diff --git a/docs/integrations/gitlab.md b/docs/integrations/gitlab.md
index e2563437..58222a4f 100644
--- a/docs/integrations/gitlab.md
+++ b/docs/integrations/gitlab.md
@@ -11,9 +11,12 @@ from the swarm secret store itself.
 
 ## Linking an account
 
-The swarm UI has no GitLab dialog yet, so link an account with the controller's
-API. This is the same route family as the other
-[linked accounts](../swarm/ui.md#linking-external-accounts):
+In the swarm UI, open an agent, choose **link account**, then **gitlab
+account**. Fill in a label, the instance URL (it starts as `https://gitlab.com`)
+and the token. The form shows the recommended scopes and the controller's
+answer if it refuses the input. The linked account appears in the agent's list
+of [linked accounts](../swarm/ui.md#linking-external-accounts) with a delete
+action. The UI calls the controller's API, which you can also call directly:
 
 ```text
 PUT /api/hives/{hive}/agents/{agent}/gitlab-accounts/{label}
diff --git a/docs/swarm/ui.md b/docs/swarm/ui.md
index 1e3cce19..ada2ef6e 100644
--- a/docs/swarm/ui.md
+++ b/docs/swarm/ui.md
@@ -810,8 +810,7 @@ a link dialog closes.
   takes a delete, then a new link.
 - **link a gitlab account** — `PUT /api/hives/{hive}/agents/{agent}/gitlab-accounts/{label}`
   with a GitLab base URL and an access token, stored at
-  `swarm/agents/<agent>/gitlab/<label>`. The swarm UI has no dialog for it yet;
-  the API is the way to link one. What the token needs and how the agent uses
+  `swarm/agents/<agent>/gitlab/<label>`. Link it from the agent's **link account** menu. What the token needs and how the agent uses
   it: [GitLab accounts](../integrations/gitlab.md).
 - **link a github account** — `PUT /api/hives/{hive}/agents/{agent}/github-account`
   with a personal access token, stored at `swarm/agents/<agent>/github-token`.
diff --git a/frontend/packages/swarm-ui/src/agent/detail/LinkAccountMenu.tsx b/frontend/packages/swarm-ui/src/agent/detail/LinkAccountMenu.tsx
index 17bb78e9..63650672 100644
--- a/frontend/packages/swarm-ui/src/agent/detail/LinkAccountMenu.tsx
+++ b/frontend/packages/swarm-ui/src/agent/detail/LinkAccountMenu.tsx
@@ -8,11 +8,12 @@ import { Badge } from "@hive/shared/badge.js";
 import { Dropdown, type DropdownOption } from "@hive/shared/dropdown.js";
 import { LinkIcon } from "@hive/shared/icons.js";
 
-export type LinkKind = "matrix" | "forge" | "github" | "backend";
+export type LinkKind = "matrix" | "forge" | "gitlab" | "github" | "backend";
 
 const OPTIONS: DropdownOption[] = [
   { value: "matrix", label: "matrix account" },
   { value: "forge", label: "forge account" },
+  { value: "gitlab", label: "gitlab account" },
   { value: "github", label: "github account" },
   { value: "backend", label: "API-key environment" },
 ];
@@ -41,7 +42,7 @@ export function LinkAccountMenu({
         disabled={!hasHive}
         title={
           hasHive
-            ? `link a matrix, forge or github account, or set the API-key environment, for ${agent}`
+            ? `link a matrix, forge, gitlab or github account, or set the API-key environment, for ${agent}`
             : "no hive on record for this agent — nothing to link against"
         }
       />
diff --git a/frontend/packages/swarm-ui/src/agent/detail/LinkedAccounts.tsx b/frontend/packages/swarm-ui/src/agent/detail/LinkedAccounts.tsx
index 2ae5d702..6d627fee 100644
--- a/frontend/packages/swarm-ui/src/agent/detail/LinkedAccounts.tsx
+++ b/frontend/packages/swarm-ui/src/agent/detail/LinkedAccounts.tsx
@@ -16,6 +16,7 @@ import { Badge } from "@hive/shared/badge.js";
 import { CheckboxField } from "../../ui/checkbox-field/CheckboxField.js";
 import { ConfirmDialog } from "../../ui/confirm-dialog/ConfirmDialog.js";
 import { accountKindLabel } from "./account-kind.js";
+import { deleteUrl, listUrl } from "./account-api.js";
 import "./LinkedAccounts.css";
 
 type AccountKind = "matrix" | "forgejo" | "gitlab" | "github" | "backend";
@@ -28,23 +29,6 @@ interface LinkedAccount {
   reserved: boolean;
 }
 
-// The DELETE route for one account, beside the PUT that links it.
