diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 96d5cd5393d..f43b54676ce 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,9 +19,9 @@ name: CI
 
 on:
   pull_request:
-    branches: [main]
+    branches: [main, rust-preview]
   push:
-    branches: [main]
+    branches: [main, rust-preview]
   workflow_dispatch:
 
 permissions:
@@ -38,10 +38,11 @@ jobs:
     timeout-minutes: 180
     env:
       MBX_CACHE_EXPORT_GROUP: ci-${{ github.run_id }}-${{ github.run_attempt }}-test
-      MBX_GC_AUTO: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' && '0' || '1' }}
+      MBX_GC_AUTO: ${{ github.event_name == 'push' && (github.ref == 'refs/heads/main' || github.ref == 'refs/heads/rust-preview') && '0' || '1' }}
       MBX_TARGET_VIEWS: "0"
       # Linked outputs already live in target; retain cache copies only for export.
-      MBX_CACHE_LINKS: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' && '1' || '0' }}
+      # Pushes to either long-lived branch save the cache their pull requests restore.
+      MBX_CACHE_LINKS: ${{ github.event_name == 'push' && (github.ref == 'refs/heads/main' || github.ref == 'refs/heads/rust-preview') && '1' || '0' }}
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
@@ -170,10 +171,10 @@ jobs:
           target/debug/maka desktop --version
           target/debug/maka-desktop-shell --version
       - name: Export compiled Rust cache
-        if: github.event_name == 'push' && github.ref == 'refs/heads/main' && steps.mbx-cache.outputs.cache-hit != 'true'
+        if: github.event_name == 'push' && (github.ref == 'refs/heads/main' || github.ref == 'refs/heads/rust-preview') && steps.mbx-cache.outputs.cache-hit != 'true'
         run: mbx cache export --group "$MBX_CACHE_EXPORT_GROUP" --format directory "$RUNNER_TEMP/mbx-cache"
       - name: Save compiled Rust cache
-        if: github.event_name == 'push' && github.ref == 'refs/heads/main' && steps.mbx-cache.outputs.cache-hit != 'true'
+        if: github.event_name == 'push' && (github.ref == 'refs/heads/main' || github.ref == 'refs/heads/rust-preview') && steps.mbx-cache.outputs.cache-hit != 'true'
         uses: actions/cache/save@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
         with:
           path: ${{ runner.temp }}/mbx-cache
diff --git a/.github/workflows/computer-use.yml b/.github/workflows/computer-use.yml
index 2bd5902028b..7b3781f7a0f 100644
--- a/.github/workflows/computer-use.yml
+++ b/.github/workflows/computer-use.yml
@@ -19,7 +19,7 @@ name: Computer Use
 
 on:
   pull_request:
-    branches: [main]
+    branches: [main, rust-preview]
     paths:
       - .github/workflows/computer-use.yml
       - Cargo.toml
diff --git a/justfile b/justfile
index 58a9fa3e988..0f072527241 100644
--- a/justfile
+++ b/justfile
@@ -63,12 +63,13 @@ lint: setup
     cargo clippy --config 'build.warnings="deny"' --locked --workspace --all-targets
     node node_modules/@biomejs/biome/bin/biome lint .
 
-# Verify generated contracts and TypeScript consumers.
+# Verify generated contracts, TypeScript consumers and the workbench UI sources.
 [group('Checks')]
 typecheck: setup
     npm --workspace @maka-agent/plugin-sdk run schema:check
     npm --workspace @maka-agent/plugin-sdk run typecheck
     npm --workspace @maka-agent/product run typecheck
+    dir="$(mktemp -d)/ui-types" && cargo run --locked -q -p maka-workbench --example ui_types -- "$dir" && node node_modules/typescript/bin/tsc -p "$dir/tsconfig.json"
 
