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Kumwe extension SDK

kumwe/extension-sdk is the canonical author-facing contract for Kumwe extensions. It provides:

• strict, versioned manifest parsing and a canonical contribution graph;
• host-neutral SPI types for executable extension bindings;
• independently reusable scaffold, build, inspection, signing and conformance components; and
• SDK-owned public API, generation and resource records verified on every build.

The namespace is Kumwe\Extension. A host consumes these types directly. The SDK ships no aliases, namespace translation, compatibility bridge, host-domain implementation, admission decision or runtime storage.

Authority boundary

The signed manifest is the sole declarative authority. An extension binding provider binds executable implementations to identifiers that already exist in the validated manifest graph. Code cannot add a route, event, job, projection, policy or composition declaration.

The SDK reports bounded structural, archive, signature and conformance facts. A consuming host owns admission policy, trust state, authorization, activation and persistence. The host must pass the same SDK inspection report into its policy layer instead of implementing a parallel scanner.

Installation

Requires PHP 8.5 with JSON, mbstring, Sodium and ZIP. Composer installs the exact canonical library contracts declared in composer.json. Studio document-schema authority belongs to kumwe/producer. Core and other consumers qualify and pin an exact SDK release.

The author toolchain is a PHP API. Start with Kumwe\Extension\Toolchain\ComponentScaffolder, DeterministicPackageBuilder, PackageSigner, PackageInspector or ExtensionPackageConformance. The installed vendor/bin/kumwe-extension command exposes the same fact-reporting build, inspect, evidence and conformance lanes. Host integration is described in docs/host-integration.md.

Quality gate

composer check validates Composer metadata and strict autoloading, lints every PHP file, checks the canonical contract records, runs the test suite, performs max-level PHPStan analysis and audits installed dependencies. CI and release automation run the same gate, then prove a production-only install.

See docs/engineering-standard.md and CHANGELOG.md.

License

Apache License 2.0. See LICENSE.

Public API and construction

The canonical Version 2 manifests are public API, service map. The complete API reference is generated from every declared public type, member signature and source PHPDoc. Existing SDK classification, generation fixtures and resource digest inventories remain authoritative SDK compatibility records and keep their existing paths.

The SDK uses explicit construction and has no ConfigProvider. An authoring operation receives its canonical encoder, inspectors and signing collaborators from its caller; the library cannot select host trust, signing authority or a compatible native tuple. See architecture for lifetimes and I/O, and direct construction for composition. The CLI verifies an explicitly supplied native tuple per invocation. The runtime PHP API and generated production extensions depend on the portable encoder contract; native Computation is required only by the optional CLI and development/generated test toolchain.

Compatibility, releases and support

The App agreement define Core responsibilities, exact version pins, generation compatibility and shared inspection. The release contract record binds exported APIs, manifest digests and consumer verification obligations. Published versions, source CI and Core integration are distinct states; passing CI alone does not establish independent release qualification.

See releases, release policy, test ownership. Report defects or missing contract capabilities in GitHub issues.