Integration Evolution

Legato integrations usually do not fail because a single API is wrong. They fail because teams apply the wrong maturity model to the current risk surface.

This page explains a typical evolution path from semantics-first alignment to release-aware production operation.

Stage 1: Contract-first alignment

Early maturity is about semantic stability:

aligning on shared literals (events, states, capabilities, error codes),
treating snapshot and queue types as compatibility anchors,
and preventing app-layer semantic drift before runtime complexity is introduced.

At this stage, the integration question is “Do we agree on meaning?”, not “Can we play audio yet?”

Stage 2: Runtime integration

Once semantics are stable, maturity shifts to runtime behavior:

explicit setup ordering,
queue and playback command flow,
listener handling across playback and media-session events,
sync controller usage to keep local projection aligned with runtime state.

Here the key architectural move is preserving contract meaning while accepting runtime-dependent outcomes.

Stage 3: Production hardening

After runtime viability, the focus becomes operational confidence:

capability-gated UI and command paths,
explicit error handling on error.code,
validation of lifecycle paths on real device/runtime contexts,
reduction of hidden assumptions not guaranteed by the public model.

This stage is less about adding features and more about controlling behavioral risk.

Stage 4: Release-aware upgrades

Mature integrations treat upgrades as architecture events, not package chores:

check release notes before rollout planning,
validate compatibility and boundary assumptions,
re-check capability and event-driven flows after version changes,
preserve rollback and observability posture as part of the integration contract with your product.

The core principle is continuity: public contract anchors remain stable references while runtime behavior is re-validated per release.

Evolution is non-linear in real teams

Teams often move back and forth between stages:

a release may force new runtime checks,
a new product surface may reveal weak contract assumptions,
an incident may require renewed hardening on specific lifecycle edges.

That is expected. Maturity is a capability to revisit boundaries deliberately, not a one-time sequence completion.

How this connects to existing guidance

The architecture view here explains the “why” behind operational pages:

Golden Paths describe profile-based entry points,
Production Quickstart (Capacitor) demonstrates baseline runtime hardening flow,
Migration and Versioning covers upgrade execution checks,
Releases provides release-level evidence and upgrade context.

Use those pages for execution details; use this model to keep the long-term integration strategy coherent.