diff --git a/Packages/EaselChat/Sources/EaselChat/EaselAgentInstructions.swift b/Packages/EaselChat/Sources/EaselChat/EaselAgentInstructions.swift
index d2907f8..53b9295 100644
--- a/Packages/EaselChat/Sources/EaselChat/EaselAgentInstructions.swift
+++ b/Packages/EaselChat/Sources/EaselChat/EaselAgentInstructions.swift
@@ -26,7 +26,7 @@ enum EaselAgentInstructions {
     - Do not open external browser apps or use shell commands such as `open`, `open -a`, `xdg-open`, or `start` to preview project UI.
     - Write or copy every generated project asset into the project's resources/ folder before referencing it from app UI.
     - Codebases listed in `resources/codebase-references/` are external user repositories attached as read-only reference context. You may inspect them, but never modify files there, create files there, delete files there, format files there, run package installs/builds/generators there, or run git commands that change their state. Make all implementation changes inside the current Easel project directory.
-    - When the project ships a design system, it is the source of truth. Before writing any UI, read its spec at `resources/design-system/DESIGN.md`, then build every screen or slide directly from that system: reuse its exact colors, typography, spacing, radii, effects, and component families instead of inventing an ad-hoc palette, type scale, or component style. If you need a token the system does not define, extend it consistently rather than departing from it.
+    - When the project ships a design system, it is the source of truth. Before writing any UI, read its spec at `resources/design-system/DESIGN.md`, then build every screen or slide directly from that system: reuse its exact colors, typography, spacing, radii, effects, and component families instead of inventing an ad-hoc palette, type scale, or component style. Reusable design-system assets are bundled under `resources/design-system/resources/`; inspect and reference them when they fit the prototype. If you need a token the system does not define, extend it consistently rather than departing from it.
     - For slide deck projects, \(SlideDeckContract.authoringSummary)
     - For slide deck creation, \(slideDeckCreationGuidance)
     """
@@ -267,7 +267,7 @@ enum EaselAgentInstructions {
     }
 
     if let designSystem, designSystem.kind == .custom {
-      lines.append("Active design system: \(designSystem.displayName). Its spec is in this project at resources/design-system/DESIGN.md. Read it before writing UI and build directly from its colors, typography, spacing, radii, effects, and component families — do not improvise a different palette or type scale when the design system already defines one.")
+      lines.append("Active design system: \(designSystem.displayName). Its spec is in this project at resources/design-system/DESIGN.md, with reusable assets under resources/design-system/resources/. Read the spec before writing UI, inspect those assets when relevant, and build directly from its colors, typography, spacing, radii, effects, and component families — do not improvise a different palette or type scale when the design system already defines one.")
     }
 
     if !resourcePaths.isEmpty {
diff --git a/Packages/EaselChat/Sources/EaselChat/Projects/EaselProjectManager.swift b/Packages/EaselChat/Sources/EaselChat/Projects/EaselProjectManager.swift
index fc93492..b427543 100644
--- a/Packages/EaselChat/Sources/EaselChat/Projects/EaselProjectManager.swift
+++ b/Packages/EaselChat/Sources/EaselChat/Projects/EaselProjectManager.swift
@@ -30,6 +30,11 @@ public actor LocalEaselProjectManager: EaselProjectManaging {
   private let encoder: JSONEncoder
   private let decoder: JSONDecoder
 
+  private static let skippedReusableResourceDirectoryNames: Set<String> = [
+    ".git", ".svn", ".build", "DerivedData", "node_modules",
+    ".next", ".nuxt", "dist", "build", "coverage", ".cache", ".easel",
+  ]
+
   public init(
     rootDirectory: URL? = nil,
     fileManager: FileManager = .default
@@ -185,33 +190,48 @@ public actor LocalEaselProjectManager: EaselProjectManaging {
       )
     }
 
-    writeDesignSystemBrief(for: project, at: directoryURL)
+    writeDesignSystemBundle(for: project, at: directoryURL)
   }
 
-  /// Provides the custom design system's spec to the project so the agent can
-  /// reuse its tokens/components. Prefers the canonical, spec-compliant
-  /// `DESIGN.md` authored by the design system; falls back to a derived brief
-  /// only for legacy systems that predate it.
-  private func writeDesignSystemBrief(for project: EaselDesignProject, at directoryURL: URL) {
+  /// Provides the custom design system's spec and reusable assets to the
+  /// project. The bundle is copied into project-local resources so prototypes
+  /// can reference it without depending on the design-system source folder.
+  private func writeDesignSystemBundle(for project: EaselDesignProject, at directoryURL: URL) {
     let choice = project.designSystem
     guard choice.kind == .custom, let designSystemDirectory = choice.workingDirectory else {
       return
     }
 
