HsienW
Registry indexed
type-boundary-contract
Design and review type contracts across package, service, frontend, backend, tool, event, and transport boundaries. Use when defining schemas, discriminated unions, runtime parsers, error envelopes, schemaVersion fields, or duplicated transport/domain types.
Overview
Design and review type contracts across package, service, frontend, backend, tool, event, and transport boundaries. Use when defining schemas, discriminated unions, runtime parsers, error envelopes, schemaVersion fields, or duplicated transport/domain types.
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Type Boundary Contract
Skill Interface
- Name: type-boundary-contract.
- Description: Design and review type contracts across package, service, frontend, backend, tool, event, and transport boundaries, including schemas, discriminated unions, runtime parsers, error envelopes, schemaVersion fields, and duplicated transport or domain types.
- Parameters: Boundary owner, producer and consumer types, domain and transport shapes, runtime parser, schema version, unknown-field behavior, error envelope, compatibility expectations, and contract test scenarios.
- Instructions: Use this skill before defining or changing cross-boundary types. Treat boundary types as runtime contracts, separate domain and transport types, validate external data on receipt, preserve compatibility, and test valid, invalid, unknown, and future-version payloads.
Types at a boundary are contracts. Compile-time TypeScript types do not validate runtime data from clients, servers, tools, providers, files, queues, or models.
Boundary Process
- Identify the boundary owner.
- Separate domain type from transport type.
- Define runtime validation at the receiving boundary.
- Define versioning and unknown-field behavior.
- Define error envelope shape.
- Add contract tests for both valid and invalid data.
- Document compatibility expectations before changing existing fields.
Type Rules
- Use discriminated unions for state, event, and result variants.
- Use
unknownfor external data until parsed. - Avoid
anyat boundaries. - Do not use type assertions to hide unvalidated data.
- Avoid optional fields when a union variant would model required state better.
- Keep stable machine identifiers separate from localized messages.
- Use explicit schema versions for structured cross-boundary payloads.
Generic Result Pattern
type BoundaryResult<TKind extends string, TStatus extends string, TData> = {
schemaVersion: string;
kind: TKind;
status: TStatus;
data?: TData;
summary?: string;
};
The producer may use narrow literal types. The consumer may accept wider compatible types when it must tolerate future versions.
Error Envelope
Use stable machine-readable fields:
type ErrorEnvelope = {
error: {
source: string;
stage: string;
code: string;
message: string;
retryable?: boolean;
details?: Record<string, unknown>;
};
};
Do not expose stack traces, private paths, tokens, secrets, or raw provider responses.
Compatibility Checklist
- Request schema.
- Response schema.
- Event schema.
- Tool input schema.
- Tool output schema.
- Error code and retryability.
- Terminal state.
- Correlation identifiers.
- Unknown fields and unknown variants.
- Migration or deprecation plan.
Verification
Test valid data, missing fields, unknown fields, unknown variants, invalid schema versions, error envelopes, and future-compatible payloads.
File metadata
name: type-boundary-contract description: Design and review type contracts across package, service, frontend, backend, tool, event, and transport boundaries. Use when defining schemas, discriminated unions, runtime parsers, error envelopes, schemaVersion fields, or duplicated transport/domain types.
View original text
---
name: type-boundary-contract
description: Design and review type contracts across package, service, frontend, backend, tool, event, and transport boundaries. Use when defining schemas, discriminated unions, runtime parsers, error envelopes, schemaVersion fields, or duplicated transport/domain types.
---
# Type Boundary Contract
## Skill Interface
- Name: type-boundary-contract.
- Description: Design and review type contracts across package, service, frontend, backend, tool, event, and transport boundaries, including schemas, discriminated unions, runtime parsers, error envelopes, schemaVersion fields, and duplicated transport or domain types.
- Parameters: Boundary owner, producer and consumer types, domain and transport shapes, runtime parser, schema version, unknown-field behavior, error envelope, compatibility expectations, and contract test scenarios.
- Instructions: Use this skill before defining or changing cross-boundary types. Treat boundary types as runtime contracts, separate domain and transport types, validate external data on receipt, preserve compatibility, and test valid, invalid, unknown, and future-version payloads.
Types at a boundary are contracts. Compile-time TypeScript types do not validate
runtime data from clients, servers, tools, providers, files, queues, or models.
