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gdharness

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 makes the engine answerable instead. What the screen says, where a control is, what a property reads right now, what the console printed, what broke and on which line.

Install

Hand this to your agent:

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

The loop it exists for

The open editor plays the game, so its debugger holds it, which is what lets you set a breakpoint and read the variables in scope when it stops.

Every answer is read back out of the engine after the fact, never echoed from the request. A tool that cannot answer says which state it is in and what would change it, rather than answering emptily, so a call that succeeded is a call that was understood.

At a glance

| | |

| Needs | Godot 4.7 or newer, Node 22 or newer. Runs under Bun 1.4 too. | | Surface | 30 tools named domain_verb, 4 godot:// resources and 3 prompts | | Reaches | The editor that is open, a game it is playing, and the project on disk | | Harnesses | 35, written inside the project wherever the harness has a project config | | Skill | Written to .agents/skills, which every major harness reads | | Install | npm, or a Sigstore-signed archive with an SBOM, SLSA Build Level 3 | | Proven | Every tool driven against Godot 4.7.2 in CI, on Windows, Linux and macOS | | Status | 1.0: every release is a patch. What a bump means |

Older 4.x is likely to work and 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 something. CONTRIBUTING.md is what a change has to clear.

Project

Fork of GoPeak v2.3.9, September 2026, MIT: the original MCP server godot-mcp by Solomon Elias, GoPeak by HaD0Yun, and completely reworked since to be hardened, condensed and more streamlined.

Not affiliated with the Godot Foundation.