-function accountUrl(hive: string, agent: string, a: LinkedAccount): string {
-  const base = `/api/hives/${encodeURIComponent(hive)}/agents/${encodeURIComponent(agent)}`;
-  switch (a.kind) {
-    case "matrix":
-      return `${base}/matrix-accounts/${encodeURIComponent(a.name)}`;
-    case "forgejo":
-      return `${base}/forge-accounts/${encodeURIComponent(a.name)}`;
-    case "gitlab":
-      return `${base}/gitlab-accounts/${encodeURIComponent(a.name)}`;
-    case "github":
-      return `${base}/github-account`;
-    case "backend":
-      return `${base}/backend-env`;
-  }
-}
-
 export function LinkedAccounts({
   hive,
   agent,
@@ -68,9 +52,7 @@ export function LinkedAccounts({
   useEffect(() => {
     let cancelled = false;
     (async () => {
-      const r = await fetch(
-        `/api/hives/${encodeURIComponent(hive)}/agents/${encodeURIComponent(agent)}/linked-accounts`,
-      );
+      const r = await fetch(listUrl(hive, agent));
       if (!r.ok) {
         if (!cancelled) setError(await readApiError(r));
         return;
@@ -97,7 +79,7 @@ export function LinkedAccounts({
     if (!deleteTarget) return;
     setDeleting(true);
     try {
-      const url = accountUrl(hive, agent, deleteTarget);
+      const url = deleteUrl(hive, agent, deleteTarget);
       const r = await fetch(
         deleteTarget.kind === "matrix" && revoke ? `${url}?revoke=true` : url,
         { method: "DELETE" },
diff --git a/frontend/packages/swarm-ui/src/agent/detail/account-api.ts b/frontend/packages/swarm-ui/src/agent/detail/account-api.ts
new file mode 100644
index 00000000..8a4f4e93
--- /dev/null
+++ b/frontend/packages/swarm-ui/src/agent/detail/account-api.ts
@@ -0,0 +1,72 @@
+// The routes and request body behind linking, listing and deleting an
+// external forge account. Pure, so `npm test` runs them without a browser.
+
+/** The kinds that share the label + URL + token shape. */
+export type ForgeLinkKind = "forge" | "gitlab";
+
+/** `hive_types::Ident`, which the controller checks for the label. */
+export const LABEL_PATTERN = "[a-z0-9\\-]{1,63}";
+
+function agentBase(hive: string, agent: string): string {
+  return `/api/hives/${encodeURIComponent(hive)}/agents/${encodeURIComponent(agent)}`;
+}
+
+/** PUT target for linking `label` under `kind`. */
+export function linkUrl(
+  hive: string,
+  agent: string,
+  kind: ForgeLinkKind,
+  label: string,
+): string {
+  const route = kind === "gitlab" ? "gitlab-accounts" : "forge-accounts";
+  return `${agentBase(hive, agent)}/${route}/${encodeURIComponent(label)}`;
+}
+
+/** The PUT body; the token is sent as typed, the URL trimmed. */
+export function linkBody(url: string, token: string): string {
+  return JSON.stringify({ url: url.trim(), token });
+}
+
+/** GET target for the agent's linked accounts. */
+export function listUrl(hive: string, agent: string): string {
+  return `${agentBase(hive, agent)}/linked-accounts`;
+}
+
+/** DELETE target for one linked account, as listed by `listUrl`. */
+export function deleteUrl(
+  hive: string,
+  agent: string,
+  a: { kind: string; name: string },
+): string {
+  const base = agentBase(hive, agent);
+  const name = encodeURIComponent(a.name);
+  switch (a.kind) {
+    case "matrix":
+      return `${base}/matrix-accounts/${name}`;
+    case "forgejo":
+      return `${base}/forge-accounts/${name}`;
+    case "gitlab":
+      return `${base}/gitlab-accounts/${name}`;
+    case "github":
+      return `${base}/github-account`;
+    default:
+      return `${base}/backend-env`;
+  }
+}
+
+/** A message for input the controller would refuse anyway, or null. The
