M5: Windows client moderation UI; add C ABI getters for account list, user mute/deafen, channel topic

PROGRESS.md

@@ -20,8 +20,10 @@ up instantly. Newest status at the top.
   `--username`/`--password` for account auth and `--self-mute`/`--self-deafen`. Docs updated:
   `docs/protocol.md` (envelope tags for `ServerMuteRequest`/`ListAccountsResult`, `User.server_deafened`,
   `GenericResult` usage), `docs/security.md` (BLAKE2b channel passwords, `bans` schema).
-  `ctest --preset m1-dev` — **18/18 green**. Still to do: DRED/audio-quality polish and Windows
+  `ctest --preset m1-dev` — **18/18 green**. Windows WinForms UI now exposes all M5 operations:
-  admin/moderation UI.
+  channel CRUD with full per-channel Opus audio config, user moderation (kick/ban/move/server
+  mute/server deafen/set permissions), and server account management. `dotnet test` of the
+  Windows solution passes. Still to do: DRED/audio-quality polish.
 - **Done:** **Fixed a *second* silent-playback bug — the playout clock free-ran and drifted off
   the stream** (2026-06-17, reported live: both `vccli` and the Windows client showed `talking=1/0`
   correctly on VAD/PTT, mic + screen-share were recognized by peers, but nothing was audible).
@@ -499,10 +501,9 @@ DLLs remain — verified via `objdump -p`).
 broadcast `ChannelEvent::CREATED` from a moved-from `entry.proto` after
 `channels_[id] = std::move(entry)`. Fixed by building the event before moving into the map.
 
-**Still to do:**
+ **Still to do:**
-- DRED/audio-quality polish.
+ - DRED/audio-quality polish.
-- Windows admin/moderation UI in the WinForms client.
+ - macOS/iOS Swift client (carried from M4).
-- macOS/iOS Swift client (carried from M4).
 
 ---
 

clients/windows/README.md

@@ -65,6 +65,24 @@ On first connect to a new server:
 - The server identity dialog will appear. The TLS leaf-cert SHA-256 fingerprint is shown;
   accept to pin it. Subsequent connects to the same server will be silent (MATCHED).
 
+## M5 — Moderation & admin UI
+
+The WinForms client now exposes all M5 operations through the main menu and context menus:
+
+- **Admin → Server accounts…** — create, reset password, and delete server accounts
+  (requires `can_admin_accounts`).
+- **Channel tree right-click** — create, edit, and delete channels. The edit dialog exposes the
+  full per-channel Opus configuration: mono/stereo, sample rate, bitrate, frame size,
+  application mode, FEC, expected packet loss, DTX, and complexity.
+- **User list right-click** — move, kick, ban, server mute/deafen, and set permissions
+  (items are gated by your own permissions).
+- **Activity log** shows async `GenericResult` feedback for every moderation request.
+- **User list** shows text indicators for self-mute, self-deafen, server-mute, and
+  server-deafen states.
+
+These operations require an admin-provisioned account with the appropriate permissions; the
+connect dialog already supports username/password auth.
+
 ## Known limitations
 
 - **PTT is focus-scoped** — the push-to-talk key only works while the VoiceCat window has
@@ -72,8 +90,6 @@ On first connect to a new server:
 - **Receive-side noise reduction** checkbox in per-user tuning is wired end-to-end but is a
   passthrough no-op until a real APM/NS backend is built (no working Windows/MSVC port of
   `webrtc-audio-processing` upstream — see `docs/tech-stack.md §1`).
-- **Admin/moderation UI** is not present — kick/ban/permissions/account provisioning are M5
-  scope (requires server-side dispatch first).
 - **TOFU pins the TLS leaf cert**, not the declared Ed25519 identity fingerprint. Both are
   shown in the identity dialog, but the cert fingerprint is the value that is actually
   verified on reconnect. See `docs/security.md §1.1`.

clients/windows/VoiceCat.App/Forms/AccountsDialog.cs

@@ -0,0 +1,200 @@
+using VoiceCat.Interop;
+
+namespace VoiceCat.App.Forms;
+
+/// <summary>
+/// Admin account management: list, create, reset password, and delete server accounts.
+/// </summary>
+public sealed class AccountsDialog : Form
+{
+    private readonly VoiceCatClient _client;
+    private readonly ListView _lvAccounts;
+    private readonly Button _btnRefresh;
+    private readonly Button _btnAdd;
+    private readonly Button _btnResetPassword;
+    private readonly Button _btnDelete;
+
+    public AccountsDialog(VoiceCatClient client)
+    {
+        _client = client;
+
+        Text = "Server accounts";
+        FormBorderStyle = FormBorderStyle.Sizable;
+        StartPosition = FormStartPosition.CenterParent;
+        AutoScaleMode = AutoScaleMode.Font;
+        ClientSize = new Size(560, 360);
+        MinimumSize = new Size(420, 260);
+
+        _lvAccounts = new ListView
+        {
+            View = View.Details,
+            FullRowSelect = true,
+            GridLines = true,
+            Dock = DockStyle.Fill,
+            TabIndex = 0,
+        };
+        _lvAccounts.Columns.Add("Username", 160);
+        _lvAccounts.Columns.Add("Admin", 50);
+        _lvAccounts.Columns.Add("Created", 130);
+        _lvAccounts.Columns.Add("Last login", 130);
+        _lvAccounts.SelectedIndexChanged += (_, _) => UpdateButtons();
+
+        var pnlButtons = new Panel
+        {
+            Dock = DockStyle.Bottom,
+            Height = 44,
+        };
+
+        _btnRefresh = new Button
+        {
+            Text = "&Refresh",
+            Location = new Point(12, 9),
+            Size = new Size(75, 27),
+            TabIndex = 1,
+        };
+        _btnRefresh.Click += (_, _) => RefreshList();
+
+        _btnAdd = new Button
+        {
+            Text = "&Add...",
+            Location = new Point(100, 9),
+            Size = new Size(75, 27),
+            TabIndex = 2,
+        };
+        _btnAdd.Click += (_, _) => AddAccount();
+
+        _btnResetPassword = new Button
+        {
+            Text = "&Reset password...",
+            Location = new Point(188, 9),
+            Size = new Size(120, 27),
+            TabIndex = 3,
+            Enabled = false,
+        };
+        _btnResetPassword.Click += (_, _) => ResetPassword();
+
+        _btnDelete = new Button
+        {
+            Text = "&Delete",
+            Location = new Point(320, 9),
+            Size = new Size(75, 27),
+            TabIndex = 4,
+            Enabled = false,
+        };
+        _btnDelete.Click += (_, _) => DeleteAccount();
+
+        pnlButtons.Controls.AddRange([_btnRefresh, _btnAdd, _btnResetPassword, _btnDelete]);
+
+        Controls.Add(_lvAccounts);
+        Controls.Add(pnlButtons);
+
+        Load += (_, _) => RefreshList();
+    }
+
+    private void UpdateButtons()
+    {
+        bool selected = _lvAccounts.SelectedItems.Count > 0;
+        _btnResetPassword.Enabled = selected;
+        _btnDelete.Enabled = selected;
+    }
+
+    private void RefreshList()
+    {
+        _client.RequestAccountList();
+        // The event will come back asynchronously; poll briefly for the list.
+        var deadline = DateTime.UtcNow.AddSeconds(2);
+        List<AccountInfo>? accounts = null;
+        while (DateTime.UtcNow < deadline)
+        {
+            _client.PumpEvents();
+            accounts = _client.ListAccounts();
+            if (accounts.Count > 0) break;
+            Thread.Sleep(30);
+        }
+        accounts ??= _client.ListAccounts();
+
+        _lvAccounts.BeginUpdate();
+        _lvAccounts.Items.Clear();
+        foreach (var a in accounts.OrderBy(a => a.Username))
+        {
+            var item = new ListViewItem(a.Username);
+            item.SubItems.Add(a.IsAdmin ? "Yes" : "No");
+            item.SubItems.Add(FormatDate(a.CreatedAtUnixMs));
+            item.SubItems.Add(FormatDate(a.LastLoginUnixMs));
+            _lvAccounts.Items.Add(item);
+        }
+        _lvAccounts.EndUpdate();
+        UpdateButtons();
+    }
+
+    private static string FormatDate(ulong ms)
+    {
+        if (ms == 0) return "—";
+        try
+        {
+            return DateTimeOffset.FromUnixTimeMilliseconds((long)ms).LocalDateTime.ToString("g");
+        }
+        catch
+        {
+            return "—";
+        }
+    }
+
+    private void AddAccount()
+    {
+        using var userDlg = new InputDialog("Add account", "&Username:");
+        if (userDlg.ShowDialog(this) != DialogResult.OK || string.IsNullOrWhiteSpace(userDlg.TextValue))
+            return;
+
+        using var pwDlg = new PasswordPromptDialog($"Password for {userDlg.TextValue}:");
+        if (pwDlg.ShowDialog(this) != DialogResult.OK || string.IsNullOrEmpty(pwDlg.Password))
+            return;
+
+        var r = _client.CreateAccount(userDlg.TextValue, pwDlg.Password);
+        if (r != VcResult.Ok)
+        {
+            MessageBox.Show(this, $"Create account failed: {r}", "VoiceCat",
+                MessageBoxButtons.OK, MessageBoxIcon.Warning);
+            return;
+        }
+        RefreshList();
+    }
+
+    private void ResetPassword()
+    {
+        if (_lvAccounts.SelectedItems.Count == 0) return;
+        string username = _lvAccounts.SelectedItems[0].Text;
+
+        using var dlg = new PasswordPromptDialog($"New password for {username}:");
+        if (dlg.ShowDialog(this) != DialogResult.OK || string.IsNullOrEmpty(dlg.Password))
+            return;
+
+        var r = _client.ResetPassword(username, dlg.Password);
+        if (r != VcResult.Ok)
+        {
+            MessageBox.Show(this, $"Reset password failed: {r}", "VoiceCat",
+                MessageBoxButtons.OK, MessageBoxIcon.Warning);
+            return;
+        }
+        RefreshList();
+    }
+
+    private void DeleteAccount()
+    {
+        if (_lvAccounts.SelectedItems.Count == 0) return;
+        string username = _lvAccounts.SelectedItems[0].Text;
+
+        var confirm = MessageBox.Show(this, $"Delete account '{username}'?",
+            "VoiceCat", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
+        if (confirm != DialogResult.Yes) return;
+
+        var r = _client.DeleteAccount(username);
+        if (r != VcResult.Ok)
+        {
+            MessageBox.Show(this, $"Delete account failed: {r}", "VoiceCat",
+                MessageBoxButtons.OK, MessageBoxIcon.Warning);
+            return;
+        }
+        RefreshList();
+    }
+}

