Capability Layers & Interfaces

Purpose and scope

Make boundaries explicit so teams know where to plug in and scale safely.

Outcomes

• Documented APIs and SLAs per layer.
• Fewer implicit dependencies.
• Easier upgrades and ownership.

Signals of trouble

• Hidden cross-layer knowledge.
• Breaking changes without versioning.
• No clear owner for shared components.

Remediation steps

1. Map capability layers and assign owners.
2. Publish interfaces and SLAs; add contract tests.
3. Version capabilities; deprecate with timelines.

Checklists and assets

• playbooks/internal-platform-architecture/checklist.md mapping tasks.

References

• Reference architectures; ownership matrices.