Merge pull request 'Added team related functionalities' (#4) from team-management into dev

Reviewed-on: wrenn/sandbox#4

db/migrations/20260324071453_team_management.sql

@@ -0,0 +1,17 @@
+-- +goose Up
+
+ALTER TABLE teams ADD COLUMN slug TEXT;
+ALTER TABLE teams ADD COLUMN deleted_at TIMESTAMPTZ;
+
+-- Backfill slugs for existing teams using MD5 of their ID.
+-- MD5 returns 32 hex chars; take chars 1-6 and 7-12 to form a 6-6 slug.
+UPDATE teams SET slug = LEFT(MD5(id), 6) || '-' || SUBSTRING(MD5(id), 7, 6);
+
+ALTER TABLE teams ALTER COLUMN slug SET NOT NULL;
+CREATE UNIQUE INDEX idx_teams_slug ON teams(slug);
+
+-- +goose Down
+
+DROP INDEX idx_teams_slug;
+ALTER TABLE teams DROP COLUMN deleted_at;
+ALTER TABLE teams DROP COLUMN slug;

db/queries/sandboxes.sql

@@ -51,3 +51,8 @@ UPDATE sandboxes
 SET status = $2,
     last_updated = NOW()
 WHERE id = ANY($1::text[]);
+
+-- name: ListActiveSandboxesByTeam :many
+SELECT * FROM sandboxes
+WHERE team_id = $1 AND status IN ('running', 'paused', 'starting')
+ORDER BY created_at DESC;

db/queries/teams.sql

@@ -1,6 +1,6 @@
 -- name: InsertTeam :one
-INSERT INTO teams (id, name)
+INSERT INTO teams (id, name, slug)
-VALUES ($1, $2)
+VALUES ($1, $2, $3)
 RETURNING *;
 
 -- name: GetTeam :one
@@ -24,3 +24,32 @@ SELECT * FROM teams WHERE is_byoc = TRUE ORDER BY created_at;
 
 -- name: GetTeamMembership :one
 SELECT * FROM users_teams WHERE user_id = $1 AND team_id = $2;
+
+-- name: UpdateTeamName :exec
+UPDATE teams SET name = $2 WHERE id = $1 AND deleted_at IS NULL;
+
+-- name: SoftDeleteTeam :exec
+UPDATE teams SET deleted_at = NOW() WHERE id = $1;
+
+-- name: GetTeamBySlug :one
+SELECT * FROM teams WHERE slug = $1 AND deleted_at IS NULL;
+
+-- name: GetTeamsForUser :many
+SELECT t.id, t.name, t.slug, t.is_byoc, t.created_at, t.deleted_at, ut.role
+FROM teams t
+JOIN users_teams ut ON ut.team_id = t.id
+WHERE ut.user_id = $1 AND t.deleted_at IS NULL
+ORDER BY ut.created_at;
+
+-- name: GetTeamMembers :many
+SELECT u.id, u.email, ut.role, ut.created_at AS joined_at
+FROM users_teams ut
+JOIN users u ON u.id = ut.user_id
+WHERE ut.team_id = $1
+ORDER BY ut.created_at;
+
+-- name: UpdateMemberRole :exec
+UPDATE users_teams SET role = $3 WHERE team_id = $1 AND user_id = $2;
+
+-- name: DeleteTeamMember :exec
+DELETE FROM users_teams WHERE team_id = $1 AND user_id = $2;

db/queries/users.sql

@@ -34,3 +34,6 @@ SELECT * FROM admin_permissions WHERE user_id = $1 ORDER BY permission;
 SELECT EXISTS(
     SELECT 1 FROM admin_permissions WHERE user_id = $1 AND permission = $2
 ) AS has_permission;
+
+-- name: SearchUsersByEmailPrefix :many
+SELECT id, email FROM users WHERE email LIKE $1 || '%' ORDER BY email LIMIT 10;

frontend/src/lib/api/team.ts

@@ -0,0 +1,83 @@
+import { apiFetch, type ApiResult } from '$lib/api/client';
+
+export type TeamMember = {
+	user_id: string;
+	email: string;
+	role: 'owner' | 'admin' | 'member';
+	joined_at: string;
+};
+
+export type TeamInfo = {
+	id: string;
+	name: string;
+	slug: string;
+	created_at: string;
+};
+
+export type TeamDetail = {
+	team: TeamInfo;
+	members: TeamMember[];
+};
+
+export type UserSearchResult = {
+	user_id: string;
+	email: string;
+};
+
+export type TeamWithRole = {
+	id: string;
+	name: string;
+	slug: string;
+	created_at: string;
+	role: string;
+};
+
+export async function listTeams(): Promise<ApiResult<TeamWithRole[]>> {
+	return apiFetch('GET', '/api/v1/teams');
+}
+
+export async function createTeam(name: string): Promise<ApiResult<TeamWithRole>> {
+	return apiFetch('POST', '/api/v1/teams', { name });
+}
+
+export async function switchTeam(
+	teamId: string
+): Promise<ApiResult<{ token: string; user_id: string; team_id: string; email: string }>> {
+	return apiFetch('POST', '/api/v1/auth/switch-team', { team_id: teamId });
+}
+
+export async function getTeam(id: string): Promise<ApiResult<TeamDetail>> {
+	return apiFetch('GET', `/api/v1/teams/${id}`);
+}
+
+export async function updateTeam(id: string, name: string): Promise<ApiResult<void>> {
+	return apiFetch('PATCH', `/api/v1/teams/${id}`, { name });
+}
+
+export async function addMember(id: string, email: string): Promise<ApiResult<TeamMember>> {
+	return apiFetch('POST', `/api/v1/teams/${id}/members`, { email });
+}
+
+export async function removeMember(id: string, userId: string): Promise<ApiResult<void>> {
+	return apiFetch('DELETE', `/api/v1/teams/${id}/members/${userId}`);
+}
+
+export async function updateMemberRole(
+	id: string,
+	userId: string,
+	role: 'admin' | 'member'
+): Promise<ApiResult<void>> {
+	return apiFetch('PATCH', `/api/v1/teams/${id}/members/${userId}`, { role });
+}
+
+export async function deleteTeam(id: string): Promise<ApiResult<void>> {
+	return apiFetch('DELETE', `/api/v1/teams/${id}`);
+}
+
+export async function leaveTeam(id: string): Promise<ApiResult<void>> {
+	return apiFetch('POST', `/api/v1/teams/${id}/leave`);
+}
+
+export async function searchUsers(email: string): Promise<ApiResult<UserSearchResult[]>> {
+	return apiFetch('GET', `/api/v1/users/search?email=${encodeURIComponent(email)}`);
+}

frontend/src/lib/components/Sidebar.svelte

@@ -1,7 +1,10 @@
 <script lang="ts">
 	import { page } from '$app/stores';
+	import { onMount } from 'svelte';
 	import { Popover } from 'bits-ui';
 	import { auth } from '$lib/auth.svelte';
+	import { teams as teamsStore } from '$lib/teams.svelte';
+	import { createTeam, switchTeam } from '$lib/api/team';
 	import {
 		IconMonitor,
 		IconBox,
@@ -23,8 +26,14 @@
 
 	let teamPopoverOpen = $state(false);
 
-	const currentTeam = 'default';
+	let currentTeamName = $derived(teamsStore.list.find((t) => t.id === auth.teamId)?.name ?? '');
-	const userName = $derived(auth.email ?? '');
+	let userName = $derived(auth.email ?? '');
+
+	// Create team dialog
+	let showCreateTeam = $state(false);
+	let newTeamName = $state('');
+	let creatingTeam = $state(false);
+	let createTeamError = $state<string | null>(null);
 
 	type NavItem = {
 		label: string;
@@ -39,7 +48,7 @@
 
 	const managementItems: NavItem[] = [
 		{ label: 'Keys', icon: IconKey, href: '/dashboard/keys' },
-		{ label: 'Members', icon: IconMembers, href: '/dashboard/members' },
+		{ label: 'Team', icon: IconMembers, href: '/dashboard/team' },
 		{ label: 'Audit Logs', icon: IconAudit, href: '/dashboard/audit' }
 	];
 
@@ -48,8 +57,6 @@
 		{ label: 'Billing', icon: IconBilling, href: '/dashboard/billing' }
 	];
 
-	const teams = ['default', 'Wrenn Labs', 'Acme Corp'];
-
 	function isActive(href: string): boolean {
 		const p = $page.url.pathname;
 		return p === href || p.startsWith(href + '/');
@@ -59,6 +66,45 @@
 		collapsed = !collapsed;
 		localStorage.setItem('wrenn_sidebar_collapsed', String(collapsed));
 	}
+
+	async function fetchTeams() {
+		await teamsStore.fetch();
+	}
+
+	async function handleSwitchTeam(teamId: string) {
+		if (teamId === auth.teamId) {
+			teamPopoverOpen = false;
+			return;
+		}
+		teamPopoverOpen = false;
+		const result = await switchTeam(teamId);
+		if (result.ok) {
+			auth.login(result.data);
+			window.location.reload();
+		}
+	}
+
+	async function handleCreateTeam() {
+		if (!newTeamName.trim()) return;
+		creatingTeam = true;
+		createTeamError = null;
+		const result = await createTeam(newTeamName.trim());
+		if (result.ok) {
+			const switchResult = await switchTeam(result.data.id);
+			if (switchResult.ok) {
+				auth.login(switchResult.data);
+				window.location.reload();
+			} else {
+				createTeamError = switchResult.error;
+				creatingTeam = false;
+			}
+		} else {
+			createTeamError = result.error;
+			creatingTeam = false;
+		}
+	}
+
+	onMount(fetchTeams);
 </script>
 
