measurable

# Measurable Makes "we shipped it" and "we can see it" the same statement. A change is only done when its impact is measurable and its regressions are visible — this skill decides what telemetry a diff needs, writes or audits it, and records a per-repo profile so the answer doesn't have to be re-derived every time. > **This `SKILL.md` is a thin index.** Detailed rules live in `rules/*.md` > and load on demand. The profile template lives in `templates/*.md`. > > **Composes, does not duplicate.** Frontend event design is > [`rum-tracking`](../../analysis/rum-tracking/SKILL.md)'s job — this skill > only decides *whether* a user-facing change needs RUM and hands off to it. > Backend span/metric semantic conventions belong to the `otel-instrumentation` > and `otel-semantic-conventions` skills (from the > [dash0 agent-skills repo](https://github.com/dash0hq/agent-skills)) when > installed — invoked via `Skill()`, skipped silently otherwise, with > [`rules/backend-instrumentation.md`](./rules/backend-instrumentation.md) as > the built-in fallback. Persistence for the Observability Profile is > [`persistent-memory`](../../authoring/persistent-memory/SKILL.md)'s > `project-shared` tier — this skill never invents its own storage layer. --- ## Mode Detection Parse `$1` as the mode. State the detected mode in one line before continuing. | Mode | Default | Trigger | | ----------- | ------- | --------------------...