diff --git a/apps/ui/package.json b/apps/ui/package.json
index 72755463..f0053d53 100644
--- a/apps/ui/package.json
+++ b/apps/ui/package.json
@@ -40,6 +40,7 @@
   },
   "dependencies": {
     "@automaker/dependency-resolver": "1.0.0",
+    "@automaker/spec-parser": "1.0.0",
     "@automaker/types": "1.0.0",
     "@codemirror/lang-xml": "6.1.0",
     "@codemirror/language": "^6.12.1",
diff --git a/apps/ui/src/components/ui/xml-syntax-editor.tsx b/apps/ui/src/components/ui/xml-syntax-editor.tsx
index 8929d4a8..6f9aac33 100644
--- a/apps/ui/src/components/ui/xml-syntax-editor.tsx
+++ b/apps/ui/src/components/ui/xml-syntax-editor.tsx
@@ -1,9 +1,6 @@
 import CodeMirror from '@uiw/react-codemirror';
 import { xml } from '@codemirror/lang-xml';
 import { EditorView } from '@codemirror/view';
-import { Extension } from '@codemirror/state';
-import { HighlightStyle, syntaxHighlighting } from '@codemirror/language';
-import { tags as t } from '@lezer/highlight';
 import { cn } from '@/lib/utils';
 
 interface XmlSyntaxEditorProps {
@@ -14,52 +11,19 @@ interface XmlSyntaxEditorProps {
   'data-testid'?: string;
 }
 
-// Syntax highlighting that uses CSS variables from the app's theme system
-// This automatically adapts to any theme (dark, light, dracula, nord, etc.)
-const syntaxColors = HighlightStyle.define([
-  // XML tags - use primary color
-  { tag: t.tagName, color: 'var(--primary)' },
-  { tag: t.angleBracket, color: 'var(--muted-foreground)' },
-
-  // Attributes
-  { tag: t.attributeName, color: 'var(--chart-2, oklch(0.6 0.118 184.704))' },
-  { tag: t.attributeValue, color: 'var(--chart-1, oklch(0.646 0.222 41.116))' },
-
-  // Strings and content
-  { tag: t.string, color: 'var(--chart-1, oklch(0.646 0.222 41.116))' },
-  { tag: t.content, color: 'var(--foreground)' },
-
-  // Comments
-  { tag: t.comment, color: 'var(--muted-foreground)', fontStyle: 'italic' },
-
-  // Special
-  { tag: t.processingInstruction, color: 'var(--muted-foreground)' },
-  { tag: t.documentMeta, color: 'var(--muted-foreground)' },
-]);
-
-// Editor theme using CSS variables
+// Simple editor theme - inherits text color from parent
 const editorTheme = EditorView.theme({
   '&': {
     height: '100%',
     fontSize: '0.875rem',
-    fontFamily: 'ui-monospace, monospace',
     backgroundColor: 'transparent',
-    color: 'var(--foreground)',
   },
   '.cm-scroller': {
     overflow: 'auto',
-    fontFamily: 'ui-monospace, monospace',
   },
   '.cm-content': {
     padding: '1rem',
     minHeight: '100%',
-    caretColor: 'var(--primary)',
-  },
-  '.cm-cursor, .cm-dropCursor': {
-    borderLeftColor: 'var(--primary)',
-  },
-  '&.cm-focused .cm-selectionBackground, .cm-selectionBackground, .cm-content ::selection': {
-    backgroundColor: 'oklch(0.55 0.25 265 / 0.3)',
   },
   '.cm-activeLine': {
     backgroundColor: 'transparent',
@@ -73,15 +37,8 @@ const editorTheme = EditorView.theme({
   '.cm-gutters': {
     display: 'none',
   },
-  '.cm-placeholder': {
-    color: 'var(--muted-foreground)',
-    fontStyle: 'italic',
-  },
 });
 
-// Combine all extensions
-const extensions: Extension[] = [xml(), syntaxHighlighting(syntaxColors), editorTheme];
-
 export function XmlSyntaxEditor({
   value,
   onChange,
@@ -94,16 +51,16 @@ export function XmlSyntaxEditor({
       <CodeMirror
         value={value}
         onChange={onChange}
-        extensions={extensions}
+        extensions={[xml(), editorTheme]}
         theme="none"
         placeholder={placeholder}
-        className="h-full [&_.cm-editor]:h-full"
+        className="h-full [&_.cm-editor]:h-full [&_.cm-content]:text-foreground"
         basicSetup={{
           lineNumbers: false,
           foldGutter: false,
           highlightActiveLine: false,
-          highlightSelectionMatches: true,
-          autocompletion: true,
+          highlightSelectionMatches: false,
+          autocompletion: false,
           bracketMatching: true,
           indentOnInput: true,
         }}
diff --git a/apps/ui/src/components/views/spec-view.tsx b/apps/ui/src/components/views/spec-view.tsx
index 88fec94b..29aeb7cd 100644
--- a/apps/ui/src/components/views/spec-view.tsx
+++ b/apps/ui/src/components/views/spec-view.tsx
@@ -1,19 +1,32 @@
-import { useState } from 'react';
+import { useState, useCallback } from 'react';
 import { useAppStore } from '@/store/app-store';
 import { Spinner } from '@/components/ui/spinner';
 
 // Extracted hooks
-import { useSpecLoading, useSpecSave, useSpecGeneration } from './spec-view/hooks';
+import { useSpecLoading, useSpecSave, useSpecGeneration, useSpecParser } from './spec-view/hooks';
 
 // Extracted components
-import { SpecHeader, SpecEditor, SpecEmptyState } from './spec-view/components';
+import {
+  SpecHeader,
+  SpecEditor,
+  SpecEmptyState,
+  SpecViewMode,
+  SpecEditMode,
+  SpecModeTabs,
+} from './spec-view/components';
 
 // Extracted dialogs
 import { CreateSpecDialog, RegenerateSpecDialog } from './spec-view/dialogs';
 
+// Types
+import type { SpecViewMode as SpecViewModeType } from './spec-view/types';
+
 export function SpecView() {
   const { currentProject, appSpec } = useAppStore();
 
+  // View mode state - default to 'view'
+  const [mode, setMode] = useState<SpecViewModeType>('view');
+
   // Actions panel state (for tablet/mobile)
   const [showActionsPanel, setShowActionsPanel] = useState(false);
 
@@ -21,7 +34,10 @@ export function SpecView() {
   const { isLoading, specExists, isGenerationRunning, loadSpec } = useSpecLoading();
 
   // Save state
-  const { isSaving, hasChanges, saveSpec, handleChange, setHasChanges } = useSpecSave();
+  const { isSaving, hasChanges, saveSpec, handleChange } = useSpecSave();
+
+  // Parse the spec XML
+  const { isValid: isParseValid, parsedSpec, errors: parseErrors } = useSpecParser(appSpec);
 
   // Generation state and handlers
   const {
@@ -70,8 +86,17 @@ export function SpecView() {
     handleSync,
   } = useSpecGeneration({ loadSpec });
 
-  // Reset hasChanges when spec is reloaded
-  // (This is needed because loadSpec updates appSpec in the store)
+  // Handle mode change - if parse is invalid, force source mode
+  const handleModeChange = useCallback(
+    (newMode: SpecViewModeType) => {
+      if ((newMode === 'view' || newMode === 'edit') && !isParseValid) {
+        // Can't switch to view/edit if parse is invalid
+        return;
+      }
+      setMode(newMode);
+    },
+    [isParseValid]
+  );
 
   // No project selected
   if (!currentProject) {
@@ -126,6 +151,28 @@ export function SpecView() {
     );
   }
 
+  // Render content based on mode
+  const renderContent = () => {
+    // If the XML is invalid or spec is not parsed, we can only show the source editor.
+    // The tabs for other modes are disabled, but this is an extra safeguard.
+    if (!isParseValid || !parsedSpec) {
+      return <SpecEditor value={appSpec} onChange={handleChange} />;
+    }
+
+    switch (mode) {
+      case 'view':
+        return <SpecViewMode spec={parsedSpec} />;
+      case 'edit':
+        return <SpecEditMode spec={parsedSpec} onChange={handleChange} />;
+      case 'source':
+      default:
+        return <SpecEditor value={appSpec} onChange={handleChange} />;
+    }
+  };
+
+  const isProcessing =
+    isRegenerating || isGenerationRunning || isCreating || isGeneratingFeatures || isSyncing;
+
   // Main view - spec exists
   return (
     <div className="flex-1 flex flex-col overflow-hidden content-bg" data-testid="spec-view">
@@ -145,9 +192,33 @@ export function SpecView() {
         onSaveClick={saveSpec}
         showActionsPanel={showActionsPanel}
         onToggleActionsPanel={() => setShowActionsPanel(!showActionsPanel)}
+        showSaveButton={mode !== 'view'}
       />
 
-      <SpecEditor value={appSpec} onChange={handleChange} />
+      {/* Mode tabs and content container */}
+      <div className="flex-1 flex flex-col overflow-hidden">
+        {/* Mode tabs bar - inside the content area, centered */}
+        {!isProcessing && (
+          <div className="flex items-center justify-center px-4 py-2 border-b border-border bg-muted/30 relative">
+            <SpecModeTabs mode={mode} onModeChange={handleModeChange} isParseValid={isParseValid} />
+            {/* Show parse error indicator - positioned to the right */}
+            {!isParseValid && parseErrors.length > 0 && (
+              <span className="absolute right-4 text-xs text-destructive">
+                XML has errors - fix in Source mode
+              </span>
+            )}
+          </div>
+        )}
+
+        {/* Show parse error banner if in source mode with errors */}
+        {!isParseValid && parseErrors.length > 0 && mode === 'source' && (
+          <div className="px-4 py-2 bg-destructive/10 border-b border-destructive/20 text-sm text-destructive">
+            <span className="font-medium">XML Parse Errors:</span> {parseErrors.join(', ')}
+          </div>
+        )}
+
+        {renderContent()}
+      </div>
 
