Gdharness

gdharness

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An agent cannot see a running game. It reads your scripts and guesses at the rest: whether the button is on screen, whether the panel updated, whether that error mattered.

gdharness is an MCP server and four Godot addons. Through them the agent asks the open editor and the running game what the screen says and where a control is. It can also ask what a property holds now, what the console printed, and what broke on which line.

Install

Hand this to your agent:

Install gdharness here by following https://aureliolo.github.io/gdharness/agent.md,then tell me what it asked you to recommend back to me.

Or do it yourself, and pick your harness: aureliolo.github.io/gdharness.

The loop it exists for

editor_run      { "op": "start", "projectPath": "C:/games/shop" }runtime_inspect { "op": "find", "says": "Buy" }              // the button, by the word on itruntime_input   { "op": "click", "nodePath": "/root/Shop/Ledger/BuyButton" }runtime_inspect { "op": "text", "nodePath": "/root/Shop/Ledger" }   // what the panel says noweditor_output   { "projectPath": "C:/games/shop" }           // errors and warnings, with backtraces

The open editor plays the game, so you can set a breakpoint and read the variables in scope when it stops.

Writes answer with what the engine holds afterwards, never an echo of the request. A tool that cannot answer says which state it is in and what would change it.

At a glance

Godot before 4.7 is not tested.

Documentation

aureliolo.github.io/gdharness: installing it, how the parts connect, and every tool, op and argument.

SECURITY.md is how to report a security fault. CONTRIBUTING.md is what a change has to clear.

Project

Fork of GoPeak v2.3.9, September 2026, MIT. The original MCP server is godot-mcp by Solomon Elias, and GoPeak is by HaD0Yun.

Not affiliated with the Godot Foundation.