diff --git a/apps/ui/src/components/views/board-view/dialogs/add-feature-dialog.tsx b/apps/ui/src/components/views/board-view/dialogs/add-feature-dialog.tsx
index 88a24316..86f45505 100644
--- a/apps/ui/src/components/views/board-view/dialogs/add-feature-dialog.tsx
+++ b/apps/ui/src/components/views/board-view/dialogs/add-feature-dialog.tsx
@@ -52,8 +52,8 @@ import { useNavigate } from '@tanstack/react-router';
 import {
   getAncestors,
   formatAncestorContextForPrompt,
-  AncestorContext,
-} from '@/components/views/graph-view/utils';
+  type AncestorContext,
+} from '@automaker/dependency-resolver';
 
 interface AddFeatureDialogProps {
   open: boolean;
diff --git a/apps/ui/src/components/views/board-view/shared/ancestor-context-section.tsx b/apps/ui/src/components/views/board-view/shared/ancestor-context-section.tsx
index 8d78fa43..bbdeebda 100644
--- a/apps/ui/src/components/views/board-view/shared/ancestor-context-section.tsx
+++ b/apps/ui/src/components/views/board-view/shared/ancestor-context-section.tsx
@@ -4,7 +4,7 @@ import { Label } from '@/components/ui/label';
 import { Button } from '@/components/ui/button';
 import { ChevronDown, ChevronRight, Users } from 'lucide-react';
 import { cn } from '@/lib/utils';
-import { AncestorContext } from '@/components/views/graph-view/utils';
+import type { AncestorContext } from '@automaker/dependency-resolver';
 import { Collapsible, CollapsibleContent, CollapsibleTrigger } from '@/components/ui/collapsible';
 
 interface ParentFeatureContext {
diff --git a/apps/ui/src/components/views/graph-view/graph-view.tsx b/apps/ui/src/components/views/graph-view/graph-view.tsx
index 33874dc9..7435348f 100644
--- a/apps/ui/src/components/views/graph-view/graph-view.tsx
+++ b/apps/ui/src/components/views/graph-view/graph-view.tsx
@@ -3,7 +3,7 @@ import { Feature, useAppStore } from '@/store/app-store';
 import { GraphCanvas } from './graph-canvas';
 import { useBoardBackground } from '../board-view/hooks';
 import { NodeActionCallbacks } from './hooks';
-import { wouldCreateCircularDependency, dependencyExists } from './utils';
+import { wouldCreateCircularDependency, dependencyExists } from '@automaker/dependency-resolver';
 import { toast } from 'sonner';
 
 interface GraphViewProps {
diff --git a/apps/ui/src/components/views/graph-view/utils/ancestor-context.ts b/apps/ui/src/components/views/graph-view/utils/ancestor-context.ts
deleted file mode 100644
index d0f2abaf..00000000
--- a/apps/ui/src/components/views/graph-view/utils/ancestor-context.ts
+++ /dev/null
@@ -1,93 +0,0 @@
-import { Feature } from '@/store/app-store';
-
-export interface AncestorContext {
-  id: string;
-  title?: string;
-  description: string;
-  spec?: string;
-  summary?: string;
-  depth: number; // 0 = immediate parent, 1 = grandparent, etc.
-}
-
-/**
- * Traverses the dependency graph to find all ancestors of a feature.
- * Returns ancestors ordered by depth (closest first).
- *
- * @param feature - The feature to find ancestors for
- * @param allFeatures - All features in the system
- * @param maxDepth - Maximum depth to traverse (prevents infinite loops)
- * @returns Array of ancestor contexts, sorted by depth (closest first)
- */
-export function getAncestors(
-  feature: Feature,
-  allFeatures: Feature[],
-  maxDepth: number = 10
-): AncestorContext[] {
-  const featureMap = new Map(allFeatures.map((f) => [f.id, f]));
-  const ancestors: AncestorContext[] = [];
-  const visited = new Set<string>();
-
-  function traverse(featureId: string, depth: number) {
-    if (depth > maxDepth || visited.has(featureId)) return;
-    visited.add(featureId);
-
-    const f = featureMap.get(featureId);
-    if (!f?.dependencies) return;
-
-    for (const depId of f.dependencies) {
-      const dep = featureMap.get(depId);
-      if (dep && !visited.has(depId)) {
-        ancestors.push({
-          id: dep.id,
-          title: dep.title,
-          description: dep.description,
-          spec: dep.spec,
-          summary: dep.summary,
-          depth,
-        });
-        traverse(depId, depth + 1);
-      }
-    }
-  }
-
-  traverse(feature.id, 0);
-
-  // Sort by depth (closest ancestors first)
-  return ancestors.sort((a, b) => a.depth - b.depth);
-}
-
-/**
- * Formats ancestor context for inclusion in a task description.
