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sdk/README.md

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 # External Worker SDKs
 
-Compiler authors: the private [native release workflow](native-release.md) builds and signs Dever runtime packs. It is separate from these external-language Worker SDKs and from application configuration.
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 These are stdio Worker libraries for Python, JavaScript (Node), and Go. The compiler remains the sole owner of Port schemas. Each checked external Adapter exposes `ExternalWorkerContract::sdk_manifest()`, including the exact identity and recursive setting, input, output and declared-error types. The managed Python and JavaScript runners package this manifest and bind each Port operation to a same-named function exported by the Adapter entry; JavaScript accepts ESM named exports or CommonJS `module.exports` properties. Application code does not maintain a second registration table. Python uses `Worker.from_manifest(manifest, handlers)`, JavaScript uses `Worker.fromManifest(manifest, handlers)`, and Go uses `NewFromManifest(manifest)` followed by `RegisterHandlers(handlers)`. These paths decode inputs and validate results and declared business-error payloads from the same compiler-generated contract. The SDK checks the identity during `hello` and never adopts a schema supplied by the supervisor.
 
 The lower-level `Contract`/`Worker` registration API remains available for protocol fixtures. The setting decoder runs before `ready`; it receives only the `hello.setting` value. Handlers return JSON-compatible values or a declared `BusinessError`. Python handlers are async; JavaScript handlers receive an `AbortSignal`; Go handlers receive a `context.Context`. A cooperative cancellation receives one `dever.cancelled` protocol error and discards its handler result. If a handler ignores cancellation for one second, the Worker fails and admits no further calls. The supervisor owns the Worker process and its stdin lifetime; an in-process Go `Serve` caller must close or unblock its own `io.Reader` when returning.