aztecprotocol/aztec-private-escrow-skills/scaffold-escrow-project

Scaffold Aztec Private Escrow Project

Create a contracts + TypeScript SDK project for Aztec private escrows. The default preset is an OTC atomic onchain settlement, but adapt it for other escrow shapes while preserving secret deployment, contract-owned shared private state, explicit roles, and phase-driven lifecycle state.

Prerequisites

• Aztec CLI 5.1.0
• Bun
• Localnet on http://localhost:8080 for tests: aztec start --local-network

Load References As Needed

• references/design-intake.md - phase/timing/config-state questions for fresh or ambiguous designs.
• references/private-state-and-handoff.md - contract secret key, shared private notes, role-secret boundary.
• references/secret-contracts.md - deploying with the publicKeys instantiation option, secret key registration, participant handoff.
• references/lifecycle-phases.md - OPEN, VOID, ACCEPTED, SETTLEMENT_IN_PROGRESS, FILLED.
• references/manifest-schema.md - minimal escrow manifest and encrypted transport.
• references/testing-strategy.md - Bun/localnet test layout and required cases.
• references/escrow-design-space.md - choosing a non-OTC escrow shape.

For Noir/Aztec behavior, use the Aztec developer and Noir developer companion skills when available.

Intake Rule

Before scaffolding a fresh project or changing lifecycle/config/state shape, load references/design-intake.md. A project is fresh when the target directory is missing, or it lacks packages/contracts/Nargo.toml and packages/contracts/src/main.nr.

For a fresh project, say once: This skill is best used in Plan mode first. If the user declines Plan mode, continue with explicit conservative assumptions.

Scaffold Workflow

1. Create the target directory. If .git is missing, run git init before dependency install because deps/aztec-standards is a submodule.
2. Copy templates/project/ into the target, including dotfiles.
3. Register the submodule with git, not by writing .gitmodules alone. The pin is a tag, so add the submodule on the default branch and let scripts/token.ts check out the pinned tag:

git submodule add --force https://github.com/AztecProtocol/aztec-standards.git deps/aztec-standards

1. Adapt package names and imports. Use a scoped contracts package such as @aztec-otc-desk/contracts; update both packages/contracts/package.json and packages/contracts/tsconfig.json paths.
2. Adapt Noir files in templates/project/packages/contracts/src/ and TS SDK files in templates/project/packages/contracts/ts/src/ for the requested escrow.
3. Run bun install; the root postinstall builds/copies the aztec-standards token artifact.
4. Build from packages/contracts with bun run build.

Do not scaffold an API, CLI, orderflow service, frontend, or runnable demo app for now.

Template Map

• templates/project/ - canonical scaffold files, including package files, scripts, Noir source, TS SDK, and Bun setup shim.
• ../write-escrow-contract/templates/contract-template.md - how to adapt the real Noir contract files.
• ../write-escrow-contract/templates/config-note-template.md - immutable config rules.
• ../write-escrow-contract/templates/state-note-template.md - required mutable lifecycle state rules.
• ../write-escrow-contract/templates/order-filled-event-template.md - required fill receipt event.
• ../write-escrow-contract/references/role-restriction-patterns.md - caller-sampled role secrets and RoleAdded recovery events.
• ../write-escrow-contract/references/token-primitive-adapters.md - selected-token private transfer/commitment mapping.

Testing Scope

Generated projects use TypeScript/Bun tests only. Keep package.json free of Aztec.nr/TXE scripts.

The contracts package test script must stay targeted:

"test": "bun test --preload ./ts/test/setup.ts --timeout 300000 ./ts/test/escrow.test.ts"

Do not let Bun recursively discover deps/aztec-standards tests. Do not add escrow.test.ts from this skill until the user provides the current generated example.

When generating tests, keep the test cases in packages/contracts/ts/test/escrow.test.ts, but put reusable helpers in packages/contracts/ts/test/utils/utils.ts. If utilities grow large, split additional files under packages/contracts/ts/test/utils/ and re-export them from utils.ts.

Documentation Style

Document generated code aggressively. Above every generated function, class method, exported type helper, and test utility, use full JSDoc with a description, blank line, @param for each parameter, and @returns for non-void returns:

/**
 * Description here.
 *
 * @param x - Parameter description.
 * @returns Return value description.
 */

Inside longer functions/tests, mark each logical phase with step comments, for example // Step 1: Fund maker asset into escrow during construction. Comments should explain protocol intent, privacy assumptions, and why the step exists, not restate single-line syntax.

Non-Negotiables

1. Target Aztec 5.1.0, Bun, EmbeddedWallet, workspace catalog pinning, package imports, and NodeNext .js suffixes.
2. Generate contracts, TypeScript SDK, and TypeScript/Bun tests only.
3. Use secret contract handoff through EscrowManifest: address, serialized instance, required contract secret key, creation block, optional tx hash.
4. Use contract-owned ConfigNote/StateNote with storage owner self.address; do not add manual note owner or randomness fields.
5. Use caller-sampled role secrets and caller-bound pseudonyms; emit RoleAdded { secret } to the caller only.
6. Use constructor funding plus StateNote for all phase/cancel/fill state and avoid custom fill/funding nullifiers by default.
7. Emit OrderFilled { filled: true } on every fill; add extra payload fields only when intake explicitly confirms event-carried data.