Synth Workshop · Stable 0.4.0

Make, inspect, and refine with AI on your Mac.

Workshop is Synth Desktop: a local-first workbench for conversations, tools, traces, and durable visual work. Start with Laguna XS on-device, then sign in only when you want Synth Cloud models and account-backed usage.

Download v0.4 for Apple silicon Checksum and provenance

Release

v0.4 friends release

Runs locally

Laguna XS on your Mac

Platform

macOS 14+ · Apple silicon

Install in three steps

From ZIP to first launch.

1 · Verify
Download the versioned ZIP. Compare its SHA-256 with the value on the download page before opening it.
2 · Extract
Unzip Synth Desktop. You can move the app to Applications or run it from the extracted folder.
3 · Open
This friends build is ad-hoc signed and temporarily unnotarized. Control-click Synth Desktop.app, choose Open, then confirm Open.

Your first session

Local first. Cloud when you choose.

Try Laguna XS locally

Open the model picker, choose Local Laguna, and let Workshop guide the managed model download. Local prompts run on your Mac; 32 GB unified memory is recommended.

Pair for Synth Cloud

Account pairing is optional for local use. Sign in when you want Laguna S and account-backed cloud allowance. Workshop shows the authoritative balance—or UNKNOWN if it cannot verify it.

Version 0.4.0

Release notes

New

Product-owned GEPA workflows cover bounded Banking77 and Craftax optimization with prepare, digest-bound start, live watch, candidate lineage, frontier, and materialized-result views.
Transcript-first Craftax trace inspection shows model-call input, reasoning, output, tool evidence, raw envelopes, and honest missing-evidence states.
Programmatic eval lanes and container capability checks fail closed when the selected producer or sidecar cannot satisfy the recipe.
Local VictoriaLogs-backed diagnostics correlate optimizer runs, containers, streams, visuals, and terminal outcomes.

Improved

Live visuals replay through declared poll transports with durable, lane-local cursors and one canonical binding envelope.
Generation-speed labels are immutable historical snapshots instead of periodically recomputed aggregates.
Completed turns measure elapsed work from the latest accepted turn boundary to the durable terminal event.
Review captures use a dedicated window identity, separate from the product-window sizing policy.

Fixed

Reopening or reconnecting a live visual no longer invents stream URLs, collapses multiplexed rollout identities, or rewrites earlier evidence.
Open visual panes reconcile committed revisions without a close-and-reopen cycle.
Missing token usage and timing remain unavailable instead of being presented as zero.

Requirements

macOS 14 or later on Apple silicon (M-series)
16 GB unified memory minimum; 32 GB recommended for Laguna XS
An internet connection for sign-in, cloud models, billing, and update checks
Enough local storage for any on-device model you choose to download

Known limits

This temporary v0.4.0 package is ad-hoc signed and not Apple-notarized. macOS may require Control-click → Open or System Settings → Privacy & Security → Open Anyway on first launch.
Updates are manual in v0.4. About can announce a newer version, but it will always send you back to this official download page.
The bounded Banking77 GEPA smoke is an acceptance workflow, not a promise that every run will improve the seed prompt.
This friends release requires macOS 14 or later on Apple silicon; Intel Macs, Windows, and Linux are not supported.

Privacy and support

Local model use runs on your Mac. When you choose a cloud model or hosted account feature, the necessary request is sent to that selected service.
Provider credentials remain in the native app's custody rather than being handled by this download page.

If something goes wrong, send your release contact version 0.4.0, your macOS version, and what happened. Keep the app data directory intact for diagnosis.

From ZIP to first launch.

1 · Verify

Download the versioned ZIP. Compare its SHA-256 with the value on the download page before opening it.

2 · Extract

Unzip Synth Desktop. You can move the app to Applications or run it from the extracted folder.

3 · Open

This friends build is ad-hoc signed and temporarily unnotarized. Control-click Synth Desktop.app, choose Open, then confirm Open.

Local first. Cloud when you choose.

Try Laguna XS locally

Open the model picker, choose Local Laguna, and let Workshop guide the managed model download. Local prompts run on your Mac; 32 GB unified memory is recommended.

Pair for Synth Cloud

Account pairing is optional for local use. Sign in when you want Laguna S and account-backed cloud allowance. Workshop shows the authoritative balance—or UNKNOWN if it cannot verify it.

Release notes

New

Product-owned GEPA workflows cover bounded Banking77 and Craftax optimization with prepare, digest-bound start, live watch, candidate lineage, frontier, and materialized-result views.
Transcript-first Craftax trace inspection shows model-call input, reasoning, output, tool evidence, raw envelopes, and honest missing-evidence states.
Programmatic eval lanes and container capability checks fail closed when the selected producer or sidecar cannot satisfy the recipe.
Local VictoriaLogs-backed diagnostics correlate optimizer runs, containers, streams, visuals, and terminal outcomes.

Improved

Live visuals replay through declared poll transports with durable, lane-local cursors and one canonical binding envelope.
Generation-speed labels are immutable historical snapshots instead of periodically recomputed aggregates.
Completed turns measure elapsed work from the latest accepted turn boundary to the durable terminal event.
Review captures use a dedicated window identity, separate from the product-window sizing policy.

Fixed

Reopening or reconnecting a live visual no longer invents stream URLs, collapses multiplexed rollout identities, or rewrites earlier evidence.
Open visual panes reconcile committed revisions without a close-and-reopen cycle.
Missing token usage and timing remain unavailable instead of being presented as zero.

Known limits

This temporary v0.4.0 package is ad-hoc signed and not Apple-notarized. macOS may require Control-click → Open or System Settings → Privacy & Security → Open Anyway on first launch.

Updates are manual in v0.4. About can announce a newer version, but it will always send you back to this official download page.

The bounded Banking77 GEPA smoke is an acceptance workflow, not a promise that every run will improve the seed prompt.

This friends release requires macOS 14 or later on Apple silicon; Intel Macs, Windows, and Linux are not supported.

Privacy and support

Local model use runs on your Mac. When you choose a cloud model or hosted account feature, the necessary request is sent to that selected service.

Provider credentials remain in the native app's custody rather than being handled by this download page.

If something goes wrong, send your release contact version 0.4.0, your macOS version, and what happened. Keep the app data directory intact for diagnosis.