons/stagehand/ — GDScript addon (WebSocket server inside the game); the only authoritative copy — see docs/addon-sync-contract.md before editing testdata/test_project/addons/stagehand or examples/minimal-game/addons/stagehand directly
testdata/test_project/ — Minimal Godot project for integration tests

Build & Run

go build -o godot-stagehand .     # build
go run .                           # run

Test

go test ./...                      # all tests (no Godot needed)
go test ./internal/selector/       # selector tests only

# Real-Godot scenario runner gate (mirrors CI's scenario-smoke job)
GODOT_BIN=/path/to/godot go test -tags=godot -run '^TestScenarioRunner' .

Lint

go vet ./...

Conventions

Go: standard library style, internal/ for non-exported packages
GDScript: static typing, GDScript style guide, GdUnit4 for tests
WebSocket port: 26700 (configurable)
Activation guard: STAGEHAND_ENABLED=1 or --stagehand CLI flag
Protocol: JSON-RPC 2.0 over WebSocket (Godot Wire Protocol), version-negotiated at ping
Versions: internal/version/version.go is authoritative; bump with ./scripts/set-version.sh — see docs/versioning.md

Read the full file on GitHub · 71 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 · 71 lines · 803 tokens per session scan A 103d28daff34

Subscribe to this mod's changes

godot-stagehand CLAUDE.md is an instructions file published in the GitHub repository mrf/godot-stagehand (9 stars, last pushed 7d ago), licensed MIT. It adds 803 tokens to every session, about $0.0032 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.

Game development game-testing gdscript godot godot-addon godot-engine mcp

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godot-stagehand: Instructions file for Claude Code