v4.2 Release Readiness
This document records the readiness assessment for the v4.2 Gateway Foundation. v4.2.0 is published on npm and the public GitHub release is marked latest.
Scope Implemented
- Gateway protocol contracts and normalized error shapes.
- Runtime-readable provider, model, local-model, and routing-preset registries.
- Deterministic dry-run route planning and explanations.
- Resilience planning and simulation for retry, timeout, fallback, circuit-breaker, rate-limit, and quota scenarios.
- Localhost mock gateway runtime for
/health,/v1/models, and/v1/chat/completions. - Deterministic mock non-streaming and SSE streaming responses.
- Preview-only client integration plans.
- Bounded local in-memory observability, usage accounting, static cost estimates, metrics, provider health, and audit events.
Scope Explicitly Excluded
- External provider execution.
- Provider API key loading.
- Live provider retry or fallback.
- Provider SDKs.
- Remote binding by default.
- Persistent telemetry, logs, traces, or metrics databases.
- Complete OpenAI API compatibility.
- Third-party client execution.
- GitHub Packages mirroring.
Security Review
Current mitigations include loopback defaults, explicit authentication requirements for non-local binding, bounded request bodies, bounded stream timeouts, normalized errors, redacted observability, URL safety checks for provider metadata, preview-only client plans, and zero runtime dependencies.
Residual risks remain around future external provider execution, future remote access, future credential loading, and future runtime permission enforcement. Those paths must be designed and tested before they are enabled.
Compatibility Review
The local mock runtime supports a minimal OpenAI-compatible subset. Generic OpenAI-compatible and custom Node clients are validated against the local mock runtime only. Named third-party coding agents remain example-only, adapter-ready, or manual-review unless explicitly validated.
Privacy Review
Prompt content, completion content, authorization headers, bearer tokens, cookies, environment values, local absolute paths, and machine usernames are excluded or redacted from observability records by default.
Package Review
The package retains zero runtime dependencies and package version 4.2.0. npm publication remains a manual maintainer action, and v4.2.0 is the npm latest.
Test and Verification Status
Sprint H adds release-readiness verification on top of the existing gateway contract, registry, router, resilience, runtime, client, and observability checks. Full validation must include build, check:build, tests twice, verify, docs build, package dry-run, npm audit for production dependencies, and dependency listing.
Documentation Status
The public docs now include compatibility, API reference, known limitations, security model, and release-readiness pages. They intentionally avoid claiming production readiness, full OpenAI compatibility, external provider execution, or live failover.
Known Limitations
Remaining Blockers
No release blocker remains for v4.2.0. Future releases should preserve the documented mock-only and metadata-only boundaries until external provider execution is explicitly implemented and validated.
Release Recommendation
READY WITH DOCUMENTED LIMITATIONS