Capability Index

This skill provides a decision framework for determining which platform capabilities a feature needs.

The Four Capabilities

Capability	Question to Ask	When to Use
Quota	What needs limits to prevent abuse?	Resource consumption
Insights	What can the platform detect that users can't?	Proactive issue detection
Telemetry	What do operators need to observe?	Debugging and SLOs
Activity	What actions need to be auditable?	Compliance and security

Decision Framework

Step 1: Identify the Feature Type

Feature Type	Likely Capabilities
New resource type	All four
New API operation	Activity, Telemetry
UI feature only	Telemetry (maybe)
Configuration change	Activity
Performance improvement	Telemetry

Step 2: Ask the Capability Questions

Quota Questions

•Can this resource be exhausted or abused?
•What is the natural unit to limit? (count, size, rate)
•What are sensible defaults for Free, Pro, Enterprise?
•How do consumers request more quota?

Skip quota if: The resource is inherently limited by other means or has no abuse potential.

Insights Questions

•What can go wrong that the platform can detect before users notice?
•What patterns indicate misconfiguration?
•What thresholds signal problems?
•What CEL conditions can identify issues?

Skip insights if: Issues are immediately obvious to users or no early warning is possible.

Note: Insights uses a policy-driven model—services define InsightPolicy resources with CEL expressions that detect issues. No code changes are required to emit insights.

Telemetry Questions

•What metrics indicate health?
•What traces help debug issues?
•What logs are needed for troubleshooting?
•What SLOs could be defined?

Skip telemetry if: The feature has no runtime behavior to observe.

Activity Questions

•What resource operations need to appear in activity timelines?
•How should create/update/delete operations be summarized for users?
•What controller events represent user-visible state changes?
•What compliance requirements apply?
•How will users access activity timelines? (CLI, UI, API)

Skip activity if: The action has no security or compliance implications.

Note: Activity uses a policy-driven model—services define ActivityPolicy resources that translate audit logs and Kubernetes events into human-readable summaries. No code changes are required to emit activities.

Read capability-activity/consuming-timelines.md for how to expose activity timelines to users via CLI, UI, or API.

Step 3: Document the Assessment

Use this template:

markdown

## Platform Capability Assessment

### Quota
- **Applies**: Yes/No
- **Rationale**: Why or why not
- **If yes**: Dimensions to limit, tier defaults

### Insights
- **Applies**: Yes/No
- **Rationale**: Why or why not
- **If yes**: InsightPolicy rules to create, CEL conditions to evaluate

### Telemetry
- **Applies**: Yes/No
- **Rationale**: Why or why not
- **If yes**: Metrics, traces, logs needed

### Activity
- **Applies**: Yes/No
- **Rationale**: Why or why not
- **If yes**:
  - Resource kinds needing policies
  - Events to emit from controller (reason codes)
  - Key operations to surface in timelines

Common Patterns

New Resource Type

Almost always needs all four:

•Quota: Limit on count or aggregate size
•Insights: Configuration validation, health checks
•Telemetry: CRUD metrics, reconciliation traces
•Activity: Event emission from controller + ActivityPolicy for create/update/delete/events

New Sub-Resource or Status

Usually needs:

•Telemetry: Status transition metrics
•Activity: Maybe (if security-relevant)

Usually skips:

•Quota: Covered by parent resource
•Insights: Covered by parent resource (usually)

New API Operation

Usually needs:

•Telemetry: Operation latency, success/failure
•Activity: If it mutates state

Usually skips:

•Quota: Unless operation consumes resources
•Insights: Unless operation can fail in detectable ways

Related Skills

•capability-quota — Detailed quota integration
•capability-insights — Detailed insights integration
•capability-telemetry — Detailed telemetry integration
•capability-activity — Detailed activity integration