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Changelog

All notable changes to @actcore/web-runtime are documented here. The format follows Keep a Changelog, and this project adheres to Semantic Versioning.

[0.1.1] — 2026-07-09

Changed

  • Releases now publish from CI on a version tag via npm Trusted Publishing (OIDC) with provenance attestation, scoped to a protected npm GitHub environment (.github/workflows/release.yml). Adds git-cliff changelog generation (cliff.toml).

[0.1.0] — 2026-07-09

Initial public release — a browser runtime for ACT (Agent Component Tools) components.

Added

  • Load, transpile in-browser (via jco), and run signed ACT wasm components in a browser tab using the WebAssembly Component Model with JSPI — no server, no Node.
  • act:tools/tool-provider@0.2.0: list and call tools, with both immediate and streaming (ReadableStream) tool results.
  • act:sessions/session-provider@0.2.0: open and close stateful sessions.
  • WebMCP (exposeToWebmcp / isWebmcpAvailable): register a loaded component's tools on the browser's native document.modelContext so a WebMCP-capable agent can discover and call them — opt-in, feature-gated, teardown via AbortSignal.
  • Off-main-thread transpilation (Web Worker) with a persistent IndexedDB cache keyed by runtime version + component hash; repeat loads skip transpilation.
  • wasi:http (wasip3) and wasi:sockets browser shims, so components that make network requests (e.g. http-client) run in the browser.
  • BCP-47-aware localized string resolution (resolveLocalizedString).
  • Built on jco 1.25 / jco-transpile 0.4 / WASI 0.3.0. Requires JSPI (Chrome 137+, Firefox Nightly 152+, Safari TP 243+).