feat(moss-vscode): isolate Moss in a worker and persist indexes

Run the native Moss runtime in a forked Node worker so crashes cannot
take down VS Code, save/load indexes from disk across sessions, and
refresh sidebar branding with Moss wordmarks and avatar.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: samanyugoyal2010

apps/moss-vscode/README.md

@@ -1,13 +1,18 @@
+<p align="center">
+  <img src="media/moss_avatar_core.png" alt="Moss" width="96" />
+</p>
+
 # Moss Code Search (VS Code)
 
 Semantic search over your open workspace, powered by [Moss](https://moss.dev) — local-first, sub-10ms retrieval via `SessionIndex`.
 
 ## Features
 
-- **Manual indexing** — click **Create Index** in the sidebar (no auto-index on open)
+- **Manual indexing** — click **Create Index** in the sidebar the first time
+- **Persisted indexes** — reopening the same folder restores the saved index (no full rebuild)
 - Sidebar with live (debounced) semantic search after indexing
 - Click a result to jump to file + line
-- Incremental re-index on save / create / delete / rename
+- Incremental re-index on save / create / delete / rename (also saved to disk)
 - Credentials via `.env`, VS Code settings, or Secret Storage
 
 ## Setup
@@ -35,6 +40,7 @@ Or from the Command Palette after installing a `.vsix`:
 | `Moss: Create Index` | Index the open workspace (required before search) |
 | `Moss: Rebuild Index` | Re-scan and re-index the workspace |
 | `Moss: Configure Credentials` | Store project ID / key in Secret Storage |
+| `Moss: Show Logs` | Open the Moss Code Search output channel |
 
 ## Settings
 
@@ -45,6 +51,8 @@ Or from the Command Palette after installing a `.vsix`:
 
 ## Architecture
 
-Extension host owns a Moss `SessionIndex` named `vscode-{workspaceHash}`. Files are chunked into `DocumentInfo` records (`{path}#chunk-{n}`) with metadata for navigation. Queries run in-process against the local session.
+Extension host owns UI and file scanning. Moss native runtime runs in a separate Node worker (`dist/mossWorker.js`) so a native crash cannot take down VS Code. Sessions are named `vscode-{workspaceHash}`. Files are chunked into `DocumentInfo` records (`{path}#chunk-{n}`) with metadata for navigation.
+
+After **Create Index**, the session is written with Moss `saveToDisk` under the extension global storage (`indexes/{workspaceHash}/`), plus a `meta.json` map of file → chunk counts. Reopening that folder loads the cache with `loadFromDisk` so search works immediately. Use **Moss: Rebuild Index** to force a full reindex.
 
-Native modules (`@moss-dev/moss`, `@moss-dev/moss-core`) are left external by esbuild and loaded from `node_modules` at runtime.
+Native modules (`@moss-dev/moss`, `@moss-dev/moss-core`) are left external by esbuild and loaded from `node_modules` at runtime in the worker.

apps/moss-vscode/esbuild.mjs

@@ -4,9 +4,12 @@ const watch = process.argv.includes("--watch");
 
 /** @type {import('esbuild').BuildOptions} */
 const options = {
-  entryPoints: ["src/extension.ts"],
+  entryPoints: {
+    extension: "src/extension.ts",
+    mossWorker: "src/worker/mossWorker.ts",
+  },
   bundle: true,
-  outfile: "dist/extension.js",
+  outdir: "dist",
   external: [
     "vscode",
     "@moss-dev/moss",

apps/moss-vscode/media/icon.svg

@@ -1,7 +1,12 @@
 :root {
   color-scheme: light dark;
-  --moss-gap: 8px;
-  --moss-radius: 4px;
+  --moss-gap: 10px;
+  --moss-radius: 6px;
+  --moss-ink: #141915;
+  --moss-paper: #f2f2f2;
+  --moss-accent: var(--vscode-button-background, #141915);
+  --moss-accent-fg: var(--vscode-button-foreground, #f2f2f2);
+  --moss-border: var(--vscode-panel-border, rgba(128, 128, 128, 0.35));
 }
 