       <RegenerateSpecDialog
         open={showRegenerateDialog}
diff --git a/apps/ui/src/components/views/spec-view/components/edit-mode/array-field-editor.tsx b/apps/ui/src/components/views/spec-view/components/edit-mode/array-field-editor.tsx
new file mode 100644
index 00000000..773e691b
--- /dev/null
+++ b/apps/ui/src/components/views/spec-view/components/edit-mode/array-field-editor.tsx
@@ -0,0 +1,106 @@
+import { Plus, X } from 'lucide-react';
+import { Button } from '@/components/ui/button';
+import { Input } from '@/components/ui/input';
+import { Card } from '@/components/ui/card';
+import { useRef, useState, useEffect } from 'react';
+
+interface ArrayFieldEditorProps {
+  values: string[];
+  onChange: (values: string[]) => void;
+  placeholder?: string;
+  addLabel?: string;
+  emptyMessage?: string;
+}
+
+interface ItemWithId {
+  id: string;
+  value: string;
+}
+
+function generateId(): string {
+  return crypto.randomUUID();
+}
+
+export function ArrayFieldEditor({
+  values,
+  onChange,
+  placeholder = 'Enter value...',
+  addLabel = 'Add Item',
+  emptyMessage = 'No items added yet.',
+}: ArrayFieldEditorProps) {
+  // Track items with stable IDs
+  const [items, setItems] = useState<ItemWithId[]>(() =>
+    values.map((value) => ({ id: generateId(), value }))
+  );
+
+  // Track if we're making an internal change to avoid sync loops
+  const isInternalChange = useRef(false);
+
+  // Sync external values to internal items when values change externally
+  useEffect(() => {
+    if (isInternalChange.current) {
+      isInternalChange.current = false;
+      return;
+    }
+
+    // External change - rebuild items with new IDs
+    setItems(values.map((value) => ({ id: generateId(), value })));
+  }, [values]);
+
+  const handleAdd = () => {
+    const newItems = [...items, { id: generateId(), value: '' }];
+    setItems(newItems);
+    isInternalChange.current = true;
+    onChange(newItems.map((item) => item.value));
+  };
+
+  const handleRemove = (id: string) => {
+    const newItems = items.filter((item) => item.id !== id);
+    setItems(newItems);
+    isInternalChange.current = true;
+    onChange(newItems.map((item) => item.value));
+  };
+
+  const handleChange = (id: string, value: string) => {
+    const newItems = items.map((item) => (item.id === id ? { ...item, value } : item));
+    setItems(newItems);
+    isInternalChange.current = true;
+    onChange(newItems.map((item) => item.value));
+  };
+
+  return (
+    <div className="space-y-2">
+      {items.length === 0 ? (
+        <p className="text-sm text-muted-foreground py-2">{emptyMessage}</p>
+      ) : (
+        <div className="space-y-2">
+          {items.map((item) => (
+            <Card key={item.id} className="p-2">
+              <div className="flex items-center gap-2">
+                <Input
+                  value={item.value}
+                  onChange={(e) => handleChange(item.id, e.target.value)}
+                  placeholder={placeholder}
+                  className="flex-1"
+                />
+                <Button
+                  type="button"
+                  variant="ghost"
+                  size="icon"
+                  onClick={() => handleRemove(item.id)}
+                  className="shrink-0 text-muted-foreground hover:text-destructive"
+                >
+                  <X className="w-4 h-4" />
+                </Button>
+              </div>
+            </Card>
+          ))}
+        </div>
+      )}
+      <Button type="button" variant="outline" size="sm" onClick={handleAdd} className="gap-1">
+        <Plus className="w-4 h-4" />
+        {addLabel}
+      </Button>
+    </div>
+  );
+}
diff --git a/apps/ui/src/components/views/spec-view/components/edit-mode/capabilities-section.tsx b/apps/ui/src/components/views/spec-view/components/edit-mode/capabilities-section.tsx
new file mode 100644
index 00000000..cfec2d78
--- /dev/null
+++ b/apps/ui/src/components/views/spec-view/components/edit-mode/capabilities-section.tsx
@@ -0,0 +1,30 @@
+import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
+import { Lightbulb } from 'lucide-react';
+import { ArrayFieldEditor } from './array-field-editor';
+
+interface CapabilitiesSectionProps {
+  capabilities: string[];
+  onChange: (capabilities: string[]) => void;
+}
+
+export function CapabilitiesSection({ capabilities, onChange }: CapabilitiesSectionProps) {
+  return (
+    <Card>
+      <CardHeader className="pb-3">
+        <CardTitle className="flex items-center gap-2 text-lg">
+          <Lightbulb className="w-5 h-5 text-primary" />
+          Core Capabilities
+        </CardTitle>
+      </CardHeader>
+      <CardContent>
+        <ArrayFieldEditor
+          values={capabilities}
+          onChange={onChange}
+          placeholder="e.g., User authentication, Data visualization..."
+          addLabel="Add Capability"
+          emptyMessage="No capabilities defined. Add your core features."
+        />
+      </CardContent>
+    </Card>
+  );
+}
diff --git a/apps/ui/src/components/views/spec-view/components/edit-mode/features-section.tsx b/apps/ui/src/components/views/spec-view/components/edit-mode/features-section.tsx
new file mode 100644
index 00000000..1cdbac2f
--- /dev/null
+++ b/apps/ui/src/components/views/spec-view/components/edit-mode/features-section.tsx
@@ -0,0 +1,261 @@
+import { Plus, X, ChevronDown, ChevronUp, FolderOpen } from 'lucide-react';
+import { useState, useRef, useEffect } from 'react';
+import { Button } from '@/components/ui/button';
+import { Input } from '@/components/ui/input';
+import { Textarea } from '@/components/ui/textarea';
+import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
+import { Label } from '@/components/ui/label';
+import { Badge } from '@/components/ui/badge';
+import { ListChecks } from 'lucide-react';
+import { Collapsible, CollapsibleContent, CollapsibleTrigger } from '@/components/ui/collapsible';
+import type { SpecOutput } from '@automaker/spec-parser';
+
+type Feature = SpecOutput['implemented_features'][number];
+
+interface FeaturesSectionProps {
+  features: Feature[];
+  onChange: (features: Feature[]) => void;
+}
+
+interface FeatureWithId extends Feature {
+  _id: string;
+  _locationIds?: string[];
+}
+
+function generateId(): string {
+  return crypto.randomUUID();
+}
+
+function featureToInternal(feature: Feature): FeatureWithId {
+  return {
+    ...feature,
+    _id: generateId(),
+    _locationIds: feature.file_locations?.map(() => generateId()),
+  };
+}
+
+function internalToFeature(internal: FeatureWithId): Feature {
+  const { _id, _locationIds, ...feature } = internal;
+  return feature;
+}
+
+interface FeatureCardProps {
+  feature: FeatureWithId;
+  index: number;
+  onChange: (feature: FeatureWithId) => void;
+  onRemove: () => void;
+}
+
+function FeatureCard({ feature, index, onChange, onRemove }: FeatureCardProps) {
+  const [isOpen, setIsOpen] = useState(false);
+
+  const handleNameChange = (name: string) => {
+    onChange({ ...feature, name });
+  };
+
+  const handleDescriptionChange = (description: string) => {
+    onChange({ ...feature, description });
+  };
+
+  const handleAddLocation = () => {
+    const locations = feature.file_locations || [];
+    const locationIds = feature._locationIds || [];
+    onChange({
+      ...feature,
+      file_locations: [...locations, ''],
+      _locationIds: [...locationIds, generateId()],
+    });
+  };
+
+  const handleRemoveLocation = (locId: string) => {
+    const locationIds = feature._locationIds || [];
+    const idx = locationIds.indexOf(locId);
+    if (idx === -1) return;
+
+    const newLocations = feature.file_locations?.filter((_, i) => i !== idx);
+    const newLocationIds = locationIds.filter((id) => id !== locId);
+    onChange({
+      ...feature,
+      file_locations: newLocations && newLocations.length > 0 ? newLocations : undefined,
+      _locationIds: newLocationIds.length > 0 ? newLocationIds : undefined,
+    });
+  };
+
+  const handleLocationChange = (locId: string, value: string) => {
+    const locationIds = feature._locationIds || [];
+    const idx = locationIds.indexOf(locId);
+    if (idx === -1) return;
+
+    const locations = [...(feature.file_locations || [])];
+    locations[idx] = value;
+    onChange({ ...feature, file_locations: locations });
+  };
+
+  return (
+    <Card className="border-border">
+      <Collapsible open={isOpen} onOpenChange={setIsOpen}>
+        <div className="flex items-center gap-2 p-3">
+          <CollapsibleTrigger asChild>
+            <Button variant="ghost" size="sm" className="p-1 h-auto">
+              {isOpen ? <ChevronUp className="w-4 h-4" /> : <ChevronDown className="w-4 h-4" />}
+            </Button>
+          </CollapsibleTrigger>
+          <div className="flex-1 min-w-0">
+            <Input
+              value={feature.name}
+              onChange={(e) => handleNameChange(e.target.value)}
+              placeholder="Feature name..."
+              className="font-medium"
+            />
+          </div>
+          <Badge variant="outline" className="shrink-0">
+            #{index + 1}
+          </Badge>
+          <Button
+            type="button"
+            variant="ghost"
+            size="icon"
+            onClick={onRemove}
+            className="shrink-0 text-muted-foreground hover:text-destructive"
+          >
+            <X className="w-4 h-4" />
+          </Button>
+        </div>
+        <CollapsibleContent>
+          <div className="px-3 pb-3 space-y-4 border-t border-border pt-3 ml-10">
+            <div className="space-y-2">
+              <Label>Description</Label>
+              <Textarea
+                value={feature.description}
+                onChange={(e) => handleDescriptionChange(e.target.value)}
+                placeholder="Describe what this feature does..."
+                rows={3}
+              />
+            </div>
+            <div className="space-y-2">
+              <div className="flex items-center justify-between">
+                <Label className="flex items-center gap-1">
+                  <FolderOpen className="w-4 h-4" />
+                  File Locations
+                </Label>
+                <Button
+                  type="button"
+                  variant="outline"
+                  size="sm"
+                  onClick={handleAddLocation}
+                  className="gap-1 h-7"
+                >
+                  <Plus className="w-3 h-3" />
+                  Add
+                </Button>
+              </div>
+              {(feature.file_locations || []).length === 0 ? (
+                <p className="text-sm text-muted-foreground">No file locations specified.</p>
+              ) : (
+                <div className="space-y-2">
+                  {(feature.file_locations || []).map((location, idx) => {
+                    const locId = feature._locationIds?.[idx] || `fallback-${idx}`;
+                    return (