 # Run Rust behavior tests; pass nextest filters after the recipe name.
 [group('Checks')]
diff --git a/products/maka/cli/notices.json b/products/maka/cli/notices.json
index 2c8b134e85d..b021e57572a 100644
--- a/products/maka/cli/notices.json
+++ b/products/maka/cli/notices.json
@@ -4,11 +4,11 @@
     "Cargo.toml": "9c58d4f2ef93b548e6c02de8950270a9da42bcfea000ab262a78985e75e672e7",
     "package-lock.json": "863e20d94f46507befd14d7abe94982bb110dff3efaa13b9d1c3b60333f8d64a",
     "package.json": "a513ba49c73a1cd6d8060d9a4f2edb47f5286469553cf3b3f4959b9ceb64fa58",
-    "packages/plugin-sdk/src/composer-view.ts": "9359badca97b4db33ffb906a3633f9ab0bf542d07c9c5f7ffc505e76bd217a0c",
-    "packages/plugin-sdk/src/configurations.ts": "6c1693e470e93a688890f2354b630758f9eb5c782399278b8d94d12d446c7f83",
-    "packages/plugin-sdk/src/contracts.ts": "875706c09941abbe93e88bdc0688dcdc2093aea00da2413d711378a2548090f6",
-    "packages/plugin-sdk/src/generated/methods.ts": "07f192144c727eb132a0c5bf0a6506fe435ab45bf7cb5fdb4f578ae5a5c44b0d",
-    "packages/plugin-sdk/src/generated/runtime.ts": "8b1189af19e7f04c03723f261b81eaccfb213be9b00940a31aba3507012b95b0",
+    "packages/plugin-sdk/src/composer-view.ts": "b0cf8a640d6b06dc30b071a477069a4860d7e12643024932d3d606f047815469",
+    "packages/plugin-sdk/src/configurations.ts": "5cd4b679d786a4766f97460c8fbe070a92415b5210561344c71de4f61c471f5e",
+    "packages/plugin-sdk/src/contracts.ts": "0c3bd884ff765f50b7e5c4efa1268e2c1907dc3c44ee3693ff8c9771cedcd133",
+    "packages/plugin-sdk/src/generated/methods.ts": "bfd8a5620e074c04271cdbe3e0d8f2b729c0435be48dbf1451d717756ba4201b",
+    "packages/plugin-sdk/src/generated/runtime.ts": "9508dc5cda141731e27eacaeaec3a268e3dd0617b6804b33ce5c3142678b1f0c",
     "packages/plugin-sdk/src/index.ts": "813f3f63b2bc47a4ce3fc9e1deb9fcad2f51dd13a26b37eb1341202e0804dc81",
     "packages/plugin-sdk/src/native.ts": "6a354ce1068d3eb288ebaf4e3f0e4a2ef00479690e895e53fa4be3f1789fb620",
     "packages/plugin-sdk/src/workbench-views.ts": "946644214bd2853f7a820c647953660a19dc4c1e7e63596ac68a8483f1ce642f",
@@ -18,7 +18,7 @@
     "platform/background-health/Cargo.toml": "41e89dc7e43adf066306b03b3083cbd4163a5550f39d5be6669463d3c16c53a5",
     "platform/capabilities/Cargo.toml": "9b5407113c0595744e1da903e41171f6311be1a543309fe35cd977c3c62041d7",
     "platform/code-runtime/Cargo.toml": "30a8e555effeaa063b11d255d60d6f858d53e3bd950e2f162382324ef0a7cc20",
-    "platform/computer-use/Cargo.toml": "a98ddcf5a438f3a5b9489be024351d47426676fdafb544f9f067ffc7c211dc4d",
+    "platform/computer-use/Cargo.toml": "425a86d8101224fe98f21a93e6607fea5c8a876ea7bfa7f00c45be85e922b527",
     "platform/computer-use/THIRD_PARTY_NOTICES": "8b25853c9fe8f668531e01e69c6c803e511b7beac5b642f52b4fdf545bfa5dea",
     "platform/event-log/Cargo.toml": "e8d149e2fee903a4fd155931cd3191f986416797c4e6ddf60be4e556583e2e14",
     "platform/host-js/Cargo.toml": "881688e22e1325226dc54c1d94ad370fef2b4ce68fbc0c61b3574fbbae29541f",
@@ -45,7 +45,7 @@
     "plugins/agent/composer/package.ts": "4ac0929d7ea8fbcdff27bf13c59ffb2d9373f1bb066fe7cdb09fcc1504df1c21",
     "plugins/agent/composer/ui/composerCompletionSyntax.ts": "0a9252770f4ff5dcf5ee1823ddf86a1a93a462591d42b1c60b7f43b2546bebdc",
     "plugins/agent/composer/ui/composerPaste.ts": "1de35e799c82659a2da5278300c359bf1dd28458dcbb7450d2b87439f2b3fba6",
-    "plugins/agent/conversations/package.ts": "b82d1d0221d0202f71e3a154032f583fdfe63ef56c31a7226c5aca4edcd7d798",
+    "plugins/agent/conversations/package.ts": "5dfd4581b71d9e8b60a79ee3405f7cbb986428b4d5cfdb46612104617b242431",
     "plugins/agent/engine/Cargo.toml": "e396e52630904fe4351d43efb97637afc36d490b7778524bbbff1d1b502fd858",
     "plugins/agent/facts/Cargo.toml": "a74555b8eae72829b0692c7bca74c7085a9e6bcd128ade513d8a4a4409aef247",
     "plugins/agent/goal/Cargo.toml": "0e7b81aaa8b60b884a0f64fb586c03f7ecbdf1dc426d2d731ce8f80ba61cf9eb",
@@ -115,7 +115,7 @@
     "products/maka/bundle/package.json": "97af69b3a330f8ad0ab9959cbb9bc0663002c490ff6ba2cf35c52121585cb37a",
     "products/maka/bundle/scripts/build.mjs": "15476546ccd427c4419c968ec371f27b7c7f358814bb9e6aba06c093df1b4d4c",
     "products/maka/bundle/src/composition.ts": "785c717bec821127bc0c23da9c3b7d9da2fa722e9a665ce841511d17fe6671f5",
-    "products/maka/bundle/src/installation.ts": "b0e05169edba8d736fe822b6cc0910ecbb7d55d4cc1a5f4ac22297a94aa4ac2d",
+    "products/maka/bundle/src/installation.ts": "6bec18c13c51aa3ad9a2107297aa7e87ecc4f1e80dded8474c938608535a4832",
     "products/maka/cli/Cargo.toml": "772526a5e914212c2dfd03edfd30f3c04f2a60d2a76d168863dea33300232fd4",
     "products/maka/cli/build/main.rs": "446a3f9fb976bdf8ee1f0f21f2a5dfce0c0854b32f1a1c0294143cb654171e7f",
     "products/maka/cli/build/product.rs": "0ff203a6c9b04f97ee75a3ac55af384865fe3e74d5c169d5a022a9de8527584d",