feat: default session name to '{workspace} {tool_type}', improve terminal tab title

ToolStarter:
- Auto-populate Session Name as '{workspace.name} {tool_type.display_name}'
  when a tool type is selected
- Track whether user has manually edited the name (nameEdited flag) to avoid
  overwriting their custom input

Terminal page:
- Fetch instance display_name via getUserSessions for tab title
- Tab title format: '{display_name} {terminal_session_name} — Terminal'
  instead of just '{session_name} — Terminal'

Quality gates: tsc --noEmit pass, npm run build pass, 82/82 tests pass

apps/web/src/api/sessions.ts

@@ -161,6 +161,17 @@ export async function deleteInstance(
 	);
 }
 
+export async function getInstance(
+	projectId: string,
+	repoId: string,
+	instanceId: string,
+): Promise<ToolInstance> {
+	const response = await apiClient.get(
+		`/projects/${projectId}/repositories/${repoId}/instances/${instanceId}`,
+	);
+	return response.data;
+}
+
 export async function getUserSessions(): Promise<Session[]> {
 	const response = await apiClient.get("/users/me/sessions");
 	return response.data.sessions;

apps/web/src/components/features/tool/tool-starter.tsx

@@ -3,7 +3,10 @@
 import { useState, useEffect, useCallback } from "react";
 import { Icon } from "../../icon";
 import { listToolTypes, type ToolType } from "../../../api/tool-types";
-import { listConfigProfiles, type ConfigProfile } from "../../../api/config-profiles";
+import {
+	listConfigProfiles,
+	type ConfigProfile,
+} from "../../../api/config-profiles";
 import { listSSHKeys, type SSHKey } from "../../../api/ssh-keys";
 import type { Workspace } from "../../../types/workspace";
 import type { ToolInstance } from "../../../api/sessions";
@@ -34,6 +37,7 @@ export function ToolStarter({
 	const [selectedSshKeyIds, setSelectedSshKeyIds] = useState<string[]>([]);
 
 	const [displayName, setDisplayName] = useState(workspace.name);
+	const [nameEdited, setNameEdited] = useState(false);
 	const [starting, setStarting] = useState(false);
 	const [error, setError] = useState<string | null>(null);
 
@@ -115,7 +119,9 @@ export function ToolStarter({
 		setStarting(true);
 		setError(null);
 		try {
-			const { createInstance, startInstance } = await import("../../../api/sessions");
+			const { createInstance, startInstance } = await import(
+				"../../../api/sessions"
+			);
 			const instance = await createInstance(
 				workspace.project_id,
 				workspace.repo_id,
@@ -141,7 +147,13 @@ export function ToolStarter({
 		} finally {
 			setStarting(false);
 		}
-	}, [selectedToolTypeId, selectedProfileId, displayName, workspace, onStarted]);
+	}, [
+		selectedToolTypeId,
+		selectedProfileId,
+		displayName,
+		workspace,
+		onStarted,
+	]);
 
 	return (
 		<div className="tool-starter">
@@ -171,8 +183,13 @@ export function ToolStarter({
 					id="tool-type"
 					value={selectedToolTypeId}
 					onChange={(e) => {
-						setSelectedToolTypeId(e.target.value);
+						const toolId = e.target.value;
+						setSelectedToolTypeId(toolId);
 						setError(null);
+						const tt = toolTypes.find((t) => t.id === toolId);
+						if (tt && !nameEdited) {
+							setDisplayName(`${workspace.name} ${tt.display_name}`);
+						}
 					}}
 					disabled={toolTypesLoading || starting}
 				>
@@ -192,12 +209,15 @@ export function ToolStarter({
 			<div className="form-group">
 				<label htmlFor="session-name">Session Name</label>
 				<input
-						id="session-name"
-						type="text"
-						value={displayName}
-						onChange={(e) => setDisplayName(e.target.value)}
-						placeholder="My dev environment"
-						disabled={starting}
+					id="session-name"
+					type="text"
+					value={displayName}
+					onChange={(e) => {
+						setDisplayName(e.target.value);
+						setNameEdited(true);
+					}}
+					placeholder="My dev environment"
+					disabled={starting}
 				/>
 			</div>
 

apps/web/src/hooks/use-terminal-page.ts

@@ -9,6 +9,7 @@ import { useTerminalSessions } from "./use-terminal-sessions";
 import type { TerminalSession } from "../api/terminal";
 import type { ModifierKey } from "./use-special-keys";
 
+
 const SESSIONS_TO_INFO = (sessions: TerminalSession[]): TerminalSessionInfo[] =>
 	sessions.map((s) => ({
 		id: s.id,
@@ -45,6 +46,10 @@ export const useTerminalPage = () => {
 	const { isOpen: isKeyboardOpen, height: keyboardHeight } =
 		useVirtualKeyboard();
 
+	const [instanceDisplayName, setInstanceDisplayName] = useState<string | null>(
+		null,
+	);
+
 	const {
 		sessions,
 		activeSessionId,
@@ -57,6 +62,26 @@ export const useTerminalPage = () => {
 		error,
 	} = useTerminalSessions(instanceId ?? "");
 
+	// Fetch instance details for tab title
+	useEffect(() => {
+		if (!instanceId) return;
+		const load = async () => {
+			try {
+				// Try to find instance in user sessions first
+				const { getUserSessions } = await import("../api/sessions");
+				const allSessions = await getUserSessions();
+				const match = allSessions.find((s) => s.id === instanceId);
+				if (match) {
+					setInstanceDisplayName(match.display_name);
+					return;
+				}
+			} catch {
+				// ignore
+			}
+		};
+		void load();
+	}, [instanceId]);
+
 	// Auto-create default session
 	useEffect(() => {
 		if (!loading && sessions.length === 0 && !error && instanceId) {
@@ -71,12 +96,13 @@ export const useTerminalPage = () => {
 			return;
 		}
 		const active = sessions.find((s) => s.id === activeSessionId);
-		const name = active?.name ?? `Instance ${instanceId.slice(0, 8)}`;
-		document.title = `${name} — Terminal — Headquarter`;
+		const sessionName = active?.name ?? "Session";
+		const baseName = instanceDisplayName ?? `Instance ${instanceId.slice(0, 8)}`;
+		document.title = `${baseName} ${sessionName} — Terminal — Headquarter`;
 		return () => {
 			document.title = "Headquarter";
 		};
-	}, [instanceId, activeSessionId, sessions]);
+	}, [instanceId, activeSessionId, sessions, instanceDisplayName]);
 
 	// Sync refs with sessions
 	useEffect(() => {