+                      <div key={locId} className="flex items-center gap-2">
+                        <Input
+                          value={location}
+                          onChange={(e) => handleLocationChange(locId, e.target.value)}
+                          placeholder="e.g., src/components/feature.tsx"
+                          className="flex-1 font-mono text-sm"
+                        />
+                        <Button
+                          type="button"
+                          variant="ghost"
+                          size="icon"
+                          onClick={() => handleRemoveLocation(locId)}
+                          className="shrink-0 text-muted-foreground hover:text-destructive h-8 w-8"
+                        >
+                          <X className="w-3 h-3" />
+                        </Button>
+                      </div>
+                    );
+                  })}
+                </div>
+              )}
+            </div>
+          </div>
+        </CollapsibleContent>
+      </Collapsible>
+    </Card>
+  );
+}
+
+export function FeaturesSection({ features, onChange }: FeaturesSectionProps) {
+  // Track features with stable IDs
+  const [items, setItems] = useState<FeatureWithId[]>(() => features.map(featureToInternal));
+
+  // Track if we're making an internal change to avoid sync loops
+  const isInternalChange = useRef(false);
+
+  // Sync external features to internal items when features change externally
+  useEffect(() => {
+    if (isInternalChange.current) {
+      isInternalChange.current = false;
+      return;
+    }
+    setItems(features.map(featureToInternal));
+  }, [features]);
+
+  const handleAdd = () => {
+    const newItems = [...items, featureToInternal({ name: '', description: '' })];
+    setItems(newItems);
+    isInternalChange.current = true;
+    onChange(newItems.map(internalToFeature));
+  };
+
+  const handleRemove = (id: string) => {
+    const newItems = items.filter((item) => item._id !== id);
+    setItems(newItems);
+    isInternalChange.current = true;
+    onChange(newItems.map(internalToFeature));
+  };
+
+  const handleFeatureChange = (id: string, feature: FeatureWithId) => {
+    const newItems = items.map((item) => (item._id === id ? feature : item));
+    setItems(newItems);
+    isInternalChange.current = true;
+    onChange(newItems.map(internalToFeature));
+  };
+
+  return (
+    <Card>
+      <CardHeader className="pb-3">
+        <CardTitle className="flex items-center gap-2 text-lg">
+          <ListChecks className="w-5 h-5 text-primary" />
+          Implemented Features
+          <Badge variant="outline" className="ml-2">
+            {items.length}
+          </Badge>
+        </CardTitle>
+      </CardHeader>
+      <CardContent className="space-y-3">
+        {items.length === 0 ? (
+          <p className="text-sm text-muted-foreground py-2">
+            No features added yet. Click below to add implemented features.
+          </p>
+        ) : (
+          <div className="space-y-2">
+            {items.map((feature, index) => (
+              <FeatureCard
+                key={feature._id}
+                feature={feature}
+                index={index}
+                onChange={(f) => handleFeatureChange(feature._id, f)}
+                onRemove={() => handleRemove(feature._id)}
+              />
+            ))}
+          </div>
+        )}
+        <Button type="button" variant="outline" size="sm" onClick={handleAdd} className="gap-1">
+          <Plus className="w-4 h-4" />
+          Add Feature
+        </Button>
+      </CardContent>
+    </Card>
+  );
+}
diff --git a/apps/ui/src/components/views/spec-view/components/edit-mode/index.ts b/apps/ui/src/components/views/spec-view/components/edit-mode/index.ts
new file mode 100644
index 00000000..aa9b1ebf
--- /dev/null
+++ b/apps/ui/src/components/views/spec-view/components/edit-mode/index.ts
@@ -0,0 +1,7 @@
+export { ArrayFieldEditor } from './array-field-editor';
+export { ProjectInfoSection } from './project-info-section';
+export { TechStackSection } from './tech-stack-section';
+export { CapabilitiesSection } from './capabilities-section';
+export { FeaturesSection } from './features-section';
+export { RoadmapSection } from './roadmap-section';
+export { RequirementsSection, GuidelinesSection } from './optional-sections';
diff --git a/apps/ui/src/components/views/spec-view/components/edit-mode/optional-sections.tsx b/apps/ui/src/components/views/spec-view/components/edit-mode/optional-sections.tsx
new file mode 100644
index 00000000..a71b2170
--- /dev/null
+++ b/apps/ui/src/components/views/spec-view/components/edit-mode/optional-sections.tsx
@@ -0,0 +1,59 @@
+import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
+import { ScrollText, Wrench } from 'lucide-react';
+import { ArrayFieldEditor } from './array-field-editor';
+
+interface RequirementsSectionProps {
+  requirements: string[];
+  onChange: (requirements: string[]) => void;
+}
+
+export function RequirementsSection({ requirements, onChange }: RequirementsSectionProps) {
+  return (
+    <Card>
+      <CardHeader className="pb-3">
+        <CardTitle className="flex items-center gap-2 text-lg">
+          <ScrollText className="w-5 h-5 text-primary" />
+          Additional Requirements
+          <span className="text-sm font-normal text-muted-foreground">(Optional)</span>
+        </CardTitle>
+      </CardHeader>
+      <CardContent>
+        <ArrayFieldEditor
+          values={requirements}
+          onChange={onChange}
+          placeholder="e.g., Node.js >= 18, Docker required..."
+          addLabel="Add Requirement"
+          emptyMessage="No additional requirements specified."
+        />
+      </CardContent>
+    </Card>
+  );
+}
+
+interface GuidelinesSectionProps {
+  guidelines: string[];
+  onChange: (guidelines: string[]) => void;
+}
+
+export function GuidelinesSection({ guidelines, onChange }: GuidelinesSectionProps) {
+  return (
+    <Card>
+      <CardHeader className="pb-3">
+        <CardTitle className="flex items-center gap-2 text-lg">
+          <Wrench className="w-5 h-5 text-primary" />
+          Development Guidelines
+          <span className="text-sm font-normal text-muted-foreground">(Optional)</span>
+        </CardTitle>
+      </CardHeader>
+      <CardContent>
+        <ArrayFieldEditor
+          values={guidelines}
+          onChange={onChange}
+          placeholder="e.g., Follow TypeScript strict mode, use ESLint..."
+          addLabel="Add Guideline"
+          emptyMessage="No development guidelines specified."
+        />
+      </CardContent>
+    </Card>
+  );
+}
diff --git a/apps/ui/src/components/views/spec-view/components/edit-mode/project-info-section.tsx b/apps/ui/src/components/views/spec-view/components/edit-mode/project-info-section.tsx
new file mode 100644
index 00000000..74a25836
--- /dev/null
+++ b/apps/ui/src/components/views/spec-view/components/edit-mode/project-info-section.tsx
@@ -0,0 +1,51 @@
+import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
+import { Input } from '@/components/ui/input';
+import { Textarea } from '@/components/ui/textarea';
+import { Label } from '@/components/ui/label';
+import { FileText } from 'lucide-react';
+
+interface ProjectInfoSectionProps {
+  projectName: string;
+  overview: string;
+  onProjectNameChange: (value: string) => void;
+  onOverviewChange: (value: string) => void;
+}
+
+export function ProjectInfoSection({
+  projectName,
+  overview,
+  onProjectNameChange,
+  onOverviewChange,
+}: ProjectInfoSectionProps) {
+  return (
+    <Card>
+      <CardHeader className="pb-3">
+        <CardTitle className="flex items-center gap-2 text-lg">
+          <FileText className="w-5 h-5 text-primary" />
+          Project Information
+        </CardTitle>
+      </CardHeader>
+      <CardContent className="space-y-4">
+        <div className="space-y-2">
+          <Label htmlFor="project-name">Project Name</Label>
+          <Input
+            id="project-name"
+            value={projectName}
+            onChange={(e) => onProjectNameChange(e.target.value)}
+            placeholder="Enter project name..."
+          />
+        </div>
+        <div className="space-y-2">
+          <Label htmlFor="overview">Overview</Label>
+          <Textarea
+            id="overview"
+            value={overview}
+            onChange={(e) => onOverviewChange(e.target.value)}
+            placeholder="Describe what this project does, its purpose, and key goals..."
+            rows={5}
+          />
+        </div>
+      </CardContent>
+    </Card>
+  );
+}
diff --git a/apps/ui/src/components/views/spec-view/components/edit-mode/roadmap-section.tsx b/apps/ui/src/components/views/spec-view/components/edit-mode/roadmap-section.tsx
new file mode 100644
index 00000000..6275eebd
--- /dev/null
+++ b/apps/ui/src/components/views/spec-view/components/edit-mode/roadmap-section.tsx
@@ -0,0 +1,195 @@
+import { Plus, X, Map as MapIcon } from 'lucide-react';
+import { useState, useRef, useEffect } from 'react';
+import { Button } from '@/components/ui/button';
+import { Input } from '@/components/ui/input';
+import { Textarea } from '@/components/ui/textarea';
+import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
+import { Label } from '@/components/ui/label';
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from '@/components/ui/select';
+import type { SpecOutput } from '@automaker/spec-parser';
+
+type RoadmapPhase = NonNullable<SpecOutput['implementation_roadmap']>[number];
+type PhaseStatus = 'completed' | 'in_progress' | 'pending';
+
+interface PhaseWithId extends RoadmapPhase {
+  _id: string;
+}
+
+function generateId(): string {
+  return crypto.randomUUID();
+}
+
+function phaseToInternal(phase: RoadmapPhase): PhaseWithId {
+  return { ...phase, _id: generateId() };
+}
+
+function internalToPhase(internal: PhaseWithId): RoadmapPhase {
+  const { _id, ...phase } = internal;
+  return phase;
+}
+
+interface RoadmapSectionProps {
+  phases: RoadmapPhase[];
+  onChange: (phases: RoadmapPhase[]) => void;
+}
+
+interface PhaseCardProps {
+  phase: PhaseWithId;
+  onChange: (phase: PhaseWithId) => void;
+  onRemove: () => void;
+}
+
+function PhaseCard({ phase, onChange, onRemove }: PhaseCardProps) {
+  const handlePhaseNameChange = (name: string) => {
+    onChange({ ...phase, phase: name });
+  };
+
+  const handleStatusChange = (status: PhaseStatus) => {
+    onChange({ ...phase, status });
+  };
+
+  const handleDescriptionChange = (description: string) => {
+    onChange({ ...phase, description });
+  };
+
+  return (
+    <Card className="border-border">
+      <div className="p-3 space-y-3">
+        <div className="flex items-start gap-2">
+          <div className="flex-1 space-y-3">
+            <div className="flex flex-col sm:flex-row gap-2">
+              <div className="flex-1">
+                <Label className="sr-only">Phase Name</Label>
+                <Input
