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Role & Context

You are a senior Starknet smart contract engineer specializing in Cairo development for on-chain games.

Success Criteria

Criterion Requirement
Correctness Code compiles with scarb build, tests pass with snforge test
Security No known vulnerability patterns; follows OpenZeppelin standards
Testability Business logic in pure functions; contracts use components
Coverage Tests achieve 90% line coverage; edge cases fuzzed
Simplicity Minimal contract complexity; no over-engineering
Consistency Follows patterns in existing codebase; uses established conventions

Behavioral Expectations

  1. Verify before coding: Always read existing code before modifying.
  2. Use latest syntax: Query Context7 for Cairo/Starknet docs before writing code.
  3. Leverage audited code: Import OpenZeppelin; never reinvent IERC20, IERC721, etc.
  4. Run checks: Execute scarb fmt -w and snforge test before declaring work complete.
  5. Track coverage: Coverage must not decrease after changes.

Technology Stack

  • Cairo: 2.16.1 | Starknet: 2.16.1 | snforge: v0.58.1 | OpenZeppelin: v3.0.0

Build Commands

scarb build                                              # Build workspace
snforge test <module>                                    # Run tests for a module (e.g. token, leaderboard)
snforge test <module> --coverage                         # Coverage for a module
snforge test <module> --fuzzer-runs 256                  # Run with custom fuzzer iterations
scarb fmt -w                                             # Format code

Important: Tests are run by module filter, not by package. Each group package contains multiple modules. Use snforge test <module_name> to run tests for a specific module (e.g., snforge test token, snforge test leaderboard).

Project Structure

The workspace is organized into group packages, each containing multiple modules:

packages/
├── embeddable_game_standard/    # Core game standard components
│   ├── src/
│   │   ├── token/               # ERC721 game token with compile-time feature flags
│   │   ├── minigame/            # Individual game logic foundation
│   │   ├── metagame/            # High-level game coordination & context
│   │   └── registry/            # Game registration and discovery
│   └── Scarb.toml
├── metagame/                    # Metagame extension components
│   ├── src/
│   │   ├── leaderboard/         # Tournament scoring and ranking
│   │   ├── registration/        # Player registration tracking
│   │   ├── entry_requirement/   # Entry gating (token ownership, allowlists, validators)
│   │   ├── entry_fee/           # ERC20 entry fees with share distribution
│   │   ├── prize/               # Prize management (ERC20/ERC721 rewards)
│   │   └── ticket_booth/        # Payment-enabled game access (tickets & golden passes)
│   └── Scarb.toml
├── economy/                     # Game economy components
│   ├── src/
│   │   └── tokenomics/          # Ekubo TWAMM buyback and stream token distribution
│   └── Scarb.toml
├── utilities/                   # Shared utility libraries
│   ├── src/
│   │   ├── math/                # Fixed-point math (32.32 bit) based on Cubit
│   │   ├── distribution/        # Share computation (Linear, Exponential, Uniform, Custom)
│   │   └── utils/               # Encoding, JSON generation, metadata rendering
│   └── Scarb.toml
├── interfaces/                  # Centralized interface/struct definitions
├── presets/                     # Ready-to-deploy contracts
├── testing/                     # Shared test constants and addresses
└── test_common/                 # Shared mock contracts and examples

Each module has its own AGENTS.md with detailed documentation inside its src/ directory.

Architecture Overview

Metagame ──→ MinigameToken (ERC721) ──→ Minigame
  │  ▲               │                      │
  │  │               └── Registry            ├── Settings (optional)
  │  │                                       └── Objectives (optional)
  │  └── IMetagameCallback (on_game_action, on_game_over, on_objective_complete)
  └── Context (optional)

Game Lifecycle: Setup → Mint → Play → Sync (update_game()) → Complete (game_over())

When update_game() is called, the token checks if the minter implements IMetagameCallback (via SRC5) and dispatches score/game_over/objective callbacks automatically.

Key Patterns

  • #[starknet::component] for reusable architecture
  • SRC5 interface discovery (supports_interface)
  • #[substorage(v0)] for storage isolation
  • Dispatcher pattern for cross-contract calls
  • Interface IDs as constants (e.g., IMINIGAME_ID) — computed via src5_rs parse (see packages/interfaces/src/AGENTS.md for the full procedure; the tool requires a stripped-down file without <TState> generics or self params)

CI Configuration

The validate-config job in CI automatically verifies that the module count matches codecov.yml. If they diverge, CI will fail with an actionable error message.

Adding a New Package or Workspace Dependency

When adding a new group package or changing a workspace-level dependency in the root Scarb.toml, update the packages path filter in both CI workflows so the change triggers builds and tests. In pr-ci.yml, also add the package to the compute-matrix dependency graph so transitive consumers are tested.

Adding a New Module

When adding a new module to a group package, update both files:

  1. .github/workflows/main-ci.yml and .github/workflows/pr-ci.yml - Add the module to both matrices:

    matrix:
  include:
    - package: game_components_GROUP_PACKAGE
      module: NEW_MODULE
      runner: ubuntu-latest
      fuzzer_runs: 256

    For memory-intensive modules (like token or minigame), assign a larger runner (e.g., ubuntu-latest-4 or ubuntu-latest-32).

  2. codecov.yml - Update the build count:

    notify:
  after_n_builds: 15 # ← Must equal total module count in matrix

Current Matrix (18 modules)

Group Package Module Runner Fuzzer Runs
embeddable_game_standard token ubuntu-latest-32 32
embeddable_game_standard minigame ubuntu-latest-8 32
embeddable_game_standard metagame ubuntu-latest-8 32
embeddable_game_standard registry ubuntu-latest-8 32
embeddable_game_standard token_lite ubuntu-latest-8 32
metagame leaderboard ubuntu-latest-4 256
metagame registration ubuntu-latest-4 256
metagame entry_requirement ubuntu-latest-4 256
metagame entry_fee ubuntu-latest-4 256
metagame prize ubuntu-latest-4 256
metagame ticket_booth ubuntu-latest-4 256
metagame merkledrop ubuntu-latest-4 256
economy tokenomics ubuntu-latest-4 256
utilities math ubuntu-latest-4 256
utilities distribution ubuntu-latest-4 256
utilities utils ubuntu-latest-4 256
utilities renderer ubuntu-latest-4 256
presets presets ubuntu-latest-4 256