diff --git a/frontend/packages/swarm-ui/src/agent/AgentTypes.ts b/frontend/packages/swarm-ui/src/agent/AgentTypes.ts
index dbcc29d4..1969c63b 100644
--- a/frontend/packages/swarm-ui/src/agent/AgentTypes.ts
+++ b/frontend/packages/swarm-ui/src/agent/AgentTypes.ts
@@ -43,6 +43,17 @@ export interface AgentRow {
   // no header since swarm-controller started, or an agent that does not
   // send the flag — not known, so not "needs login".
   needs_login: boolean | null;
+  // The archetype the agent is built from; `null` for a custom agent.
+  archetype: { source: string; name: string } | null;
+}
+
+// "Turn into custom" is offered to an archetype agent whose hive is known and
+// that has not been destroyed: the controller places the conversion on that
+// hive.
+export function canTurnIntoCustom(
+  row: Pick<AgentRow, "archetype" | "hive" | "wanted">,
+): boolean {
+  return !!row.archetype && !!row.hive && row.wanted !== "destroyed";
 }
 
 // Only an agent that said so gets the badge; `null` shows nothing.
diff --git a/frontend/packages/swarm-ui/src/agent/detail/AgentDetail.tsx b/frontend/packages/swarm-ui/src/agent/detail/AgentDetail.tsx
index 70cdaf42..bae373ef 100644
--- a/frontend/packages/swarm-ui/src/agent/detail/AgentDetail.tsx
+++ b/frontend/packages/swarm-ui/src/agent/detail/AgentDetail.tsx
@@ -11,6 +11,7 @@
 // change or a link made here shows wherever else the same row is drawn.
 import { ApiErrorPanel } from "@hive/shared/api-error-panel.js";
 import { Badge } from "@hive/shared/badge.js";
+import { Button } from "../../ui/button/Button.js";
 import { RelativeTime } from "../../ui/relative-time/RelativeTime.js";
 import type { AgentActions } from "../roster/AgentActions.js";
 import { AgentInference } from "./AgentInference.js";
@@ -20,7 +21,7 @@ import { AgentPermissions } from "./AgentPermissions.js";
 import { AllowedDomains } from "./AllowedDomains.js";
 import { AgentStateRow } from "./AgentStateRow.js";
 import { AgentTermPreview } from "../terminal/AgentTermPreview.js";
-import { FRESHNESS, type AgentRow } from "../AgentTypes.js";
+import { canTurnIntoCustom, FRESHNESS, type AgentRow } from "../AgentTypes.js";
 import { LinkAccountMenu } from "./LinkAccountMenu.js";
 import { LinkedAccounts } from "./LinkedAccounts.js";
 import { LazyDisclosure } from "../../ui/disclosure/LazyDisclosure.js";
@@ -90,7 +91,13 @@ function HeaderRows({
   );
 }
 
-function OverviewRows({ row }: { row: AgentRow }) {
+function OverviewRows({
+  row,
+  actions,
+}: {
+  row: AgentRow;
+  actions: AgentActions;
+}) {
   return (
     <>
       <dt>state</dt>
@@ -122,6 +129,25 @@ function OverviewRows({ row }: { row: AgentRow }) {
           "—"
         )}
       </dd>
+      {row.archetype ? (
+        <>
+          <dt>archetype</dt>
+          <dd>
+            {row.archetype.source}/{row.archetype.name}
+            {canTurnIntoCustom(row) ? (
+              <>
+                {" "}
+                <Button
+                  disabled={actions.pendingAgents.has(row.name)}
+                  onClick={() => actions.requestCustom(row)}
+                >
+                  turn into custom
+                </Button>
+              </>
+            ) : null}
+          </dd>
+        </>
+      ) : null}
     </>
   );
 }
@@ -211,7 +237,7 @@ function SectionBody({
     case "overview":
       return (
         <dl class="ui-agent-detail-fields">
-          <OverviewRows row={row} />
+          <OverviewRows row={row} actions={actions} />
         </dl>
       );
     case "settings":
@@ -272,7 +298,7 @@ export function AgentDetail({
     <div class="ui-agent-detail">
       <dl class="ui-agent-detail-fields">
         <HeaderRows row={row} actions={actions} />
-        <OverviewRows row={row} />
+        <OverviewRows row={row} actions={actions} />
         <SettingsRows agent={row.name} />
         <AccountsRows row={row} actions={actions} />
       </dl>
diff --git a/frontend/packages/swarm-ui/src/agent/roster/AgentActions.tsx b/frontend/packages/swarm-ui/src/agent/roster/AgentActions.tsx
index 2e0e8f50..f56abea7 100644
--- a/frontend/packages/swarm-ui/src/agent/roster/AgentActions.tsx
+++ b/frontend/packages/swarm-ui/src/agent/roster/AgentActions.tsx
@@ -71,6 +71,7 @@ export interface AgentActions {
   selectOffline: (row: AgentRow) => void;
   selectPaused: (row: AgentRow) => void;
   requestDestroy: (row: AgentRow) => void;
+  requestCustom: (row: AgentRow) => void;
   openLink: (row: AgentRow, kind: LinkKind) => void;
   /** The confirm and link dialogs; render once, anywhere. */
   dialogs: ComponentChildren;
@@ -94,6 +95,7 @@ export function useAgentActions(
     row: AgentRow;
     state: "offline" | "paused";
   } | null>(null);
+  const [customTarget, setCustomTarget] = useState<AgentRow | null>(null);
   const [matrixTarget, setMatrixTarget] = useState<AgentRow | null>(null);
   const [forgeTarget, setForgeTarget] = useState<AgentRow | null>(null);
   const [githubTarget, setGithubTarget] = useState<AgentRow | null>(null);
@@ -172,6 +174,38 @@ export function useAgentActions(
     await declareState(row, "destroyed");
   }
 