 <aside
@@ -97,7 +143,7 @@
 				<div
 					class="flex h-6 w-6 shrink-0 items-center justify-center rounded-[var(--radius-avatar)] bg-[var(--color-bg-4)] text-badge font-bold uppercase text-[var(--color-text-secondary)]"
 				>
-					{currentTeam[0]}
+					{(currentTeamName || '?')[0].toUpperCase()}
 				</div>
 				{#if !collapsed}
 					<div class="min-w-0 flex-1 overflow-hidden whitespace-nowrap">
@@ -107,7 +153,7 @@
 							Team
 						</div>
 						<div class="truncate text-ui text-[var(--color-text-primary)]">
-							{currentTeam}
+							{currentTeamName || '…'}
 						</div>
 					</div>
 					<IconChevron
@@ -130,33 +176,39 @@
 					>
 						Teams
 					</div>
-					{#each teams as team}
+					{#each teamsStore.list as team (team.id)}
 						<button
-							class="flex w-full items-center gap-2.5 rounded-[var(--radius-input)] px-2.5 py-2 text-ui transition-colors duration-150 hover:bg-[var(--color-bg-3)] {team ===
+							class="flex w-full items-center gap-2.5 rounded-[var(--radius-input)] px-2.5 py-2 text-ui transition-colors duration-150 hover:bg-[var(--color-bg-3)] {team.id ===
-							currentTeam
+							auth.teamId
 								? 'bg-[var(--color-accent-glow)]'
 								: ''}"
-							onclick={() => (teamPopoverOpen = false)}
+							onclick={() => handleSwitchTeam(team.id)}
 						>
 							<div
-								class="flex h-5 w-5 items-center justify-center rounded-[var(--radius-avatar)] text-badge font-bold uppercase text-white {team ===
+								class="flex h-5 w-5 items-center justify-center rounded-[var(--radius-avatar)] text-badge font-bold uppercase text-white {team.id ===
-								currentTeam
+								auth.teamId
 									? 'bg-[var(--color-accent)]'
 									: 'bg-[var(--color-bg-5)]'}"
 							>
-								{team[0]}
+								{team.name[0].toUpperCase()}
 							</div>
 							<span
-								class={team === currentTeam
+								class={team.id === auth.teamId
 									? 'font-medium text-[var(--color-text-bright)]'
 									: 'text-[var(--color-text-primary)]'}
 							>
-								{team}
+								{team.name}
 							</span>
 						</button>
 					{/each}
 					<div class="mt-0.5 border-t border-[var(--color-border)] pt-0.5">
 						<button
+							onclick={() => {
+								teamPopoverOpen = false;
+								newTeamName = '';
+								createTeamError = null;
+								showCreateTeam = true;
+							}}
 							class="flex w-full items-center gap-2.5 rounded-[var(--radius-input)] px-2.5 py-2 text-ui text-[var(--color-text-secondary)] transition-colors duration-150 hover:bg-[var(--color-bg-3)] hover:text-[var(--color-text-primary)]"
 						>
 							<IconPlus size={14} />
@@ -293,6 +345,79 @@
 	</div>
 {/snippet}
 
+<!-- Create Team Dialog -->
+{#if showCreateTeam}
+	<div class="fixed inset-0 z-50 flex items-center justify-center">
+		<!-- svelte-ignore a11y_no_static_element_interactions -->
+		<div
+			class="absolute inset-0 bg-black/60"
+			onclick={() => { if (!creatingTeam) showCreateTeam = false; }}
+			onkeydown={(e) => { if (e.key === 'Escape' && !creatingTeam) showCreateTeam = false; }}
+		></div>
+
+		<div
+			class="relative w-full max-w-[380px] rounded-[var(--radius-card)] border border-[var(--color-border-mid)] bg-[var(--color-bg-2)] p-6"
+			style="animation: fadeUp 0.2s ease both"
+		>
+			<h2 class="font-serif text-heading tracking-[-0.02em] text-[var(--color-text-bright)]">
+				Create Team
+			</h2>
+			<p class="mt-1 text-ui text-[var(--color-text-tertiary)]">
+				Choose a name for your new team.
+			</p>
+
+			{#if createTeamError}
+				<div
+					class="mt-4 rounded-[var(--radius-input)] border border-[var(--color-red)]/30 bg-[var(--color-red)]/5 px-3 py-2 text-meta text-[var(--color-red)]"
+				>
+					{createTeamError}
+				</div>
+			{/if}
+
+			<div class="mt-5">
+				<label
+					class="mb-1.5 block text-label font-semibold uppercase tracking-[0.05em] text-[var(--color-text-tertiary)]"
+					for="new-team-name"
+				>
+					Team name
+				</label>
+				<input
+					id="new-team-name"
+					type="text"
+					placeholder="e.g. Acme Engineering"
+					bind:value={newTeamName}
+					onkeydown={(e) => { if (e.key === 'Enter' && !creatingTeam) handleCreateTeam(); }}
+					disabled={creatingTeam}
+					class="w-full rounded-[var(--radius-input)] border border-[var(--color-border)] bg-[var(--color-bg-4)] px-3 py-2 text-ui text-[var(--color-text-bright)] outline-none placeholder:text-[var(--color-text-muted)] transition-colors duration-150 focus:border-[var(--color-accent)] disabled:opacity-60"
+				/>
+			</div>
+
+			<div class="mt-6 flex justify-end gap-3">
+				<button
+					onclick={() => { showCreateTeam = false; }}
+					disabled={creatingTeam}
+					class="rounded-[var(--radius-button)] border border-[var(--color-border)] px-4 py-2 text-ui text-[var(--color-text-secondary)] transition-colors duration-150 hover:border-[var(--color-border-mid)] hover:text-[var(--color-text-primary)] disabled:opacity-50"
+				>
+					Cancel
+				</button>
+				<button
+					onclick={handleCreateTeam}
+					disabled={creatingTeam || !newTeamName.trim()}
+					class="flex items-center gap-2 rounded-[var(--radius-button)] bg-[var(--color-accent)] px-5 py-2 text-ui font-semibold text-white transition-all duration-150 hover:brightness-115 hover:-translate-y-px active:translate-y-0 disabled:opacity-50 disabled:hover:translate-y-0"
+				>
+					{#if creatingTeam}
+						<svg class="animate-spin" width="13" height="13" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+							<path d="M21 12a9 9 0 1 1-6.219-8.56" />
+						</svg>
+						Creating...
+					{:else}
+						Create Team
+					{/if}
+				</button>
+			</div>
+		</div>
+	</div>
+{/if}
 
 <style>
 	@keyframes popoverSlideIn {

frontend/src/lib/teams.svelte.ts

@@ -0,0 +1,31 @@
+import { listTeams, type TeamWithRole } from '$lib/api/team';
+
+function createTeamsStore() {
+	let teams = $state<TeamWithRole[]>([]);
+	let loaded = $state(false);
+
+	return {
+		get list() {
+			return teams;
+		},
+		get loaded() {
+			return loaded;
+		},
+		async fetch() {
+			if (loaded) return;
+			const result = await listTeams();
+			if (result.ok) {
+				teams = result.data;
+				loaded = true;
+			}
+		},
+		// Call after mutating teams (create/switch triggers a full reload, but
+		// adding a team locally avoids a flicker in the popover list).
+		set(newTeams: TeamWithRole[]) {
+			teams = newTeams;
+			loaded = true;
+		}
+	};
+}
+
+export const teams = createTeamsStore();

internal/api/handlers_auth.go

@@ -15,6 +15,10 @@ import (
 	"git.omukk.dev/wrenn/sandbox/internal/id"
 )
 
+type switchTeamRequest struct {
+	TeamID string `json:"team_id"`
+}
+
 type authHandler struct {
 	db        *db.Queries
 	pool      *pgxpool.Pool
@@ -99,6 +103,7 @@ func (h *authHandler) Signup(w http.ResponseWriter, r *http.Request) {
 	if _, err := qtx.InsertTeam(ctx, db.InsertTeamParams{
 		ID:   teamID,
 		Name: req.Email + "'s Team",
+		Slug: id.NewTeamSlug(),
 	}); err != nil {
 		writeError(w, http.StatusInternalServerError, "db_error", "failed to create team")
 		return
@@ -119,7 +124,7 @@ func (h *authHandler) Signup(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	token, err := auth.SignJWT(h.jwtSecret, userID, teamID, req.Email)
+	token, err := auth.SignJWT(h.jwtSecret, userID, teamID, req.Email, "owner")
 	if err != nil {
 		writeError(w, http.StatusInternalServerError, "internal_error", "failed to generate token")
 		return
@@ -174,7 +179,13 @@ func (h *authHandler) Login(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	token, err := auth.SignJWT(h.jwtSecret, user.ID, team.ID, user.Email)
+	membership, err := h.db.GetTeamMembership(ctx, db.GetTeamMembershipParams{UserID: user.ID, TeamID: team.ID})
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, "db_error", "failed to look up membership")
+		return
+	}
+
+	token, err := auth.SignJWT(h.jwtSecret, user.ID, team.ID, user.Email, membership.Role)
 	if err != nil {
 		writeError(w, http.StatusInternalServerError, "internal_error", "failed to generate token")
 		return
@@ -187,3 +198,65 @@ func (h *authHandler) Login(w http.ResponseWriter, r *http.Request) {
 		Email:  user.Email,
 	})
 }
+
+// SwitchTeam handles POST /v1/auth/switch-team.
+// Verifies from DB that the user is a member of the target team, then re-issues
+// a JWT scoped to that team. The JWT's team_id is used as a pre-filter on all
+// subsequent team-scoped requests; DB is the source of truth for actual permissions.
+func (h *authHandler) SwitchTeam(w http.ResponseWriter, r *http.Request) {
+	ac := auth.MustFromContext(r.Context())
+
+	var req switchTeamRequest
+	if err := decodeJSON(r, &req); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid_request", "invalid JSON body")
+		return
+	}
+	if req.TeamID == "" {
+		writeError(w, http.StatusBadRequest, "invalid_request", "team_id is required")
+		return
+	}
+
+	ctx := r.Context()
+
+	// Verify team exists and is not deleted.
+	team, err := h.db.GetTeam(ctx, req.TeamID)
+	if err != nil {
+		if errors.Is(err, pgx.ErrNoRows) {
+			writeError(w, http.StatusNotFound, "not_found", "team not found")
+			return
+		}
+		writeError(w, http.StatusInternalServerError, "db_error", "failed to look up team")
+		return
+	}
+	if team.DeletedAt.Valid {
+		writeError(w, http.StatusNotFound, "not_found", "team not found")
+		return
+	}
+
+	// Verify membership from DB — JWT role is not trusted here.
+	membership, err := h.db.GetTeamMembership(ctx, db.GetTeamMembershipParams{
+		UserID: ac.UserID,
+		TeamID: req.TeamID,
+	})
+	if err != nil {
+		if errors.Is(err, pgx.ErrNoRows) {
+			writeError(w, http.StatusForbidden, "forbidden", "not a member of this team")
+			return
+		}
+		writeError(w, http.StatusInternalServerError, "db_error", "failed to look up membership")
+		return
+	}
+
+	token, err := auth.SignJWT(h.jwtSecret, ac.UserID, req.TeamID, ac.Email, membership.Role)
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, "internal_error", "failed to generate token")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, authResponse{
+		Token:  token,
+		UserID: ac.UserID,
+		TeamID: req.TeamID,
+		Email:  ac.Email,
+	})
+}

