# Application interfaces

Structure operations, service relationships and approved metadata for applications.

## Repositories for this capability

Choose an implementation and open its source and README to get started.

[zixcel-contracts](https://github.com/zixcel/zixcel-contracts) — Give integrations a shared vocabulary for requests and results so callers can validate service boundaries.

[zixcel-interaction](https://github.com/zixcel/zixcel-interaction) — Describe resource reads, actions and state changes with typed requests and explicit results.

[zixcel-topology-api](https://github.com/zixcel/zixcel-topology-api) — Serve a bounded metadata view of registered service, organization and deployment relationships.

[zixcel-mcp-gateway](https://github.com/zixcel/zixcel-mcp-gateway) — Expose reviewed metadata through a validated, bounded MCP interface.

[japan-administrative-areas](https://github.com/zixcel/japan-administrative-areas) — Exact Japanese subdivision codes and names without product role policy

## Read the setup instructions

Each repository README describes prerequisites, interfaces and examples.

[zixcel-contracts — README](https://github.com/zixcel/zixcel-contracts/blob/main/README.md)

[zixcel-interaction — README](https://github.com/zixcel/zixcel-interaction/blob/main/README.md)

[zixcel-topology-api — README](https://github.com/zixcel/zixcel-topology-api/blob/main/README.md)

## Explore other capabilities

Browse related capabilities and the full library.

[Explore capabilities](https://zixcel.com/capabilities)

[All libraries](https://zixcel.com/oss)

Canonical: https://zixcel.com/capabilities/interaction