-    let briefDirectory = directoryURL
+    let designSystemURL = URL(fileURLWithPath: designSystemDirectory, isDirectory: true)
+    let bundleDirectory = directoryURL
       .appendingPathComponent(ProjectResource.resourcesDirectoryName, isDirectory: true)
       .appendingPathComponent("design-system", isDirectory: true)
-    try? fileManager.createDirectory(at: briefDirectory, withIntermediateDirectories: true)
-    let destination = briefDirectory.appendingPathComponent("DESIGN.md")
+    try? fileManager.createDirectory(at: bundleDirectory, withIntermediateDirectories: true)
+
+    writeDesignSystemMarkdown(
+      from: designSystemURL,
+      choice: choice,
+      to: bundleDirectory
+    )
+    copyReusableDesignSystemResources(
+      from: designSystemURL,
+      into: bundleDirectory.appendingPathComponent("resources", isDirectory: true)
+    )
+  }
 
-    let canonicalURL = URL(fileURLWithPath: designSystemDirectory, isDirectory: true)
-      .appendingPathComponent("DESIGN.md")
+  private func writeDesignSystemMarkdown(
+    from designSystemURL: URL,
+    choice: EaselDesignSystemChoice,
+    to bundleDirectory: URL
+  ) {
+    let destination = bundleDirectory.appendingPathComponent("DESIGN.md")
+    let canonicalURL = designSystemURL.appendingPathComponent("DESIGN.md")
     if let canonical = try? Data(contentsOf: canonicalURL), !canonical.isEmpty {
       try? canonical.write(to: destination, options: .atomic)
       return
     }
 
-    let catalog = loadDesignSystemCatalog(atDesignSystemDirectory: designSystemDirectory)
+    let catalog = loadDesignSystemCatalog(atDesignSystemDirectory: designSystemURL.path)
     let markdown = DesignSystemBriefBuilder.markdown(
       displayName: choice.displayName,
       detail: choice.detail,
@@ -221,6 +241,84 @@ public actor LocalEaselProjectManager: EaselProjectManaging {
     try? Data(markdown.utf8).write(to: destination, options: .atomic)
   }
 
+  private func copyReusableDesignSystemResources(from designSystemURL: URL, into resourcesDirectory: URL) {
+    try? fileManager.createDirectory(at: resourcesDirectory, withIntermediateDirectories: true)
+
+    let groups: [(source: URL, destinationName: String)] = [
+      (
+        designSystemURL
+          .appendingPathComponent(".easel", isDirectory: true)
+          .appendingPathComponent("assets", isDirectory: true),
+        "figma-extracted"
+      ),
+      (
+        designSystemURL
+          .appendingPathComponent(ProjectResource.resourcesDirectoryName, isDirectory: true)
+          .appendingPathComponent("assets", isDirectory: true),
+        "imported-assets"
+      ),
+    ]
+
+    for group in groups {
+      let destination = resourcesDirectory.appendingPathComponent(group.destinationName, isDirectory: true)
+      try? copyReusableResourceFiles(from: group.source, to: destination)
+    }
+  }
+
+  private func copyReusableResourceFiles(from sourceDirectory: URL, to destinationDirectory: URL) throws {
+    var isDirectory: ObjCBool = false
+    guard fileManager.fileExists(atPath: sourceDirectory.path, isDirectory: &isDirectory),
+          isDirectory.boolValue else {
+      return
+    }
+
+    try fileManager.createDirectory(at: destinationDirectory, withIntermediateDirectories: true)
+    guard let enumerator = fileManager.enumerator(
+      at: sourceDirectory,
+      includingPropertiesForKeys: [.isDirectoryKey, .isRegularFileKey],
+      options: [.skipsHiddenFiles]
+    ) else {
+      return
+    }
+
+    while let itemURL = enumerator.nextObject() as? URL {
+      let values = try itemURL.resourceValues(forKeys: [.isDirectoryKey, .isRegularFileKey])
+      if values.isDirectory == true {
+        if Self.skippedReusableResourceDirectoryNames.contains(itemURL.lastPathComponent) {
+          enumerator.skipDescendants()
+        }
+        continue
+      }
+
+      guard values.isRegularFile == true,
+            let relativePath = relativePath(for: itemURL, relativeTo: sourceDirectory) else {
+        continue
+      }
+
+      let destinationURL = destinationDirectory.appendingPathComponent(relativePath)
+      try fileManager.createDirectory(
+        at: destinationURL.deletingLastPathComponent(),
+        withIntermediateDirectories: true
+      )
+      if fileManager.fileExists(atPath: destinationURL.path) {
+        try fileManager.removeItem(at: destinationURL)
+      }
+      try fileManager.copyItem(at: itemURL, to: destinationURL)
+    }
+  }
+
+  private func relativePath(for fileURL: URL, relativeTo rootURL: URL) -> String? {
+    let filePath = fileURL.standardizedFileURL.resolvingSymlinksInPath().path
+    let rootPath = rootURL.standardizedFileURL.resolvingSymlinksInPath().path
+    let rootPrefix = rootPath + "/"
+
+    guard filePath.hasPrefix(rootPrefix) else {
+      return nil
+    }
+
+    return String(filePath.dropFirst(rootPrefix.count))
+  }
+
   private func loadDesignSystemCatalog(atDesignSystemDirectory directory: String) -> EaselDesignSystemCatalog? {
     let catalogURL = URL(fileURLWithPath: directory, isDirectory: true)
       .appendingPathComponent(".easel", isDirectory: true)
@@ -325,7 +423,7 @@ public actor LocalEaselProjectManager: EaselProjectManaging {
     metadataLines.append("- Design system: \(project.designSystem.displayName)")
 