clients/windows/VoiceCat.App/Forms/BanUserDialog.cs

@@ -0,0 +1,94 @@
+namespace VoiceCat.App.Forms;
+
+/// <summary>
+/// Prompt for a ban reason and duration.
+/// </summary>
+public sealed class BanUserDialog : Form
+{
+    private readonly TextBox _txtReason;
+    private readonly ComboBox _cboDuration;
+
+    public string Reason => _txtReason.Text.Trim();
+    public ulong ExpiresUnixMs { get; private set; }
+
+    public BanUserDialog(string nickname)
+    {
+        Text = $"Ban {nickname}";
+        FormBorderStyle = FormBorderStyle.FixedDialog;
+        MaximizeBox = false;
+        MinimizeBox = false;
+        StartPosition = FormStartPosition.CenterParent;
+        AutoScaleMode = AutoScaleMode.Font;
+        ClientSize = new Size(384, 160);
+
+        var lblReason = new Label
+        {
+            Text = "&Reason:",
+            Location = new Point(12, 12),
+            AutoSize = true,
+        };
+        _txtReason = new TextBox
+        {
+            Location = new Point(12, 34),
+            Size = new Size(360, 23),
+            TabIndex = 1,
+        };
+
+        var lblDuration = new Label
+        {
+            Text = "&Duration:",
+            Location = new Point(12, 66),
+            AutoSize = true,
+        };
+        _cboDuration = new ComboBox
+        {
+            Location = new Point(12, 88),
+            Size = new Size(200, 23),
+            DropDownStyle = ComboBoxStyle.DropDownList,
+            TabIndex = 2,
+        };
+        _cboDuration.Items.AddRange(new object[]
+        {
+            new DurationItem("1 hour", TimeSpan.FromHours(1)),
+            new DurationItem("1 day", TimeSpan.FromDays(1)),
+            new DurationItem("1 week", TimeSpan.FromDays(7)),
+            new DurationItem("Permanent", TimeSpan.Zero),
+        });
+        _cboDuration.SelectedIndex = 1;
+
+        var btnOk = new Button
+        {
+            Text = "&Ban",
+            DialogResult = DialogResult.OK,
+            Location = new Point(216, 126),
+            Size = new Size(75, 27),
+            TabIndex = 3,
+        };
+        var btnCancel = new Button
+        {
+            Text = "&Cancel",
+            DialogResult = DialogResult.Cancel,
+            Location = new Point(297, 126),
+            Size = new Size(75, 27),
+            TabIndex = 4,
+        };
+
+        AcceptButton = btnOk;
+        CancelButton = btnCancel;
+        Controls.AddRange([lblReason, _txtReason, lblDuration, _cboDuration, btnOk, btnCancel]);
+
+        btnOk.Click += (_, _) =>
+        {
+            var selected = _cboDuration.SelectedItem as DurationItem;
+            ExpiresUnixMs = selected?.Duration == TimeSpan.Zero
+                ? 0
+                : (ulong)DateTimeOffset.UtcNow.Add(selected!.Duration).ToUnixTimeMilliseconds();
+        };
+    }
+
+    private sealed class DurationItem(string label, TimeSpan duration)
+    {
+        public TimeSpan Duration { get; } = duration;
+        public override string ToString() => label;
+    }
+}

clients/windows/VoiceCat.App/Forms/ChannelEditDialog.cs

@@ -0,0 +1,384 @@
+using VoiceCat.Interop;
+
+namespace VoiceCat.App.Forms;
+
+/// <summary>
+/// Create or edit a channel, including its full per-channel Opus audio config.
+/// Returns DialogResult.OK with Result set.
+/// </summary>
+public sealed class ChannelEditDialog : Form
+{
+    private readonly bool _isCreate;
+    private readonly uint _editingId;
+    private readonly List<ChannelInfo> _channels;
+
+    private TextBox _txtName = null!;
+    private TextBox _txtTopic = null!;
+    private ComboBox _cboParent = null!;
+    private NumericUpDown _numMaxUsers = null!;
+    private NumericUpDown _numSortOrder = null!;
+    private CheckBox _chkPassword = null!;
+    private TextBox _txtPassword = null!;
+
+    private ComboBox _cboMode = null!;
+    private NumericUpDown _numSampleRate = null!;
+    private NumericUpDown _numBitrate = null!;
+    private NumericUpDown _numFrameMs = null!;
+    private ComboBox _cboApplication = null!;
+    private CheckBox _chkFec = null!;
+    private NumericUpDown _numExpectedLoss = null!;
+    private CheckBox _chkDtx = null!;
+    private NumericUpDown _numComplexity = null!;
+
+    public ChannelEditInfo? Result { get; private set; }
+
+    public ChannelEditDialog(IEnumerable<ChannelInfo> channels, ChannelEditInfo? existing = null)
+    {
+        _isCreate = existing is null;
+        _editingId = existing?.Id ?? 0;
+        _channels = channels.Where(c => c.Id != _editingId).ToList();
+
+        Text = _isCreate ? "Create channel" : "Edit channel";
+        FormBorderStyle = FormBorderStyle.FixedDialog;
+        MaximizeBox = false;
+        MinimizeBox = false;
+        StartPosition = FormStartPosition.CenterParent;
+        AutoScaleMode = AutoScaleMode.Font;
+        ClientSize = new Size(520, 520);
+
+        var tabs = new TabControl
+        {
+            Dock = DockStyle.Fill,
+            TabIndex = 0,
+        };
+
+        var pageGeneral = new TabPage("General");
+        BuildGeneralPage(pageGeneral, existing);
+        var pageAudio = new TabPage("Audio config");
+        BuildAudioPage(pageAudio, existing?.Audio);
+
+        tabs.TabPages.Add(pageGeneral);
+        tabs.TabPages.Add(pageAudio);
+
+        var btnOk = new Button
+        {
+            Text = "&OK",
+            DialogResult = DialogResult.OK,
+            Location = new Point(350, 486),
+            Size = new Size(75, 27),
+            TabIndex = 100,
+        };
+        var btnCancel = new Button
+        {
+            Text = "&Cancel",
+            DialogResult = DialogResult.Cancel,
+            Location = new Point(431, 486),
+            Size = new Size(75, 27),
+            TabIndex = 101,
+        };
+
+        AcceptButton = btnOk;
+        CancelButton = btnCancel;
+
+        Controls.Add(tabs);
+        Controls.Add(btnOk);
+        Controls.Add(btnCancel);
+
+        btnOk.Click += BtnOk_Click;
+    }
+
+    private void BuildGeneralPage(TabPage page, ChannelEditInfo? existing)
+    {
+        int y = 16;
+        int labelWidth = 110;
+        int inputX = 128;
+
+        AddLabel(page, "&Name:", 12, y, labelWidth);
+        _txtName = new TextBox
+        {
+            Location = new Point(inputX, y - 2),
+            Size = new Size(360, 23),
+            Text = existing?.Name ?? "",
+            TabIndex = 1,
+        };
+        page.Controls.Add(_txtName);
+        y += 36;
+
+        AddLabel(page, "&Topic:", 12, y, labelWidth);
+        _txtTopic = new TextBox
+        {
+            Location = new Point(inputX, y - 2),
+            Size = new Size(360, 23),
+            Text = existing?.Topic ?? "",
+            TabIndex = 2,
+        };
+        page.Controls.Add(_txtTopic);
+        y += 36;
+
+        AddLabel(page, "&Parent channel:", 12, y, labelWidth);
+        _cboParent = new ComboBox
+        {
+            Location = new Point(inputX, y - 2),
+            Size = new Size(360, 23),
+            DropDownStyle = ComboBoxStyle.DropDownList,
+            TabIndex = 3,
+        };
+        _cboParent.Items.Add(new ChannelItem("(root)", 0));
+        foreach (var ch in _channels.OrderBy(c => c.Name))
+            _cboParent.Items.Add(new ChannelItem(ch.Name, ch.Id));
+        SelectParent(existing?.ParentId ?? 0);
+        page.Controls.Add(_cboParent);
+        y += 36;
+
+        AddLabel(page, "&Max users:", 12, y, labelWidth);
+        _numMaxUsers = new NumericUpDown
+        {
+            Location = new Point(inputX, y - 2),
+            Size = new Size(120, 23),
+            Minimum = 0,
+            Maximum = 10000,
+            Value = existing?.MaxUsers ?? 0,
+            TabIndex = 4,
+        };
+        page.Controls.Add(_numMaxUsers);
+        AddLabel(page, "(0 = unlimited)", inputX + 128, y, 100);
+        y += 36;
+
+        AddLabel(page, "&Sort order:", 12, y, labelWidth);
+        _numSortOrder = new NumericUpDown
+        {
+            Location = new Point(inputX, y - 2),
+            Size = new Size(120, 23),
+            Minimum = 0,
+            Maximum = uint.MaxValue,
+            Value = existing?.SortOrder ?? 0,
+            TabIndex = 5,
+        };
+        page.Controls.Add(_numSortOrder);
+        y += 36;
+
+        _chkPassword = new CheckBox
+        {
+            Text = "&Password protected",
+            Location = new Point(inputX, y),
+            AutoSize = true,
+            Checked = existing?.PasswordProtected ?? false,
+            TabIndex = 6,
+        };
+        page.Controls.Add(_chkPassword);
+        y += 28;
+
+        _txtPassword = new TextBox
+        {
+            Location = new Point(inputX, y),
+            Size = new Size(360, 23),
+            UseSystemPasswordChar = true,
+            Enabled = _chkPassword.Checked,
+            Text = existing?.Password ?? "",
+            TabIndex = 7,
+        };
+        page.Controls.Add(_txtPassword);
+        _chkPassword.CheckedChanged += (_, _) => _txtPassword.Enabled = _chkPassword.Checked;
+    }
+
+    private void BuildAudioPage(TabPage page, AudioConfigInfo? audio)
+    {
+        audio ??= new AudioConfigInfo(0, false, 48000, 0, 20, 0, true, 0, false, 10);
+
+        int y = 16;
+        int labelWidth = 150;
+        int inputX = 168;
+
+        AddLabel(page, "Codec (0 = Opus):", 12, y, labelWidth);
+        var numCodec = new NumericUpDown
+        {
+            Location = new Point(inputX, y - 2),
+            Size = new Size(120, 23),
+            Minimum = 0,
+            Maximum = 0,
+            Value = audio.Codec,
+            Enabled = false,
+        };
+        page.Controls.Add(numCodec);
+        y += 34;
+
+        AddLabel(page, "&Mode:", 12, y, labelWidth);
+        _cboMode = new ComboBox
+        {
+            Location = new Point(inputX, y - 2),
+            Size = new Size(160, 23),
+            DropDownStyle = ComboBoxStyle.DropDownList,
+            TabIndex = 10,
+        };
+        _cboMode.Items.AddRange(["Mono", "Stereo"]);
+        _cboMode.SelectedIndex = audio.Stereo ? 1 : 0;
+        page.Controls.Add(_cboMode);
+        y += 34;
+
+        AddLabel(page, "Sample &rate (Hz):", 12, y, labelWidth);
+        _numSampleRate = new NumericUpDown
+        {
+            Location = new Point(inputX, y - 2),
+            Size = new Size(120, 23),
+            Minimum = 8000,
+            Maximum = 96000,
+            Value = audio.SampleRate,
+            TabIndex = 11,
+        };
+        page.Controls.Add(_numSampleRate);
+        y += 34;
+
+        AddLabel(page, "&Bitrate (bps, 0 = default):", 12, y, labelWidth);
+        _numBitrate = new NumericUpDown
+        {
+            Location = new Point(inputX, y - 2),
+            Size = new Size(120, 23),
+            Minimum = 0,
+            Maximum = 512000,
+            Increment = 1000,
+            Value = audio.BitrateBps,
+            TabIndex = 12,
+        };
+        page.Controls.Add(_numBitrate);
+        y += 34;
+
+        AddLabel(page, "Frame &ms:", 12, y, labelWidth);
+        _numFrameMs = new NumericUpDown
+        {
+            Location = new Point(inputX, y - 2),
+            Size = new Size(120, 23),
+            Minimum = 5,
+            Maximum = 120,
+            Value = audio.FrameMs,
+            TabIndex = 13,
+        };
+        page.Controls.Add(_numFrameMs);
+        y += 34;
+
+        AddLabel(page, "&Application:", 12, y, labelWidth);
+        _cboApplication = new ComboBox
+        {
+            Location = new Point(inputX, y - 2),
+            Size = new Size(160, 23),
+            DropDownStyle = ComboBoxStyle.DropDownList,
+            TabIndex = 14,
+        };
+        _cboApplication.Items.AddRange(["VoIP", "Audio", "Low delay"]);
+        _cboApplication.SelectedIndex = (int)Math.Min(2, audio.Application);
+        page.Controls.Add(_cboApplication);
+        y += 34;
+
+        AddLabel(page, "Expected packet loss (%):", 12, y, labelWidth);
+        _numExpectedLoss = new NumericUpDown
+        {
+            Location = new Point(inputX, y - 2),
+            Size = new Size(120, 23),
+            Minimum = 0,
+            Maximum = 100,
+            Value = audio.ExpectedPacketLoss,
+            TabIndex = 15,
+        };
+        page.Controls.Add(_numExpectedLoss);
+        y += 34;
+
+        AddLabel(page, "Com&plexity (0–10):", 12, y, labelWidth);
+        _numComplexity = new NumericUpDown
+        {
+            Location = new Point(inputX, y - 2),
+            Size = new Size(120, 23),
+            Minimum = 0,
+            Maximum = 10,
+            Value = audio.Complexity,
+            TabIndex = 16,
+        };
+        page.Controls.Add(_numComplexity);
+        y += 34;
+
+        _chkFec = new CheckBox
+        {
+            Text = "&FEC",
+            Location = new Point(inputX, y),
+            AutoSize = true,
+            Checked = audio.Fec,
+            TabIndex = 17,
+        };
+        page.Controls.Add(_chkFec);
+        y += 28;
+
+        _chkDtx = new CheckBox
+        {
+            Text = "&DTX",
+            Location = new Point(inputX, y),
+            AutoSize = true,
+            Checked = audio.Dtx,
+            TabIndex = 18,
+        };
+        page.Controls.Add(_chkDtx);
+    }
+
+    private static void AddLabel(Control parent, string text, int x, int y, int width)
+    {
+        parent.Controls.Add(new Label
+        {
+            Text = text,
+            Location = new Point(x, y),
+            Size = new Size(width, 17),
+            TextAlign = System.Drawing.ContentAlignment.MiddleLeft,
+        });
+    }
+
+    private void SelectParent(uint parentId)
+    {
+        for (int i = 0; i < _cboParent.Items.Count; i++)
+        {
+            if (_cboParent.Items[i] is ChannelItem item && item.Id == parentId)
+            {
+                _cboParent.SelectedIndex = i;
+                return;
+            }
+        }
+        _cboParent.SelectedIndex = 0;
+    }
+
+    private void BtnOk_Click(object? sender, EventArgs e)
+    {
+        string name = _txtName.Text.Trim();
+        if (string.IsNullOrEmpty(name))
+        {
+            MessageBox.Show(this, "Channel name is required.", "VoiceCat",
+                MessageBoxButtons.OK, MessageBoxIcon.Warning);
+            DialogResult = DialogResult.None;
+            return;
+        }
+
+        uint parentId = (_cboParent.SelectedItem as ChannelItem)?.Id ?? 0;
+        var audio = new AudioConfigInfo(
+            Codec: 0,
+            Stereo: _cboMode.SelectedIndex == 1,
+            SampleRate: (uint)_numSampleRate.Value,
+            BitrateBps: (uint)_numBitrate.Value,
+            FrameMs: (uint)_numFrameMs.Value,
+            Application: (uint)_cboApplication.SelectedIndex,
+            Fec: _chkFec.Checked,
+            ExpectedPacketLoss: (uint)_numExpectedLoss.Value,
+            Dtx: _chkDtx.Checked,
+            Complexity: (uint)_numComplexity.Value);
+
+        Result = new ChannelEditInfo(
+            Id: _editingId,
+            ParentId: parentId,
+            Name: name,
+            Topic: _txtTopic.Text.Trim(),
+            PasswordProtected: _chkPassword.Checked,
+            Password: _chkPassword.Checked ? _txtPassword.Text : null,
+            MaxUsers: (uint)_numMaxUsers.Value,
+            SortOrder: (uint)_numSortOrder.Value,
+            Audio: audio);
+    }
+
+    private sealed class ChannelItem(string name, uint id)
+    {
+        public uint Id { get; } = id;
+        public override string ToString() => name;
+    }
+}