+ * controller's own URL rule stays the gate and its 400 is shown as is. */
+export function checkLink(
+  label: string,
+  url: string,
+  token: string,
+): string | null {
+  if (!new RegExp(`^${LABEL_PATTERN}$`).test(label)) {
+    return "label: 1-63 chars, lowercase letters, digits, hyphen";
+  }
+  if (!/^https?:\/\/\S+$/.test(url.trim())) {
+    return "URL must start with http:// or https://";
+  }
+  if (token === "") return "token is required";
+  return null;
+}
diff --git a/frontend/packages/swarm-ui/src/agent/roster/AgentActions.tsx b/frontend/packages/swarm-ui/src/agent/roster/AgentActions.tsx
index f56abea7..6983be16 100644
--- a/frontend/packages/swarm-ui/src/agent/roster/AgentActions.tsx
+++ b/frontend/packages/swarm-ui/src/agent/roster/AgentActions.tsx
@@ -98,6 +98,7 @@ export function useAgentActions(
   const [customTarget, setCustomTarget] = useState<AgentRow | null>(null);
   const [matrixTarget, setMatrixTarget] = useState<AgentRow | null>(null);
   const [forgeTarget, setForgeTarget] = useState<AgentRow | null>(null);
+  const [gitlabTarget, setGitlabTarget] = useState<AgentRow | null>(null);
   const [githubTarget, setGithubTarget] = useState<AgentRow | null>(null);
   const [backendTarget, setBackendTarget] = useState<AgentRow | null>(null);
   const [linkVersion, setLinkVersion] = useState(0);
@@ -111,6 +112,10 @@ export function useAgentActions(
     setForgeTarget(null);
     linkClosed();
   };
+  const closeGitlab = () => {
+    setGitlabTarget(null);
+    linkClosed();
+  };
   const closeGithub = () => {
     setGithubTarget(null);
     linkClosed();
@@ -233,12 +238,28 @@ export function useAgentActions(
       >
         {forgeTarget?.hive ? (
           <LinkForgeAccountForm
+            kind="forge"
             hive={forgeTarget.hive}
             agent={forgeTarget.name}
             onClose={closeForge}
           />
         ) : null}
       </Dialog>
+      <Dialog
+        open={gitlabTarget !== null}
+        onClose={closeGitlab}
+        label="link a gitlab account"
+        plain
+      >
+        {gitlabTarget?.hive ? (
+          <LinkForgeAccountForm
+            kind="gitlab"
+            hive={gitlabTarget.hive}
+            agent={gitlabTarget.name}
+            onClose={closeGitlab}
+          />
+        ) : null}
+      </Dialog>
       <Dialog
         open={githubTarget !== null}
         onClose={closeGithub}
@@ -330,6 +351,7 @@ export function useAgentActions(
     openLink: (row, kind) => {
       if (kind === "matrix") setMatrixTarget(row);
       else if (kind === "forge") setForgeTarget(row);
+      else if (kind === "gitlab") setGitlabTarget(row);
       else if (kind === "github") setGithubTarget(row);
       else setBackendTarget(row);
     },
diff --git a/frontend/packages/swarm-ui/src/pages/LinkForgeAccountForm.tsx b/frontend/packages/swarm-ui/src/pages/LinkForgeAccountForm.tsx
index 2389e92f..94eab3ca 100644
--- a/frontend/packages/swarm-ui/src/pages/LinkForgeAccountForm.tsx
+++ b/frontend/packages/swarm-ui/src/pages/LinkForgeAccountForm.tsx
@@ -1,10 +1,11 @@
 // <LinkForgeAccountForm> — writes an external forge account (base URL +
-// token) for one agent into the swarm secret store.
-// PUTs `/api/hives/{hive}/agents/{agent}/forge-accounts/{label}` — 200
+// token) for one agent into the swarm secret store. `kind` picks the
+// route and the wording: "forge" (Forgejo) or "gitlab".
+// PUTs `/api/hives/{hive}/agents/{agent}/{forge,gitlab}-accounts/{label}` — 200
 // (`{ url }`) on success, 400/409/500 as `problem+json`, shown via
 // `ApiErrorPanel` like `LinkMatrixAccountForm`.
