@@ -320,6 +320,11 @@ layer("GitLabCli.layer", (it) => {
       hosts: ["gitlab.selfhosted.test"],
       remotes: ["[email protected]:team/app.git"],
     },
+    {
+      case: "the checkout has a userless SCP gitlab.com remote",
+      hosts: ["gitlab.selfhosted.test"],
+      remotes: ["gitlab.com:team/app.git"],
+    },
   ])("leaves the host to glab when $case", ({ hosts, remotes }) =>
     Effect.gen(function* () {
       mockGlab(hosts, remotes);
 
@@ -422,6 +422,12 @@ function parseRepositoryPath(repository: string): {
   return { namespacePath, projectPath };
 }
 
+export function parseGitLabRemoteHost(remoteUrl: string) {
+  // Remote host parsing does not recognize userless SCP remotes.
+  const scpHost = /^([^@:/\\\s]{2,}):\/?[^/\s]+(?:\/[^/\s]+)+$/u.exec(remoteUrl.trim())?.[1];
+  return parseGitRemoteHost(scpHost ? `ssh://${scpHost}` : remoteUrl);
+}
+
 // glab prints a missing project or merge request as a bare 404.
 const classifyGlabFailure = (stderr: string): VcsProcessExitFailureKind | null => {
   const normalized = stderr.toLowerCase();
@@ -477,7 +483,7 @@ export const make = Effect.gen(function* () {
         Effect.orElseSucceed(() => []),
       );
       const followsRemote = remotes.some((remote) =>
-        knownHosts.has(parseGitRemoteHost(remote.url)?.host ?? ""),
+        knownHosts.has(parseGitLabRemoteHost(remote.url)?.host ?? ""),
       );
       return followsRemote ? undefined : { GITLAB_HOST: only.host };
     },
 
@@ -3,10 +3,7 @@ import * as Schema from "effect/Schema";
 import * as Effect from "effect/Effect";
 import * as Option from "effect/Option";
 import { SourceControlProviderError, type ChangeRequest } from "@t3tools/contracts";
-import {
-  parseGitRemoteHost,
-  unknownRemoteProvider as unknownHostProvider,
-} from "@t3tools/source-control-core/shared/definition";
+import { unknownRemoteProvider as unknownHostProvider } from "@t3tools/source-control-core/shared/definition";
 
 import * as GitLabCli from "./GitLabCli.ts";
 import * as GitLabChangeRequestTemplate from "./gitLabChangeRequestTemplate.ts";
@@ -110,9 +107,7 @@ function refineUnknownGitLabRemote(input: SourceControlUnknownRemoteRefinementIn
 
 /** The caller refines only an identity no host recognised, so its remote is on an unknown host. */
 function unknownRemoteProvider(remoteUrl: string) {
-  // Remote host parsing does not recognize userless SCP remotes.
-  const scpHost = /^([^@:/\\\s]{2,}):\/?[^/\s]+(?:\/[^/\s]+)+$/u.exec(remoteUrl.trim())?.[1];
-  const remote = parseGitRemoteHost(scpHost ? `ssh://${scpHost}` : remoteUrl);
+  const remote = GitLabCli.parseGitLabRemoteHost(remoteUrl);
   return remote === null ? null : unknownHostProvider(remote);
 }