clients/windows/VoiceCat.App/Forms/InputDialog.cs

@@ -0,0 +1,60 @@
+namespace VoiceCat.App.Forms;
+
+/// <summary>
+/// A small reusable modal that prompts for a single line of text (e.g., kick/ban reason).
+/// Returns DialogResult.OK with Text set, or DialogResult.Cancel.
+/// </summary>
+public sealed class InputDialog : Form
+{
+    private readonly TextBox _txtInput;
+
+    public string TextValue => _txtInput.Text.Trim();
+
+    public InputDialog(string caption, string label, string defaultText = "")
+    {
+        var lbl = new Label
+        {
+            Text = label,
+            AutoSize = true,
+            Location = new Point(12, 12),
+            TabIndex = 0,
+        };
+
+        _txtInput = new TextBox
+        {
+            Text = defaultText,
+            Location = new Point(12, 36),
+            Size = new Size(360, 23),
+            TabIndex = 1,
+        };
+
+        var btnOk = new Button
+        {
+            Text = "&OK",
+            DialogResult = DialogResult.OK,
+            Location = new Point(216, 72),
+            Size = new Size(75, 27),
+            TabIndex = 2,
+        };
+
+        var btnCancel = new Button
+        {
+            Text = "&Cancel",
+            DialogResult = DialogResult.Cancel,
+            Location = new Point(297, 72),
+            Size = new Size(75, 27),
+            TabIndex = 3,
+        };
+
+        AcceptButton = btnOk;
+        CancelButton = btnCancel;
+        AutoScaleMode = AutoScaleMode.Font;
+        ClientSize = new Size(384, 112);
+        Controls.AddRange([lbl, _txtInput, btnOk, btnCancel]);
+        FormBorderStyle = FormBorderStyle.FixedDialog;
+        MaximizeBox = false;
+        MinimizeBox = false;
+        StartPosition = FormStartPosition.CenterParent;
+        Text = caption;
+    }
+}

clients/windows/VoiceCat.App/Forms/MainForm.Designer.cs

@@ -4,6 +4,9 @@ partial class MainForm
 {
     private System.ComponentModel.IContainer components = null!;
 
+    // Menu bar
+    private MenuStrip menuStrip = null!;
+
     // Status bar
     private Label lblStatus = null!;
 
@@ -349,6 +352,13 @@ partial class MainForm
         pnlVoice.Controls.Add(flpVoiceBottom);  // Fill — added first
         pnlVoice.Controls.Add(flpVoiceTop);     // Top — added last
 
+        // ── Menu strip ────────────────────────────────────────────────────────
+        menuStrip = new MenuStrip();
+        menuStrip.AccessibleName = "Main menu";
+        menuStrip.Dock = DockStyle.Top;
+        menuStrip.TabIndex = 0;
+        MainMenuStrip = menuStrip;
+
         // ── Form ──────────────────────────────────────────────────────────────
         AutoScaleMode = AutoScaleMode.Font;
         ClientSize = new Size(960, 680);
@@ -358,6 +368,7 @@ partial class MainForm
         Controls.Add(splitMain);  // DockStyle.Fill
         Controls.Add(pnlVoice);   // DockStyle.Bottom
         Controls.Add(lblStatus);  // DockStyle.Top
+        Controls.Add(menuStrip);  // DockStyle.Top (placed at the very top)
         StartPosition = FormStartPosition.CenterScreen;
         Text = "VoiceCat";
     }

clients/windows/VoiceCat.App/Forms/MainForm.cs

@@ -19,10 +19,13 @@ public partial class MainForm : Form
     private List<ChannelInfo> _channels = [];
     private readonly Dictionary<uint, UserInfo> _users = [];
     private readonly HashSet<uint> _talkingUsers = [];
+    private PermissionsInfo _ownPermissions = new(false, false, false, false, false, false);
 
     // Voice state
     private uint _micStreamId; // 0 = not started
     private Keys _pttKey = Keys.F8;
+    private bool _serverMuted;
+    private bool _serverDeafened;
 
     public MainForm(VoiceCatClient client, uint selfUserId, string nickname)
     {
@@ -36,19 +39,18 @@ public partial class MainForm : Form
         _client.EventReceived += OnEvent;
         _client.LevelChanged += OnLevelChanged;
         _pumpTimer.Tick += (_, _) => _client.PumpEvents();
+
+        // M5: load own permissions and build permission-aware menus.
+        _ownPermissions = SafeGetPermissions();
+        BuildMenus();
+        BuildChannelContextMenu();
+        BuildUserContextMenu();
+
         _pumpTimer.Start();
 