internal/api/handlers_oauth.go

@@ -156,7 +156,13 @@ func (h *oauthHandler) Callback(w http.ResponseWriter, r *http.Request) {
 			redirectWithError(w, r, redirectBase, "db_error")
 			return
 		}
-		token, err := auth.SignJWT(h.jwtSecret, user.ID, team.ID, user.Email)
+		membership, err := h.db.GetTeamMembership(ctx, db.GetTeamMembershipParams{UserID: user.ID, TeamID: team.ID})
+		if err != nil {
+			slog.Error("oauth login: failed to get membership", "error", err)
+			redirectWithError(w, r, redirectBase, "db_error")
+			return
+		}
+		token, err := auth.SignJWT(h.jwtSecret, user.ID, team.ID, user.Email, membership.Role)
 		if err != nil {
 			slog.Error("oauth login: failed to sign jwt", "error", err)
 			redirectWithError(w, r, redirectBase, "internal_error")
@@ -219,6 +225,7 @@ func (h *oauthHandler) Callback(w http.ResponseWriter, r *http.Request) {
 	if _, err := qtx.InsertTeam(ctx, db.InsertTeamParams{
 		ID:   teamID,
 		Name: teamName,
+		Slug: id.NewTeamSlug(),
 	}); err != nil {
 		slog.Error("oauth: failed to create team", "error", err)
 		redirectWithError(w, r, redirectBase, "db_error")
@@ -253,7 +260,7 @@ func (h *oauthHandler) Callback(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	token, err := auth.SignJWT(h.jwtSecret, userID, teamID, email)
+	token, err := auth.SignJWT(h.jwtSecret, userID, teamID, email, "owner")
 	if err != nil {
 		slog.Error("oauth: failed to sign jwt", "error", err)
 		redirectWithError(w, r, redirectBase, "internal_error")
@@ -288,7 +295,13 @@ func (h *oauthHandler) retryAsLogin(w http.ResponseWriter, r *http.Request, prov
 		redirectWithError(w, r, redirectBase, "db_error")
 		return
 	}
-	token, err := auth.SignJWT(h.jwtSecret, user.ID, team.ID, user.Email)
+	membership, err := h.db.GetTeamMembership(ctx, db.GetTeamMembershipParams{UserID: user.ID, TeamID: team.ID})
+	if err != nil {
+		slog.Error("oauth: retry login: failed to get membership", "error", err)
+		redirectWithError(w, r, redirectBase, "db_error")
+		return
+	}
+	token, err := auth.SignJWT(h.jwtSecret, user.ID, team.ID, user.Email, membership.Role)
 	if err != nil {
 		slog.Error("oauth: retry login: failed to sign jwt", "error", err)
 		redirectWithError(w, r, redirectBase, "internal_error")