     let designSystemGuidance = project.designSystem.kind == .custom
-      ? "\nThis project uses the **\(project.designSystem.displayName)** design system. Follow `resources/design-system/DESIGN.md` for its colors, type, spacing, and component families, and reuse them throughout the UI.\n"
+      ? "\nThis project uses the **\(project.designSystem.displayName)** design system. Follow `resources/design-system/DESIGN.md` for its colors, type, spacing, and component families. Reusable design-system assets are bundled under `resources/design-system/resources/`.\n"
       : ""
 
     let slideDeckGuidance = project.kind == .slideDeck
diff --git a/Packages/EaselChat/Tests/EaselChatTests/EaselAgentInstructionsTests.swift b/Packages/EaselChat/Tests/EaselChatTests/EaselAgentInstructionsTests.swift
index c097bf1..6e42c74 100644
--- a/Packages/EaselChat/Tests/EaselChatTests/EaselAgentInstructionsTests.swift
+++ b/Packages/EaselChat/Tests/EaselChatTests/EaselAgentInstructionsTests.swift
@@ -24,6 +24,7 @@ struct EaselAgentInstructionsTests {
     #expect(prefix.contains("Easel"))
     // The agent must treat a bundled design system as the source of truth.
     #expect(prefix.contains("resources/design-system/DESIGN.md"))
+    #expect(prefix.contains("resources/design-system/resources/"))
     #expect(prefix.contains("source of truth"))
     #expect(prefix.contains("component families"))
     // Slide deck projects get presentation-design guidance in addition to the layout contract.
@@ -58,6 +59,7 @@ struct EaselAgentInstructionsTests {
 
     #expect(context.contains("Active design system: PlusPlus"))
     #expect(context.contains("resources/design-system/DESIGN.md"))
+    #expect(context.contains("resources/design-system/resources/"))
     #expect(context.contains("do not improvise a different palette"))
   }
 
diff --git a/Packages/EaselChat/Tests/EaselChatTests/EaselProjectManagerTests.swift b/Packages/EaselChat/Tests/EaselChatTests/EaselProjectManagerTests.swift
index 409ead5..851c792 100644
--- a/Packages/EaselChat/Tests/EaselChatTests/EaselProjectManagerTests.swift
+++ b/Packages/EaselChat/Tests/EaselChatTests/EaselProjectManagerTests.swift
@@ -295,10 +295,87 @@ struct EaselProjectManagerTests {
 