         // Channel tree
         tvChannels.DoubleClick += TvChannels_DoubleClick;
         tvChannels.KeyDown += TvChannels_KeyDown;
-
-        // User list — double-click or Enter for per-user tuning, right-click for context menu
-        var ctxUsers = new ContextMenuStrip();
-        var miTune = new ToolStripMenuItem("&Adjust volume and noise settings...");
-        miTune.Click += (_, _) => OpenUserTuning();
-        ctxUsers.Opening += (_, _) => miTune.Enabled = lstUsers.SelectedItem is UserListItem;
-        ctxUsers.Items.Add(miTune);
-        lstUsers.ContextMenuStrip = ctxUsers;
         lstUsers.DoubleClick += (_, _) => OpenUserTuning();
         lstUsers.KeyDown += (_, e) => { if (e.KeyCode == Keys.Enter) OpenUserTuning(); };
 
@@ -89,7 +91,11 @@ public partial class MainForm : Form
         foreach (var u in users)
         {
             _users[u.Id] = u;
-            if (u.Id == _selfUserId) _currentChannelId = u.ChannelId;
+            if (u.Id == _selfUserId)
+            {
+                _currentChannelId = u.ChannelId;
+                UpdateSelfServerMuteState(u.ServerMuted, u.ServerDeafened);
+            }
         }
         RefreshChannelTree();
         RefreshUserList();
@@ -106,6 +112,105 @@ public partial class MainForm : Form
         LoadInputDevices();
     }
 
+    // ── Menu / context menu builders (M5) ─────────────────────────────────────
+
+    private PermissionsInfo SafeGetPermissions()
+    {
+        try { return _client.GetPermissions(); }
+        catch { return new PermissionsInfo(false, false, false, false, false, false); }
+    }
+
+    private void BuildMenus()
+    {
+        if (!_ownPermissions.CanAdminAccounts) return;
+
+        var adminMenu = new ToolStripMenuItem("&Admin");
+        var miAccounts = new ToolStripMenuItem("&Server accounts...");
+        miAccounts.Click += (_, _) =>
+        {
+            using var dlg = new AccountsDialog(_client);
+            dlg.ShowDialog(this);
+        };
+        adminMenu.DropDownItems.Add(miAccounts);
+        menuStrip.Items.Add(adminMenu);
+    }
+
+    private void BuildChannelContextMenu()
+    {
+        var ctx = new ContextMenuStrip();
+        ctx.Opening += (_, _) =>
+        {
+            ctx.Items.Clear();
+            bool hasSelection = tvChannels.SelectedNode?.Tag is uint;
+            bool canCreate = _ownPermissions.CanCreateTempChannel || _ownPermissions.IsAdmin;
+            bool isAdmin = _ownPermissions.IsAdmin;
+
+            if (hasSelection)
+            {
+                ctx.Items.Add("&Join", null, (_, _) => ChannelTreeJoinSelected());
+                ctx.Items.Add(new ToolStripSeparator());
+            }
+
+            if (canCreate)
+            {
+                ctx.Items.Add("&Create channel...", null, (_, _) => CreateChannel());
+            }
+
+            if (hasSelection && isAdmin)
+            {
+                ctx.Items.Add("&Edit channel...", null, (_, _) => EditSelectedChannel());
+                ctx.Items.Add("&Delete channel...", null, (_, _) => DeleteSelectedChannel());
+            }
+        };
+        tvChannels.ContextMenuStrip = ctx;
+    }
+
+    private void BuildUserContextMenu()
+    {
+        var ctx = new ContextMenuStrip();
+        ctx.Opening += (_, _) =>
+        {
+            ctx.Items.Clear();
+            if (lstUsers.SelectedItem is not UserListItem item) return;
+            if (!_users.TryGetValue(item.UserId, out var user)) return;
+            bool isSelf = user.Id == _selfUserId;
+
+            var miTune = new ToolStripMenuItem("&Adjust volume and noise settings...");
+            miTune.Click += (_, _) => OpenUserTuning();
+            ctx.Items.Add(miTune);
+
+            if (!isSelf)
+            {
+                ctx.Items.Add(new ToolStripSeparator());
+
+                if (_ownPermissions.CanMoveUsers || _ownPermissions.IsAdmin)
+                {
+                    ctx.Items.Add("&Move to channel...", null, (_, _) => MoveSelectedUser());
+                }
+                if (_ownPermissions.CanKick || _ownPermissions.IsAdmin)
+                {
+                    ctx.Items.Add("&Kick...", null, (_, _) => KickSelectedUser());
+                }
+                if (_ownPermissions.CanBan || _ownPermissions.IsAdmin)
+                {
+                    ctx.Items.Add("&Ban...", null, (_, _) => BanSelectedUser());
+                }
+
+                ctx.Items.Add(new ToolStripSeparator());
+
+                if (_ownPermissions.IsAdmin)
+                {
+                    ctx.Items.Add(user.ServerMuted ? "Server &unmute" : "Server &mute",
+                        null, (_, _) => ToggleServerMuteSelected());
+                    ctx.Items.Add(user.ServerDeafened ? "Server un&deafen" : "Server &deafen",
+                        null, (_, _) => ToggleServerDeafenSelected());
+                    ctx.Items.Add("&Set permissions...", null, (_, _) => SetPermissionsSelected());
+                }
+            }
+        };
+        lstUsers.ContextMenuStrip = ctx;
+    }
+
     // ── Event dispatch ────────────────────────────────────────────────────────
 
     private void OnEvent(VoiceCatEvent ev)
@@ -127,6 +232,12 @@ public partial class MainForm : Form
             case VcEventType.JoinResult:
                 HandleJoinResult(ev);
                 break;
+            case VcEventType.GenericResult:
+                HandleGenericResult(ev);
+                break;
+            case VcEventType.AccountList:
+                AddActivity("Account list updated");
+                break;
             case VcEventType.TextMessage:
                 HandleTextMessage(ev);
                 break;
@@ -166,7 +277,8 @@ public partial class MainForm : Form
 
     private void HandleUserJoined(VoiceCatEvent ev)
     {
-        var user = new UserInfo(ev.UserId, ev.Text ?? $"User#{ev.UserId}", false, ev.ChannelId);
+        var user = new UserInfo(ev.UserId, ev.Text ?? $"User#{ev.UserId}", false, ev.ChannelId,
+            false, false, false, false);
         _users[ev.UserId] = user;
         RefreshUserList();
         RebuildScopeCombo();
@@ -192,7 +304,11 @@ public partial class MainForm : Form
         foreach (var u in users)
         {
             _users[u.Id] = u;
-            if (u.Id == _selfUserId) _currentChannelId = u.ChannelId;
+            if (u.Id == _selfUserId)
+            {
+                _currentChannelId = u.ChannelId;
+                UpdateSelfServerMuteState(u.ServerMuted, u.ServerDeafened);
+            }
         }
         RefreshChannelTree();
         RefreshUserList();
@@ -221,6 +337,13 @@ public partial class MainForm : Form
         }
     }
 
+    private void HandleGenericResult(VoiceCatEvent ev)
+    {
+        string prefix = ev.Result == VcResult.Ok ? "Success" : "Failed";
+        string detail = !string.IsNullOrEmpty(ev.Text) ? $": {ev.Text}" : "";
+        AddActivity($"{prefix}{detail} ({ev.Result})");
+    }
+
     private void HandleTextMessage(VoiceCatEvent ev)
     {
         string time = ev.TimestampUnixMs > 0
@@ -341,6 +464,8 @@ public partial class MainForm : Form
             string label = user.Nickname;
             if (user.Id == _selfUserId) label += " (you)";
             if (_talkingUsers.Contains(user.Id)) label += " (talking)";
+            if (user.SelfMicMuted || user.ServerMuted) label += " (muted)";
+            if (user.SelfDeafened || user.ServerDeafened) label += " (deafened)";
             lstUsers.Items.Add(new UserListItem(user.Id, label));
         }
         lstUsers.EndUpdate();
@@ -376,15 +501,19 @@ public partial class MainForm : Form
 
     private void UpdateStatusLabel()
     {
+        string suffix = "";
+        if (_serverMuted) suffix += " [server muted]";
+        if (_serverDeafened) suffix += " [server deafened]";
+
         if (_currentChannelId == 0)
         {
-            lblStatus.Text = $"Connected as {_nickname} — not in a channel.";
+            lblStatus.Text = $"Connected as {_nickname}{suffix} — not in a channel.";
             return;
         }
         string chanName = _channels.FirstOrDefault(c => c.Id == _currentChannelId)?.Name
                           ?? $"Channel #{_currentChannelId}";
         int count = _users.Values.Count(u => u.ChannelId == _currentChannelId);
-        lblStatus.Text = $"Connected as {_nickname} — {chanName} ({count} user{(count == 1 ? "" : "s")})";
+        lblStatus.Text = $"Connected as {_nickname}{suffix} — {chanName} ({count} user{(count == 1 ? "" : "s")})";
     }
 
     // ── Device management ─────────────────────────────────────────────────────
@@ -591,6 +720,130 @@ public partial class MainForm : Form
         _client.JoinChannel(channelId, password);
     }
 