## Boundary Process
1. Identify the boundary owner.
2. Separate domain type from transport type.
3. Define runtime validation at the receiving boundary.
4. Define versioning and unknown-field behavior.
5. Define error envelope shape.
6. Add contract tests for both valid and invalid data.
7. Document compatibility expectations before changing existing fields.
## Type Rules
- Use discriminated unions for state, event, and result variants.
- Use `unknown` for external data until parsed.
- Avoid `any` at boundaries.
- Do not use type assertions to hide unvalidated data.
- Avoid optional fields when a union variant would model required state better.
- Keep stable machine identifiers separate from localized messages.
- Use explicit schema versions for structured cross-boundary payloads.
## Generic Result Pattern
```ts
type BoundaryResult<TKind extends string, TStatus extends string, TData> = {
schemaVersion: string;
kind: TKind;
status: TStatus;
data?: TData;
summary?: string;
};
```
The producer may use narrow literal types. The consumer may accept wider
compatible types when it must tolerate future versions.
## Error Envelope
Use stable machine-readable fields:
```ts
type ErrorEnvelope = {
error: {
source: string;
stage: string;
code: string;
message: string;
retryable?: boolean;
details?: Record<string, unknown>;
};
};
```
Do not expose stack traces, private paths, tokens, secrets, or raw provider
responses.
## Compatibility Checklist
- Request schema.
- Response schema.
- Event schema.
- Tool input schema.
- Tool output schema.
- Error code and retryability.
- Terminal state.
- Correlation identifiers.
- Unknown fields and unknown variants.
- Migration or deprecation plan.
## Verification
Test valid data, missing fields, unknown fields, unknown variants, invalid
schema versions, error envelopes, and future-compatible payloads.
Review the source
Price & running costs
- Get the skill
- Price unconfirmed
- Run it
- Requirements have not been confirmed. Check the source for agent, API and service charges.
- License
- MIT
- Price unconfirmed
- We have not confirmed a price for this skill. Existing source and install links remain available.
Free to get does not mean free to run. Price labels are not safety ratings. Submit pricing information →
Skill source recorded
Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.
Review before install: Avoid automatic install
License: MIT
- Dependency or permission surface needs review
- Permission surface may require sandboxing
- Low GitHub adoption signal
- AI review approval is missing
- Quality score needs review
- Permission surface needs review: secrets or environment access, shell or command execution
- GitHub adoption: 28 GitHub stars
- Stars/forks activity: 28 stars, 0 forks; issue activity unavailable in current metadata
- Dependency/runtime risk: command execution surface, credential or environment access
- Permission surface: secrets or environment access, shell or command execution
- Review status: AI review approval is missing
Listed tools are metadata hints, not tested compatibility. Agent prompts are suggested handoffs.
Start with one small task
- 1Read the source. Confirm the input, expected output, dependencies and permissions.
- 2Ask your agent for a plan. Approve setup and any costs before running a small isolated test.
- 3Check the output and changed files. Report only what actually ran; keep the source revision for reproduction.
Check the source for dependencies, API keys and third-party costs. A public repository does not mean every service is free.
Source & usage notes
IndexedStatic Checked
Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.
- Source repository
- HsienW/ai-agent-engineering-playbook
- License
- MIT
- Version
- Unknown
- Last GitHub push
- Sep 6, 2026
- Registry updated
- Sep 12, 2026
Version reported in registry metadata; check source releases before relying on it.
Quality
56/100
Promising
Trust
60/100
Sandbox only
Audit
72/100
Needs review
- Dependency or permission surface needs review
- Permission surface may require sandboxing
- Low GitHub adoption signal
- AI review approval is missing
- Quality score needs review
- Permission surface needs review: secrets or environment access, shell or command execution
- GitHub adoption: 28 GitHub stars
- Stars/forks activity: 28 stars, 0 forks; issue activity unavailable in current metadata
- Dependency/runtime risk: command execution surface, credential or environment access
- Permission surface: secrets or environment access, shell or command execution
- Review status: AI review approval is missing
- Verified installs
- —
- Outcomes
- —
Copies are not installs. Installation counts require a reported successful installation; they are not a blanket quality guarantee.
Agent access
This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.
More details
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}For the creator
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