 //
-// The label is what the agent passes to `hive-forge -f <label>`. A blind
+// A forge label is what the agent passes to `hive-forge -f <label>`. A blind
 // set: no route hands a token back. Linked labels and URLs show on
 // the agent panel (`LinkedAccounts`).
 import { useState } from "preact/hooks";
@@ -13,11 +14,17 @@ import { readApiError, type ProblemDetails } from "@hive/shared/api-error.js";
 import { Panel } from "../ui/panel/Panel.js";
 import { TextField } from "../ui/text-field/TextField.js";
 import { Button } from "../ui/button/Button.js";
+import {
+  checkLink,
+  LABEL_PATTERN,
+  linkBody,
+  linkUrl,
+  type ForgeLinkKind,
+} from "../agent/detail/account-api.js";
 import "./LinkMatrixAccountForm.css";
 
-// `hive_types::Ident`, which the server checks: `hive-forge -f` accepts
-// nothing wider. A UX hint only; the server is the gate.
-const LABEL_PATTERN = "[a-z0-9\\-]{1,63}";
+// Prefilled for gitlab; the field stays editable for a self-hosted instance.
+const GITLAB_DEFAULT_URL = "https://gitlab.com";
 
 type SubmitState =
   | { status: "idle" }
@@ -26,31 +33,35 @@ type SubmitState =
   | { status: "error"; problem: ProblemDetails };
 
 export function LinkForgeAccountForm({
+  kind,
   hive,
   agent,
   onClose,
 }: {
+  kind: ForgeLinkKind;
   hive: string;
   agent: string;
   onClose?: () => void;
 }) {
   const [label, setLabel] = useState("");
-  const [url, setUrl] = useState("");
+  const [url, setUrl] = useState(kind === "gitlab" ? GITLAB_DEFAULT_URL : "");
   const [token, setToken] = useState("");
   const [result, setResult] = useState<SubmitState>({ status: "idle" });
 
   async function submit(e: Event) {
     e.preventDefault();
+    const invalid = checkLink(label, url, token);
+    if (invalid) {
+      setResult({ status: "error", problem: { detail: invalid } });
+      return;
+    }
     setResult({ status: "submitting" });
     try {
-      const r = await fetch(
-        `/api/hives/${encodeURIComponent(hive)}/agents/${encodeURIComponent(agent)}/forge-accounts/${encodeURIComponent(label)}`,
-        {
-          method: "PUT",
-          headers: { "content-type": "application/json" },
-          body: JSON.stringify({ url: url.trim(), token }),
-        },
-      );
+      const r = await fetch(linkUrl(hive, agent, kind, label), {
+        method: "PUT",
+        headers: { "content-type": "application/json" },
+        body: linkBody(url, token),
+      });
       if (!r.ok) {
         setResult({ status: "error", problem: await readApiError(r) });
         return;
@@ -68,38 +79,59 @@ export function LinkForgeAccountForm({
 
   return (
     <Panel
-      title={`link a forge account — ${agent}`}
+      title={`link a ${kind === "gitlab" ? "gitlab" : "forge"} account — ${agent}`}
       icon="🔗"
       onClose={onClose}
     >
-      <p>
-        Writes the account to the swarm secret store. The agent fetches it
-        within two minutes and can then use{" "}
-        <code>hive-forge -f {label || "<label>"}</code>. Create the token on the
-        external forge first; nothing is created there.
-      </p>
+      {kind === "gitlab" ? (
+        <>
+          <p>
+            Writes the account to the swarm secret store. The agent fetches it
+            within two minutes and can then use <code>glab</code> and{" "}
+            <code>git push</code> against the instance. Create the token on
+            GitLab first; nothing is created there.
+          </p>
+          <p>
+            Scope the token <code>api</code> and <code>write_repository</code>:
+            the first is for <code>glab</code>, the second for pushing over
+            HTTPS. Use a dedicated bot account; the agent can act within the
+            token's scopes.
+          </p>
+        </>
+      ) : (
+        <p>
+          Writes the account to the swarm secret store. The agent fetches it
+          within two minutes and can then use{" "}
+          <code>hive-forge -f {label || "<label>"}</code>. Create the token on
+          the external forge first; nothing is created there.