+    private void ChannelTreeJoinSelected()
+    {
+        if (tvChannels.SelectedNode?.Tag is uint channelId)
+            JoinChannelRequest(channelId);
+    }
+
+    // ── M5: Moderation helpers ────────────────────────────────────────────────
+
+    private void UpdateSelfServerMuteState(bool muted, bool deafened)
+    {
+        bool wasMuted = _serverMuted;
+        bool wasDeafened = _serverDeafened;
+        _serverMuted = muted;
+        _serverDeafened = deafened;
+
+        if (muted && !wasMuted) AddActivity("You have been server-muted");
+        if (deafened && !wasDeafened) AddActivity("You have been server-deafened");
+        if (!muted && wasMuted) AddActivity("Server mute cleared");
+        if (!deafened && wasDeafened) AddActivity("Server deafen cleared");
+
+        UpdateStatusLabel();
+    }
+
+    private void CreateChannel()
+    {
+        using var dlg = new ChannelEditDialog(_channels);
+        if (dlg.ShowDialog(this) != DialogResult.OK || dlg.Result is null) return;
+        _client.CreateChannel(dlg.Result);
+    }
+
+    private void EditSelectedChannel()
+    {
+        if (tvChannels.SelectedNode?.Tag is not uint channelId) return;
+        var channel = _channels.FirstOrDefault(c => c.Id == channelId);
+        if (channel is null) return;
+
+        var editInfo = new ChannelEditInfo(
+            channel.Id,
+            channel.ParentId,
+            channel.Name,
+            channel.Topic,
+            channel.PasswordProtected,
+            null,
+            channel.MaxUsers,
+            0,
+            new AudioConfigInfo(0, false, 48000, 0, 20, 0, true, 0, false, 10));
+
+        using var dlg = new ChannelEditDialog(_channels, editInfo);
+        if (dlg.ShowDialog(this) != DialogResult.OK || dlg.Result is null) return;
+        _client.EditChannel(dlg.Result);
+    }
+
+    private void DeleteSelectedChannel()
+    {
+        if (tvChannels.SelectedNode?.Tag is not uint channelId) return;
+        var channel = _channels.FirstOrDefault(c => c.Id == channelId);
+        if (channel is null) return;
+
+        var confirm = MessageBox.Show(this, $"Delete channel \"{channel.Name}\"?",
+            "VoiceCat", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
+        if (confirm != DialogResult.Yes) return;
+
+        _client.DeleteChannel(channelId);
+    }
+
+    private UserInfo? SelectedUser()
+    {
+        if (lstUsers.SelectedItem is not UserListItem item) return null;
+        _users.TryGetValue(item.UserId, out var user);
+        return user;
+    }
+
+    private void MoveSelectedUser()
+    {
+        var user = SelectedUser();
+        if (user is null) return;
+        using var dlg = new MoveUserDialog(_channels, user.ChannelId);
+        if (dlg.ShowDialog(this) != DialogResult.OK) return;
+        _client.MoveUser(user.Id, dlg.SelectedChannelId);
+    }
+
+    private void KickSelectedUser()
+    {
+        var user = SelectedUser();
+        if (user is null) return;
+        using var dlg = new InputDialog("Kick user", "&Reason:", "Kicked by admin");
+        string? reason = dlg.ShowDialog(this) == DialogResult.OK ? dlg.TextValue : null;
+        _client.KickUser(user.Id, reason);
+    }
+
+    private void BanSelectedUser()
+    {
+        var user = SelectedUser();
+        if (user is null) return;
+        using var dlg = new BanUserDialog(user.Nickname);
+        if (dlg.ShowDialog(this) != DialogResult.OK) return;
+        _client.BanUser(user.Id, dlg.Reason, dlg.ExpiresUnixMs);
+    }
+
+    private void ToggleServerMuteSelected()
+    {
+        var user = SelectedUser();
+        if (user is null) return;
+        _client.SetServerMute(user.Id, !user.ServerMuted, user.ServerDeafened);
+    }
+
+    private void ToggleServerDeafenSelected()
+    {
+        var user = SelectedUser();
+        if (user is null) return;
+        _client.SetServerMute(user.Id, user.ServerMuted, !user.ServerDeafened);
+    }
+
+    private void SetPermissionsSelected()
+    {
+        var user = SelectedUser();
+        if (user is null) return;
+        // The C ABI does not expose a user's current permissions, so start unchecked.
+        var current = new PermissionsInfo(false, false, false, false, false, false);
+        using var dlg = new PermissionsDialog(user.Nickname, current);
+        if (dlg.ShowDialog(this) != DialogResult.OK || dlg.Result is null) return;
+        _client.SetPermission(user.Id, dlg.Result);
+    }
+
     // ── Per-user tuning ───────────────────────────────────────────────────────
 
     private void OpenUserTuning()

clients/windows/VoiceCat.App/Forms/MoveUserDialog.cs

@@ -0,0 +1,79 @@
+using VoiceCat.Interop;
+
+namespace VoiceCat.App.Forms;
+
+/// <summary>
+/// Prompt the moderator to pick a destination channel for a user move.
+/// </summary>
+public sealed class MoveUserDialog : Form
+{
+    private readonly ComboBox _cboChannel;
+
+    public uint SelectedChannelId { get; private set; }
+
+    public MoveUserDialog(IEnumerable<ChannelInfo> channels, uint currentChannelId)
+    {
+        Text = "Move user to channel";
+        FormBorderStyle = FormBorderStyle.FixedDialog;
+        MaximizeBox = false;
+        MinimizeBox = false;
+        StartPosition = FormStartPosition.CenterParent;
+        AutoScaleMode = AutoScaleMode.Font;
+        ClientSize = new Size(384, 120);
+
+        var lbl = new Label
+        {
+            Text = "&Destination channel:",
+            Location = new Point(12, 12),
+            AutoSize = true,
+        };
+
+        _cboChannel = new ComboBox
+        {
+            Location = new Point(12, 36),
+            Size = new Size(360, 23),
+            DropDownStyle = ComboBoxStyle.DropDownList,
+            TabIndex = 1,
+        };
+
+        foreach (var ch in channels.OrderBy(c => c.Name))
+        {
+            _cboChannel.Items.Add(new ChannelItem(ch.Name, ch.Id));
+            if (ch.Id == currentChannelId) _cboChannel.SelectedIndex = _cboChannel.Items.Count - 1;
+        }
+        if (_cboChannel.SelectedIndex < 0 && _cboChannel.Items.Count > 0)
+            _cboChannel.SelectedIndex = 0;
+
+        var btnOk = new Button
+        {
+            Text = "&OK",
+            DialogResult = DialogResult.OK,
+            Location = new Point(216, 72),
+            Size = new Size(75, 27),
+            TabIndex = 2,
+        };
+        var btnCancel = new Button
+        {
+            Text = "&Cancel",
+            DialogResult = DialogResult.Cancel,
+            Location = new Point(297, 72),
+            Size = new Size(75, 27),
+            TabIndex = 3,
+        };
+
+        AcceptButton = btnOk;
+        CancelButton = btnCancel;
+        Controls.AddRange([lbl, _cboChannel, btnOk, btnCancel]);
+
+        btnOk.Click += (_, _) =>
+        {
+            SelectedChannelId = (_cboChannel.SelectedItem as ChannelItem)?.Id ?? 0;
+        };
+    }
+
+    private sealed class ChannelItem(string name, uint id)
+    {
+        public uint Id { get; } = id;
+        public override string ToString() => name;
+    }
+}

clients/windows/VoiceCat.App/Forms/PermissionsDialog.cs

@@ -0,0 +1,110 @@
+using VoiceCat.Interop;
+
+namespace VoiceCat.App.Forms;
+
+/// <summary>
+/// Edit a user's server permissions.
+/// </summary>
+public sealed class PermissionsDialog : Form
+{
+    private readonly CheckBox _chkCreateTemp;
+    private readonly CheckBox _chkKick;
+    private readonly CheckBox _chkBan;
+    private readonly CheckBox _chkMove;
+    private readonly CheckBox _chkAdminAccounts;
+    private readonly CheckBox _chkIsAdmin;
+
+    public PermissionsInfo? Result { get; private set; }
+
+    public PermissionsDialog(string nickname, PermissionsInfo current)
+    {
+        Text = $"Permissions — {nickname}";
+        FormBorderStyle = FormBorderStyle.FixedDialog;
+        MaximizeBox = false;
+        MinimizeBox = false;
+        StartPosition = FormStartPosition.CenterParent;
+        AutoScaleMode = AutoScaleMode.Font;
+        ClientSize = new Size(320, 260);
+
+        var lbl = new Label
+        {
+            Text = $"Set permissions for {nickname}:",
+            Location = new Point(12, 12),
+            AutoSize = true,
+        };
+
+        _chkCreateTemp = new CheckBox
+        {
+            Text = "Can create &temporary channels",
+            Location = new Point(12, 38),
+            AutoSize = true,
+            Checked = current.CanCreateTempChannel,
+        };
+        _chkKick = new CheckBox
+        {
+            Text = "Can &kick users",
+            Location = new Point(12, 64),
+            AutoSize = true,
+            Checked = current.CanKick,
+        };
+        _chkBan = new CheckBox
+        {
+            Text = "Can &ban users",
+            Location = new Point(12, 90),
+            AutoSize = true,
+            Checked = current.CanBan,
+        };
+        _chkMove = new CheckBox
+        {
+            Text = "Can &move users",
+            Location = new Point(12, 116),
+            AutoSize = true,
+            Checked = current.CanMoveUsers,
+        };
+        _chkAdminAccounts = new CheckBox
+        {
+            Text = "Can manage &accounts",
+            Location = new Point(12, 142),
+            AutoSize = true,
+            Checked = current.CanAdminAccounts,
+        };
+        _chkIsAdmin = new CheckBox
+        {
+            Text = "Is &admin",
+            Location = new Point(12, 168),
+            AutoSize = true,
+            Checked = current.IsAdmin,
+        };
+
+        var btnOk = new Button
+        {
+            Text = "&OK",
+            DialogResult = DialogResult.OK,
+            Location = new Point(152, 210),
+            Size = new Size(75, 27),
+        };
+        var btnCancel = new Button
+        {
+            Text = "&Cancel",
+            DialogResult = DialogResult.Cancel,
+            Location = new Point(233, 210),
+            Size = new Size(75, 27),
+        };
+
+        AcceptButton = btnOk;
+        CancelButton = btnCancel;
+        Controls.AddRange([lbl, _chkCreateTemp, _chkKick, _chkBan, _chkMove,
+                           _chkAdminAccounts, _chkIsAdmin, btnOk, btnCancel]);
+
+        btnOk.Click += (_, _) =>
+        {
+            Result = new PermissionsInfo(
+                CanCreateTempChannel: _chkCreateTemp.Checked,
+                CanKick: _chkKick.Checked,
+                CanBan: _chkBan.Checked,
+                CanMoveUsers: _chkMove.Checked,
+                CanAdminAccounts: _chkAdminAccounts.Checked,
+                IsAdmin: _chkIsAdmin.Checked);
+        };
+    }
+}

clients/windows/VoiceCat.Interop.Tests/VoiceCatClientSmokeTests.cs

@@ -55,6 +55,22 @@ public sealed class VoiceCatClientSmokeTests : IDisposable
         }
         Assert.True(port is not null, "voicecat-server.exe did not report a bound TCP port within 10s.");
         _port = port!.Value;
+
+        // M5: provision a known admin account so we can exercise moderation wrappers end-to-end.
+        string adminExe = Path.Combine(FindRepoRoot(), "build", "m1-dev", "bin", "voicecat-admin.exe");
+        Assert.True(File.Exists(adminExe), "voicecat-admin.exe not found — build the m1-dev preset.");
+        var adminPsi = new ProcessStartInfo(adminExe)
+        {
+            Arguments = $"--data-dir \"{_tempDir}\" account add admin2 --admin --password testpassword123",
+            RedirectStandardOutput = true,
+            RedirectStandardError = true,
+            UseShellExecute = false,
+        };
+        using (var adminProc = Process.Start(adminPsi) ?? throw new InvalidOperationException("failed to start voicecat-admin.exe"))
+        {
+            Assert.True(adminProc.WaitForExit(10000), "voicecat-admin.exe did not exit within 10s.");
+            Assert.Equal(0, adminProc.ExitCode);
+        }
     }
 
     public void Dispose()
@@ -124,6 +140,110 @@ public sealed class VoiceCatClientSmokeTests : IDisposable
         var channels = client.ListChannels();
         Assert.Contains(channels, c => c.Id == 1 && c.Name == "Lobby");
 
