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contracts: A25 — sync callbacks are handed to host modules by the application #258

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Aug 31, 2026
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contracts: A25 — sync callbacks are handed to host modules by the application #258

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8 changes: 7 additions & 1 deletion contracts/embedder-api.md
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Expand Up @@ -500,7 +500,13 @@ class PeerTrappedError extends Error { // A7: a stream/future op whose peer ins
exported from `@polyengine/runtime/embedder` — application machinery in
A22's sense, like `createStream`: only an instantiating application
holds export functions, so this is deliberately NOT host-module
vocabulary and does not touch `@polyengine/protocol`. Recognition is by
vocabulary and does not touch `@polyengine/protocol`. A host module
MUST NOT import the runtime to get it (A22's rule is unchanged): a host
module whose shape wants a synchronous guest callback is **handed one
by the application** — `sync(exports.f)` produces a plain function —
exactly as a host module wanting writer-driven push is handed a
`StreamWriter` (A22); placement stays with the deploying application.
Recognition is by
brand (`polyengine.syncCallable/1`, a registry symbol per A9) so views
work across mixed runtime copies. Dispatch by target shape:

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