     let readme = try String(contentsOf: projectURL.appendingPathComponent("README.md"), encoding: .utf8)
     #expect(readme.contains("resources/design-system/DESIGN.md"))
+    #expect(readme.contains("resources/design-system/resources/"))
+  }
+
+  @Test
+  func createProjectCopiesCustomDesignSystemReusableAssetsIntoGroupedResources() async throws {
+    let rootDirectory = temporaryRoot()
+    let designSystemDirectory = temporaryRoot()
+    defer {
+      try? FileManager.default.removeItem(at: rootDirectory)
+      try? FileManager.default.removeItem(at: designSystemDirectory)
+    }
+
+    try write("# Plus UI Canonical\n\nUse the system.", to: designSystemDirectory.appendingPathComponent("DESIGN.md"))
+    try writeData(Data([1, 2, 3]), to: designSystemDirectory.appendingPathComponent(".easel/assets/thumbnail.png"))
+    try writeData(Data([4, 5, 6]), to: designSystemDirectory.appendingPathComponent(".easel/assets/images/logo.png"))
+    try writeData(Data([7, 8, 9]), to: designSystemDirectory.appendingPathComponent("resources/assets/fonts/Brand.woff2"))
+    try write("<svg></svg>", to: designSystemDirectory.appendingPathComponent("resources/assets/icons/logo.svg"))
+    try write("ignored dependency", to: designSystemDirectory.appendingPathComponent("resources/assets/node_modules/pkg/index.js"))
+    try writeData(Data([10, 11, 12]), to: designSystemDirectory.appendingPathComponent("resources/figma/System.fig"))
+    try write("struct Button {}", to: designSystemDirectory.appendingPathComponent("resources/code/Button.swift"))
+
+    let profile = EaselDesignSystemProfile(
+      id: UUID(),
+      name: "Plus UI",
+      blurb: "Plus UI kit",
+      notes: "",
+      sourceLinks: [],
+      workingDirectory: designSystemDirectory.path,
+      createdAt: Date(),
+      updatedAt: Date()
+    )
+
+    let manager = LocalEaselProjectManager(rootDirectory: rootDirectory)
+    let project = try await manager.createProject(from: EaselProjectCreateRequest(
+      name: "Asset Landing",
+      kind: .prototype,
+      designSystem: .custom(profile),
+      fidelity: .highFidelity
+    ))
+
+    let projectURL = URL(fileURLWithPath: project.workingDirectory)
+    let designMarkdownURL = projectURL.appendingPathComponent("resources/design-system/DESIGN.md")
+    let designMarkdown = try String(contentsOf: designMarkdownURL, encoding: .utf8)
+    #expect(designMarkdown.contains("# Plus UI Canonical"))
+
+    let copiedRoot = projectURL.appendingPathComponent("resources/design-system/resources", isDirectory: true)
+    #expect(FileManager.default.fileExists(atPath: copiedRoot.appendingPathComponent("figma-extracted/thumbnail.png").path))
+    #expect(FileManager.default.fileExists(atPath: copiedRoot.appendingPathComponent("figma-extracted/images/logo.png").path))
+    #expect(FileManager.default.fileExists(atPath: copiedRoot.appendingPathComponent("imported-assets/fonts/Brand.woff2").path))
+    #expect(FileManager.default.fileExists(atPath: copiedRoot.appendingPathComponent("imported-assets/icons/logo.svg").path))
+    #expect(FileManager.default.fileExists(atPath: copiedRoot.appendingPathComponent("imported-assets/node_modules/pkg/index.js").path) == false)
+    #expect(FileManager.default.fileExists(atPath: copiedRoot.appendingPathComponent("figma/System.fig").path) == false)
+    #expect(FileManager.default.fileExists(atPath: copiedRoot.appendingPathComponent("code/Button.swift").path) == false)
+
+    let resources = try await LocalProjectResourceManager().loadResources(forProjectAt: project.workingDirectory)
+    let resourcePaths = Set(resources.map(\.relativePath))
+    #expect(resourcePaths.contains("resources/design-system/DESIGN.md"))
+    #expect(resourcePaths.contains("resources/design-system/resources/figma-extracted/thumbnail.png"))
+    #expect(resourcePaths.contains("resources/design-system/resources/figma-extracted/images/logo.png"))
+    #expect(resourcePaths.contains("resources/design-system/resources/imported-assets/fonts/Brand.woff2"))
+    #expect(resourcePaths.contains("resources/design-system/resources/imported-assets/icons/logo.svg"))
   }
 
   private func temporaryRoot() -> URL {
     FileManager.default.temporaryDirectory
       .appendingPathComponent("EaselProjectManagerTests-\(UUID().uuidString)", isDirectory: true)
   }
+
+  private func write(_ string: String, to url: URL) throws {
+    try FileManager.default.createDirectory(
+      at: url.deletingLastPathComponent(),
+      withIntermediateDirectories: true
+    )
+    try Data(string.utf8).write(to: url)
+  }
+
+  private func writeData(_ data: Data, to url: URL) throws {
+    try FileManager.default.createDirectory(
+      at: url.deletingLastPathComponent(),
+      withIntermediateDirectories: true
+    )
+    try data.write(to: url)
+  }
 }