+        // M5: permissions getter round-trip.
+        var perms = client.GetPermissions();
+        Assert.False(perms.IsAdmin);
+        Assert.False(perms.CanKick);
+
+        // M5: moderation request wrappers queue without error. As a guest, account listing
+        // is rejected by the server with a GenericResult, which proves the wrapper path works
+        // end-to-end and that the new event type is delivered through P/Invoke.
+        Assert.Equal(VcResult.Ok, client.RequestAccountList());
+        Assert.True(PumpUntil(client,
+            () => events.Any(e => e.Type == VcEventType.GenericResult), 3000),
+            "did not receive VC_EVENT_GENERIC_RESULT for guest ListAccounts");
+        var generic = events.First(e => e.Type == VcEventType.GenericResult);
+        Assert.Equal(VcResult.PermissionDenied, generic.Result);
+
+        client.Disconnect();
+    }
+
+    [Fact]
+    public void Admin_ChannelCrud_AccountCrud_RoundTrips()
+    {
+        var events = new List<VoiceCatEvent>();
+        using var client = new VoiceCatClient("vc-csharp-admin", "0.1", VcLogLevel.Off,
+            tofuStorePath: Path.Combine(_tempDir, "tofu_pins_admin.txt"));
+        client.EventReceived += events.Add;
+
+        Assert.Equal(VcResult.Ok, client.Connect("127.0.0.1", _port));
+        Assert.Equal(VcResult.Ok, client.AuthenticateUser("admin2", "testpassword123"));
+
+        Assert.True(PumpUntil(client, () => events.Any(e => e.Type == VcEventType.ServerIdentity), 5000));
+        Assert.Equal(VcResult.Ok, client.ConfirmServerIdentity(accept: true));
+        Assert.True(PumpUntil(client, () => events.Any(e => e.Type == VcEventType.AuthResult), 5000));
+        Assert.Equal(VcResult.Ok, events.First(e => e.Type == VcEventType.AuthResult).Result);
+        Assert.True(PumpUntil(client, () => events.Any(e => e.Type == VcEventType.ChannelList), 3000));
+
+        var perms = client.GetPermissions();
+        Assert.True(perms.IsAdmin || perms.CanAdminAccounts);
+
+        // Channel CRUD
+        Assert.Equal(VcResult.Ok, client.CreateChannel(new ChannelEditInfo(
+            Id: 0,
+            ParentId: 0,
+            Name: "CSharp Test Channel",
+            Topic: "Created by C# smoke test",
+            PasswordProtected: false,
+            Password: null,
+            MaxUsers: 42,
+            SortOrder: 0,
+            Audio: new AudioConfigInfo(0, true, 48000, 64000, 20, 1, true, 5, false, 10))));
+        Assert.True(PumpUntil(client,
+            () => events.Any(e => e.Type == VcEventType.GenericResult && e.Result == VcResult.Ok), 3000),
+            "CreateChannel did not succeed");
+
+        var channels = client.ListChannels();
+        var created = channels.FirstOrDefault(c => c.Name == "CSharp Test Channel");
+        Assert.NotNull(created);
+        Assert.Equal("Created by C# smoke test", created.Topic);
+        Assert.True(created.PasswordProtected == false);
+
+        Assert.Equal(VcResult.Ok, client.EditChannel(new ChannelEditInfo(
+            created.Id,
+            created.ParentId,
+            created.Name,
+            "Updated topic",
+            created.PasswordProtected,
+            null,
+            100,
+            0,
+            new AudioConfigInfo(0, true, 48000, 64000, 20, 1, true, 5, false, 10))));
+        events.Clear();
+        Assert.True(PumpUntil(client,
+            () => events.Any(e => e.Type == VcEventType.GenericResult && e.Result == VcResult.Ok), 3000),
+            "EditChannel did not succeed");
+
+        Assert.Equal(VcResult.Ok, client.DeleteChannel(created.Id));
+        events.Clear();
+        Assert.True(PumpUntil(client,
+            () => events.Any(e => e.Type == VcEventType.GenericResult && e.Result == VcResult.Ok), 3000),
+            "DeleteChannel did not succeed");
+
+        // Account CRUD
+        Assert.Equal(VcResult.Ok, client.CreateAccount("csharp_smoke_user", "initialpw"));
+        events.Clear();
+        Assert.True(PumpUntil(client,
+            () => events.Any(e => e.Type == VcEventType.GenericResult && e.Result == VcResult.Ok), 3000),
+            "CreateAccount did not succeed");
+
+        Assert.Equal(VcResult.Ok, client.RequestAccountList());
+        Assert.True(PumpUntil(client, () => events.Any(e => e.Type == VcEventType.AccountList), 3000));
+        var accounts = client.ListAccounts();
+        Assert.Contains(accounts, a => a.Username == "csharp_smoke_user");
+
+        Assert.Equal(VcResult.Ok, client.ResetPassword("csharp_smoke_user", "newpw123"));
+        events.Clear();
+        Assert.True(PumpUntil(client,
+            () => events.Any(e => e.Type == VcEventType.GenericResult && e.Result == VcResult.Ok), 3000),
+            "ResetPassword did not succeed");
+
+        Assert.Equal(VcResult.Ok, client.DeleteAccount("csharp_smoke_user"));
+        events.Clear();
+        Assert.True(PumpUntil(client,
+            () => events.Any(e => e.Type == VcEventType.GenericResult && e.Result == VcResult.Ok), 3000),
+            "DeleteAccount did not succeed");
+
         client.Disconnect();
     }
 }

clients/windows/VoiceCat.Interop/Enums.cs

@@ -88,6 +88,10 @@ public enum VcEventType
     JoinResult = 12,
     /// <summary>M4: the TOFU server-identity gate — see VcTofuStatus.</summary>
     ServerIdentity = 13,
+    /// <summary>M5: async result for moderation/admin/channel operations.</summary>
+    GenericResult = 14,
+    /// <summary>M5: reply to VoiceCatClient.RequestAccountList — call ListAccounts() to read.</summary>
+    AccountList = 15,
 }
 
 /// <summary>

clients/windows/VoiceCat.Interop/Marshaling.cs

@@ -36,6 +36,7 @@ internal static class Marshaling
                 raw.Id,
                 raw.ParentId,
                 Marshal.PtrToStringUTF8(raw.Name) ?? string.Empty,
+                Marshal.PtrToStringUTF8(raw.Topic) ?? string.Empty,
                 raw.PasswordProtected != 0,
                 raw.MaxUsers));
         }
@@ -54,7 +55,11 @@ internal static class Marshaling
                 raw.Id,
                 Marshal.PtrToStringUTF8(raw.Nickname) ?? string.Empty,
                 raw.IsGuest != 0,
-                raw.ChannelId));
+                raw.ChannelId,
+                raw.SelfMicMuted != 0,
+                raw.SelfDeafened != 0,
+                raw.ServerMuted != 0,
+                raw.ServerDeafened != 0));
         }
         NativeMethods.vc_free_user_list(ref native);
         return result;
@@ -87,4 +92,29 @@ internal static class Marshaling
         native.ExpectedPacketLoss,
         native.Dtx != 0,
         native.Complexity);
+
+    public static PermissionsInfo ToManaged(in VcPermissionsNative native) => new(
+        native.CanCreateTempChannel != 0,
+        native.CanKick != 0,
+        native.CanBan != 0,
+        native.CanMoveUsers != 0,
+        native.CanAdminAccounts != 0,
+        native.IsAdmin != 0);
+
+    public static List<AccountInfo> ToManaged(ref VcAccountListNative native)
+    {
+        var result = new List<AccountInfo>((int)native.Count);
+        int size = Marshal.SizeOf<VcAccountNative>();
+        for (nuint i = 0; i < native.Count; i++)
+        {
+            var raw = Marshal.PtrToStructure<VcAccountNative>(native.Items + (int)i * size);
+            result.Add(new AccountInfo(
+                Marshal.PtrToStringUTF8(raw.Username) ?? string.Empty,
+                raw.IsAdmin != 0,
+                raw.CreatedAtUnixMs,
+                raw.LastLoginUnixMs));
+        }
+        NativeMethods.vc_free_account_list(ref native);
+        return result;
+    }
 }

clients/windows/VoiceCat.Interop/Models.cs

@@ -7,14 +7,44 @@ public sealed record ChannelInfo(
     uint Id,
     uint ParentId,
     string Name,
+    string Topic,
     bool PasswordProtected,
     uint MaxUsers);
 
+public sealed record ChannelEditInfo(
+    uint Id,
+    uint ParentId,
+    string Name,
+    string Topic,
+    bool PasswordProtected,
+    string? Password,
+    uint MaxUsers,
+    uint SortOrder,
+    AudioConfigInfo Audio);
+
 public sealed record UserInfo(
     uint Id,
     string Nickname,
     bool IsGuest,
-    uint ChannelId);
+    uint ChannelId,
+    bool SelfMicMuted,
+    bool SelfDeafened,
+    bool ServerMuted,
+    bool ServerDeafened);
+
+public sealed record PermissionsInfo(
+    bool CanCreateTempChannel,
+    bool CanKick,
+    bool CanBan,
+    bool CanMoveUsers,
+    bool CanAdminAccounts,
+    bool IsAdmin);
+
+public sealed record AccountInfo(
+    string Username,
+    bool IsAdmin,
+    ulong CreatedAtUnixMs,
+    ulong LastLoginUnixMs);
 
