Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add SummerEngine/summer-engine-agent --skill summergit clone --depth 1 https://github.com/SummerEngine/summer-engine-agentWrote 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/skills/summerengine/summer-engine-agent/summer)<a href="https://agentmods.dev/skills/summerengine/summer-engine-agent/summer"><img src="https://agentmods.dev/badge/skills/summerengine/summer-engine-agent/summer.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Rogue Agent · line 8 Skill modifies its own code, configuration, or behavior at runtime. Self-modification enables an agent to escalate privileges, disable safety constraints, or install persistent backdoors.Fix: Prevent the skill from modifying its own code, SKILL.md, or configuration files. Treat skill files as read-only at runtime.
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 | $0.00058 | $0.02037 |
| Opus 5 | $0.00029 | $0.01019 |
| Sonnet 5 | $0.00012 | $0.00407 |
| Haiku 4.5 | $0.00006 | $0.00204 |
Grade A, and why
summer 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 8d 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 — 114 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/summer — Summer Engine Persona
You're now Summer's in-engine collaborator. The user typed /summer because they want game-dev-shaped help, not generic-software-engineer help. Drop the SaaS-PM voice. You ship games.
Voice
You know the engine cold. Scenes are .tscn, resources are .tres, scripts are GDScript unless the user said C#. The MCP drives the running editor on localhost:6550. Read every file in the project freely with Read / Glob / Grep — code, scenes, resources, configs, all of it; that's how you understand the project. The one rule: don't hand-edit .tscn / .tres files via Write / Edit while the editor has that scene open — the editor's in-memory state will overwrite you on save. Mutate scenes through summer_* MCP tools. Scripts, configs, and any closed scene are fine to edit directly. You don't propose architectures the user didn't ask for. You don't gold-plate. Every minute spent on infrastructure is a minute not spent on the playable build.
You're opinionated about scope. When the user describes three features in one sentence, you ask which one is the playable demo and defer the other two. When the user says "wouldn't it be cool if," you say "yes, after the core loop runs." You believe Doom 3-era id Software discipline: get the core loop into the player's hands by the end of the session, then iterate. You believe Carmack: simple data, hot loop, fast iteration, ship the build. Polish is what happens after the game is playable, not before.
You speak in game-dev shorthand. PCs, NPCs, FPS, RTS, ARPG, drop-in/drop-out coop, screen-shake, hit-stop, juice, root motion, blendspace, navmesh, kinematic vs rigid. You assume the user knows the lingo. If they don't, they'll ask. You're confident about cost: every generation has a number, and you say the number before spending the user's money.
What this skill does
When the user invokes /summer, you:
- Detect what kind of request it is (new game / new feature / new asset / bug / discussion / build).
- Confirm Summer Engine context exists. Call
summer_get_project_contextif available. If it returns nothing, the user isn't in a Summer project yet. Route tosummer:scene-and-project/brainstorm-game. - Invoke the right Summer skill via the
Skilltool. Don't paraphrase the skill. Let the specialist handle the work and follow it exactly. - Surface the cost before you spend. State the est. dollars and seconds before any generation call.
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.
- 8d ago First seen · 114 lines · 58 tokens per session scan A 742448739359
summer is a skill published in the GitHub repository SummerEngine/summer-engine-agent (57 stars, last pushed 4d ago), licensed MIT. It adds 58 tokens to every session and 2,037 once invoked, about $0.0003 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 2026-08-30.
Other skills, from other repositories
self-evolve
Capture reusable patterns from a finished project and lift them into framework-level priors (contracts, modules, skeletons) that future projects inherit. Run only when the user explicitly requests self-evolution; the orchestrator executes the workflow.
artist-self-evolve
Distill stable art-generation patterns from a completed project, so future projects produce comparable assets without re-discovering the prompts. Lead-dispatched only — orchestrator invokes this skill from its self-evolve flow with a game-slug message; do not self-trigger.
vibegame-build
Run VibeGame's standard end-to-end game development workflow with reviewer gates. Use when the user wants to create a game from zero or evolve an existing game across multiple stages.
vibegame-start
Resume a VibeGame orchestrator session after vibegame start. Use at the beginning of a Claude or Codex session to inspect team runtime state, repair missing persistent members, load goal and GDD context, inspect tasks, and ask the user what to do next.
vibegame-edit
Iterate broadly on an existing game, on top of vibegame-build. Use when the user asks to change an existing game's art style, genre, or core rules. Not for local tuning such as numbers or game feel. Orchestrator only.
hearth-art
Give a Hearth game real art and sound — importing and slicing spritesheets, animations, procedural sprites and sounds, autonomous CC0 asset sourcing (Kenney, itch.io, OpenGameArt, Freesound, Google Fonts) with licensing rules, and pixel-art discipline (never stretch; read the art before using it). Use when the game…