internal/api/handlers_team.go

@@ -0,0 +1,321 @@
+package api
+
+import (
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/go-chi/chi/v5"
+
+	"git.omukk.dev/wrenn/sandbox/internal/auth"
+	"git.omukk.dev/wrenn/sandbox/internal/db"
+	"git.omukk.dev/wrenn/sandbox/internal/service"
+)
+
+type teamHandler struct {
+	svc *service.TeamService
+}
+
+func newTeamHandler(svc *service.TeamService) *teamHandler {
+	return &teamHandler{svc: svc}
+}
+
+// teamResponse is the JSON shape for a team.
+type teamResponse struct {
+	ID        string `json:"id"`
+	Name      string `json:"name"`
+	Slug      string `json:"slug"`
+	CreatedAt string `json:"created_at"`
+}
+
+// teamWithRoleResponse includes the calling user's role.
+type teamWithRoleResponse struct {
+	teamResponse
+	Role string `json:"role"`
+}
+
+type memberResponse struct {
+	UserID   string `json:"user_id"`
+	Email    string `json:"email"`
+	Role     string `json:"role"`
+	JoinedAt string `json:"joined_at,omitempty"`
+}
+
+func teamToResponse(t db.Team) teamResponse {
+	resp := teamResponse{
+		ID:   t.ID,
+		Name: t.Name,
+		Slug: t.Slug,
+	}
+	if t.CreatedAt.Valid {
+		resp.CreatedAt = t.CreatedAt.Time.Format(time.RFC3339)
+	}
+	return resp
+}
+
+func memberInfoToResponse(m service.MemberInfo) memberResponse {
+	return memberResponse{
+		UserID:   m.UserID,
+		Email:    m.Email,
+		Role:     m.Role,
+		JoinedAt: m.JoinedAt.Format(time.RFC3339),
+	}
+}
+
+// requireTeamAccess is an inline check used by every team-scoped handler:
+// the JWT team_id must match the URL {id} before any DB call is made.
+// Returns false and writes 403 if they don't match.
+func requireTeamAccess(w http.ResponseWriter, r *http.Request, ac auth.AuthContext) (string, bool) {
+	teamID := chi.URLParam(r, "id")
+	if ac.TeamID != teamID {
+		writeError(w, http.StatusForbidden, "forbidden", "JWT team does not match requested team; use switch-team first")
+		return "", false
+	}
+	return teamID, true
+}
+
+// List handles GET /v1/teams
+// Returns all teams the authenticated user belongs to.
+func (h *teamHandler) List(w http.ResponseWriter, r *http.Request) {
+	ac := auth.MustFromContext(r.Context())
+
+	teams, err := h.svc.ListTeamsForUser(r.Context(), ac.UserID)
+	if err != nil {
+		status, code, msg := serviceErrToHTTP(err)
+		writeError(w, status, code, msg)
+		return
+	}
+
+	resp := make([]teamWithRoleResponse, len(teams))
+	for i, t := range teams {
+		resp[i] = teamWithRoleResponse{
+			teamResponse: teamToResponse(t.Team),
+			Role:         t.Role,
+		}
+	}
+	writeJSON(w, http.StatusOK, resp)
+}
+
+// Create handles POST /v1/teams
+// Creates a new team owned by the authenticated user.
+func (h *teamHandler) Create(w http.ResponseWriter, r *http.Request) {
+	ac := auth.MustFromContext(r.Context())
+
+	var req struct {
+		Name string `json:"name"`
+	}
+	if err := decodeJSON(r, &req); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid_request", "invalid JSON body")
+		return
+	}
+	req.Name = strings.TrimSpace(req.Name)
+
+	team, err := h.svc.CreateTeam(r.Context(), ac.UserID, req.Name)
+	if err != nil {
+		status, code, msg := serviceErrToHTTP(err)
+		writeError(w, status, code, msg)
+		return
+	}
+
+	writeJSON(w, http.StatusCreated, teamWithRoleResponse{
+		teamResponse: teamToResponse(team.Team),
+		Role:         team.Role,
+	})
+}
+
+// Get handles GET /v1/teams/{id}
+// Returns team info and member list.
+func (h *teamHandler) Get(w http.ResponseWriter, r *http.Request) {
+	ac := auth.MustFromContext(r.Context())
+	teamID, ok := requireTeamAccess(w, r, ac)
+	if !ok {
+		return
+	}
+
+	team, err := h.svc.GetTeam(r.Context(), teamID)
+	if err != nil {
+		status, code, msg := serviceErrToHTTP(err)
+		writeError(w, status, code, msg)
+		return
+	}
+
+	members, err := h.svc.GetMembers(r.Context(), teamID)
+	if err != nil {
+		status, code, msg := serviceErrToHTTP(err)
+		writeError(w, status, code, msg)
+		return
+	}
+
+	memberResp := make([]memberResponse, len(members))
+	for i, m := range members {
+		memberResp[i] = memberInfoToResponse(m)
+	}
+
+	writeJSON(w, http.StatusOK, map[string]any{
+		"team":    teamToResponse(team),
+		"members": memberResp,
+	})
+}
+
+// Rename handles PATCH /v1/teams/{id}
+// Renames the team. Requires admin or owner role (verified from DB).
+func (h *teamHandler) Rename(w http.ResponseWriter, r *http.Request) {
+	ac := auth.MustFromContext(r.Context())
+	teamID, ok := requireTeamAccess(w, r, ac)
+	if !ok {
+		return
+	}
+
+	var req struct {
+		Name string `json:"name"`
+	}
+	if err := decodeJSON(r, &req); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid_request", "invalid JSON body")
+		return
+	}
+	req.Name = strings.TrimSpace(req.Name)
+
+	if err := h.svc.RenameTeam(r.Context(), teamID, ac.UserID, req.Name); err != nil {
+		status, code, msg := serviceErrToHTTP(err)
+		writeError(w, status, code, msg)
+		return
+	}
+
+	w.WriteHeader(http.StatusNoContent)
+}
+
+// Delete handles DELETE /v1/teams/{id}
+// Soft-deletes the team and destroys active sandboxes. Owner only.
+func (h *teamHandler) Delete(w http.ResponseWriter, r *http.Request) {
+	ac := auth.MustFromContext(r.Context())
+	teamID, ok := requireTeamAccess(w, r, ac)
+	if !ok {
+		return
+	}
+
+	if err := h.svc.DeleteTeam(r.Context(), teamID, ac.UserID); err != nil {
+		status, code, msg := serviceErrToHTTP(err)
+		writeError(w, status, code, msg)
+		return
+	}
+
+	w.WriteHeader(http.StatusNoContent)
+}
+
+// ListMembers handles GET /v1/teams/{id}/members
+func (h *teamHandler) ListMembers(w http.ResponseWriter, r *http.Request) {
+	ac := auth.MustFromContext(r.Context())
+	teamID, ok := requireTeamAccess(w, r, ac)
+	if !ok {
+		return
+	}
+
+	members, err := h.svc.GetMembers(r.Context(), teamID)
+	if err != nil {
+		status, code, msg := serviceErrToHTTP(err)
+		writeError(w, status, code, msg)
+		return
+	}
+
+	resp := make([]memberResponse, len(members))
+	for i, m := range members {
+		resp[i] = memberInfoToResponse(m)
+	}
+	writeJSON(w, http.StatusOK, resp)
+}
+
+// AddMember handles POST /v1/teams/{id}/members
+// Adds a user by email. Requires admin or owner (verified from DB).
+func (h *teamHandler) AddMember(w http.ResponseWriter, r *http.Request) {
+	ac := auth.MustFromContext(r.Context())
+	teamID, ok := requireTeamAccess(w, r, ac)
+	if !ok {
+		return
+	}
+
+	var req struct {
+		Email string `json:"email"`
+	}
+	if err := decodeJSON(r, &req); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid_request", "invalid JSON body")
+		return
+	}
+	req.Email = strings.TrimSpace(strings.ToLower(req.Email))
+	if req.Email == "" {
+		writeError(w, http.StatusBadRequest, "invalid_request", "email is required")
+		return
+	}
+
+	member, err := h.svc.AddMember(r.Context(), teamID, ac.UserID, req.Email)
+	if err != nil {
+		status, code, msg := serviceErrToHTTP(err)
+		writeError(w, status, code, msg)
+		return
+	}
+
+	writeJSON(w, http.StatusCreated, memberInfoToResponse(member))
+}
+
+// RemoveMember handles DELETE /v1/teams/{id}/members/{uid}
+// Removes a member. Requires admin or owner (verified from DB). Owner cannot be removed.
+func (h *teamHandler) RemoveMember(w http.ResponseWriter, r *http.Request) {
+	ac := auth.MustFromContext(r.Context())
+	teamID, ok := requireTeamAccess(w, r, ac)
+	if !ok {
+		return
+	}
+	targetUserID := chi.URLParam(r, "uid")
+
+	if err := h.svc.RemoveMember(r.Context(), teamID, ac.UserID, targetUserID); err != nil {
+		status, code, msg := serviceErrToHTTP(err)
+		writeError(w, status, code, msg)
+		return
+	}
+
+	w.WriteHeader(http.StatusNoContent)
+}
+
+// UpdateMemberRole handles PATCH /v1/teams/{id}/members/{uid}
+// Changes a member's role (admin or member). Owner's role cannot be changed.
+func (h *teamHandler) UpdateMemberRole(w http.ResponseWriter, r *http.Request) {
+	ac := auth.MustFromContext(r.Context())
+	teamID, ok := requireTeamAccess(w, r, ac)
+	if !ok {
+		return
+	}
+	targetUserID := chi.URLParam(r, "uid")
+
+	var req struct {
+		Role string `json:"role"`
+	}
+	if err := decodeJSON(r, &req); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid_request", "invalid JSON body")
+		return
+	}
+
+	if err := h.svc.UpdateMemberRole(r.Context(), teamID, ac.UserID, targetUserID, req.Role); err != nil {
+		status, code, msg := serviceErrToHTTP(err)
+		writeError(w, status, code, msg)
+		return
+	}
+
+	w.WriteHeader(http.StatusNoContent)
+}
+
+// Leave handles POST /v1/teams/{id}/leave
+// Removes the calling user from the team. Owner cannot leave.
+func (h *teamHandler) Leave(w http.ResponseWriter, r *http.Request) {
+	ac := auth.MustFromContext(r.Context())
+	teamID, ok := requireTeamAccess(w, r, ac)
+	if !ok {
+		return
+	}
+
+	if err := h.svc.LeaveTeam(r.Context(), teamID, ac.UserID); err != nil {
+		status, code, msg := serviceErrToHTTP(err)
+		writeError(w, status, code, msg)
+		return
+	}
+
+	w.WriteHeader(http.StatusNoContent)
+}

internal/api/handlers_users.go

@@ -0,0 +1,47 @@
+package api
+
+import (
+	"net/http"
+	"strings"
+
+	"git.omukk.dev/wrenn/sandbox/internal/auth"
+	"git.omukk.dev/wrenn/sandbox/internal/service"
+)
+
+type usersHandler struct {
+	svc *service.TeamService
+}
+
+func newUsersHandler(svc *service.TeamService) *usersHandler {
+	return &usersHandler{svc: svc}
+}
+
+// Search handles GET /v1/users/search?email=<prefix>
+// Returns up to 10 users whose email starts with the given prefix.
+// The prefix must be at least 3 characters long.
+func (h *usersHandler) Search(w http.ResponseWriter, r *http.Request) {
+	auth.MustFromContext(r.Context()) // ensure authenticated
+
+	prefix := strings.TrimSpace(r.URL.Query().Get("email"))
+	if len(prefix) < 3 {
+		writeError(w, http.StatusBadRequest, "invalid_request", "email prefix must be at least 3 characters")
+		return
+	}
+
+	results, err := h.svc.SearchUsersByEmailPrefix(r.Context(), prefix)
+	if err != nil {
+		status, code, msg := serviceErrToHTTP(err)
+		writeError(w, status, code, msg)
+		return
+	}
+
+	type userResult struct {
+		UserID string `json:"user_id"`
+		Email  string `json:"email"`
+	}
+	resp := make([]userResult, len(results))
+	for i, u := range results {
+		resp[i] = userResult{UserID: u.ID, Email: u.Email}
+	}
+	writeJSON(w, http.StatusOK, resp)
+}

internal/api/middleware_apikey.go

@@ -1,38 +0,0 @@
-package api
-
-import (
-	"log/slog"
-	"net/http"
-
-	"git.omukk.dev/wrenn/sandbox/internal/auth"
-	"git.omukk.dev/wrenn/sandbox/internal/db"
-)
-
-// requireAPIKey validates the X-API-Key header, looks up the SHA-256 hash in DB,
-// and stamps TeamID into the request context.
-func requireAPIKey(queries *db.Queries) func(http.Handler) http.Handler {
-	return func(next http.Handler) http.Handler {
-		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-			key := r.Header.Get("X-API-Key")
-			if key == "" {
-				writeError(w, http.StatusUnauthorized, "unauthorized", "X-API-Key header required")
-				return
-			}
-
-			hash := auth.HashAPIKey(key)
-			row, err := queries.GetAPIKeyByHash(r.Context(), hash)
-			if err != nil {
-				writeError(w, http.StatusUnauthorized, "unauthorized", "invalid API key")
-				return
-			}
-
-			// Best-effort update of last_used timestamp.
-			if err := queries.UpdateAPIKeyLastUsed(r.Context(), row.ID); err != nil {
-				slog.Warn("failed to update api key last_used", "key_id", row.ID, "error", err)
-			}
-
-			ctx := auth.WithAuthContext(r.Context(), auth.AuthContext{TeamID: row.TeamID})
-			next.ServeHTTP(w, r.WithContext(ctx))
-		})
-	}
-}

internal/api/middleware_auth.go

@@ -45,6 +45,7 @@ func requireAPIKeyOrJWT(queries *db.Queries, jwtSecret []byte) func(http.Handler
 					TeamID: claims.TeamID,
 					UserID: claims.Subject,
 					Email:  claims.Email,
+					Role:   claims.Role,
 				})
 				next.ServeHTTP(w, r.WithContext(ctx))
 				return

internal/api/middleware_jwt.go

@@ -29,6 +29,7 @@ func requireJWT(secret []byte) func(http.Handler) http.Handler {
 				TeamID: claims.TeamID,
 				UserID: claims.Subject,
 				Email:  claims.Email,
+				Role:   claims.Role,
 			})
 			next.ServeHTTP(w, r.WithContext(ctx))
 		})

internal/api/openapi.yaml

@@ -42,6 +42,47 @@ paths:
               schema:
                 $ref: "#/components/schemas/Error"
 
