Borrowing it
Nothing to install: this file belongs to ouzlifaneyassine1-dot/onyx-engine. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/ouzlifaneyassine1-dot/onyx-engine/master/GEMINI.mdgit clone --depth 1 https://github.com/ouzlifaneyassine1-dot/onyx-engineWrote 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.
[](https://agentmods.dev/instructions/ouzlifaneyassine1-dot/onyx-engine/gemini-md)<a href="https://agentmods.dev/instructions/ouzlifaneyassine1-dot/onyx-engine/gemini-md"><img src="https://agentmods.dev/badge/instructions/ouzlifaneyassine1-dot/onyx-engine/gemini-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.
<a href="https://agentmods.dev/instructions/ouzlifaneyassine1-dot/onyx-engine/gemini-md"><img src="https://agentmods.dev/badge/instructions/ouzlifaneyassine1-dot/onyx-engine/gemini-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.01037 | $0.01037 |
| Opus 5 | $0.00518 | $0.00518 |
| Sonnet 5 | $0.00207 | $0.00207 |
| Haiku 4.5 | $0.00104 | $0.00104 |
Grade A, and why
onyx-engine GEMINI.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 9d 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.
How it starts
The opening of the file, as written. The whole thing — 56 lines — stays where its author put it; the contents beside it link to each section on GitHub.
onyx — Context Primer for Gemini
onyx is the AI game-dev studio for Onyx Engine — the AI-native game engine. When you see this file in a session, it means the user has installed the onyx Gemini extension and you have access to the onyx-engine MCP server plus onyx skills under the onyx: namespace.
What Onyx Engine is
A game engine designed for AI agents — editor, scene graph, asset pipeline, and runtime are all instrumented for programmatic control via MCP. Onyx Engine is compatible with Godot 4.6.3: projects use GDScript (.gd), C# (.cs), scenes (.tscn/.scn), and resources (.tres/.res). Write code in those languages; talk to the engine through onyx_* tools.
How to behave
Always check for a relevant onyx skill before writing code or running tools. Skills encode discipline that matters — debug protocols, scene-composition rules, GDScript idioms Gemini regularly gets wrong. If a skill might apply, even at 1% probability, activate it via activate_skill.
The single most important skill to know is onyx:using-onyx — it explains the workflow, priority, and the red-flag table of rationalizations the model needs to resist. Activate it first thing in any Onyx Engine session.
Skill priority
- Process skills first:
brainstorm-game,debug,play. These determine HOW. - Discipline skills second:
gdscript-patterns,scene-composition,art-direction,audio-direction. These shape content. - Build skills third:
fps-controller,design-mechanic,design-level,setup-multiplayer,vfx,tune-performance,export-and-ship.
MCP tools (when the engine is running on localhost:6550)
The onyx-engine MCP server exposes 44 focused tools. The most important:
- Scene mutation:
onyx_add_node,onyx_set_prop,onyx_set_resource_property,onyx_remove_node,onyx_save_scene,onyx_replace_node,onyx_batch. - Scene inspection:
onyx_get_scene_tree,onyx_inspect_node,onyx_inspect_resource. - Diagnostics:
onyx_get_script_errors(cheapest),onyx_get_diagnostics,onyx_get_console,onyx_get_debugger_errors,onyx_get_debugger_warnings. - Run game:
onyx_play,onyx_stop,onyx_is_running. - Project:
onyx_get_project_context,onyx_open_main_scene,onyx_project_setting,onyx_input_map_bind. - Assets:
onyx_search_assets,onyx_import_asset,onyx_import_from_url,onyx_generate_image,onyx_generate_3d,onyx_generate_audio,onyx_generate_video,onyx_check_job.
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.
- 9d ago First seen · 56 lines · 1,037 tokens per session scan A ecd275f5238f
onyx-engine GEMINI.md is an instructions file published in the GitHub repository ouzlifaneyassine1-dot/onyx-engine (0 stars, last pushed 2mo ago), licensed MIT. It adds 1,037 tokens to every session, about $0.0052 per session on Opus 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.
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