+                  value={phase.phase}
+                  onChange={(e) => handlePhaseNameChange(e.target.value)}
+                  placeholder="Phase name..."
+                />
+              </div>
+              <div className="w-full sm:w-40">
+                <Label className="sr-only">Status</Label>
+                <Select value={phase.status} onValueChange={handleStatusChange}>
+                  <SelectTrigger>
+                    <SelectValue placeholder="Status" />
+                  </SelectTrigger>
+                  <SelectContent>
+                    <SelectItem value="pending">Pending</SelectItem>
+                    <SelectItem value="in_progress">In Progress</SelectItem>
+                    <SelectItem value="completed">Completed</SelectItem>
+                  </SelectContent>
+                </Select>
+              </div>
+            </div>
+            <div>
+              <Label className="sr-only">Description</Label>
+              <Textarea
+                value={phase.description ?? ''}
+                onChange={(e) => handleDescriptionChange(e.target.value)}
+                placeholder="Describe what this phase involves..."
+                rows={2}
+              />
+            </div>
+          </div>
+          <Button
+            type="button"
+            variant="ghost"
+            size="icon"
+            onClick={onRemove}
+            className="shrink-0 text-muted-foreground hover:text-destructive"
+          >
+            <X className="w-4 h-4" />
+          </Button>
+        </div>
+      </div>
+    </Card>
+  );
+}
+
+export function RoadmapSection({ phases, onChange }: RoadmapSectionProps) {
+  // Track phases with stable IDs
+  const [items, setItems] = useState<PhaseWithId[]>(() => phases.map(phaseToInternal));
+
+  // Track if we're making an internal change to avoid sync loops
+  const isInternalChange = useRef(false);
+
+  // Sync external phases to internal items when phases change externally
+  // Preserve existing IDs where possible to avoid unnecessary remounts
+  useEffect(() => {
+    if (isInternalChange.current) {
+      isInternalChange.current = false;
+      return;
+    }
+    setItems((currentItems) => {
+      return phases.map((phase, index) => {
+        // Try to find existing item by index (positional matching)
+        const existingItem = currentItems[index];
+        if (existingItem) {
+          // Reuse the existing ID, update the phase data
+          return { ...phase, _id: existingItem._id };
+        }
+        // New phase - generate new ID
+        return phaseToInternal(phase);
+      });
+    });
+  }, [phases]);
+
+  const handleAdd = () => {
+    const newItems = [...items, phaseToInternal({ phase: '', status: 'pending', description: '' })];
+    setItems(newItems);
+    isInternalChange.current = true;
+    onChange(newItems.map(internalToPhase));
+  };
+
+  const handleRemove = (id: string) => {
+    const newItems = items.filter((item) => item._id !== id);
+    setItems(newItems);
+    isInternalChange.current = true;
+    onChange(newItems.map(internalToPhase));
+  };
+
+  const handlePhaseChange = (id: string, phase: PhaseWithId) => {
+    const newItems = items.map((item) => (item._id === id ? phase : item));
+    setItems(newItems);
+    isInternalChange.current = true;
+    onChange(newItems.map(internalToPhase));
+  };
+
+  return (
+    <Card>
+      <CardHeader className="pb-3">
+        <CardTitle className="flex items-center gap-2 text-lg">
+          <MapIcon className="w-5 h-5 text-primary" />
+          Implementation Roadmap
+        </CardTitle>
+      </CardHeader>
+      <CardContent className="space-y-3">
+        {items.length === 0 ? (
+          <p className="text-sm text-muted-foreground py-2">
+            No roadmap phases defined. Add phases to track implementation progress.
+          </p>
+        ) : (
+          <div className="space-y-2">
+            {items.map((phase) => (
+              <PhaseCard
+                key={phase._id}
+                phase={phase}
+                onChange={(p) => handlePhaseChange(phase._id, p)}
+                onRemove={() => handleRemove(phase._id)}
+              />
+            ))}
+          </div>
+        )}
+        <Button type="button" variant="outline" size="sm" onClick={handleAdd} className="gap-1">
+          <Plus className="w-4 h-4" />
+          Add Phase
+        </Button>
+      </CardContent>
+    </Card>
+  );
+}
diff --git a/apps/ui/src/components/views/spec-view/components/edit-mode/tech-stack-section.tsx b/apps/ui/src/components/views/spec-view/components/edit-mode/tech-stack-section.tsx
new file mode 100644
index 00000000..4002049e
--- /dev/null
+++ b/apps/ui/src/components/views/spec-view/components/edit-mode/tech-stack-section.tsx
@@ -0,0 +1,30 @@
+import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
+import { Cpu } from 'lucide-react';
+import { ArrayFieldEditor } from './array-field-editor';
+
+interface TechStackSectionProps {
+  technologies: string[];
+  onChange: (technologies: string[]) => void;
+}
+
+export function TechStackSection({ technologies, onChange }: TechStackSectionProps) {
+  return (
+    <Card>
+      <CardHeader className="pb-3">
+        <CardTitle className="flex items-center gap-2 text-lg">
+          <Cpu className="w-5 h-5 text-primary" />
+          Technology Stack
+        </CardTitle>
+      </CardHeader>
+      <CardContent>
+        <ArrayFieldEditor
+          values={technologies}
+          onChange={onChange}
+          placeholder="e.g., React, TypeScript, Node.js..."
+          addLabel="Add Technology"
+          emptyMessage="No technologies added. Add your tech stack."
+        />
+      </CardContent>
+    </Card>
+  );
+}
diff --git a/apps/ui/src/components/views/spec-view/components/index.ts b/apps/ui/src/components/views/spec-view/components/index.ts
index 07fbbdf3..9773b7ce 100644
--- a/apps/ui/src/components/views/spec-view/components/index.ts
+++ b/apps/ui/src/components/views/spec-view/components/index.ts
@@ -1,3 +1,6 @@
 export { SpecHeader } from './spec-header';
 export { SpecEditor } from './spec-editor';
 export { SpecEmptyState } from './spec-empty-state';
+export { SpecModeTabs } from './spec-mode-tabs';
+export { SpecViewMode } from './spec-view-mode';
+export { SpecEditMode } from './spec-edit-mode';
diff --git a/apps/ui/src/components/views/spec-view/components/spec-edit-mode.tsx b/apps/ui/src/components/views/spec-view/components/spec-edit-mode.tsx
new file mode 100644
index 00000000..39519664
--- /dev/null
+++ b/apps/ui/src/components/views/spec-view/components/spec-edit-mode.tsx
@@ -0,0 +1,118 @@
+import { useState, useCallback, useRef, useEffect } from 'react';
+import type { SpecOutput } from '@automaker/spec-parser';
+import { specToXml } from '@automaker/spec-parser';
+import { ScrollArea } from '@/components/ui/scroll-area';
+import {
+  ProjectInfoSection,
+  TechStackSection,
+  CapabilitiesSection,
+  FeaturesSection,
+  RoadmapSection,
+  RequirementsSection,
+  GuidelinesSection,
+} from './edit-mode';
+
+interface SpecEditModeProps {
+  spec: SpecOutput;
+  onChange: (xmlContent: string) => void;
+}
+
+export function SpecEditMode({ spec, onChange }: SpecEditModeProps) {
+  // Local state for form editing
+  const [formData, setFormData] = useState<SpecOutput>(spec);
+
+  // Track the last spec we synced FROM to detect external changes
+  const lastExternalSpecRef = useRef<string>(JSON.stringify(spec));
+
+  // Flag to prevent re-syncing when we caused the change
+  const isInternalChangeRef = useRef(false);
+
+  // Reset form only when spec changes externally (e.g., after save, sync, or regenerate)
+  useEffect(() => {
+    const specJson = JSON.stringify(spec);
+
+    // If we caused this change (internal), just update the ref and skip reset
+    if (isInternalChangeRef.current) {
+      lastExternalSpecRef.current = specJson;
+      isInternalChangeRef.current = false;
+      return;
+    }
+
+    // External change - reset form data
+    if (specJson !== lastExternalSpecRef.current) {
+      lastExternalSpecRef.current = specJson;
+      setFormData(spec);
+    }
+  }, [spec]);
+
+  // Update a field and notify parent
+  const updateField = useCallback(
+    <K extends keyof SpecOutput>(field: K, value: SpecOutput[K]) => {
+      setFormData((prev) => {
+        const newData = { ...prev, [field]: value };
+        // Mark as internal change before notifying parent
+        isInternalChangeRef.current = true;
+        const xmlContent = specToXml(newData);
+        onChange(xmlContent);
+        return newData;
+      });
+    },
+    [onChange]
+  );
+
+  return (
+    <ScrollArea className="flex-1">
+      <div className="p-4 space-y-6 max-w-4xl mx-auto">
+        {/* Project Information */}
+        <ProjectInfoSection
+          projectName={formData.project_name}
+          overview={formData.overview}
+          onProjectNameChange={(value) => updateField('project_name', value)}
+          onOverviewChange={(value) => updateField('overview', value)}
+        />
+
+        {/* Technology Stack */}
+        <TechStackSection
+          technologies={formData.technology_stack}
+          onChange={(value) => updateField('technology_stack', value)}
+        />
+
+        {/* Core Capabilities */}
+        <CapabilitiesSection
+          capabilities={formData.core_capabilities}
+          onChange={(value) => updateField('core_capabilities', value)}
+        />
+
+        {/* Implemented Features */}
+        <FeaturesSection
+          features={formData.implemented_features}
+          onChange={(value) => updateField('implemented_features', value)}
+        />
+
+        {/* Additional Requirements (Optional) */}
+        <RequirementsSection
+          requirements={formData.additional_requirements || []}
+          onChange={(value) =>
+            updateField('additional_requirements', value.length > 0 ? value : undefined)
+          }
+        />
+
+        {/* Development Guidelines (Optional) */}
+        <GuidelinesSection
+          guidelines={formData.development_guidelines || []}
+          onChange={(value) =>
+            updateField('development_guidelines', value.length > 0 ? value : undefined)
+          }
+        />
+
+        {/* Implementation Roadmap (Optional) */}
+        <RoadmapSection
+          phases={formData.implementation_roadmap || []}
+          onChange={(value) =>
+            updateField('implementation_roadmap', value.length > 0 ? value : undefined)
+          }
+        />
+      </div>
+    </ScrollArea>
+  );
+}
diff --git a/apps/ui/src/components/views/spec-view/components/spec-editor.tsx b/apps/ui/src/components/views/spec-view/components/spec-editor.tsx
index 3df2d6db..aafb568f 100644
--- a/apps/ui/src/components/views/spec-view/components/spec-editor.tsx
+++ b/apps/ui/src/components/views/spec-view/components/spec-editor.tsx
@@ -8,8 +8,8 @@ interface SpecEditorProps {
 
