Best Byte AI
Mac agent infrastructure
Native Swift control for Python agents on macOS.
SwiftPython Commercial packages a signed CPython worker sidecar, actor-isolated ProcessPool, typed remote handles, shared-memory streaming, reentrant callbacks, and VM-capable isolation into the runtime layer behind SiriusAgent and SiriusMsg.
Public runtime layer
Most Swift-to-Python bridges put CPython inside the app process and leave the product with one interpreter, one GIL, and one crash domain. SwiftPython keeps the fast in-process path, then adds a worker runtime for package-heavy agent work.
The public commercial package ships the runtime API, worker sidecar, VM worker scripts, entitlement templates, runnable examples, and integration docs that Best Byte AI products depend on.
Runtime fit
SwiftPython Commercial is for Mac apps where Swift owns the product, permissions, signing, updates, and policy while Python runs package-heavy agent work behind an explicit runtime boundary.
Simple embedded Python calls from Swift.
The app still shares the interpreter, GIL, thread behavior, and crash domain.
Keep the native Swift API, then move agent workloads into ProcessPool or VM workers.
Hand-built native bindings around Python or CPython-adjacent code.
They do not package a Swift-owned worker pool, Mac sidecar, callbacks, and product distribution surface.
Typed handles, callback channels, generated Swift-facing APIs, and signed Mac runtime artifacts.
Python-first parallelism, clusters, task graphs, and distributed compute.
Python owns orchestration; Mac apps still need lifecycle, policy, handles, and distribution discipline.
Actor-isolated ProcessPool control with warmup replay, bounded respawn, events, and Swift-side ownership.
Network services with well-defined request and streaming contracts.
RPC alone does not give Swift Python object handles, GIL-aware callbacks, or local shared-memory streaming.
Local IPC designed for Python objects, stream events, progress, keepalive, and reentrant callbacks.
Signed Mac products that need Swift UX with isolated Python agent execution.
Swift owns permissions, policy, app lifecycle, updates, and user trust.
XCFramework, signed worker sidecar, ProcessPool, VM scripts, examples, and integration docs.
ProcessPool substance
PyHandle and OwnedPyHandle let Swift hold references to Python objects that live in worker processes, with generation tracking and stale-handle safety instead of pretending remote objects are local values.
PythonProcessPool runs Python work in separate worker processes, so CPU-bound packages and native extensions do not inherit the host app's entire crash surface.
The pool moves beyond request-response calls with binary-framed IPC, side-channel setup, stream events, progress, out-of-band buffers, and callback paths that Python can use to call back into Swift.
evalEvents streamsThe runtime is packaged for applications: binary framework, sidecar worker, VM worker scripts, entitlement templates, examples, app-bundle guidance, and the preflight docs needed to ship it.
SwiftPythonWorkerSandboxPoolRuntime boundary
SwiftUI and AppKit product surfaces, local sockets, permissions, signing, notarization, login items, and user-facing controls.
Actor-isolated pool management, handles, streams, callbacks, events, and generated Swift wrappers over Python packages.
Sidecar processes or VM tenants that run package-heavy code away from the host app's permission and crash boundary.
Shipping proof
SiriusAgent and SiriusMsg use the same product rule: keep privileged Mac behavior native, and run agent logic through explicit SwiftPython boundaries.
The binary package for app builders: runtime XCFramework, worker sidecar, VM scripts, entitlement templates, examples, and API guide.
Use the runtime package
Native agent host
A Mac agent host built on SwiftPython for providers, tools, browser work, memory, sandboxing, and local execution.
Read the runtime boundary
Public release
A signed local Apple Messages bridge for AI agents with explicit allowlists, a background agent, local service boundary, and signed update feed.
View SiriusMsg