- *
- * @param ancestors - Array of ancestor contexts (including parent)
- * @param selectedIds - Set of selected ancestor IDs to include
- * @returns Formatted markdown string with ancestor context
- */
-export function formatAncestorContextForPrompt(
-  ancestors: AncestorContext[],
-  selectedIds: Set<string>
-): string {
-  const selectedAncestors = ancestors.filter((a) => selectedIds.has(a.id));
-  if (selectedAncestors.length === 0) return '';
-
-  const sections = selectedAncestors.map((ancestor) => {
-    const parts: string[] = [];
-    const title = ancestor.title || `Task (${ancestor.id.slice(0, 8)})`;
-
-    parts.push(`### ${title}`);
-
-    if (ancestor.description) {
-      parts.push(`**Description:** ${ancestor.description}`);
-    }
-    if (ancestor.spec) {
-      parts.push(`**Specification:**\n${ancestor.spec}`);
-    }
-    if (ancestor.summary) {
-      parts.push(`**Summary:** ${ancestor.summary}`);
-    }
-
-    return parts.join('\n\n');
-  });
-
-  return `## Ancestor Context\n\n${sections.join('\n\n---\n\n')}`;
-}
diff --git a/apps/ui/src/components/views/graph-view/utils/dependency-validation.ts b/apps/ui/src/components/views/graph-view/utils/dependency-validation.ts
deleted file mode 100644
index e3da76f8..00000000
--- a/apps/ui/src/components/views/graph-view/utils/dependency-validation.ts
+++ /dev/null
@@ -1,51 +0,0 @@
-import { Feature } from '@/store/app-store';
-
-/**
- * Checks if adding a dependency from sourceId to targetId would create a circular dependency.
- * Uses DFS to detect if targetId can reach sourceId through existing dependencies.
- *
- * @param features - All features in the system
- * @param sourceId - The feature that would become a dependency (the prerequisite)
- * @param targetId - The feature that would depend on sourceId
- * @returns true if adding this dependency would create a cycle
- */
-export function wouldCreateCircularDependency(
-  features: Feature[],
-  sourceId: string,
-  targetId: string
-): boolean {
-  const featureMap = new Map(features.map((f) => [f.id, f]));
-  const visited = new Set<string>();
-
-  function canReach(currentId: string, targetId: string): boolean {
-    if (currentId === targetId) return true;
-    if (visited.has(currentId)) return false;
-
-    visited.add(currentId);
-    const feature = featureMap.get(currentId);
-    if (!feature?.dependencies) return false;
-
-    for (const depId of feature.dependencies) {
-      if (canReach(depId, targetId)) return true;
-    }
-    return false;
-  }
-
-  // Check if source can reach target through existing dependencies
-  // If so, adding target -> source would create a cycle
-  return canReach(sourceId, targetId);
-}
-
-/**
- * Checks if a dependency already exists between two features.
- *
- * @param features - All features in the system
- * @param sourceId - The potential dependency (prerequisite)
- * @param targetId - The feature that might depend on sourceId
- * @returns true if targetId already depends on sourceId
- */
-export function dependencyExists(features: Feature[], sourceId: string, targetId: string): boolean {
-  const targetFeature = features.find((f) => f.id === targetId);
-  if (!targetFeature?.dependencies) return false;
-  return targetFeature.dependencies.includes(sourceId);
-}
diff --git a/apps/ui/src/components/views/graph-view/utils/index.ts b/apps/ui/src/components/views/graph-view/utils/index.ts
deleted file mode 100644
index c3c1a6fd..00000000
--- a/apps/ui/src/components/views/graph-view/utils/index.ts
+++ /dev/null
@@ -1,2 +0,0 @@
-export * from './dependency-validation';
-export * from './ancestor-context';
diff --git a/libs/dependency-resolver/src/index.ts b/libs/dependency-resolver/src/index.ts
index 5f6d7259..9ecaa487 100644
--- a/libs/dependency-resolver/src/index.ts
+++ b/libs/dependency-resolver/src/index.ts
@@ -7,5 +7,10 @@ export {
   resolveDependencies,
   areDependenciesSatisfied,
   getBlockingDependencies,
+  wouldCreateCircularDependency,
+  dependencyExists,
+  getAncestors,
+  formatAncestorContextForPrompt,
   type DependencyResolutionResult,
+  type AncestorContext,
 } from './resolver.js';
diff --git a/libs/dependency-resolver/src/resolver.ts b/libs/dependency-resolver/src/resolver.ts
index ec7e8273..c63b1a1a 100644
--- a/libs/dependency-resolver/src/resolver.ts
+++ b/libs/dependency-resolver/src/resolver.ts
@@ -209,3 +209,148 @@ export function getBlockingDependencies(feature: Feature, allFeatures: Feature[]
     return dep && dep.status !== 'completed' && dep.status !== 'verified';
   });
 }
+
+/**
+ * Checks if adding a dependency from sourceId to targetId would create a circular dependency.
