Handle missing selected workspace files

src/server/workspaces/fileContentService.test.ts

@@ -42,6 +42,7 @@ describe("readWorkspaceFile", () => {
 
     await expect(readWorkspaceFile(root, undefined)).rejects.toThrow("path query parameter is required");
     await expect(readWorkspaceFile(root, "dir")).rejects.toThrow("Path is not a file");
+    await expect(readWorkspaceFile(root, "missing.txt")).rejects.toThrow("Path does not exist");
     await expect(readWorkspaceFile(root, "../secret.txt")).rejects.toThrow("Path traversal is not allowed");
     await expect(readWorkspaceFile(root, "/etc/passwd")).rejects.toThrow("Absolute paths are not allowed");
   });

src/server/workspaces/fileTreeService.test.ts

@@ -58,6 +58,7 @@ describe("listWorkspaceTree", () => {
     await writeFile(join(root, "file.txt"), "content");
 
     await expect(listWorkspaceTree(root, "file.txt")).rejects.toThrow("Path is not a directory");
+    await expect(listWorkspaceTree(root, "missing-dir")).rejects.toThrow("Path does not exist");
     await expect(listWorkspaceTree(root, "../outside")).rejects.toThrow("Path traversal is not allowed");
     await expect(listWorkspaceTree(root, "/tmp")).rejects.toThrow("Absolute paths are not allowed");
   });

src/server/workspaces/pathSafety.ts

@@ -5,7 +5,10 @@ export async function resolveInsideWorkspace(rootPath: string, relativePath: str
   const requested = normalizeRelativePath(relativePath);
   const root = await realpath(rootPath);
   const joined = join(root, requested);
-  const target = await realpath(joined);
+  const target = await realpath(joined).catch((error: unknown) => {
+    if (isNodeErrorWithCode(error, "ENOENT")) throw new Error("Path does not exist");
+    throw error;
+  });
   ensureInside(root, target);
   return { root, target, relativePath: requested };
 }
@@ -27,6 +30,10 @@ export function normalizeRelativePath(input: string | undefined): string {
   return parts.join("/");
 }
 
+function isNodeErrorWithCode(error: unknown, code: string): error is NodeJS.ErrnoException {
+  return typeof error === "object" && error !== null && "code" in error && error.code === code;
+}
+
 function ensureInside(root: string, target: string): void {
   const rel = relative(root, target);
   if (rel === "") return;