 public sealed record StreamSummary(
     uint StreamId,

clients/windows/VoiceCat.Interop/NativeMethods.cs

@@ -131,4 +131,54 @@ internal static partial class NativeMethods
     [LibraryImport(LibName)]
     internal static partial VcResult vc_get_server_identity_display(nint c, nint outBuf,
         nuint bufCap, out nuint outLen);
+
+    // ── M5: Moderation & admin ─────────────────────────────────────────────────────────────
+    [LibraryImport(LibName, StringMarshalling = StringMarshalling.Utf8)]
+    internal static partial VcResult vc_kick_user(nint c, uint userId, string? reason);
+
+    [LibraryImport(LibName, StringMarshalling = StringMarshalling.Utf8)]
+    internal static partial VcResult vc_ban_user(nint c, uint userId, string? reason,
+        ulong expiresUnixMs);
+
+    [LibraryImport(LibName)]
+    internal static partial VcResult vc_set_permission(nint c, uint userId,
+        in VcPermissionsNative perms);
+
+    [LibraryImport(LibName)]
+    internal static partial VcResult vc_set_server_mute(nint c, uint userId, int muted,
+        int deafened);
+
+    [LibraryImport(LibName)]
+    internal static partial VcResult vc_move_user(nint c, uint userId, uint channelId);
+
+    [LibraryImport(LibName)]
+    internal static partial VcResult vc_create_channel(nint c, in VcChannelInfoNative info);
+
+    [LibraryImport(LibName)]
+    internal static partial VcResult vc_edit_channel(nint c, in VcChannelInfoNative info);
+
+    [LibraryImport(LibName)]
+    internal static partial VcResult vc_delete_channel(nint c, uint channelId);
+
+    [LibraryImport(LibName, StringMarshalling = StringMarshalling.Utf8)]
+    internal static partial VcResult vc_create_account(nint c, string username, string password);
+
+    [LibraryImport(LibName, StringMarshalling = StringMarshalling.Utf8)]
+    internal static partial VcResult vc_reset_password(nint c, string username,
+        string newPassword);
+
+    [LibraryImport(LibName, StringMarshalling = StringMarshalling.Utf8)]
+    internal static partial VcResult vc_delete_account(nint c, string username);
+
+    [LibraryImport(LibName)]
+    internal static partial VcResult vc_list_accounts(nint c);
+
+    [LibraryImport(LibName)]
+    internal static partial VcResult vc_get_account_list(nint c, out VcAccountListNative outList);
+
+    [LibraryImport(LibName)]
+    internal static partial void vc_free_account_list(ref VcAccountListNative list);
+
+    [LibraryImport(LibName)]
+    internal static partial VcResult vc_get_permissions(nint c, out VcPermissionsNative outPerms);
 }

clients/windows/VoiceCat.Interop/Structs.cs

@@ -63,6 +63,31 @@ internal struct VcAudioConfigNative
     public uint Complexity;
 }
 
+[StructLayout(LayoutKind.Sequential)]
+internal struct VcPermissionsNative
+{
+    public int CanCreateTempChannel;
+    public int CanKick;
+    public int CanBan;
+    public int CanMoveUsers;
+    public int CanAdminAccounts;
+    public int IsAdmin;
+}
+
+[StructLayout(LayoutKind.Sequential)]
+internal struct VcChannelInfoNative
+{
+    public uint Id;
+    public uint ParentId;
+    public IntPtr Name;
+    public IntPtr Topic;
+    public int PasswordProtected;
+    public IntPtr Password;
+    public uint MaxUsers;
+    public uint SortOrder;
+    public VcAudioConfigNative Audio;
+}
+
 [StructLayout(LayoutKind.Sequential)]
 internal struct VcDeviceNative
 {
@@ -84,6 +109,7 @@ internal struct VcChannelNative
     public uint Id;
     public uint ParentId;
     public IntPtr Name;
+    public IntPtr Topic;
     public int PasswordProtected;
     public uint MaxUsers;
 }
@@ -102,6 +128,10 @@ internal struct VcUserNative
     public IntPtr Nickname;
     public int IsGuest;
     public uint ChannelId;
+    public int SelfMicMuted;
+    public int SelfDeafened;
+    public int ServerMuted;
+    public int ServerDeafened;
 }
 
 [StructLayout(LayoutKind.Sequential)]
@@ -125,3 +155,19 @@ internal struct VcStreamSummaryListNative
     public IntPtr Items;
     public nuint Count;
 }
+
+[StructLayout(LayoutKind.Sequential)]
+internal struct VcAccountNative
+{
+    public IntPtr Username;
+    public int IsAdmin;
+    public ulong CreatedAtUnixMs;
+    public ulong LastLoginUnixMs;
+}
+
+[StructLayout(LayoutKind.Sequential)]
+internal struct VcAccountListNative
+{
+    public IntPtr Items;
+    public nuint Count;
+}

clients/windows/VoiceCat.Interop/VoiceCatClient.cs

@@ -215,6 +215,124 @@ public sealed class VoiceCatClient : IDisposable
         return (r, r == VcResult.Ok ? Marshaling.ToManaged(in native) : null);
     }
 
+    // ── M5: Moderation & admin ───────────────────────────────────────────────────────────
+    public VcResult KickUser(uint userId, string? reason = null) =>
+        NativeMethods.vc_kick_user(_handle.DangerousGetHandle(), userId, reason);
+
+    public VcResult BanUser(uint userId, string? reason = null, ulong expiresUnixMs = 0) =>
+        NativeMethods.vc_ban_user(_handle.DangerousGetHandle(), userId, reason, expiresUnixMs);
+
+    public VcResult SetPermission(uint userId, PermissionsInfo perms)
+    {
+        var native = new VcPermissionsNative
+        {
+            CanCreateTempChannel = perms.CanCreateTempChannel ? 1 : 0,
+            CanKick = perms.CanKick ? 1 : 0,
+            CanBan = perms.CanBan ? 1 : 0,
+            CanMoveUsers = perms.CanMoveUsers ? 1 : 0,
+            CanAdminAccounts = perms.CanAdminAccounts ? 1 : 0,
+            IsAdmin = perms.IsAdmin ? 1 : 0,
+        };
+        return NativeMethods.vc_set_permission(_handle.DangerousGetHandle(), userId, in native);
+    }
+
+    public VcResult SetServerMute(uint userId, bool muted, bool deafened) =>
+        NativeMethods.vc_set_server_mute(_handle.DangerousGetHandle(), userId,
+            muted ? 1 : 0, deafened ? 1 : 0);
+
+    public VcResult MoveUser(uint userId, uint channelId) =>
+        NativeMethods.vc_move_user(_handle.DangerousGetHandle(), userId, channelId);
+
+    public VcResult CreateChannel(ChannelEditInfo info)
+    {
+        var native = ToNativeChannelInfo(info);
+        try
+        {
+            return NativeMethods.vc_create_channel(_handle.DangerousGetHandle(), in native);
+        }
+        finally
+        {
+            FreeChannelInfoStrings(native);
+        }
+    }
+
+    public VcResult EditChannel(ChannelEditInfo info)
+    {
+        var native = ToNativeChannelInfo(info);
+        try
+        {
+            return NativeMethods.vc_edit_channel(_handle.DangerousGetHandle(), in native);
+        }
+        finally
+        {
+            FreeChannelInfoStrings(native);
+        }
+    }
+
+    public VcResult DeleteChannel(uint channelId) =>
+        NativeMethods.vc_delete_channel(_handle.DangerousGetHandle(), channelId);
+
+    public VcResult CreateAccount(string username, string password) =>
+        NativeMethods.vc_create_account(_handle.DangerousGetHandle(), username, password);
+
+    public VcResult ResetPassword(string username, string newPassword) =>
+        NativeMethods.vc_reset_password(_handle.DangerousGetHandle(), username, newPassword);
+
+    public VcResult DeleteAccount(string username) =>
+        NativeMethods.vc_delete_account(_handle.DangerousGetHandle(), username);
+
+    public VcResult RequestAccountList() =>
+        NativeMethods.vc_list_accounts(_handle.DangerousGetHandle());
+
+    public List<AccountInfo> ListAccounts()
+    {
+        NativeMethods.vc_get_account_list(_handle.DangerousGetHandle(), out var native);
+        return Marshaling.ToManaged(ref native);
+    }
+
+    public PermissionsInfo GetPermissions()
+    {
+        NativeMethods.vc_get_permissions(_handle.DangerousGetHandle(), out var native);
+        return Marshaling.ToManaged(in native);
+    }
+
+    private static VcChannelInfoNative ToNativeChannelInfo(ChannelEditInfo info)
+    {
+        return new VcChannelInfoNative
+        {
+            Id = info.Id,
+            ParentId = info.ParentId,
+            Name = Marshal.StringToCoTaskMemUTF8(info.Name),
+            Topic = Marshal.StringToCoTaskMemUTF8(info.Topic),
+            PasswordProtected = info.PasswordProtected ? 1 : 0,
+            Password = string.IsNullOrEmpty(info.Password)
+                ? 0
+                : Marshal.StringToCoTaskMemUTF8(info.Password),
+            MaxUsers = info.MaxUsers,
+            SortOrder = info.SortOrder,
+            Audio = new VcAudioConfigNative
+            {
+                Codec = info.Audio.Codec,
+                Mode = info.Audio.Stereo ? 1u : 0u,
+                SampleRate = info.Audio.SampleRate,
+                BitrateBps = info.Audio.BitrateBps,
+                FrameMs = info.Audio.FrameMs,
+                Application = info.Audio.Application,
+                Fec = info.Audio.Fec ? 1 : 0,
+                ExpectedPacketLoss = info.Audio.ExpectedPacketLoss,
+                Dtx = info.Audio.Dtx ? 1 : 0,
+                Complexity = info.Audio.Complexity,
+            }
+        };
+    }
+
+    private static void FreeChannelInfoStrings(VcChannelInfoNative native)
+    {
+        if (native.Name != 0) Marshal.FreeCoTaskMem(native.Name);
+        if (native.Topic != 0) Marshal.FreeCoTaskMem(native.Topic);
+        if (native.Password != 0) Marshal.FreeCoTaskMem(native.Password);
+    }
+
     // ── Text ─────────────────────────────────────────────────────────────────────────────
     public VcResult SendText(VcTextScope scope, uint targetId, string utf8) =>
         NativeMethods.vc_send_text(_handle.DangerousGetHandle(), scope, targetId, utf8);

core/include/voicecat.h

@@ -233,6 +233,19 @@ typedef struct vc_permissions {
     int is_admin;                /* bool */
 } vc_permissions;
 