+ * Uses DFS to detect if targetId can reach sourceId through existing dependencies.
+ *
+ * @param features - All features in the system
+ * @param sourceId - The feature that would become a dependency (the prerequisite)
+ * @param targetId - The feature that would depend on sourceId
+ * @returns true if adding this dependency would create a cycle
+ */
+export function wouldCreateCircularDependency(
+  features: Feature[],
+  sourceId: string,
+  targetId: string
+): boolean {
+  const featureMap = new Map(features.map((f) => [f.id, f]));
+  const visited = new Set<string>();
+
+  function canReach(currentId: string, target: string): boolean {
+    if (currentId === target) return true;
+    if (visited.has(currentId)) return false;
+
+    visited.add(currentId);
+    const feature = featureMap.get(currentId);
+    if (!feature?.dependencies) return false;
+
+    for (const depId of feature.dependencies) {
+      if (canReach(depId, target)) return true;
+    }
+    return false;
+  }
+
+  // Check if source can reach target through existing dependencies
+  // If so, adding target -> source would create a cycle
+  return canReach(sourceId, targetId);
+}
+
+/**
+ * Checks if a dependency already exists between two features.
+ *
+ * @param features - All features in the system
+ * @param sourceId - The potential dependency (prerequisite)
+ * @param targetId - The feature that might depend on sourceId
+ * @returns true if targetId already depends on sourceId
+ */
+export function dependencyExists(features: Feature[], sourceId: string, targetId: string): boolean {
+  const targetFeature = features.find((f) => f.id === targetId);
+  if (!targetFeature?.dependencies) return false;
+  return targetFeature.dependencies.includes(sourceId);
+}
+
+/**
+ * Context information about an ancestor feature in the dependency graph.
+ */
+export interface AncestorContext {
+  id: string;
+  title?: string;
+  description: string;
+  spec?: string;
+  summary?: string;
+  depth: number; // 0 = immediate parent, 1 = grandparent, etc.
+}
+
+/**
+ * Traverses the dependency graph to find all ancestors of a feature.
+ * Returns ancestors ordered by depth (closest first).
+ *
+ * @param feature - The feature to find ancestors for
+ * @param allFeatures - All features in the system
+ * @param maxDepth - Maximum depth to traverse (prevents infinite loops)
+ * @returns Array of ancestor contexts, sorted by depth (closest first)
+ */
+export function getAncestors(
+  feature: Feature,
+  allFeatures: Feature[],
+  maxDepth: number = 10
+): AncestorContext[] {
+  const featureMap = new Map(allFeatures.map((f) => [f.id, f]));
+  const ancestors: AncestorContext[] = [];
+  const visited = new Set<string>();
+
+  function traverse(featureId: string, depth: number) {
+    if (depth > maxDepth || visited.has(featureId)) return;
+    visited.add(featureId);
+
+    const f = featureMap.get(featureId);
+    if (!f?.dependencies) return;
+
+    for (const depId of f.dependencies) {
+      const dep = featureMap.get(depId);
+      if (dep && !visited.has(depId)) {
+        ancestors.push({
+          id: dep.id,
+          title: dep.title,
+          description: dep.description,
+          spec: dep.spec,
+          summary: dep.summary,
+          depth,
+        });
+        traverse(depId, depth + 1);
+      }
+    }
+  }
+
+  traverse(feature.id, 0);
+
+  // Sort by depth (closest ancestors first)
+  return ancestors.sort((a, b) => a.depth - b.depth);
+}
+
+/**
+ * Formats ancestor context for inclusion in a task description.
+ *
+ * @param ancestors - Array of ancestor contexts (including parent)
+ * @param selectedIds - Set of selected ancestor IDs to include
+ * @returns Formatted markdown string with ancestor context
+ */
+export function formatAncestorContextForPrompt(
+  ancestors: AncestorContext[],
+  selectedIds: Set<string>
+): string {
+  const selectedAncestors = ancestors.filter((a) => selectedIds.has(a.id));
+  if (selectedAncestors.length === 0) return '';
+
+  const sections = selectedAncestors.map((ancestor) => {
+    const parts: string[] = [];
+    const title = ancestor.title || `Task (${ancestor.id.slice(0, 8)})`;
+
+    parts.push(`### ${title}`);
+
+    if (ancestor.description) {
+      parts.push(`**Description:** ${ancestor.description}`);
+    }
+    if (ancestor.spec) {
+      parts.push(`**Specification:**\n${ancestor.spec}`);
+    }
+    if (ancestor.summary) {
+      parts.push(`**Summary:** ${ancestor.summary}`);
+    }
+
+    return parts.join('\n\n');
+  });
+
+  return `## Ancestor Context\n\n${sections.join('\n\n---\n\n')}`;
+}