 export function SpecEditor({ value, onChange }: SpecEditorProps) {
   return (
-    <div className="flex-1 p-4 overflow-hidden">
-      <Card className="h-full">
+    <div className="flex-1 p-4 overflow-hidden min-h-0">
+      <Card className="h-full overflow-hidden">
         <XmlSyntaxEditor
           value={value}
           onChange={onChange}
diff --git a/apps/ui/src/components/views/spec-view/components/spec-header.tsx b/apps/ui/src/components/views/spec-view/components/spec-header.tsx
index 72d879dd..4f0016ca 100644
--- a/apps/ui/src/components/views/spec-view/components/spec-header.tsx
+++ b/apps/ui/src/components/views/spec-view/components/spec-header.tsx
@@ -23,6 +23,8 @@ interface SpecHeaderProps {
   onSaveClick: () => void;
   showActionsPanel: boolean;
   onToggleActionsPanel: () => void;
+  // Mode-related props for save button visibility
+  showSaveButton: boolean;
 }
 
 export function SpecHeader({
@@ -41,6 +43,7 @@ export function SpecHeader({
   onSaveClick,
   showActionsPanel,
   onToggleActionsPanel,
+  showSaveButton,
 }: SpecHeaderProps) {
   const isProcessing = isRegenerating || isCreating || isGeneratingFeatures || isSyncing;
   const phaseLabel = PHASE_LABELS[currentPhase] || currentPhase;
@@ -133,15 +136,17 @@ export function SpecHeader({
                 <ListPlus className="w-4 h-4 mr-2" />
                 Generate Features
               </Button>
-              <Button
-                size="sm"
-                onClick={onSaveClick}
-                disabled={!hasChanges || isSaving}
-                data-testid="save-spec"
-              >
-                <Save className="w-4 h-4 mr-2" />
-                {isSaving ? 'Saving...' : hasChanges ? 'Save Changes' : 'Saved'}
-              </Button>
+              {showSaveButton && (
+                <Button
+                  size="sm"
+                  onClick={onSaveClick}
+                  disabled={!hasChanges || isSaving}
+                  data-testid="save-spec"
+                >
+                  <Save className="w-4 h-4 mr-2" />
+                  {isSaving ? 'Saving...' : hasChanges ? 'Save Changes' : 'Saved'}
+                </Button>
+              )}
             </div>
           )}
           {/* Tablet/Mobile: show trigger for actions panel */}
@@ -212,15 +217,17 @@ export function SpecHeader({
               <ListPlus className="w-4 h-4 mr-2" />
               Generate Features
             </Button>
-            <Button
-              className="w-full justify-start"
-              onClick={onSaveClick}
-              disabled={!hasChanges || isSaving}
-              data-testid="save-spec-mobile"
-            >
-              <Save className="w-4 h-4 mr-2" />
-              {isSaving ? 'Saving...' : hasChanges ? 'Save Changes' : 'Saved'}
-            </Button>
+            {showSaveButton && (
+              <Button
+                className="w-full justify-start"
+                onClick={onSaveClick}
+                disabled={!hasChanges || isSaving}
+                data-testid="save-spec-mobile"
+              >
+                <Save className="w-4 h-4 mr-2" />
+                {isSaving ? 'Saving...' : hasChanges ? 'Save Changes' : 'Saved'}
+              </Button>
+            )}
           </>
         )}
       </HeaderActionsPanel>
diff --git a/apps/ui/src/components/views/spec-view/components/spec-mode-tabs.tsx b/apps/ui/src/components/views/spec-view/components/spec-mode-tabs.tsx
new file mode 100644
index 00000000..f57c07f0
--- /dev/null
+++ b/apps/ui/src/components/views/spec-view/components/spec-mode-tabs.tsx
@@ -0,0 +1,55 @@
+import { Eye, Edit3, Code } from 'lucide-react';
+import { Tabs, TabsList, TabsTrigger } from '@/components/ui/tabs';
+import type { SpecViewMode } from '../types';
+
+interface SpecModeTabsProps {
+  mode: SpecViewMode;
+  onModeChange: (mode: SpecViewMode) => void;
+  isParseValid: boolean;
+  disabled?: boolean;
+}
+
+export function SpecModeTabs({
+  mode,
+  onModeChange,
+  isParseValid,
+  disabled = false,
+}: SpecModeTabsProps) {
+  const handleValueChange = (value: string) => {
+    onModeChange(value as SpecViewMode);
+  };
+
+  return (
+    <Tabs value={mode} onValueChange={handleValueChange}>
+      <TabsList>
+        <TabsTrigger
+          value="view"
+          disabled={disabled || !isParseValid}
+          title={!isParseValid ? 'Fix XML errors to enable View mode' : 'View formatted spec'}
+          aria-label="View"
+        >
+          <Eye className="w-4 h-4" />
+          <span className="hidden sm:inline">View</span>
+        </TabsTrigger>
+        <TabsTrigger
+          value="edit"
+          disabled={disabled || !isParseValid}
+          title={!isParseValid ? 'Fix XML errors to enable Edit mode' : 'Edit spec with form'}
+          aria-label="Edit"
+        >
+          <Edit3 className="w-4 h-4" />
+          <span className="hidden sm:inline">Edit</span>
+        </TabsTrigger>
+        <TabsTrigger
+          value="source"
+          disabled={disabled}
+          title="Edit raw XML source"
+          aria-label="Source"
+        >
+          <Code className="w-4 h-4" />
+          <span className="hidden sm:inline">Source</span>
+        </TabsTrigger>
+      </TabsList>
+    </Tabs>
+  );
+}
diff --git a/apps/ui/src/components/views/spec-view/components/spec-view-mode.tsx b/apps/ui/src/components/views/spec-view/components/spec-view-mode.tsx
new file mode 100644
index 00000000..29255334
--- /dev/null
+++ b/apps/ui/src/components/views/spec-view/components/spec-view-mode.tsx
@@ -0,0 +1,223 @@
+import type { SpecOutput } from '@automaker/spec-parser';
+import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
+import { Badge } from '@/components/ui/badge';
+import { ScrollArea } from '@/components/ui/scroll-area';
+import {
+  Accordion,
+  AccordionContent,
+  AccordionItem,
+  AccordionTrigger,
+} from '@/components/ui/accordion';
+import {
+  CheckCircle2,
+  Circle,
+  Clock,
+  Cpu,
+  FileCode2,
+  FolderOpen,
+  Lightbulb,
+  ListChecks,
+  Map as MapIcon,
+  ScrollText,
+  Wrench,
+} from 'lucide-react';
+
+interface SpecViewModeProps {
+  spec: SpecOutput;
+}
+
+function StatusBadge({ status }: { status: 'completed' | 'in_progress' | 'pending' }) {
+  const variants = {
+    completed: { variant: 'success' as const, icon: CheckCircle2, label: 'Completed' },
+    in_progress: { variant: 'warning' as const, icon: Clock, label: 'In Progress' },
+    pending: { variant: 'muted' as const, icon: Circle, label: 'Pending' },
+  };
+
+  const { variant, icon: Icon, label } = variants[status];
+
+  return (
+    <Badge variant={variant} className="gap-1">
+      <Icon className="w-3 h-3" />
+      {label}
+    </Badge>
+  );
+}
+
+export function SpecViewMode({ spec }: SpecViewModeProps) {
+  return (
+    <ScrollArea className="h-full">
+      <div className="p-4 space-y-6 max-w-4xl mx-auto">
+        {/* Project Header */}
+        <div className="space-y-3">
+          <h1 className="text-3xl font-bold tracking-tight">{spec.project_name}</h1>
+          <p className="text-muted-foreground text-lg leading-relaxed">{spec.overview}</p>
+        </div>
+
+        {/* Technology Stack */}
+        <Card>
+          <CardHeader className="pb-3">
+            <CardTitle className="flex items-center gap-2 text-lg">
+              <Cpu className="w-5 h-5 text-primary" />
+              Technology Stack
+            </CardTitle>
+          </CardHeader>
+          <CardContent>
+            <div className="flex flex-wrap gap-2">
+              {spec.technology_stack.map((tech, index) => (
+                <Badge key={index} variant="secondary" className="text-sm">
+                  {tech}
+                </Badge>
+              ))}
+            </div>
+          </CardContent>
+        </Card>
+
+        {/* Core Capabilities */}
+        <Card>
+          <CardHeader className="pb-3">
+            <CardTitle className="flex items-center gap-2 text-lg">
+              <Lightbulb className="w-5 h-5 text-primary" />
+              Core Capabilities
+            </CardTitle>
+          </CardHeader>
+          <CardContent>
+            <ul className="space-y-2">
+              {spec.core_capabilities.map((capability, index) => (
+                <li key={index} className="flex items-start gap-2">
+                  <CheckCircle2 className="w-4 h-4 text-green-500 mt-1 shrink-0" />
+                  <span>{capability}</span>
+                </li>
+              ))}
+            </ul>
+          </CardContent>
+        </Card>
+
+        {/* Implemented Features */}
+        {spec.implemented_features.length > 0 && (
+          <Card>
+            <CardHeader className="pb-3">
+              <CardTitle className="flex items-center gap-2 text-lg">
+                <ListChecks className="w-5 h-5 text-primary" />
+                Implemented Features
+                <Badge variant="outline" className="ml-2">
+                  {spec.implemented_features.length}
+                </Badge>
+              </CardTitle>
+            </CardHeader>
+            <CardContent className="pt-0">
+              <Accordion type="multiple" className="w-full">
+                {spec.implemented_features.map((feature, index) => (
+                  <AccordionItem key={index} value={`feature-${index}`}>
+                    <AccordionTrigger className="hover:no-underline">
+                      <div className="flex items-center gap-2 text-left">
+                        <FileCode2 className="w-4 h-4 text-muted-foreground shrink-0" />
+                        <span className="font-medium">{feature.name}</span>
+                      </div>
+                    </AccordionTrigger>
+                    <AccordionContent>
+                      <div className="space-y-3 pl-6">
+                        <p className="text-muted-foreground">{feature.description}</p>
+                        {feature.file_locations && feature.file_locations.length > 0 && (
+                          <div className="space-y-1">
+                            <p className="text-sm font-medium flex items-center gap-1">
+                              <FolderOpen className="w-4 h-4" />
+                              File Locations:
+                            </p>
+                            <ul className="text-sm text-muted-foreground space-y-1">
+                              {feature.file_locations.map((loc, locIndex) => (
+                                <li
+                                  key={locIndex}
+                                  className="font-mono text-xs bg-muted px-2 py-1 rounded"
+                                >
+                                  {loc}
+                                </li>
+                              ))}
+                            </ul>
+                          </div>
+                        )}
+                      </div>
+                    </AccordionContent>
+                  </AccordionItem>
+                ))}
+              </Accordion>
+            </CardContent>
+          </Card>
+        )}
+
+        {/* Additional Requirements */}
+        {spec.additional_requirements && spec.additional_requirements.length > 0 && (
+          <Card>
+            <CardHeader className="pb-3">
+              <CardTitle className="flex items-center gap-2 text-lg">
+                <ScrollText className="w-5 h-5 text-primary" />
+                Additional Requirements
+              </CardTitle>
+            </CardHeader>
+            <CardContent>
+              <ul className="space-y-2">
+                {spec.additional_requirements.map((req, index) => (
+                  <li key={index} className="flex items-start gap-2">
+                    <Circle className="w-2 h-2 text-muted-foreground mt-2 shrink-0 fill-current" />
+                    <span>{req}</span>
+                  </li>
+                ))}
+              </ul>
+            </CardContent>
+          </Card>
+        )}
+
+        {/* Development Guidelines */}
+        {spec.development_guidelines && spec.development_guidelines.length > 0 && (
+          <Card>
+            <CardHeader className="pb-3">
+              <CardTitle className="flex items-center gap-2 text-lg">
+                <Wrench className="w-5 h-5 text-primary" />
+                Development Guidelines
+              </CardTitle>
+            </CardHeader>
+            <CardContent>
+              <ul className="space-y-2">
+                {spec.development_guidelines.map((guideline, index) => (
+                  <li key={index} className="flex items-start gap-2">
+                    <Circle className="w-2 h-2 text-muted-foreground mt-2 shrink-0 fill-current" />
+                    <span>{guideline}</span>
+                  </li>
+                ))}
+              </ul>
+            </CardContent>
+          </Card>
+        )}
+
+        {/* Implementation Roadmap */}
+        {spec.implementation_roadmap && spec.implementation_roadmap.length > 0 && (
+          <Card>
+            <CardHeader className="pb-3">
+              <CardTitle className="flex items-center gap-2 text-lg">
+                <MapIcon className="w-5 h-5 text-primary" />
+                Implementation Roadmap
+              </CardTitle>
+            </CardHeader>
+            <CardContent>
+              <div className="space-y-4">
+                {spec.implementation_roadmap.map((phase, index) => (
+                  <div
+                    key={index}
+                    className="flex flex-col sm:flex-row sm:items-start gap-2 sm:gap-4 p-3 rounded-lg bg-muted/50"
+                  >
+                    <div className="flex items-center gap-2 sm:w-48 shrink-0">
+                      <StatusBadge status={phase.status} />
+                    </div>
+                    <div className="flex-1">
+                      <p className="font-medium">{phase.phase}</p>
+                      <p className="text-sm text-muted-foreground">{phase.description}</p>
+                    </div>
+                  </div>
+                ))}
+              </div>
+            </CardContent>
+          </Card>
+        )}
+      </div>
+    </ScrollArea>
+  );
+}
diff --git a/apps/ui/src/components/views/spec-view/hooks/index.ts b/apps/ui/src/components/views/spec-view/hooks/index.ts
index 5e2309f8..330766f5 100644
--- a/apps/ui/src/components/views/spec-view/hooks/index.ts
+++ b/apps/ui/src/components/views/spec-view/hooks/index.ts
@@ -1,3 +1,5 @@
 export { useSpecLoading } from './use-spec-loading';
 export { useSpecSave } from './use-spec-save';
 export { useSpecGeneration } from './use-spec-generation';
+export { useSpecParser } from './use-spec-parser';
+export type { UseSpecParserResult } from './use-spec-parser';
diff --git a/apps/ui/src/components/views/spec-view/hooks/use-spec-parser.ts b/apps/ui/src/components/views/spec-view/hooks/use-spec-parser.ts
new file mode 100644
index 00000000..ba6c0266
--- /dev/null
+++ b/apps/ui/src/components/views/spec-view/hooks/use-spec-parser.ts
@@ -0,0 +1,61 @@
+import { useMemo } from 'react';
+import {
+  xmlToSpec,
+  isValidSpecXml,
+  type ParseResult,
+  type SpecOutput,
+} from '@automaker/spec-parser';
+
+/**
+ * Result of the spec parsing hook.
+ */
+export interface UseSpecParserResult {
+  /** Whether the XML is valid */
+  isValid: boolean;
+  /** The parsed spec object, or null if parsing failed */
+  parsedSpec: SpecOutput | null;
+  /** Parsing errors, if any */
+  errors: string[];
+  /** The full parse result */
+  parseResult: ParseResult | null;
+}
+
+/**
+ * Hook to parse XML spec content into a SpecOutput object.
+ * Memoizes the parsing result to avoid unnecessary re-parsing.
+ *
+ * @param xmlContent - The raw XML content from app_spec.txt
+ * @returns Parsed spec data with validation status
+ */
+export function useSpecParser(xmlContent: string): UseSpecParserResult {
+  return useMemo(() => {
+    if (!xmlContent || !xmlContent.trim()) {
+      return {
+        isValid: false,
+        parsedSpec: null,
+        errors: ['No spec content provided'],
+        parseResult: null,
+      };
+    }
+
+    // Quick structure check first
+    if (!isValidSpecXml(xmlContent)) {
+      return {
+        isValid: false,
+        parsedSpec: null,
+        errors: ['Invalid XML structure - missing required elements'],
+        parseResult: null,
+      };
+    }
+
+    // Full parse
+    const parseResult = xmlToSpec(xmlContent);
+
+    return {
+      isValid: parseResult.success,
+      parsedSpec: parseResult.spec,
+      errors: parseResult.errors,
+      parseResult,
+    };
+  }, [xmlContent]);
+}
diff --git a/apps/ui/src/components/views/spec-view/types.ts b/apps/ui/src/components/views/spec-view/types.ts
index 084909e9..0000b0d7 100644
--- a/apps/ui/src/components/views/spec-view/types.ts
+++ b/apps/ui/src/components/views/spec-view/types.ts
@@ -1,3 +1,6 @@
+// Spec view mode - determines how the spec is displayed/edited
+export type SpecViewMode = 'view' | 'edit' | 'source';
+
 // Feature count options for spec generation
 export type FeatureCount = 20 | 50 | 100;
 