+        </p>
+      )}
       <form class="link-matrix-account-form" onSubmit={submit}>
         <TextField
-          id="forge-account-label"
+          id={`${kind}-account-label`}
           label="label"
           value={label}
           pattern={LABEL_PATTERN}
           title="1-63 chars: lowercase letters, digits, hyphen"
-          placeholder="e.g. myforge"
+          placeholder={kind === "gitlab" ? "e.g. gitlab-com" : "e.g. myforge"}
           required
           onInput={setLabel}
         />
         <TextField
-          id="forge-account-url"
-          label="forge URL"
+          id={`${kind}-account-url`}
+          label={kind === "gitlab" ? "instance URL" : "forge URL"}
           type="url"
           value={url}
-          placeholder="https://forge.example.org"
+          placeholder={
+            kind === "gitlab"
+              ? "https://gitlab.example.org"
+              : "https://forge.example.org"
+          }
           required
           onInput={setUrl}
         />
         <TextField
-          id="forge-account-token"
+          id={`${kind}-account-token`}
           label="access token"
           type="password"
           value={token}
diff --git a/frontend/packages/swarm-ui/test/account-api.test.mjs b/frontend/packages/swarm-ui/test/account-api.test.mjs
new file mode 100644
index 00000000..a1622b3d
--- /dev/null
+++ b/frontend/packages/swarm-ui/test/account-api.test.mjs
@@ -0,0 +1,73 @@
+// The link / list / delete requests for forge and gitlab accounts, and the
+// client-side check before a link is sent. Run by `npm test` with Node's
+// type stripping.
+import assert from "node:assert/strict";
+import { test } from "node:test";
+import {
+  checkLink,
+  deleteUrl,
+  linkBody,
+  linkUrl,
+  listUrl,
+} from "../src/agent/detail/account-api.ts";
+
+test("a gitlab link PUTs to gitlab-accounts, a forge link to forge-accounts", () => {
+  assert.equal(
+    linkUrl("h1", "atlas", "gitlab", "gitlab-com"),
+    "/api/hives/h1/agents/atlas/gitlab-accounts/gitlab-com",
+  );
+  assert.equal(
+    linkUrl("h1", "atlas", "forge", "myforge"),
+    "/api/hives/h1/agents/atlas/forge-accounts/myforge",
+  );
+});
+
+test("path segments are encoded", () => {
+  assert.equal(
+    linkUrl("a/b", "x y", "gitlab", "l?"),
+    "/api/hives/a%2Fb/agents/x%20y/gitlab-accounts/l%3F",
+  );
+});
+
+test("the body carries the trimmed url and the token untouched", () => {
+  assert.deepEqual(JSON.parse(linkBody("  https://gitlab.com ", " tok en ")), {
+    url: "https://gitlab.com",
+    token: " tok en ",
+  });
+});
+
+test("list and delete hit the linked-accounts and gitlab routes", () => {
+  assert.equal(
+    listUrl("h1", "atlas"),
+    "/api/hives/h1/agents/atlas/linked-accounts",
+  );
+  assert.equal(
+    deleteUrl("h1", "atlas", { kind: "gitlab", name: "gitlab-com" }),
+    "/api/hives/h1/agents/atlas/gitlab-accounts/gitlab-com",
+  );
+  // Control: the other kinds keep their routes.
+  assert.equal(
+    deleteUrl("h1", "atlas", { kind: "forgejo", name: "f" }),
+    "/api/hives/h1/agents/atlas/forge-accounts/f",
+  );
+  assert.equal(
+    deleteUrl("h1", "atlas", { kind: "github", name: "x" }),
+    "/api/hives/h1/agents/atlas/github-account",
+  );
+});
+
+test("checkLink accepts a good input and names what is wrong otherwise", () => {
+  assert.equal(checkLink("gitlab-com", "https://gitlab.com", "t"), null);
+  assert.equal(checkLink("a", " http://gl.lan:8443/x ", "t"), null);
+  assert.match(checkLink("Bad", "https://gitlab.com", "t"), /label/);
+  assert.match(checkLink("", "https://gitlab.com", "t"), /label/);
+  assert.match(checkLink("a".repeat(64), "https://gitlab.com", "t"), /label/);
+  assert.match(checkLink("a", "gitlab.com", "t"), /URL/);
+  assert.match(checkLink("a", "ftp://gitlab.com", "t"), /URL/);
+  assert.match(checkLink("a", "https://gitlab.com", ""), /token/);
+});
+
+test("a message never contains the token", () => {
+  const msg = checkLink("Bad", "nope", "s3cr3t-value");
+  assert.ok(!String(msg).includes("s3cr3t-value"));
+});