+  /v1/auth/switch-team:
+    post:
+      summary: Switch active team
+      operationId: switchTeam
+      tags: [auth]
+      security:
+        - bearerAuth: []
+      description: |
+        Re-issues a JWT scoped to a different team. The user must be a member of
+        the target team (verified from DB). Use the returned token for subsequent
+        requests to that team's resources.
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              type: object
+              required: [team_id]
+              properties:
+                team_id:
+                  type: string
+      responses:
+        "200":
+          description: New JWT issued for the target team
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/AuthResponse"
+        "403":
+          description: Not a member of this team
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+        "404":
+          description: Team not found
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+
   /v1/auth/login:
     post:
       summary: Log in with email and password
@@ -195,6 +236,340 @@ paths:
         "204":
           description: API key deleted
 
+  /v1/users/search:
+    get:
+      summary: Search users by email prefix
+      operationId: searchUsers
+      tags: [users]
+      security:
+        - bearerAuth: []
+      description: |
+        Returns up to 10 users whose email starts with the given prefix.
+        The prefix must contain "@". Intended for the add-member UI autocomplete.
+      parameters:
+        - name: email
+          in: query
+          required: true
+          schema:
+            type: string
+          description: Email prefix (must contain "@", e.g. "alice@")
+      responses:
+        "200":
+          description: Matching users
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: "#/components/schemas/UserSearchResult"
+        "400":
+          description: Prefix does not contain "@"
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+
+  /v1/teams:
+    get:
+      summary: List teams for the authenticated user
+      operationId: listTeams
+      tags: [teams]
+      security:
+        - bearerAuth: []
+      responses:
+        "200":
+          description: Teams the user belongs to, each with their role
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: "#/components/schemas/TeamWithRole"
+
+    post:
+      summary: Create a new team
+      operationId: createTeam
+      tags: [teams]
+      security:
+        - bearerAuth: []
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              type: object
+              required: [name]
+              properties:
+                name:
+                  type: string
+                  description: 1-128 chars; A-Z a-z 0-9 space _
+      responses:
+        "201":
+          description: Team created (caller is owner)
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/TeamWithRole"
+        "400":
+          description: Invalid team name
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+
+  /v1/teams/{id}:
+    parameters:
+      - name: id
+        in: path
+        required: true
+        schema:
+          type: string
+        description: Team ID (must match the JWT's team_id)
+
+    get:
+      summary: Get team info and member list
+      operationId: getTeam
+      tags: [teams]
+      security:
+        - bearerAuth: []
+      responses:
+        "200":
+          description: Team details with members
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/TeamDetail"
+        "403":
+          description: JWT team does not match requested team
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+        "404":
+          description: Team not found
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+
+    patch:
+      summary: Rename the team
+      operationId: renameTeam
+      tags: [teams]
+      security:
+        - bearerAuth: []
+      description: Admin or owner role required (verified from DB).
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              type: object
+              required: [name]
+              properties:
+                name:
+                  type: string
+      responses:
+        "204":
+          description: Renamed
+        "400":
+          description: Invalid team name
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+        "403":
+          description: Insufficient role
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+
+    delete:
+      summary: Delete the team
+      operationId: deleteTeam
+      tags: [teams]
+      security:
+        - bearerAuth: []
+      description: |
+        Owner only. Soft-deletes the team and destroys all running/paused/starting
+        sandboxes. All DB records are preserved. The team slug is permanently reserved.
+      responses:
+        "204":
+          description: Team deleted
+        "403":
+          description: Caller is not the owner
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+
+  /v1/teams/{id}/members:
+    parameters:
+      - name: id
+        in: path
+        required: true
+        schema:
+          type: string
+
+    get:
+      summary: List team members
+      operationId: listTeamMembers
+      tags: [teams]
+      security:
+        - bearerAuth: []
+      responses:
+        "200":
+          description: Members with roles
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: "#/components/schemas/TeamMember"
+
+    post:
+      summary: Add a member by email
+      operationId: addTeamMember
+      tags: [teams]
+      security:
+        - bearerAuth: []
+      description: Admin or owner role required. User is added instantly as a member.
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              type: object
+              required: [email]
+              properties:
+                email:
+                  type: string
+                  format: email
+      responses:
+        "201":
+          description: Member added
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/TeamMember"
+        "403":
+          description: Insufficient role
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+        "404":
+          description: No account with that email
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+        "400":
+          description: User is already a member
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+
+  /v1/teams/{id}/members/{uid}:
+    parameters:
+      - name: id
+        in: path
+        required: true
+        schema:
+          type: string
+      - name: uid
+        in: path
+        required: true
+        schema:
+          type: string
+        description: Target user ID
+
+    patch:
+      summary: Update member role
+      operationId: updateMemberRole
+      tags: [teams]
+      security:
+        - bearerAuth: []
+      description: |
+        Admin or owner required. Valid target roles: admin, member.
+        The owner's role cannot be changed.
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              type: object
+              required: [role]
+              properties:
+                role:
+                  type: string
+                  enum: [admin, member]
+      responses:
+        "204":
+          description: Role updated
+        "403":
+          description: Insufficient role or attempt to modify owner
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+        "404":
+          description: User is not a member
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+
+    delete:
+      summary: Remove a member
+      operationId: removeTeamMember
+      tags: [teams]
+      security:
+        - bearerAuth: []
+      description: Admin or owner required. Owner cannot be removed.
+      responses:
+        "204":
+          description: Member removed
+        "403":
+          description: Insufficient role or attempt to remove owner
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+        "404":
+          description: User is not a member
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+
+  /v1/teams/{id}/leave:
+    parameters:
+      - name: id
+        in: path
+        required: true
+        schema:
+          type: string
+
+    post:
+      summary: Leave the team
+      operationId: leaveTeam
+      tags: [teams]
+      security:
+        - bearerAuth: []
+      description: The owner cannot leave; they must delete the team instead.
+      responses:
+        "204":
+          description: Left the team
+        "403":
+          description: Owner cannot leave
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+
   /v1/sandboxes:
     post:
       summary: Create a sandbox
@@ -1338,6 +1713,61 @@ components:
         tag:
           type: string
 
+    UserSearchResult:
+      type: object
+      properties:
+        user_id:
+          type: string
+        email:
+          type: string
+
+    Team:
+      type: object
+      properties:
+        id:
+          type: string
+        name:
+          type: string
+        slug:
+          type: string
+          description: Immutable 12-char hex slug (e.g. a1b2c3-d1e2f3)
+        created_at:
+          type: string
+          format: date-time
+
+    TeamWithRole:
+      allOf:
+        - $ref: "#/components/schemas/Team"
+        - type: object
+          properties:
+            role:
+              type: string
+              enum: [owner, admin, member]
+
+    TeamMember:
+      type: object
+      properties:
+        user_id:
+          type: string
+        email:
+          type: string
+        role:
+          type: string
+          enum: [owner, admin, member]
+        joined_at:
+          type: string
+          format: date-time
+
+    TeamDetail:
+      type: object
+      properties:
+        team:
+          $ref: "#/components/schemas/Team"
+        members:
+          type: array
+          items:
+            $ref: "#/components/schemas/TeamMember"
+
     Error:
       type: object
       properties:

internal/api/server.go

@@ -33,6 +33,7 @@ func New(queries *db.Queries, agent hostagentv1connect.HostAgentServiceClient, p
 	apiKeySvc := &service.APIKeyService{DB: queries}
 	templateSvc := &service.TemplateService{DB: queries}
 	hostSvc := &service.HostService{DB: queries, Redis: rdb, JWT: jwtSecret}
+	teamSvc := &service.TeamService{DB: queries, Pool: pool, Agent: agent}
 
 	sandbox := newSandboxHandler(sandboxSvc)
 	exec := newExecHandler(queries, agent)
@@ -44,6 +45,8 @@ func New(queries *db.Queries, agent hostagentv1connect.HostAgentServiceClient, p
 	oauthH := newOAuthHandler(queries, pool, jwtSecret, oauthRegistry, oauthRedirectURL)
 	apiKeys := newAPIKeyHandler(apiKeySvc)
 	hostH := newHostHandler(hostSvc, queries)
+	teamH := newTeamHandler(teamSvc)
+	usersH := newUsersHandler(teamSvc)
 
 	// OpenAPI spec and docs.
 	r.Get("/openapi.yaml", serveOpenAPI)
@@ -55,6 +58,9 @@ func New(queries *db.Queries, agent hostagentv1connect.HostAgentServiceClient, p
 	r.Get("/auth/oauth/{provider}", oauthH.Redirect)
 	r.Get("/auth/oauth/{provider}/callback", oauthH.Callback)
 
+	// JWT-authenticated: switch active team.
+	r.With(requireJWT(jwtSecret)).Post("/v1/auth/switch-team", authH.SwitchTeam)
+
 	// JWT-authenticated: API key management.
 	r.Route("/v1/api-keys", func(r chi.Router) {
 		r.Use(requireJWT(jwtSecret))
@@ -63,6 +69,26 @@ func New(queries *db.Queries, agent hostagentv1connect.HostAgentServiceClient, p
 		r.Delete("/{id}", apiKeys.Delete)
 	})
 
