fix(client): reject incomplete GitHub owner paths before lookup

apps/mobile/src/features/projects/AddProjectScreen.tsx

@@ -23,6 +23,7 @@ import {
   getNewProjectPublishTarget,
   getNewProjectPublishTargets,
   getNewProjectRepository,
+  githubIncompleteOwnerRepositoryMessage,
   defaultHostCloneUrl,
   normalizePastedCloneUrl,
   parseAddProjectRemoteSource,
@@ -823,6 +824,11 @@ export function AddProjectRepositoryScreen(props: {
 
   const lookupRepository = async () => {
     if (!environment || repositoryInput.trim().length === 0 || isSubmitting) return;
+    const incompleteOwnerMessage = githubIncompleteOwnerRepositoryMessage(source, repositoryInput);
+    if (incompleteOwnerMessage) {
+      setError(incompleteOwnerMessage);
+      return;
+    }
     setError(null);
     setIsSubmitting(true);
     const provider = addProjectRemoteSourceProvider(source);

apps/web/src/components/CommandPalette.tsx

@@ -16,6 +16,7 @@ import {
   getNewProjectPublishTarget,
   getNewProjectPublishTargets,
   getNewProjectRepository,
+  githubIncompleteOwnerRepositoryMessage,
   normalizePastedCloneUrl,
   addProjectRemoteSourceLabel,
   addProjectRemoteSourcePathHint,
@@ -1939,6 +1940,21 @@ function OpenCommandPaletteDialog(props: {
         return;
       }
 
+      const incompleteOwnerMessage = githubIncompleteOwnerRepositoryMessage(
+        addProjectCloneFlow.source,
+        rawRepository,
+      );
+      if (incompleteOwnerMessage) {
+        toastManager.add(
+          stackedThreadToast({
+            type: "error",
+            title: "Repository name incomplete",
+            description: incompleteOwnerMessage,
+          }),
+        );
+        return;
+      }
+
       const provider = addProjectRemoteSourceProvider(addProjectCloneFlow.source);
       if (!provider) {
         const destinationPath = getCloneDestinationPath(

packages/client-runtime/src/operations/projects.test.ts

@@ -6,11 +6,42 @@ import {
   findExistingAddProject,
   getCloneDirectoryName,
   getDefaultCloneUrl,
+  githubIncompleteOwnerRepositoryMessage,
   normalizePastedCloneUrl,
 } from "./projects.ts";
 import type { EnvironmentProject } from "../state/models.ts";
 
 describe("add project shared logic", () => {
+  it("asks for a repository name when GitHub input is only an owner path", () => {
+    const github = SourceControlProviderKind.make("github");
+    expect(githubIncompleteOwnerRepositoryMessage(github, "pingdotgg/")).toBe(
+      "Enter the full owner/repository name.",
+    );
+    expect(githubIncompleteOwnerRepositoryMessage(github, "  pingdotgg//  ")).toBe(
+      "Enter the full owner/repository name.",
+    );
+    expect(githubIncompleteOwnerRepositoryMessage(github, "mona-cat_octo/")).toBe(
+      "Enter the full owner/repository name.",
+    );
+
+    for (const input of [
+      "pingdotgg/t3code",
+      "mona-cat_octo/repo",
+      "pingdotgg",
+      "https://github.com/pingdotgg/t3code.git",
+      "git@github.com:pingdotgg/t3code.git",
+    ]) {
+      expect(githubIncompleteOwnerRepositoryMessage(github, input)).toBeNull();
+    }
+    expect(
+      githubIncompleteOwnerRepositoryMessage(SourceControlProviderKind.make("gitlab"), "group/"),
+    ).toBeNull();
+    expect(githubIncompleteOwnerRepositoryMessage("url", "owner/")).toBeNull();
+    expect(
+      githubIncompleteOwnerRepositoryMessage(SourceControlProviderKind.make("forgejo"), "owner/"),
+    ).toBeNull();
+  });
+
   it("routes owner/repository shorthand to GitHub over HTTPS", () => {
     expect(normalizePastedCloneUrl("imputnet/helium")).toBe(
       "https://github.com/imputnet/helium.git",

packages/client-runtime/src/operations/projects.ts

@@ -106,6 +106,25 @@ export function defaultHostCloneUrl(repository: string): string | null {
     : `git@${definition.publicHost}:${path}`;
 }
 
+/** Owner present, repository name missing: `owner/` or `owner//`. */
+const INCOMPLETE_GITHUB_OWNER_PATH = /^[A-Za-z0-9](?:[A-Za-z0-9_-]{0,38})\/+$/;
+
+const INCOMPLETE_GITHUB_OWNER_REPOSITORY_MESSAGE = "Enter the full owner/repository name.";
+
+/**
+ * Message to show when a GitHub add-project field is only `owner/`.
+ * Lookup would send that to GitHub and come back as a generic failure.
+ * Returns null for complete names, bare repo names, URLs, and other sources.
+ */
+export function githubIncompleteOwnerRepositoryMessage(
+  source: AddProjectRemoteSource,
+  input: string,
+): string | null {
+  if (source !== "github") return null;
+  if (!INCOMPLETE_GITHUB_OWNER_PATH.test(input.trim())) return null;
+  return INCOMPLETE_GITHUB_OWNER_REPOSITORY_MESSAGE;
+}
+
 export function normalizePastedCloneUrl(input: string): string {
   const trimmed = input.trim();
   return REPOSITORY_SHORTHAND.test(trimmed) ? (defaultHostCloneUrl(trimmed) ?? trimmed) : trimmed;