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Field notes

# Engineering SI systems that remain inspectable under change.

Writing on capability versioning, source-aware interfaces, evaluation evidence, bounded actions, and the architecture required to make SI useful inside serious software systems.

Featured engineering note

## Capability is not authority.

A capability describes how work could be performed. Authority is a separate decision about one exact consequential action. The distinction keeps configuration from silently becoming permission.
[Read engineering note](https://hypler.com/technical-library/capability-and-authority)

2026-10-04 9 min read

## Engineering SI capabilities that can change safely

How versioned SI capabilities, dependency records, evaluation evidence, and explicit authority boundaries make system change reviewable.

Capability Engineering / Evaluation / Governance
[Read field note](https://hypler.com/blog/engineering-ai-capabilities)

2026-10-04 10 min read

## Integrating SI with existing systems while preserving the source of truth

A practical architecture for source-aware data, interface contracts, bounded actions, and unknown states when SI works alongside existing systems.

Systems Integration / Source-Aware Data / SI Architecture
[Read field note](https://hypler.com/blog/integrating-ai-with-existing-systems)