+	// JWT-authenticated: team management.
+	r.Route("/v1/teams", func(r chi.Router) {
+		r.Use(requireJWT(jwtSecret))
+		r.Get("/", teamH.List)
+		r.Post("/", teamH.Create)
+		r.Route("/{id}", func(r chi.Router) {
+			r.Get("/", teamH.Get)
+			r.Patch("/", teamH.Rename)
+			r.Delete("/", teamH.Delete)
+			r.Get("/members", teamH.ListMembers)
+			r.Post("/members", teamH.AddMember)
+			r.Patch("/members/{uid}", teamH.UpdateMemberRole)
+			r.Delete("/members/{uid}", teamH.RemoveMember)
+			r.Post("/leave", teamH.Leave)
+		})
+	})
+
+	// JWT-authenticated: user search (for add-member UI).
+	r.With(requireJWT(jwtSecret)).Get("/v1/users/search", usersH.Search)
+
 	// Sandbox lifecycle: accepts API key or JWT bearer token.
 	r.Route("/v1/sandboxes", func(r chi.Router) {
 		r.Use(requireAPIKeyOrJWT(queries, jwtSecret))

internal/auth/context.go

@@ -11,6 +11,7 @@ type AuthContext struct {
 	TeamID string
 	UserID string // empty when authenticated via API key
 	Email  string // empty when authenticated via API key
+	Role   string // owner, admin, or member; empty when authenticated via API key
 }
 
 // WithAuthContext returns a new context with the given AuthContext.

internal/auth/jwt.go

@@ -14,15 +14,17 @@ const hostJWTExpiry = 8760 * time.Hour // 1 year
 type Claims struct {
 	Type   string `json:"typ,omitempty"` // empty for user tokens; used to reject host tokens
 	TeamID string `json:"team_id"`
+	Role   string `json:"role"` // owner, admin, or member within TeamID
 	Email  string `json:"email"`
 	jwt.RegisteredClaims
 }
 
 // SignJWT signs a new 6-hour JWT for the given user.
-func SignJWT(secret []byte, userID, teamID, email string) (string, error) {
+func SignJWT(secret []byte, userID, teamID, email, role string) (string, error) {
 	now := time.Now()
 	claims := Claims{
 		TeamID: teamID,
+		Role:   role,
 		Email:  email,
 		RegisteredClaims: jwt.RegisteredClaims{
 			Subject:   userID,

internal/db/models.go

@@ -80,6 +80,8 @@ type Team struct {
 	Name      string             `json:"name"`
 	CreatedAt pgtype.Timestamptz `json:"created_at"`
 	IsByoc    bool               `json:"is_byoc"`
+	Slug      string             `json:"slug"`
+	DeletedAt pgtype.Timestamptz `json:"deleted_at"`
 }
 
 type TeamApiKey struct {

internal/db/sandboxes.sql.go

@@ -133,6 +133,47 @@ func (q *Queries) InsertSandbox(ctx context.Context, arg InsertSandboxParams) (S
 	return i, err
 }
 
+const listActiveSandboxesByTeam = `-- name: ListActiveSandboxesByTeam :many
+SELECT id, host_id, template, status, vcpus, memory_mb, timeout_sec, guest_ip, host_ip, created_at, started_at, last_active_at, last_updated, team_id FROM sandboxes
+WHERE team_id = $1 AND status IN ('running', 'paused', 'starting')
+ORDER BY created_at DESC
+`
+
+func (q *Queries) ListActiveSandboxesByTeam(ctx context.Context, teamID string) ([]Sandbox, error) {
+	rows, err := q.db.Query(ctx, listActiveSandboxesByTeam, teamID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []Sandbox
+	for rows.Next() {
+		var i Sandbox
+		if err := rows.Scan(
+			&i.ID,
+			&i.HostID,
+			&i.Template,
+			&i.Status,
+			&i.Vcpus,
+			&i.MemoryMb,
+			&i.TimeoutSec,
+			&i.GuestIp,
+			&i.HostIp,
+			&i.CreatedAt,
+			&i.StartedAt,
+			&i.LastActiveAt,
+			&i.LastUpdated,
+			&i.TeamID,
+		); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
 const listSandboxes = `-- name: ListSandboxes :many
 SELECT id, host_id, template, status, vcpus, memory_mb, timeout_sec, guest_ip, host_ip, created_at, started_at, last_active_at, last_updated, team_id FROM sandboxes ORDER BY created_at DESC
 `

internal/db/teams.sql.go

@@ -7,10 +7,26 @@ package db
 
 import (
 	"context"
+
+	"github.com/jackc/pgx/v5/pgtype"
 )
 
+const deleteTeamMember = `-- name: DeleteTeamMember :exec
+DELETE FROM users_teams WHERE team_id = $1 AND user_id = $2
+`
+
+type DeleteTeamMemberParams struct {
+	TeamID string `json:"team_id"`
+	UserID string `json:"user_id"`
+}
+
+func (q *Queries) DeleteTeamMember(ctx context.Context, arg DeleteTeamMemberParams) error {
+	_, err := q.db.Exec(ctx, deleteTeamMember, arg.TeamID, arg.UserID)
+	return err
+}
+
 const getBYOCTeams = `-- name: GetBYOCTeams :many
-SELECT id, name, created_at, is_byoc FROM teams WHERE is_byoc = TRUE ORDER BY created_at
+SELECT id, name, created_at, is_byoc, slug, deleted_at FROM teams WHERE is_byoc = TRUE ORDER BY created_at
 `
 
 func (q *Queries) GetBYOCTeams(ctx context.Context) ([]Team, error) {
@@ -27,6 +43,8 @@ func (q *Queries) GetBYOCTeams(ctx context.Context) ([]Team, error) {
 			&i.Name,
 			&i.CreatedAt,
 			&i.IsByoc,
+			&i.Slug,
+			&i.DeletedAt,
 		); err != nil {
 			return nil, err
 		}
@@ -39,7 +57,7 @@ func (q *Queries) GetBYOCTeams(ctx context.Context) ([]Team, error) {
 }
 
 const getDefaultTeamForUser = `-- name: GetDefaultTeamForUser :one
-SELECT t.id, t.name, t.created_at, t.is_byoc FROM teams t
+SELECT t.id, t.name, t.created_at, t.is_byoc, t.slug, t.deleted_at FROM teams t
 JOIN users_teams ut ON ut.team_id = t.id
 WHERE ut.user_id = $1 AND ut.is_default = TRUE
 LIMIT 1
@@ -53,12 +71,14 @@ func (q *Queries) GetDefaultTeamForUser(ctx context.Context, userID string) (Tea
 		&i.Name,
 		&i.CreatedAt,
 		&i.IsByoc,
+		&i.Slug,
+		&i.DeletedAt,
 	)
 	return i, err
 }
 
 const getTeam = `-- name: GetTeam :one
-SELECT id, name, created_at, is_byoc FROM teams WHERE id = $1
+SELECT id, name, created_at, is_byoc, slug, deleted_at FROM teams WHERE id = $1
 `
 
 func (q *Queries) GetTeam(ctx context.Context, id string) (Team, error) {
@@ -69,10 +89,70 @@ func (q *Queries) GetTeam(ctx context.Context, id string) (Team, error) {
 		&i.Name,
 		&i.CreatedAt,
 		&i.IsByoc,
+		&i.Slug,
+		&i.DeletedAt,
 	)
 	return i, err
 }
 
+const getTeamBySlug = `-- name: GetTeamBySlug :one
+SELECT id, name, created_at, is_byoc, slug, deleted_at FROM teams WHERE slug = $1 AND deleted_at IS NULL
+`
+
+func (q *Queries) GetTeamBySlug(ctx context.Context, slug string) (Team, error) {
+	row := q.db.QueryRow(ctx, getTeamBySlug, slug)
+	var i Team
+	err := row.Scan(
+		&i.ID,
+		&i.Name,
+		&i.CreatedAt,
+		&i.IsByoc,
+		&i.Slug,
+		&i.DeletedAt,
+	)
+	return i, err
+}
+
+const getTeamMembers = `-- name: GetTeamMembers :many
+SELECT u.id, u.email, ut.role, ut.created_at AS joined_at
+FROM users_teams ut
+JOIN users u ON u.id = ut.user_id
+WHERE ut.team_id = $1
+ORDER BY ut.created_at
+`
+
+type GetTeamMembersRow struct {
+	ID       string             `json:"id"`
+	Email    string             `json:"email"`
+	Role     string             `json:"role"`
+	JoinedAt pgtype.Timestamptz `json:"joined_at"`
+}
+
+func (q *Queries) GetTeamMembers(ctx context.Context, teamID string) ([]GetTeamMembersRow, error) {
+	rows, err := q.db.Query(ctx, getTeamMembers, teamID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []GetTeamMembersRow
+	for rows.Next() {
+		var i GetTeamMembersRow
+		if err := rows.Scan(
+			&i.ID,
+			&i.Email,
+			&i.Role,
+			&i.JoinedAt,
+		); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
 const getTeamMembership = `-- name: GetTeamMembership :one
 SELECT user_id, team_id, is_default, role, created_at FROM users_teams WHERE user_id = $1 AND team_id = $2
 `
@@ -95,25 +175,74 @@ func (q *Queries) GetTeamMembership(ctx context.Context, arg GetTeamMembershipPa
 	return i, err
 }
 