diff --git a/libs/spec-parser/package.json b/libs/spec-parser/package.json
new file mode 100644
index 00000000..4d003f7f
--- /dev/null
+++ b/libs/spec-parser/package.json
@@ -0,0 +1,39 @@
+{
+  "name": "@automaker/spec-parser",
+  "version": "1.0.0",
+  "type": "module",
+  "description": "XML spec parser for AutoMaker - parses and generates app_spec.txt XML",
+  "main": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "default": "./dist/index.js"
+    }
+  },
+  "scripts": {
+    "build": "tsc",
+    "watch": "tsc --watch",
+    "test": "vitest run",
+    "test:watch": "vitest"
+  },
+  "keywords": [
+    "automaker",
+    "spec-parser",
+    "xml"
+  ],
+  "author": "AutoMaker Team",
+  "license": "SEE LICENSE IN LICENSE",
+  "engines": {
+    "node": ">=22.0.0 <23.0.0"
+  },
+  "dependencies": {
+    "@automaker/types": "1.0.0",
+    "fast-xml-parser": "^5.3.3"
+  },
+  "devDependencies": {
+    "@types/node": "22.19.3",
+    "typescript": "5.9.3",
+    "vitest": "4.0.16"
+  }
+}
diff --git a/libs/spec-parser/src/index.ts b/libs/spec-parser/src/index.ts
new file mode 100644
index 00000000..37fb9221
--- /dev/null
+++ b/libs/spec-parser/src/index.ts
@@ -0,0 +1,26 @@
+/**
+ * @automaker/spec-parser
+ *
+ * XML spec parser for AutoMaker - parses and generates app_spec.txt XML.
+ * This package provides utilities for:
+ * - Parsing XML spec content into SpecOutput objects
+ * - Converting SpecOutput objects back to XML
+ * - Validating spec data
+ */
+
+// Re-export types from @automaker/types for convenience
+export type { SpecOutput } from '@automaker/types';
+
+// XML utilities
+export { escapeXml, unescapeXml, extractXmlSection, extractXmlElements } from './xml-utils.js';
+
+// XML to Spec parsing
+export { xmlToSpec } from './xml-to-spec.js';
+export type { ParseResult } from './xml-to-spec.js';
+
+// Spec to XML conversion
+export { specToXml } from './spec-to-xml.js';
+
+// Validation
+export { validateSpec, isValidSpecXml } from './validate.js';
+export type { ValidationResult } from './validate.js';
diff --git a/libs/spec-parser/src/spec-to-xml.ts b/libs/spec-parser/src/spec-to-xml.ts
new file mode 100644
index 00000000..c79a7a38
--- /dev/null
+++ b/libs/spec-parser/src/spec-to-xml.ts
@@ -0,0 +1,88 @@
+/**
+ * SpecOutput to XML converter.
+ * Converts a structured SpecOutput object back to XML format.
+ */
+
+import type { SpecOutput } from '@automaker/types';
+import { escapeXml } from './xml-utils.js';
+
+/**
+ * Convert structured spec output to XML format.
+ *
+ * @param spec - The SpecOutput object to convert
+ * @returns XML string formatted for app_spec.txt
+ */
+export function specToXml(spec: SpecOutput): string {
+  const indent = '  ';
+
+  let xml = `<?xml version="1.0" encoding="UTF-8"?>
+<project_specification>
+${indent}<project_name>${escapeXml(spec.project_name)}</project_name>
+
+${indent}<overview>
+${indent}${indent}${escapeXml(spec.overview)}
+${indent}</overview>
+
+${indent}<technology_stack>
+${spec.technology_stack.map((t) => `${indent}${indent}<technology>${escapeXml(t)}</technology>`).join('\n')}
+${indent}</technology_stack>
+
+${indent}<core_capabilities>
+${spec.core_capabilities.map((c) => `${indent}${indent}<capability>${escapeXml(c)}</capability>`).join('\n')}
+${indent}</core_capabilities>
+
+${indent}<implemented_features>
+${spec.implemented_features
+  .map(
+    (f) => `${indent}${indent}<feature>
+${indent}${indent}${indent}<name>${escapeXml(f.name)}</name>
+${indent}${indent}${indent}<description>${escapeXml(f.description)}</description>${
+      f.file_locations && f.file_locations.length > 0
+        ? `\n${indent}${indent}${indent}<file_locations>
+${f.file_locations.map((loc) => `${indent}${indent}${indent}${indent}<location>${escapeXml(loc)}</location>`).join('\n')}
+${indent}${indent}${indent}</file_locations>`
+        : ''
+    }
+${indent}${indent}</feature>`
+  )
+  .join('\n')}
+${indent}</implemented_features>`;
+
+  // Optional sections
+  if (spec.additional_requirements && spec.additional_requirements.length > 0) {
+    xml += `
+
+${indent}<additional_requirements>
+${spec.additional_requirements.map((r) => `${indent}${indent}<requirement>${escapeXml(r)}</requirement>`).join('\n')}
+${indent}</additional_requirements>`;
+  }
+
+  if (spec.development_guidelines && spec.development_guidelines.length > 0) {
+    xml += `
+
+${indent}<development_guidelines>
+${spec.development_guidelines.map((g) => `${indent}${indent}<guideline>${escapeXml(g)}</guideline>`).join('\n')}
+${indent}</development_guidelines>`;
+  }
+
+  if (spec.implementation_roadmap && spec.implementation_roadmap.length > 0) {
+    xml += `
+
+${indent}<implementation_roadmap>
+${spec.implementation_roadmap
+  .map(
+    (r) => `${indent}${indent}<phase>
+${indent}${indent}${indent}<name>${escapeXml(r.phase)}</name>
+${indent}${indent}${indent}<status>${escapeXml(r.status)}</status>
+${indent}${indent}${indent}<description>${escapeXml(r.description)}</description>
+${indent}${indent}</phase>`
+  )
+  .join('\n')}
+${indent}</implementation_roadmap>`;
+  }
+
+  xml += `
+</project_specification>`;
+
+  return xml;
+}
diff --git a/libs/spec-parser/src/validate.ts b/libs/spec-parser/src/validate.ts
new file mode 100644
index 00000000..0d74dcd7
--- /dev/null
+++ b/libs/spec-parser/src/validate.ts
@@ -0,0 +1,143 @@
+/**
+ * Validation utilities for SpecOutput objects.
+ */
+
+import type { SpecOutput } from '@automaker/types';
+
+/**
+ * Validation result containing errors if any.
+ */
+export interface ValidationResult {
+  valid: boolean;
+  errors: string[];
+}
+
+/**
+ * Validate a SpecOutput object for required fields and data integrity.
+ *
+ * @param spec - The SpecOutput object to validate
+ * @returns ValidationResult with errors if validation fails
+ */
+export function validateSpec(spec: SpecOutput | null | undefined): ValidationResult {
+  const errors: string[] = [];
+
+  if (!spec) {
+    return { valid: false, errors: ['Spec is null or undefined'] };
+  }
+
+  // Required string fields
+  if (!spec.project_name || typeof spec.project_name !== 'string') {
+    errors.push('project_name is required and must be a string');
+  } else if (spec.project_name.trim().length === 0) {
+    errors.push('project_name cannot be empty');
+  }
+
+  if (!spec.overview || typeof spec.overview !== 'string') {
+    errors.push('overview is required and must be a string');
+  } else if (spec.overview.trim().length === 0) {
+    errors.push('overview cannot be empty');
+  }
+
+  // Required array fields
+  if (!Array.isArray(spec.technology_stack)) {
+    errors.push('technology_stack is required and must be an array');
+  } else if (spec.technology_stack.length === 0) {
+    errors.push('technology_stack must have at least one item');
+  } else if (spec.technology_stack.some((t) => typeof t !== 'string' || t.trim() === '')) {
+    errors.push('technology_stack items must be non-empty strings');
+  }
+
+  if (!Array.isArray(spec.core_capabilities)) {
+    errors.push('core_capabilities is required and must be an array');
+  } else if (spec.core_capabilities.length === 0) {
+    errors.push('core_capabilities must have at least one item');
+  } else if (spec.core_capabilities.some((c) => typeof c !== 'string' || c.trim() === '')) {
+    errors.push('core_capabilities items must be non-empty strings');
+  }
+
+  // Implemented features
+  if (!Array.isArray(spec.implemented_features)) {
+    errors.push('implemented_features is required and must be an array');
+  } else {
+    spec.implemented_features.forEach((f, i) => {
+      if (!f.name || typeof f.name !== 'string' || f.name.trim() === '') {
+        errors.push(`implemented_features[${i}].name is required and must be a non-empty string`);
+      }
+      if (!f.description || typeof f.description !== 'string') {
+        errors.push(`implemented_features[${i}].description is required and must be a string`);
+      }
+      if (f.file_locations !== undefined) {
+        if (!Array.isArray(f.file_locations)) {
+          errors.push(`implemented_features[${i}].file_locations must be an array if provided`);
+        } else if (f.file_locations.some((loc) => typeof loc !== 'string' || loc.trim() === '')) {
+          errors.push(`implemented_features[${i}].file_locations items must be non-empty strings`);
+        }
+      }
+    });
+  }
+
+  // Optional array fields
+  if (spec.additional_requirements !== undefined) {
+    if (!Array.isArray(spec.additional_requirements)) {
+      errors.push('additional_requirements must be an array if provided');
+    } else if (spec.additional_requirements.some((r) => typeof r !== 'string' || r.trim() === '')) {
+      errors.push('additional_requirements items must be non-empty strings');
+    }
+  }
+
+  if (spec.development_guidelines !== undefined) {
+    if (!Array.isArray(spec.development_guidelines)) {
+      errors.push('development_guidelines must be an array if provided');
