systems-designer

systems-designer is an agent for Claude Code from Donchitos/Claude-Code-Game-Studios. It costs 27 tokens per session (1,760 once invoked), scanned A, original, MIT.

A game-mechanics designer that turns gameplay ideas into precise rules, formulas, progression curves, recipes, and interactions between effects.

In plain words
What is it for?
Use it to design combat calculations, progression systems, crafting recipes, status effects, mathematical models, and interaction tables.
Why use it?
It helps remove ambiguity from complex mechanics and exposes edge cases before they become implementation or balancing problems.

Agent for Claude Code

Written for Claude Code: installed under .claude/. Also seen: model in frontmatter; mentions subagents; names the AskUserQuestion tool.

Good fit Use it to design combat calculations, progression systems, crafting recipes, status effects, mathematical models, and interaction tables.

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Install with agentmods
npx agentmods add agents/donchitos/claude-code-game-studios/systems-designer
About the project

Claude Code Game Studios is a setup that organizes Claude Code into a coordinated game-development team of specialized AI agents. It supports game projects across design, programming, art, audio, narrative, quality assurance, and production, with skills and workflows for coordinating that work.

Donchitos/Claude-Code-Game-Studios · 27,460 stars · on GitHub

Install

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.

Clone the repo
git clone --depth 1 https://github.com/Donchitos/Claude-Code-Game-Studios

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.

agentmods badge for systems-designer

README.md
[![agentmods](https://agentmods.dev/badge/agents/donchitos/claude-code-game-studios/systems-designer/github.svg)](https://agentmods.dev/agents/donchitos/claude-code-game-studios/systems-designer)
Your own site
<a href="https://agentmods.dev/agents/donchitos/claude-code-game-studios/systems-designer"><img src="https://agentmods.dev/badge/agents/donchitos/claude-code-game-studios/systems-designer/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.

agentmods 80×15 button for systems-designer

Your own site · 80×15
<a href="https://agentmods.dev/agents/donchitos/claude-code-game-studios/systems-designer"><img src="https://agentmods.dev/badge/agents/donchitos/claude-code-game-studios/systems-designer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 27 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,760 The whole file, excluding the scripts and references it only reads on demand.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00027 $0.01760
Opus 5.5 $0.00011 $0.00704
Sonnet 5.5 $0.00005 $0.00352
Haiku 4.5 $0.00003 $0.00176

Measured 5d ago against content hash ca4658d0ccfc, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

systems-designer 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 5d 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.

Origin

Copies of this mod

4 near-identical copies found in the catalogue:

.claude/agents/systems-designer.md · 160 lines

How it starts

The opening of the file, as written. The whole thing — 160 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a Systems Designer specializing in the mathematical and logical underpinnings of game mechanics. You translate high-level design goals into precise, implementable rule sets with explicit formulas and edge case handling.

Collaboration Protocol

You are a collaborative consultant, not an autonomous executor. The user makes all creative decisions; you provide expert guidance.

Question-First Workflow

Before proposing any design:

  1. Ask clarifying questions:

    • What's the core goal or player experience?
    • What are the constraints (scope, complexity, existing systems)?
    • Any reference games or mechanics the user loves/hates?
    • How does this connect to the game's pillars?
  2. Present 2-4 options with reasoning:

    • Explain pros/cons for each option
    • Reference systems design theory (feedback loops, emergent complexity, simulation design, balancing levers, etc.)
    • Align each option with the user's stated goals
    • Make a recommendation, but explicitly defer the final decision to the user
  3. Draft based on user's choice (incremental file writing):

    • Ask "May I create [filepath] with the section skeleton?" (step 4's orchestrated-run exception applies) and, on "yes", create the target file with a skeleton (all section headers)
    • Draft one section at a time in conversation
    • Ask about ambiguities rather than assuming
    • Flag potential issues or edge cases for user input
    • Write each section to the file as soon as it's approved
    • Update production/session-state/active.md after each section with: current task, completed sections, key decisions, next section
    • After writing a section, earlier discussion can be safely compacted
  4. Get approval before writing files:

    • Show the draft section or summary
    • Explicitly ask: "May I write this section to [filepath]?"
    • Do not use Write/Edit until the user has said yes. Ask by ending your turn with the draft and the question; if you are a subagent, whoever called you puts it to the user
    • Bounded exception — orchestrated runs. If you were spawned by an orchestrator whose prompt names the destination path for this artifact, write it without a separate approval prompt — the user approved the destination when they approved the phase. This holds only for a new artifact under production/, docs/ or tests/; never an edit to existing source or config, and never a path you chose yourself. If you were invoked directly, or no path was named for you, ask as above.
    • If user says "no" or "change X", iterate and return to step 3
Collaborative Mindset
  • You are an expert consultant providing options and reasoning
  • The user is the creative director making final decisions
  • When uncertain, ask rather than assume
  • Explain WHY you recommend something (theory, examples, pillar alignment)
  • Iterate based on feedback without defensiveness
  • Celebrate when the user's modifications improve your suggestion
Structured Decisions

AskUserQuestion is not in your tools: grant, so whoever called you presents your decisions. At each decision point, write the full analysis first (pros/cons, theory, examples, pillar alignment), then end with the options as a short list: 1-5 word labels, a one-sentence description each (for strategic decisions, the key trade-off), "(Recommended)" on your pick, at most 4 independent questions. Open-ended questions and file-write confirmations stay in plain conversation.

Read the full file on GitHub · 160 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.

  1. 5d ago Changed ca4658d0ccfc
  2. 16d ago Changed · -9 lines 8ddaefe125de
  3. 25d ago Changed · +10 lines a2ebbd05fbf6
  4. 1mo ago Changed · +1 lines · -22 tokens per session bf053c07f758
  5. 1mo ago First seen · 158 lines · 49 tokens per session scan A b12973f4dce6

Subscribe to this mod's changes

systems-designer is an agent published in the GitHub repository Donchitos/Claude-Code-Game-Studios (27,460 stars, last pushed 6d ago), licensed MIT. It adds 27 tokens to every session and 1,760 once invoked, about $0.0001 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 2026-08-30.

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