+const getTeamsForUser = `-- name: GetTeamsForUser :many
+SELECT t.id, t.name, t.slug, t.is_byoc, t.created_at, t.deleted_at, ut.role
+FROM teams t
+JOIN users_teams ut ON ut.team_id = t.id
+WHERE ut.user_id = $1 AND t.deleted_at IS NULL
+ORDER BY ut.created_at
+`
+
+type GetTeamsForUserRow struct {
+	ID        string             `json:"id"`
+	Name      string             `json:"name"`
+	Slug      string             `json:"slug"`
+	IsByoc    bool               `json:"is_byoc"`
+	CreatedAt pgtype.Timestamptz `json:"created_at"`
+	DeletedAt pgtype.Timestamptz `json:"deleted_at"`
+	Role      string             `json:"role"`
+}
+
+func (q *Queries) GetTeamsForUser(ctx context.Context, userID string) ([]GetTeamsForUserRow, error) {
+	rows, err := q.db.Query(ctx, getTeamsForUser, userID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []GetTeamsForUserRow
+	for rows.Next() {
+		var i GetTeamsForUserRow
+		if err := rows.Scan(
+			&i.ID,
+			&i.Name,
+			&i.Slug,
+			&i.IsByoc,
+			&i.CreatedAt,
+			&i.DeletedAt,
+			&i.Role,
+		); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
 const insertTeam = `-- name: InsertTeam :one
-INSERT INTO teams (id, name)
+INSERT INTO teams (id, name, slug)
-VALUES ($1, $2)
+VALUES ($1, $2, $3)
-RETURNING id, name, created_at, is_byoc
+RETURNING id, name, created_at, is_byoc, slug, deleted_at
 `
 
 type InsertTeamParams struct {
 	ID   string `json:"id"`
 	Name string `json:"name"`
+	Slug string `json:"slug"`
 }
 
 func (q *Queries) InsertTeam(ctx context.Context, arg InsertTeamParams) (Team, error) {
-	row := q.db.QueryRow(ctx, insertTeam, arg.ID, arg.Name)
+	row := q.db.QueryRow(ctx, insertTeam, arg.ID, arg.Name, arg.Slug)
 	var i Team
 	err := row.Scan(
 		&i.ID,
 		&i.Name,
 		&i.CreatedAt,
 		&i.IsByoc,
+		&i.Slug,
+		&i.DeletedAt,
 	)
 	return i, err
 }
@@ -153,3 +282,41 @@ func (q *Queries) SetTeamBYOC(ctx context.Context, arg SetTeamBYOCParams) error
 	_, err := q.db.Exec(ctx, setTeamBYOC, arg.ID, arg.IsByoc)
 	return err
 }
+
+const softDeleteTeam = `-- name: SoftDeleteTeam :exec
+UPDATE teams SET deleted_at = NOW() WHERE id = $1
+`
+
+func (q *Queries) SoftDeleteTeam(ctx context.Context, id string) error {
+	_, err := q.db.Exec(ctx, softDeleteTeam, id)
+	return err
+}
+
+const updateMemberRole = `-- name: UpdateMemberRole :exec
+UPDATE users_teams SET role = $3 WHERE team_id = $1 AND user_id = $2
+`
+
+type UpdateMemberRoleParams struct {
+	TeamID string `json:"team_id"`
+	UserID string `json:"user_id"`
+	Role   string `json:"role"`
+}
+
+func (q *Queries) UpdateMemberRole(ctx context.Context, arg UpdateMemberRoleParams) error {
+	_, err := q.db.Exec(ctx, updateMemberRole, arg.TeamID, arg.UserID, arg.Role)
+	return err
+}
+
+const updateTeamName = `-- name: UpdateTeamName :exec
+UPDATE teams SET name = $2 WHERE id = $1 AND deleted_at IS NULL
+`
+
+type UpdateTeamNameParams struct {
+	ID   string `json:"id"`
+	Name string `json:"name"`
+}
+
+func (q *Queries) UpdateTeamName(ctx context.Context, arg UpdateTeamNameParams) error {
+	_, err := q.db.Exec(ctx, updateTeamName, arg.ID, arg.Name)
+	return err
+}

internal/db/users.sql.go

@@ -206,6 +206,35 @@ func (q *Queries) InsertUserOAuth(ctx context.Context, arg InsertUserOAuthParams
 	return i, err
 }
 
+const searchUsersByEmailPrefix = `-- name: SearchUsersByEmailPrefix :many
+SELECT id, email FROM users WHERE email LIKE $1 || '%' ORDER BY email LIMIT 10
+`
+
+type SearchUsersByEmailPrefixRow struct {
+	ID    string `json:"id"`
+	Email string `json:"email"`
+}
+
+func (q *Queries) SearchUsersByEmailPrefix(ctx context.Context, dollar_1 pgtype.Text) ([]SearchUsersByEmailPrefixRow, error) {
+	rows, err := q.db.Query(ctx, searchUsersByEmailPrefix, dollar_1)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []SearchUsersByEmailPrefixRow
+	for rows.Next() {
+		var i SearchUsersByEmailPrefixRow
+		if err := rows.Scan(&i.ID, &i.Email); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
 const setUserAdmin = `-- name: SetUserAdmin :exec
 UPDATE users SET is_admin = $2, updated_at = NOW() WHERE id = $1
 `

internal/id/id.go

@@ -34,6 +34,16 @@ func NewTeamID() string {
 	return "team-" + hex8()
 }
 
+// NewTeamSlug generates a unique team slug in the format "xxxxxx-yyyyyy"
+// where each part is 3 random bytes encoded as hex (6 hex chars each).
+func NewTeamSlug() string {
+	b := make([]byte, 6)
+	if _, err := rand.Read(b); err != nil {
+		panic(fmt.Sprintf("crypto/rand failed: %v", err))
+	}
+	return hex.EncodeToString(b[:3]) + "-" + hex.EncodeToString(b[3:])
+}
+
 // NewAPIKeyID generates a new API key ID in the format "key-" + 8 hex chars.
 func NewAPIKeyID() string {
 	return "key-" + hex8()