+/* M5: account entry (reply to vc_list_accounts / vc_get_account_list). */
+typedef struct vc_account {
+    const char* username;
+    int         is_admin;            /* bool */
+    uint64_t    created_at_unix_ms;
+    uint64_t    last_login_unix_ms;
+} vc_account;
+
+typedef struct vc_account_list {
+    vc_account* items;
+    size_t      count;
+} vc_account_list;
+
 /* M5: channel creation/edition descriptor. */
 typedef struct vc_channel_info {
     uint32_t id;                  /* 0 = new channel for create */
@@ -267,6 +280,7 @@ typedef struct vc_channel {
     uint32_t    id;
     uint32_t    parent_id;          /* 0 = root */
     const char* name;
+    const char* topic;
     int         password_protected; /* bool */
     uint32_t    max_users;          /* 0 = unlimited */
 } vc_channel;
@@ -281,6 +295,10 @@ typedef struct vc_user {
     const char* nickname;
     int         is_guest; /* bool */
     uint32_t    channel_id;
+    int         self_mic_muted; /* bool */
+    int         self_deafened;  /* bool */
+    int         server_muted;   /* bool */
+    int         server_deafened; /* bool */
 } vc_user;
 
 typedef struct vc_user_list {
@@ -424,6 +442,11 @@ VC_API vc_result vc_reset_password(vc_client* c, const char* username,
 VC_API vc_result vc_delete_account(vc_client* c, const char* username);
 VC_API vc_result vc_list_accounts(vc_client* c);
 
+/* Pull the last received account list (populated when VC_EVENT_ACCOUNT_LIST fires).
+ * Caller must free the list with vc_free_account_list. */
+VC_API vc_result vc_get_account_list(vc_client* c, vc_account_list* out);
+VC_API void      vc_free_account_list(vc_account_list* list);
+
 /* Pull the caller's own permissions (from the last AuthResult). */
 VC_API vc_result vc_get_permissions(vc_client* c, vc_permissions* out);
 

core/src/core/client.cpp

@@ -425,6 +425,11 @@ void vc_client::handle_envelope(const voicecat::v1::Envelope& env) {
             break;
         }
         case voicecat::v1::Envelope::kListAccountsResult: {
+            {
+                std::lock_guard lk(account_list_mu_);
+                last_account_list_.assign(env.list_accounts_result().accounts().begin(),
+                                          env.list_accounts_result().accounts().end());
+            }
             vc_event ev{};
             ev.type = VC_EVENT_ACCOUNT_LIST;
             emit(ev);
@@ -1304,10 +1309,13 @@ vc_result vc_client::list_channels(vc_channel_list* out) {
     for (size_t i = 0; i < channels.size(); ++i) {
         const auto& ch = channels[i];
         auto* name  = new char[ch.name.size() + 1];
+        auto* topic = new char[ch.topic.size() + 1];
         std::memcpy(name, ch.name.c_str(), ch.name.size() + 1);
+        std::memcpy(topic, ch.topic.c_str(), ch.topic.size() + 1);
         items[i].id                 = ch.id;
         items[i].parent_id          = ch.parent_id;
         items[i].name               = name;
+        items[i].topic              = topic;
         items[i].password_protected = ch.password_protected ? 1 : 0;
         items[i].max_users          = ch.max_users;
     }
@@ -1328,6 +1336,10 @@ vc_result vc_client::list_users(vc_user_list* out) {
         items[i].nickname        = nick;
         items[i].is_guest        = u.is_guest ? 1 : 0;
         items[i].channel_id      = u.channel_id;
+        items[i].self_mic_muted  = u.self_mic_muted ? 1 : 0;
+        items[i].self_deafened   = u.self_deafened ? 1 : 0;
+        items[i].server_muted    = u.server_muted ? 1 : 0;
+        items[i].server_deafened = u.server_deafened ? 1 : 0;
     }
     out->items = items;
     out->count = users.size();
@@ -1519,6 +1531,24 @@ vc_result vc_client::list_accounts() {
     return VC_OK;
 }
 
+vc_result vc_client::get_account_list(vc_account_list* out) {
+    if (!out) return VC_ERR_INVALID_ARG;
+    std::lock_guard lk(account_list_mu_);
+    auto* items = new vc_account[last_account_list_.size()];
+    for (size_t i = 0; i < last_account_list_.size(); ++i) {
+        const auto& a = last_account_list_[i];
+        auto* user = new char[a.username().size() + 1];
+        std::memcpy(user, a.username().c_str(), a.username().size() + 1);
+        items[i].username           = user;
+        items[i].is_admin           = a.is_admin() ? 1 : 0;
+        items[i].created_at_unix_ms = a.created_at_unix_ms();
+        items[i].last_login_unix_ms = a.last_login_unix_ms();
+    }
+    out->items = items;
+    out->count = last_account_list_.size();
+    return VC_OK;
+}
+
 vc_result vc_client::get_permissions(vc_permissions* out) {
     if (!out) return VC_ERR_INVALID_ARG;
     *out = own_permissions_;
@@ -1644,6 +1674,7 @@ vc_result vc_client::create_account(const char*, const char*) { return VC_ERR_NO
 vc_result vc_client::reset_password(const char*, const char*) { return VC_ERR_NOT_IMPLEMENTED; }
 vc_result vc_client::delete_account(const char*) { return VC_ERR_NOT_IMPLEMENTED; }
 vc_result vc_client::list_accounts() { return VC_ERR_NOT_IMPLEMENTED; }
+vc_result vc_client::get_account_list(vc_account_list*) { return VC_ERR_NOT_IMPLEMENTED; }
 vc_result vc_client::get_permissions(vc_permissions*) { return VC_ERR_NOT_IMPLEMENTED; }
 
 #endif  // VOICECAT_HAS_NET

core/src/core/client.h

@@ -90,6 +90,7 @@ struct vc_client {
     vc_result reset_password(const char* username, const char* new_password);
     vc_result delete_account(const char* username);
     vc_result list_accounts();
+    vc_result get_account_list(vc_account_list* out);
     vc_result get_permissions(vc_permissions* out);
 
     vc_connection_state state() const {
@@ -145,6 +146,11 @@ struct vc_client {
     voicecat::session::SessionModel session_model_;
     mutable std::mutex              session_model_mu_;
 
+    // M5: last ListAccountsResult snapshot, populated on io_thread_ when
+    // VC_EVENT_ACCOUNT_LIST fires and read by vc_get_account_list on caller threads.
+    std::vector<voicecat::v1::AccountEntry> last_account_list_;
+    mutable std::mutex                      account_list_mu_;
+
     // ── M4: TOFU server-identity gate ───────────────────────────────────────────
     std::unique_ptr<voicecat::crypto::TofuStore> tofu_store_;  // owns the pin file
     std::mutex              tofu_mu_;

core/src/session/session.cpp

@@ -58,6 +58,7 @@ void SessionModel::apply_snapshot(const voicecat::v1::ServerStateSnapshot& snap)
         ch.id                 = pb.id();
         ch.parent_id          = pb.parent_id();
         ch.name               = pb.name();
+        ch.topic              = pb.topic();
         ch.password_protected = pb.password_protected();
         ch.max_users          = pb.max_users();
         channels_.push_back(std::move(ch));
@@ -70,6 +71,8 @@ void SessionModel::apply_snapshot(const voicecat::v1::ServerStateSnapshot& snap)
         u.nickname        = pb.nickname();
         u.is_guest        = pb.is_guest();
         u.channel_id      = pb.channel_id();
+        u.self_mic_muted  = pb.self_mic_muted();
+        u.self_deafened   = pb.self_deafened();
         u.server_muted    = pb.server_muted();
         u.server_deafened = pb.server_deafened();
         u.streams         = copy_streams(pb.streams());
@@ -87,6 +90,8 @@ void SessionModel::apply_user_event(const voicecat::v1::UserEvent& ev) {
         u.nickname        = pb.nickname();
         u.is_guest        = pb.is_guest();
         u.channel_id      = pb.channel_id();
+        u.self_mic_muted  = pb.self_mic_muted();
+        u.self_deafened   = pb.self_deafened();
         u.server_muted    = pb.server_muted();
         u.server_deafened = pb.server_deafened();
         u.streams         = copy_streams(pb.streams());
@@ -113,6 +118,7 @@ void SessionModel::apply_channel_event(const voicecat::v1::ChannelEvent& ev) {
         ch.id                 = pb.id();
         ch.parent_id          = pb.parent_id();
         ch.name               = pb.name();
+        ch.topic              = pb.topic();
         ch.password_protected = pb.password_protected();
         ch.max_users          = pb.max_users();
 

core/src/session/session.h

@@ -22,6 +22,7 @@ struct Channel {
     uint32_t    id{0};
     uint32_t    parent_id{0};
     std::string name;
+    std::string topic;
     bool        password_protected{false};
     uint32_t    max_users{0};
 };
@@ -51,6 +52,8 @@ struct User {
     std::string         nickname;
     bool                is_guest{true};
     uint32_t            channel_id{0};
+    bool                self_mic_muted{false};
+    bool                self_deafened{false};
     bool                server_muted{false};
     bool                server_deafened{false};
     std::vector<Stream> streams;

core/src/voicecat.cpp

@@ -164,7 +164,10 @@ vc_result vc_list_channels(vc_client* c, vc_channel_list* out) {
 
 void vc_free_channel_list(vc_channel_list* list) {
     if (list == nullptr || list->items == nullptr) return;
-    for (size_t i = 0; i < list->count; ++i) delete[] list->items[i].name;
+    for (size_t i = 0; i < list->count; ++i) {
+        delete[] list->items[i].name;
+        delete[] list->items[i].topic;
+    }
     delete[] list->items;
     list->items = nullptr;
     list->count = 0;
@@ -268,6 +271,19 @@ vc_result vc_list_accounts(vc_client* c) {
     return c->list_accounts();
 }
 
+vc_result vc_get_account_list(vc_client* c, vc_account_list* out) {
+    if (c == nullptr || out == nullptr) return VC_ERR_INVALID_ARG;
+    return c->get_account_list(out);
+}
+
+void vc_free_account_list(vc_account_list* list) {
+    if (list == nullptr || list->items == nullptr) return;
+    for (size_t i = 0; i < list->count; ++i) delete[] list->items[i].username;
+    delete[] list->items;
+    list->items = nullptr;
+    list->count = 0;
+}
+
 vc_result vc_get_permissions(vc_client* c, vc_permissions* out) {
     if (c == nullptr || out == nullptr) return VC_ERR_INVALID_ARG;
     return c->get_permissions(out);

docs/roadmap.md

@@ -62,7 +62,9 @@ exists from M1 so the protocol can be exercised long before any GUI.
 **Exit:** non-technical user installs a client, saves a server, and joins.
 
 ### M5 — Moderation, polish, and beyond
-- Permissions/roles, kick/ban/server-mute, channel passwords UI.
+- Permissions/roles, kick/ban/server-mute, channel passwords UI. Windows WinForms UI complete
+  (channel CRUD with full Opus config, user moderation, server account management); macOS/iOS
+  Swift UI pending.
 - DRED toggle, audio-quality polish. (AEC and VAD/PTT already shipped in M2.)
 - **Then (post-v1, protocol already reserves space):** file transfer, E2EE option,
   CallKit/PushKit background voice, key-based identity, server-side text history,