+  // The conversion is queued as a job graph; the roster shows the agent as
+  // custom once it has run, so a success needs no handling here.
+  async function turnIntoCustom(row: AgentRow) {
+    setCustomTarget(null);
+    setPendingAgents((prev) => new Set(prev).add(row.name));
+    setActionErrors((prev) => {
+      const next = new Map(prev);
+      next.delete(row.name);
+      return next;
+    });
+    try {
+      const res = await fetch(
+        `/api/agents/${encodeURIComponent(row.name)}/custom`,
+        { method: "POST" },
+      );
+      if (!res.ok) {
+        const problem = await readApiError(res);
+        setActionErrors((prev) => new Map(prev).set(row.name, problem));
+      }
+    } catch (e: unknown) {
+      setActionErrors((prev) =>
+        new Map(prev).set(row.name, { detail: String(e) }),
+      );
+    } finally {
+      setPendingAgents((prev) => {
+        const next = new Set(prev);
+        next.delete(row.name);
+        return next;
+      });
+    }
+  }
+
   const dialogs = (
     <>
       <Dialog
@@ -248,6 +282,22 @@ export function useAgentActions(
           ? CONFIRM_COPY[confirmTarget.state].message(confirmTarget.row.name)
           : null}
       </ConfirmDialog>
+      <ConfirmDialog
+        open={customTarget !== null}
+        label="turn into custom"
+        onCancel={() => setCustomTarget(null)}
+        onConfirm={() => customTarget && void turnIntoCustom(customTarget)}
+        confirmLabel="turn into custom"
+      >
+        {customTarget ? (
+          <p>
+            Turn <strong>{customTarget.name}</strong> into a custom agent? It
+            gets its own config repo, which imports the archetype it runs today,
+            and is rebuilt from that repo. Keeping the config current is then up
+            to the repo's owner. This is not reversible from here.
+          </p>
+        ) : null}
+      </ConfirmDialog>
       <ConfirmDialog
         open={destroyTarget !== null}
         label="destroy agent"
@@ -276,6 +326,7 @@ export function useAgentActions(
     selectOffline: (row) => setConfirmTarget({ row, state: "offline" }),
     selectPaused: (row) => setConfirmTarget({ row, state: "paused" }),
     requestDestroy: setDestroyTarget,
+    requestCustom: setCustomTarget,
     openLink: (row, kind) => {
       if (kind === "matrix") setMatrixTarget(row);
       else if (kind === "forge") setForgeTarget(row);
diff --git a/frontend/packages/swarm-ui/test/agent-types.test.mjs b/frontend/packages/swarm-ui/test/agent-types.test.mjs
index 758d8dc6..ea059531 100644
--- a/frontend/packages/swarm-ui/test/agent-types.test.mjs
+++ b/frontend/packages/swarm-ui/test/agent-types.test.mjs
@@ -3,7 +3,10 @@
 // imported as it is.
 import assert from "node:assert/strict";
 import { test } from "node:test";
-import { showsLoginNeeded } from "../src/agent/AgentTypes.ts";
+import {
+  canTurnIntoCustom,
+  showsLoginNeeded,
+} from "../src/agent/AgentTypes.ts";
 
 test("an agent that says it needs a login gets the badge", () => {
   assert.equal(showsLoginNeeded({ needs_login: true }), true);
@@ -17,3 +20,25 @@ test("an agent that has not said gets none", () => {
   assert.equal(showsLoginNeeded({ needs_login: null }), false);
   assert.equal(showsLoginNeeded({}), false);
 });
+
+test("turn into custom is offered to a placed archetype agent only", () => {
+  const archetype = { source: "hyperhive", name: "reviewer" };
+  assert.equal(
+    canTurnIntoCustom({ archetype, hive: "alpha", wanted: "up" }),
+    true,
+  );
+  // A custom agent has no archetype to turn from.
+  assert.equal(
+    canTurnIntoCustom({ archetype: null, hive: "alpha", wanted: "up" }),
+    false,
+  );
+  // The controller places the conversion on a hive, so one is needed.
+  assert.equal(
+    canTurnIntoCustom({ archetype, hive: null, wanted: "up" }),
+    false,
+  );
+  assert.equal(
+    canTurnIntoCustom({ archetype, hive: "alpha", wanted: "destroyed" }),
+    false,
+  );
+});