internal/service/team.go

@@ -0,0 +1,368 @@
+package service
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+	"regexp"
+	"time"
+
+	"connectrpc.com/connect"
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgtype"
+	"github.com/jackc/pgx/v5/pgxpool"
+
+	"git.omukk.dev/wrenn/sandbox/internal/db"
+	"git.omukk.dev/wrenn/sandbox/internal/id"
+	pb "git.omukk.dev/wrenn/sandbox/proto/hostagent/gen"
+	"git.omukk.dev/wrenn/sandbox/proto/hostagent/gen/hostagentv1connect"
+)
+
+var teamNameRE = regexp.MustCompile(`^[A-Za-z0-9 _\-@']{1,128}$`)
+
+// TeamService provides team management operations.
+type TeamService struct {
+	DB    *db.Queries
+	Pool  *pgxpool.Pool
+	Agent hostagentv1connect.HostAgentServiceClient
+}
+
+// TeamWithRole pairs a team with the calling user's role in it.
+type TeamWithRole struct {
+	db.Team
+	Role string `json:"role"`
+}
+
+// MemberInfo is a team member with resolved email.
+type MemberInfo struct {
+	UserID   string    `json:"user_id"`
+	Email    string    `json:"email"`
+	Role     string    `json:"role"`
+	JoinedAt time.Time `json:"joined_at"`
+}
+
+// callerRole fetches the calling user's role in the given team from DB.
+// Returns an error wrapping "forbidden" if the caller is not a member.
+func (s *TeamService) callerRole(ctx context.Context, teamID, callerUserID string) (string, error) {
+	m, err := s.DB.GetTeamMembership(ctx, db.GetTeamMembershipParams{
+		UserID: callerUserID,
+		TeamID: teamID,
+	})
+	if err != nil {
+		if err == pgx.ErrNoRows {
+			return "", fmt.Errorf("forbidden: not a member of this team")
+		}
+		return "", fmt.Errorf("get membership: %w", err)
+	}
+	return m.Role, nil
+}
+
+// requireAdmin returns an error if the caller is not an admin or owner.
+func requireAdmin(role string) error {
+	if role != "owner" && role != "admin" {
+		return fmt.Errorf("forbidden: admin or owner role required")
+	}
+	return nil
+}
+
+// GetTeam returns the team by ID. Returns an error if the team is deleted or not found.
+func (s *TeamService) GetTeam(ctx context.Context, teamID string) (db.Team, error) {
+	team, err := s.DB.GetTeam(ctx, teamID)
+	if err != nil {
+		if err == pgx.ErrNoRows {
+			return db.Team{}, fmt.Errorf("team not found")
+		}
+		return db.Team{}, fmt.Errorf("get team: %w", err)
+	}
+	if team.DeletedAt.Valid {
+		return db.Team{}, fmt.Errorf("team not found")
+	}
+	return team, nil
+}
+
+// ListTeamsForUser returns all active teams the user belongs to, with their role in each.
+func (s *TeamService) ListTeamsForUser(ctx context.Context, userID string) ([]TeamWithRole, error) {
+	rows, err := s.DB.GetTeamsForUser(ctx, userID)
+	if err != nil {
+		return nil, fmt.Errorf("list teams: %w", err)
+	}
+	result := make([]TeamWithRole, len(rows))
+	for i, r := range rows {
+		result[i] = TeamWithRole{
+			Team: db.Team{ID: r.ID, Name: r.Name, CreatedAt: r.CreatedAt, IsByoc: r.IsByoc, Slug: r.Slug, DeletedAt: r.DeletedAt},
+			Role: r.Role,
+		}
+	}
+	return result, nil
+}
+
+// CreateTeam creates a new team owned by the given user.
+func (s *TeamService) CreateTeam(ctx context.Context, ownerUserID, name string) (TeamWithRole, error) {
+	if !teamNameRE.MatchString(name) {
+		return TeamWithRole{}, fmt.Errorf("invalid team name: must be 1-128 characters, A-Z a-z 0-9 space _")
+	}
+
+	tx, err := s.Pool.Begin(ctx)
+	if err != nil {
+		return TeamWithRole{}, fmt.Errorf("begin tx: %w", err)
+	}
+	defer tx.Rollback(ctx) //nolint:errcheck
+
+	qtx := s.DB.WithTx(tx)
+
+	teamID := id.NewTeamID()
+	team, err := qtx.InsertTeam(ctx, db.InsertTeamParams{
+		ID:   teamID,
+		Name: name,
+		Slug: id.NewTeamSlug(),
+	})
+	if err != nil {
+		return TeamWithRole{}, fmt.Errorf("insert team: %w", err)
+	}
+
+	if err := qtx.InsertTeamMember(ctx, db.InsertTeamMemberParams{
+		UserID:    ownerUserID,
+		TeamID:    teamID,
+		IsDefault: false,
+		Role:      "owner",
+	}); err != nil {
+		return TeamWithRole{}, fmt.Errorf("insert owner: %w", err)
+	}
+
+	if err := tx.Commit(ctx); err != nil {
+		return TeamWithRole{}, fmt.Errorf("commit: %w", err)
+	}
+
+	return TeamWithRole{Team: team, Role: "owner"}, nil
+}
+
+// RenameTeam updates the team name. Caller must be admin or owner (verified from DB).
+func (s *TeamService) RenameTeam(ctx context.Context, teamID, callerUserID, newName string) error {
+	if !teamNameRE.MatchString(newName) {
+		return fmt.Errorf("invalid team name: must be 1-128 characters, A-Z a-z 0-9 space _")
+	}
+
+	role, err := s.callerRole(ctx, teamID, callerUserID)
+	if err != nil {
+		return err
+	}
+	if err := requireAdmin(role); err != nil {
+		return err
+	}
+
+	if err := s.DB.UpdateTeamName(ctx, db.UpdateTeamNameParams{ID: teamID, Name: newName}); err != nil {
+		return fmt.Errorf("update name: %w", err)
+	}
+	return nil
+}
+
+// DeleteTeam soft-deletes the team and destroys all running/paused/starting sandboxes.
+// Caller must be owner (verified from DB). All DB records (sandboxes, keys, templates)
+// are preserved; only the team's deleted_at is set and active VMs are stopped.
+func (s *TeamService) DeleteTeam(ctx context.Context, teamID, callerUserID string) error {
+	role, err := s.callerRole(ctx, teamID, callerUserID)
+	if err != nil {
+		return err
+	}
+	if role != "owner" {
+		return fmt.Errorf("forbidden: only the owner can delete a team")
+	}
+
+	// Collect active sandboxes and stop them.
+	sandboxes, err := s.DB.ListActiveSandboxesByTeam(ctx, teamID)
+	if err != nil {
+		return fmt.Errorf("list active sandboxes: %w", err)
+	}
+
+	var stopIDs []string
+	for _, sb := range sandboxes {
+		if _, err := s.Agent.DestroySandbox(ctx, connect.NewRequest(&pb.DestroySandboxRequest{
+			SandboxId: sb.ID,
+		})); err != nil && connect.CodeOf(err) != connect.CodeNotFound {
+			slog.Warn("team delete: failed to destroy sandbox", "sandbox_id", sb.ID, "error", err)
+		}
+		stopIDs = append(stopIDs, sb.ID)
+	}
+
+	if len(stopIDs) > 0 {
+		if err := s.DB.BulkUpdateStatusByIDs(ctx, db.BulkUpdateStatusByIDsParams{
+			Column1: stopIDs,
+			Status:  "stopped",
+		}); err != nil {
+			// Do not proceed to soft-delete if sandbox statuses couldn't be updated,
+			// as that would leave orphaned "running" records for a deleted team.
+			return fmt.Errorf("update sandbox statuses: %w", err)
+		}
+	}
+
+	if err := s.DB.SoftDeleteTeam(ctx, teamID); err != nil {
+		return fmt.Errorf("soft delete team: %w", err)
+	}
+	return nil
+}
+
+// GetMembers returns all members of the team with their emails and roles.
+func (s *TeamService) GetMembers(ctx context.Context, teamID string) ([]MemberInfo, error) {
+	rows, err := s.DB.GetTeamMembers(ctx, teamID)
+	if err != nil {
+		return nil, fmt.Errorf("get members: %w", err)
+	}
+	members := make([]MemberInfo, len(rows))
+	for i, r := range rows {
+		var joinedAt time.Time
+		if r.JoinedAt.Valid {
+			joinedAt = r.JoinedAt.Time
+		}
+		members[i] = MemberInfo{
+			UserID:   r.ID,
+			Email:    r.Email,
+			Role:     r.Role,
+			JoinedAt: joinedAt,
+		}
+	}
+	return members, nil
+}
+
+// AddMember adds an existing user (looked up by email) to the team as a member.
+// Caller must be admin or owner (verified from DB).
+func (s *TeamService) AddMember(ctx context.Context, teamID, callerUserID, email string) (MemberInfo, error) {
+	role, err := s.callerRole(ctx, teamID, callerUserID)
+	if err != nil {
+		return MemberInfo{}, err
+	}
+	if err := requireAdmin(role); err != nil {
+		return MemberInfo{}, err
+	}
+
+	target, err := s.DB.GetUserByEmail(ctx, email)
+	if err != nil {
+		if err == pgx.ErrNoRows {
+			return MemberInfo{}, fmt.Errorf("user not found: no account with that email")
+		}
+		return MemberInfo{}, fmt.Errorf("look up user: %w", err)
+	}
+
+	// Check if already a member.
+	_, memberCheckErr := s.DB.GetTeamMembership(ctx, db.GetTeamMembershipParams{
+		UserID: target.ID,
+		TeamID: teamID,
+	})
+	if memberCheckErr == nil {
+		return MemberInfo{}, fmt.Errorf("invalid: user is already a member of this team")
+	} else if memberCheckErr != pgx.ErrNoRows {
+		return MemberInfo{}, fmt.Errorf("check membership: %w", memberCheckErr)
+	}
+
+	if err := s.DB.InsertTeamMember(ctx, db.InsertTeamMemberParams{
+		UserID:    target.ID,
+		TeamID:    teamID,
+		IsDefault: false,
+		Role:      "member",
+	}); err != nil {
+		return MemberInfo{}, fmt.Errorf("insert member: %w", err)
+	}
+
+	return MemberInfo{UserID: target.ID, Email: target.Email, Role: "member"}, nil
+}
+
+// RemoveMember removes a user from the team.
+// Caller must be admin or owner (verified from DB). Owner cannot be removed.
+func (s *TeamService) RemoveMember(ctx context.Context, teamID, callerUserID, targetUserID string) error {
+	callerRole, err := s.callerRole(ctx, teamID, callerUserID)
+	if err != nil {
+		return err
+	}
+	if err := requireAdmin(callerRole); err != nil {
+		return err
+	}
+
+	targetMembership, err := s.DB.GetTeamMembership(ctx, db.GetTeamMembershipParams{
+		UserID: targetUserID,
+		TeamID: teamID,
+	})
+	if err != nil {
+		if err == pgx.ErrNoRows {
+			return fmt.Errorf("not found: user is not a member of this team")
+		}
+		return fmt.Errorf("get target membership: %w", err)
+	}
+
+	if targetMembership.Role == "owner" {
+		return fmt.Errorf("forbidden: the owner cannot be removed from the team")
+	}
+
+	if err := s.DB.DeleteTeamMember(ctx, db.DeleteTeamMemberParams{
+		TeamID: teamID,
+		UserID: targetUserID,
+	}); err != nil {
+		return fmt.Errorf("delete member: %w", err)
+	}
+	return nil
+}
+
+// UpdateMemberRole changes a member's role to admin or member.
+// Caller must be admin or owner (verified from DB). Owner's role cannot be changed.
+// Valid target roles: "admin", "member".
+func (s *TeamService) UpdateMemberRole(ctx context.Context, teamID, callerUserID, targetUserID, newRole string) error {
+	if newRole != "admin" && newRole != "member" {
+		return fmt.Errorf("invalid: role must be admin or member")
+	}
+
+	callerRole, err := s.callerRole(ctx, teamID, callerUserID)
+	if err != nil {
+		return err
+	}
+	if err := requireAdmin(callerRole); err != nil {
+		return err
+	}
+
+	targetMembership, err := s.DB.GetTeamMembership(ctx, db.GetTeamMembershipParams{
+		UserID: targetUserID,
+		TeamID: teamID,
+	})
+	if err != nil {
+		if err == pgx.ErrNoRows {
+			return fmt.Errorf("not found: user is not a member of this team")
+		}
+		return fmt.Errorf("get target membership: %w", err)
+	}
+
+	if targetMembership.Role == "owner" {
+		return fmt.Errorf("forbidden: the owner's role cannot be changed")
+	}
+
+	if err := s.DB.UpdateMemberRole(ctx, db.UpdateMemberRoleParams{
+		TeamID: teamID,
+		UserID: targetUserID,
+		Role:   newRole,
+	}); err != nil {
+		return fmt.Errorf("update role: %w", err)
+	}
+	return nil
+}
+
+// LeaveTeam removes the calling user from the team.
+// The owner cannot leave; they must delete the team instead.
+func (s *TeamService) LeaveTeam(ctx context.Context, teamID, callerUserID string) error {
+	role, err := s.callerRole(ctx, teamID, callerUserID)
+	if err != nil {
+		return err
+	}
+	if role == "owner" {
+		return fmt.Errorf("forbidden: the owner cannot leave the team; delete the team instead")
+	}
+
+	if err := s.DB.DeleteTeamMember(ctx, db.DeleteTeamMemberParams{
+		TeamID: teamID,
+		UserID: callerUserID,
+	}); err != nil {
+		return fmt.Errorf("leave team: %w", err)
+	}
+	return nil
+}
+
+// SearchUsersByEmailPrefix returns up to 10 users whose email starts with the given prefix.
+// The prefix must contain "@" to prevent broad enumeration.
+func (s *TeamService) SearchUsersByEmailPrefix(ctx context.Context, prefix string) ([]db.SearchUsersByEmailPrefixRow, error) {
+	return s.DB.SearchUsersByEmailPrefix(ctx, pgtype.Text{String: prefix, Valid: true})
+}