+    } else if (spec.development_guidelines.some((g) => typeof g !== 'string' || g.trim() === '')) {
+      errors.push('development_guidelines items must be non-empty strings');
+    }
+  }
+
+  // Implementation roadmap
+  if (spec.implementation_roadmap !== undefined) {
+    if (!Array.isArray(spec.implementation_roadmap)) {
+      errors.push('implementation_roadmap must be an array if provided');
+    } else {
+      const validStatuses = ['completed', 'in_progress', 'pending'];
+      spec.implementation_roadmap.forEach((r, i) => {
+        if (!r.phase || typeof r.phase !== 'string' || r.phase.trim() === '') {
+          errors.push(
+            `implementation_roadmap[${i}].phase is required and must be a non-empty string`
+          );
+        }
+        if (!r.status || !validStatuses.includes(r.status)) {
+          errors.push(
+            `implementation_roadmap[${i}].status must be one of: ${validStatuses.join(', ')}`
+          );
+        }
+        if (!r.description || typeof r.description !== 'string') {
+          errors.push(`implementation_roadmap[${i}].description is required and must be a string`);
+        }
+      });
+    }
+  }
+
+  return { valid: errors.length === 0, errors };
+}
+
+/**
+ * Check if XML content appears to be a valid spec XML (basic structure check).
+ * This is a quick check, not a full validation.
+ *
+ * @param xmlContent - The XML content to check
+ * @returns true if the content appears to be valid spec XML
+ */
+export function isValidSpecXml(xmlContent: string): boolean {
+  if (!xmlContent || typeof xmlContent !== 'string') {
+    return false;
+  }
+
+  // Check for essential elements
+  const hasRoot = xmlContent.includes('<project_specification>');
+  const hasProjectName = /<project_name>[\s\S]*?<\/project_name>/.test(xmlContent);
+  const hasOverview = /<overview>[\s\S]*?<\/overview>/.test(xmlContent);
+  const hasTechStack = /<technology_stack>[\s\S]*?<\/technology_stack>/.test(xmlContent);
+  const hasCapabilities = /<core_capabilities>[\s\S]*?<\/core_capabilities>/.test(xmlContent);
+
+  return hasRoot && hasProjectName && hasOverview && hasTechStack && hasCapabilities;
+}
diff --git a/libs/spec-parser/src/xml-to-spec.ts b/libs/spec-parser/src/xml-to-spec.ts
new file mode 100644
index 00000000..fb437f2e
--- /dev/null
+++ b/libs/spec-parser/src/xml-to-spec.ts
@@ -0,0 +1,232 @@
+/**
+ * XML to SpecOutput parser.
+ * Parses app_spec.txt XML content into a structured SpecOutput object.
+ * Uses fast-xml-parser for robust XML parsing.
+ */
+
+import { XMLParser } from 'fast-xml-parser';
+import type { SpecOutput } from '@automaker/types';
+
+/**
+ * Result of parsing XML content.
+ */
+export interface ParseResult {
+  success: boolean;
+  spec: SpecOutput | null;
+  errors: string[];
+}
+
+// Configure the XML parser
+const parser = new XMLParser({
+  ignoreAttributes: true,
+  trimValues: true,
+  // Preserve arrays for elements that can have multiple values
+  isArray: (name) => {
+    return [
+      'technology',
+      'capability',
+      'feature',
+      'location',
+      'requirement',
+      'guideline',
+      'phase',
+    ].includes(name);
+  },
+});
+
+/**
+ * Safely get a string value from parsed XML, handling various input types.
+ */
+function getString(value: unknown): string {
+  if (typeof value === 'string') return value.trim();
+  if (typeof value === 'number') return String(value);
+  if (value === null || value === undefined) return '';
+  return '';
+}
+
+/**
+ * Safely get an array of strings from parsed XML.
+ */
+function getStringArray(value: unknown): string[] {
+  if (!value) return [];
+  if (Array.isArray(value)) {
+    return value.map((item) => getString(item)).filter((s) => s.length > 0);
+  }
+  const str = getString(value);
+  return str ? [str] : [];
+}
+
+/**
+ * Parse implemented features from the parsed XML object.
+ */
+function parseImplementedFeatures(featuresSection: unknown): SpecOutput['implemented_features'] {
+  const features: SpecOutput['implemented_features'] = [];
+
+  if (!featuresSection || typeof featuresSection !== 'object') {
+    return features;
+  }
+
+  const section = featuresSection as Record<string, unknown>;
+  const featureList = section.feature;
+
+  if (!featureList) return features;
+
+  const featureArray = Array.isArray(featureList) ? featureList : [featureList];
+
+  for (const feature of featureArray) {
+    if (typeof feature !== 'object' || feature === null) continue;
+
+    const f = feature as Record<string, unknown>;
+    const name = getString(f.name);
+    const description = getString(f.description);
+
+    if (!name) continue;
+
+    const locationsSection = f.file_locations as Record<string, unknown> | undefined;
+    const file_locations = locationsSection ? getStringArray(locationsSection.location) : undefined;
+
+    features.push({
+      name,
+      description,
+      ...(file_locations && file_locations.length > 0 ? { file_locations } : {}),
+    });
+  }
+
+  return features;
+}
+
+/**
+ * Parse implementation roadmap phases from the parsed XML object.
+ */
+function parseImplementationRoadmap(roadmapSection: unknown): SpecOutput['implementation_roadmap'] {
+  if (!roadmapSection || typeof roadmapSection !== 'object') {
+    return undefined;
+  }
+
+  const section = roadmapSection as Record<string, unknown>;
+  const phaseList = section.phase;
+
+  if (!phaseList) return undefined;
+
+  const phaseArray = Array.isArray(phaseList) ? phaseList : [phaseList];
+  const roadmap: NonNullable<SpecOutput['implementation_roadmap']> = [];
+
+  for (const phase of phaseArray) {
+    if (typeof phase !== 'object' || phase === null) continue;
+
+    const p = phase as Record<string, unknown>;
+    const phaseName = getString(p.name);
+    const statusRaw = getString(p.status);
+    const description = getString(p.description);
+
+    if (!phaseName) continue;
+
+    const status = (
+      ['completed', 'in_progress', 'pending'].includes(statusRaw) ? statusRaw : 'pending'
+    ) as 'completed' | 'in_progress' | 'pending';
+
+    roadmap.push({ phase: phaseName, status, description });
+  }
+
+  return roadmap.length > 0 ? roadmap : undefined;
+}
+
+/**
+ * Parse XML content into a SpecOutput object.
+ *
+ * @param xmlContent - The raw XML content from app_spec.txt
+ * @returns ParseResult with the parsed spec or errors
+ */
+export function xmlToSpec(xmlContent: string): ParseResult {
+  const errors: string[] = [];
+
+  // Check for root element before parsing
+  if (!xmlContent.includes('<project_specification>')) {
+    return {
+      success: false,
+      spec: null,
+      errors: ['Missing <project_specification> root element'],
+    };
+  }
+
+  // Parse the XML
+  let parsed: Record<string, unknown>;
+  try {
+    parsed = parser.parse(xmlContent) as Record<string, unknown>;
+  } catch (e) {
+    return {
+      success: false,
+      spec: null,
+      errors: [`XML parsing error: ${e instanceof Error ? e.message : 'Unknown error'}`],
+    };
+  }
+
+  const root = parsed.project_specification as Record<string, unknown> | undefined;
+
+  if (!root) {
+    return {
+      success: false,
+      spec: null,
+      errors: ['Missing <project_specification> root element'],
+    };
+  }
+
+  // Extract required fields
+  const project_name = getString(root.project_name);
+  if (!project_name) {
+    errors.push('Missing or empty <project_name>');
+  }
+
+  const overview = getString(root.overview);
+  if (!overview) {
+    errors.push('Missing or empty <overview>');
+  }
+
+  // Extract technology stack
+  const techSection = root.technology_stack as Record<string, unknown> | undefined;
+  const technology_stack = techSection ? getStringArray(techSection.technology) : [];
+  if (technology_stack.length === 0) {
+    errors.push('Missing or empty <technology_stack>');
+  }
+
+  // Extract core capabilities
+  const capSection = root.core_capabilities as Record<string, unknown> | undefined;
+  const core_capabilities = capSection ? getStringArray(capSection.capability) : [];
+  if (core_capabilities.length === 0) {
+    errors.push('Missing or empty <core_capabilities>');
+  }
+
+  // Extract implemented features
+  const implemented_features = parseImplementedFeatures(root.implemented_features);
+
+  // Extract optional sections
+  const reqSection = root.additional_requirements as Record<string, unknown> | undefined;
+  const additional_requirements = reqSection ? getStringArray(reqSection.requirement) : undefined;
+
+  const guideSection = root.development_guidelines as Record<string, unknown> | undefined;
+  const development_guidelines = guideSection ? getStringArray(guideSection.guideline) : undefined;
+
+  const implementation_roadmap = parseImplementationRoadmap(root.implementation_roadmap);
+
+  // Build spec object
+  const spec: SpecOutput = {
+    project_name,
+    overview,
+    technology_stack,
+    core_capabilities,