 * {
@@ -26,9 +31,49 @@ body {
   height: 100vh;
 }
 
+.brand-header {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  padding-bottom: 4px;
+}
+
+.brand-wordmark {
+  display: block;
+  height: 28px;
+  width: auto;
+  max-width: 140px;
+  object-fit: contain;
+}
+
+.brand-wordmark-light {
+  display: none;
+}
+
+.brand-wordmark-dark {
+  display: block;
+}
+
+body.vscode-dark .brand-wordmark-light,
+body.vscode-high-contrast .brand-wordmark-light {
+  display: block;
+}
+
+body.vscode-dark .brand-wordmark-dark,
+body.vscode-high-contrast .brand-wordmark-dark {
+  display: none;
+}
+
+.brand-tagline {
+  margin: 0;
+  font-size: 11px;
+  opacity: 0.72;
+  letter-spacing: 0.01em;
+}
+
 .index-panel {
-  padding: 10px;
-  border: 1px solid var(--vscode-panel-border, rgba(128, 128, 128, 0.35));
+  padding: 12px;
+  border: 1px solid var(--moss-border);
   border-radius: var(--moss-radius);
   background: var(--vscode-editor-background);
 }
@@ -42,17 +87,24 @@ body {
 
 .primary-btn {
   width: 100%;
-  padding: 8px 12px;
-  border: none;
+  padding: 9px 12px;
+  border: 1px solid transparent;
   border-radius: var(--moss-radius);
-  background: var(--vscode-button-background);
-  color: var(--vscode-button-foreground);
+  background: var(--moss-accent);
+  color: var(--moss-accent-fg);
   cursor: pointer;
   font: inherit;
+  font-weight: 600;
+  letter-spacing: 0.01em;
 }
 
 .primary-btn:hover:not(:disabled) {
-  background: var(--vscode-button-hoverBackground);
+  background: var(--vscode-button-hoverBackground, #2a2f2b);
+}
+
+.primary-btn:focus-visible {
+  outline: 2px solid var(--vscode-focusBorder, #141915);
+  outline-offset: 2px;
 }
 
 .primary-btn:disabled {
@@ -72,7 +124,7 @@ body {
 
 #query {
   flex: 1;
-  padding: 6px 8px;
+  padding: 8px 10px;
   border: 1px solid var(--vscode-input-border, transparent);
   border-radius: var(--moss-radius);
   background: var(--vscode-input-background);
@@ -82,12 +134,33 @@ body {
 
 #query:focus {
   border-color: var(--vscode-focusBorder);
+  box-shadow: 0 0 0 1px var(--vscode-focusBorder);
+}
+
+.status-row {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  min-height: 1.2em;
+}
+
+.status-avatar {
+  width: 14px;
+  height: 14px;
+  border-radius: 3px;
+  object-fit: cover;
+  flex-shrink: 0;
+  opacity: 0;
+  transition: opacity 0.15s ease;
+}
+
+.status-avatar.visible {
+  opacity: 1;
 }
 
 #status {
   font-size: 11px;
   opacity: 0.8;
-  min-height: 1.2em;
 }
 
 #results {
@@ -102,9 +175,9 @@ body {
   display: block;
   width: 100%;
   text-align: left;
-  padding: 8px;
+  padding: 8px 10px;
   margin-bottom: 6px;
-  border: none;
+  border: 1px solid transparent;
   border-radius: var(--moss-radius);
   background: var(--vscode-list-inactiveSelectionBackground, transparent);
   color: inherit;
@@ -113,6 +186,7 @@ body {
 
 .result:hover {
   background: var(--vscode-list-hoverBackground);
+  border-color: var(--moss-border);
 }
 
 .result-header {
@@ -131,6 +205,7 @@ body {
   flex-shrink: 0;
   font-size: 11px;
   opacity: 0.75;
+  font-variant-numeric: tabular-nums;
 }
 
 .preview {

apps/moss-vscode/media/moss_avatar_core.png

@@ -5,6 +5,7 @@
   "version": "0.1.0",
   "publisher": "moss-dev",
   "license": "BSD-2-Clause",
+  "icon": "media/moss_avatar_core.png",
   "engines": {
     "vscode": "^1.85.0",
     "node": ">=20"
@@ -13,9 +14,6 @@
     "Other",
     "Machine Learning"
   ],
-  "activationEvents": [
-    "onStartupFinished"
-  ],
   "main": "./dist/extension.js",
   "contributes": {
     "viewsContainers": {
@@ -52,6 +50,10 @@
       {
         "command": "moss.credentials.configure",
         "title": "Moss: Configure Credentials"
+      },
+      {
+        "command": "moss.logs.show",
+        "title": "Moss: Show Logs"
       }
     ],
     "configuration": {