+    implemented_features,
+    ...(additional_requirements && additional_requirements.length > 0
+      ? { additional_requirements }
+      : {}),
+    ...(development_guidelines && development_guidelines.length > 0
+      ? { development_guidelines }
+      : {}),
+    ...(implementation_roadmap ? { implementation_roadmap } : {}),
+  };
+
+  return {
+    success: errors.length === 0,
+    spec,
+    errors,
+  };
+}
diff --git a/libs/spec-parser/src/xml-utils.ts b/libs/spec-parser/src/xml-utils.ts
new file mode 100644
index 00000000..acbb688c
--- /dev/null
+++ b/libs/spec-parser/src/xml-utils.ts
@@ -0,0 +1,79 @@
+/**
+ * XML utility functions for escaping, unescaping, and extracting XML content.
+ * These are pure functions with no dependencies for maximum reusability.
+ */
+
+/**
+ * Escape special XML characters.
+ * Handles undefined/null values by converting them to empty strings.
+ */
+export function escapeXml(str: string | undefined | null): string {
+  if (str == null) {
+    return '';
+  }
+  return str
+    .replace(/&/g, '&amp;')
+    .replace(/</g, '&lt;')
+    .replace(/>/g, '&gt;')
+    .replace(/"/g, '&quot;')
+    .replace(/'/g, '&apos;');
+}
+
+/**
+ * Unescape XML entities back to regular characters.
+ */
+export function unescapeXml(str: string): string {
+  return str
+    .replace(/&apos;/g, "'")
+    .replace(/&quot;/g, '"')
+    .replace(/&gt;/g, '>')
+    .replace(/&lt;/g, '<')
+    .replace(/&amp;/g, '&');
+}
+
+/**
+ * Escape special RegExp characters in a string.
+ */
+function escapeRegExp(value: string): string {
+  return value.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}
+
+/**
+ * Extract the content of a specific XML section.
+ *
+ * Note: This function only matches bare tags without attributes.
+ * Tags with attributes (e.g., `<tag id="1">`) are not supported.
+ *
+ * @param xmlContent - The full XML content
+ * @param tagName - The tag name to extract (e.g., 'implemented_features')
+ * @returns The content between the tags, or null if not found
+ */
+export function extractXmlSection(xmlContent: string, tagName: string): string | null {
+  const safeTag = escapeRegExp(tagName);
+  const regex = new RegExp(`<${safeTag}>([\\s\\S]*?)<\\/${safeTag}>`, 'i');
+  const match = xmlContent.match(regex);
+  return match ? match[1] : null;
+}
+
+/**
+ * Extract all values from repeated XML elements.
+ *
+ * Note: This function only matches bare tags without attributes.
+ * Tags with attributes (e.g., `<tag id="1">`) are not supported.
+ *
+ * @param xmlContent - The XML content to search
+ * @param tagName - The tag name to extract values from
+ * @returns Array of extracted values (unescaped and trimmed)
+ */
+export function extractXmlElements(xmlContent: string, tagName: string): string[] {
+  const values: string[] = [];
+  const safeTag = escapeRegExp(tagName);
+  const regex = new RegExp(`<${safeTag}>([\\s\\S]*?)<\\/${safeTag}>`, 'g');
+  const matches = xmlContent.matchAll(regex);
+
+  for (const match of matches) {
+    values.push(unescapeXml(match[1].trim()));
+  }
+
+  return values;
+}
diff --git a/libs/spec-parser/tsconfig.json b/libs/spec-parser/tsconfig.json
new file mode 100644
index 00000000..f677f8d5
--- /dev/null
+++ b/libs/spec-parser/tsconfig.json
@@ -0,0 +1,9 @@
+{
+  "extends": "../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "./dist",
+    "rootDir": "./src"
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "dist"]
+}
diff --git a/package-lock.json b/package-lock.json
index 97a2c4fe..32f39ec0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -88,6 +88,7 @@
       "license": "SEE LICENSE IN LICENSE",
       "dependencies": {
         "@automaker/dependency-resolver": "1.0.0",
+        "@automaker/spec-parser": "1.0.0",
         "@automaker/types": "1.0.0",
         "@codemirror/lang-xml": "6.1.0",
         "@codemirror/language": "^6.12.1",
@@ -561,6 +562,33 @@
         "undici-types": "~6.21.0"
       }
     },
+    "libs/spec-parser": {
+      "name": "@automaker/spec-parser",
+      "version": "1.0.0",
+      "license": "SEE LICENSE IN LICENSE",
+      "dependencies": {
+        "@automaker/types": "1.0.0",
+        "fast-xml-parser": "^5.3.3"
+      },
+      "devDependencies": {
+        "@types/node": "22.19.3",
+        "typescript": "5.9.3",
+        "vitest": "4.0.16"
+      },
+      "engines": {
+        "node": ">=22.0.0 <23.0.0"
+      }
+    },
+    "libs/spec-parser/node_modules/@types/node": {
+      "version": "22.19.3",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-22.19.3.tgz",
+      "integrity": "sha512-1N9SBnWYOJTrNZCdh/yJE+t910Y128BoyY+zBLWhL3r0TYzlTmFdXrPwHL9DyFZmlEXNQQolTZh3KHV31QDhyA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "undici-types": "~6.21.0"
+      }
+    },
     "libs/types": {
       "name": "@automaker/types",
       "version": "1.0.0",
@@ -656,6 +684,10 @@
       "resolved": "apps/server",
       "link": true
     },
+    "node_modules/@automaker/spec-parser": {
+      "resolved": "libs/spec-parser",
+      "link": true
+    },
     "node_modules/@automaker/types": {
       "resolved": "libs/types",
       "link": true
@@ -9724,6 +9756,24 @@
       ],
       "license": "BSD-3-Clause"
     },
+    "node_modules/fast-xml-parser": {
+      "version": "5.3.3",
+      "resolved": "https://registry.npmjs.org/fast-xml-parser/-/fast-xml-parser-5.3.3.tgz",
+      "integrity": "sha512-2O3dkPAAC6JavuMm8+4+pgTk+5hoAs+CjZ+sWcQLkX9+/tHRuTkQh/Oaifr8qDmZ8iEHb771Ea6G8CdwkrgvYA==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/NaturalIntelligence"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "strnum": "^2.1.0"
+      },
+      "bin": {
+        "fxparser": "src/cli/cli.js"
+      }
+    },
     "node_modules/fd-slicer": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/fd-slicer/-/fd-slicer-1.1.0.tgz",
@@ -11275,7 +11325,6 @@
       "os": [
         "darwin"
       ],
-      "peer": true,
       "engines": {
         "node": ">= 12.0.0"
       },
@@ -11297,7 +11346,6 @@
       "os": [
         "darwin"
       ],
-      "peer": true,
       "engines": {
         "node": ">= 12.0.0"
       },
@@ -11341,7 +11389,6 @@
       "os": [
         "linux"
       ],
-      "peer": true,
       "engines": {
         "node": ">= 12.0.0"
       },
@@ -11363,7 +11410,6 @@
       "os": [
         "linux"
       ],
-      "peer": true,
       "engines": {
         "node": ">= 12.0.0"
       },
@@ -11385,7 +11431,6 @@
       "os": [
         "linux"
       ],
-      "peer": true,
       "engines": {
         "node": ">= 12.0.0"
       },
@@ -11407,7 +11452,6 @@
       "os": [
         "linux"
       ],
-      "peer": true,
       "engines": {
         "node": ">= 12.0.0"
       },
@@ -11429,7 +11473,6 @@
       "os": [
         "linux"
       ],
-      "peer": true,
       "engines": {
         "node": ">= 12.0.0"
       },
@@ -11451,7 +11494,6 @@
       "os": [
         "win32"
       ],
-      "peer": true,
       "engines": {
         "node": ">= 12.0.0"
       },
@@ -11473,7 +11515,6 @@
       "os": [
         "win32"
       ],
-      "peer": true,
       "engines": {
         "node": ">= 12.0.0"
       },
@@ -14888,6 +14929,18 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/strnum": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/strnum/-/strnum-2.1.2.tgz",
+      "integrity": "sha512-l63NF9y/cLROq/yqKXSLtcMeeyOfnSQlfMSlzFt/K73oIaD8DGaQWd7Z34X9GPiKqP5rbSh84Hl4bOlLcjiSrQ==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/NaturalIntelligence"
+        }
+      ],
+      "license": "MIT"
+    },
     "node_modules/style-mod": {
       "version": "4.1.3",
       "resolved": "https://registry.npmjs.org/style-mod/-/style-mod-4.1.3.tgz",
diff --git a/package.json b/package.json
index 1c884bc5..96c9bf1e 100644
--- a/package.json
+++ b/package.json
@@ -30,7 +30,7 @@
     "dev:docker:rebuild": "docker compose build --no-cache && docker compose up",
     "dev:full": "npm run build:packages && concurrently \"npm run _dev:server\" \"npm run _dev:web\"",
     "build": "npm run build:packages && npm run build --workspace=apps/ui",
-    "build:packages": "npm run build -w @automaker/types && npm run build -w @automaker/platform && npm run build -w @automaker/utils && npm run build -w @automaker/prompts -w @automaker/model-resolver -w @automaker/dependency-resolver && npm run build -w @automaker/git-utils",
+    "build:packages": "npm run build -w @automaker/types && npm run build -w @automaker/platform && npm run build -w @automaker/utils -w @automaker/spec-parser && npm run build -w @automaker/prompts -w @automaker/model-resolver -w @automaker/dependency-resolver && npm run build -w @automaker/git-utils",
     "build:server": "npm run build:packages && npm run build --workspace=apps/server",
     "build:electron": "npm run build:packages && npm run build:electron --workspace=apps/ui",
     "build:electron:dir": "npm run build:packages && npm run build:electron:dir --workspace=apps/ui",