canvas/src/app/globals.css

@@ -287,4 +287,17 @@ body {
     outline: 2px solid var(--accent, #3b5bdb);
     outline-offset: 2px;
   }
+
+  /* Global focus-visible fallback for Tailwind buttons (WCAG 2.4.7).
+     Specific component rules (e.g. .settings-panel__close:focus-visible)
+     override this via higher specificity. */
+  button:focus-visible {
+    outline: 2px solid var(--accent, #3b5bdb);
+    outline-offset: 2px;
+  }
+
+  a:focus-visible {
+    outline: 2px solid var(--accent, #3b5bdb);
+    outline-offset: 2px;
+  }
 }

canvas/src/components/mobile/MobileCanvas.tsx

@@ -205,6 +205,7 @@ export function MobileCanvas({
           type="button"
           onClick={resetView}
           aria-label="Reset zoom"
+          className="focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1"
           style={{
             position: "absolute",
             right: 14,
@@ -272,6 +273,8 @@ export function MobileCanvas({
             key={l.agent.id}
             type="button"
             onClick={() => onOpen(l.agent.id)}
+            aria-label={`Open ${l.agent.name}`}
+            className="focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1"
             style={{
               position: "absolute",
               left: `${l.x}%`,
@@ -376,6 +379,7 @@ export function MobileCanvas({
         type="button"
         onClick={onSpawn}
         aria-label="Spawn new agent"
+        className="focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-2"
         style={{
           position: "absolute",
           right: 24,

canvas/src/components/mobile/MobileChat.tsx

@@ -339,6 +339,7 @@ export function MobileChat({
             type="button"
             onClick={onBack}
             aria-label="Back"
+            className="focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1"
             style={{
               width: 36,
               height: 36,
@@ -385,6 +386,7 @@ export function MobileChat({
           <button
             type="button"
             aria-label="More"
+            className="focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1"
             style={{
               width: 36,
               height: 36,
@@ -402,35 +404,62 @@ export function MobileChat({
           </button>
         </div>
         {/* Sub-tabs */}
-        <div style={{ display: "flex", gap: 18, marginTop: 12, paddingLeft: 4 }}>
-          {(
-            [
-              { id: "my", label: "My Chat" },
-              { id: "a2a", label: "Agent Comms" },
-            ] as const
-          ).map((t) => {
-            const on = tab === t.id;
-            return (
-              <button
-                key={t.id}
-                type="button"
-                onClick={() => setTab(t.id)}
-                style={{
-                  padding: "4px 0 8px",
-                  border: "none",
-                  background: "transparent",
-                  fontSize: 13.5,
-                  cursor: "pointer",
-                  color: on ? p.text : p.text3,
-                  fontWeight: on ? 600 : 500,
-                  borderBottom: on ? `2px solid ${p.accent}` : "2px solid transparent",
-                }}
-              >
-                {t.label}
-              </button>
-            );
-          })}
-        </div>
+        {(
+          [
+            { id: "my", label: "My Chat" },
+            { id: "a2a", label: "Agent Comms" },
+          ] as const
+        ).map((t) => {
+          const on = tab === t.id;
+          return (
+            <button
+              key={t.id}
+              role="tab"
+              type="button"
+              tabIndex={on ? 0 : -1}
+              aria-selected={on}
+              onClick={() => setTab(t.id)}
+              onKeyDown={(e) => {
+                const tabs = ["my", "a2a"] as const;
+                const idx = tabs.indexOf(t.id);
+                let nextIdx: number | null = null;
+                if (e.key === "ArrowRight" || e.key === "ArrowDown") {
+                  nextIdx = (idx + 1) % tabs.length;
+                } else if (e.key === "ArrowLeft" || e.key === "ArrowUp") {
+                  nextIdx = (idx - 1 + tabs.length) % tabs.length;
+                } else if (e.key === "Home") {
+                  nextIdx = 0;
+                } else if (e.key === "End") {
+                  nextIdx = tabs.length - 1;
+                }
+                if (nextIdx !== null) {
+                  e.preventDefault();
+                  setTab(tabs[nextIdx]!);
+                  setTimeout(() => {
+                    const btns = document.querySelectorAll('[role="tab"]');
+                    (btns[nextIdx!] as HTMLButtonElement | null)?.focus();
+                  }, 0);
+                }
+              }}
+              className="focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1"
+              style={{
+                padding: "4px 0 8px",
+                marginTop: 12,
+                marginLeft: 4,
+                marginRight: 14,
+                border: "none",
+                background: "transparent",
+                fontSize: 13.5,
+                cursor: "pointer",
+                color: on ? p.text : p.text3,
+                fontWeight: on ? 600 : 500,
+                borderBottom: on ? `2px solid ${p.accent}` : "2px solid transparent",
+              }}
+            >
+              {t.label}
+            </button>
+          );
+        })}
       </div>
 
       {/* Messages */}
@@ -478,6 +507,7 @@ export function MobileChat({
               onClick={() => {
                 loadInitial();
               }}
+              className="focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1"
               style={{
                 padding: "6px 14px",
                 borderRadius: 14,
@@ -619,6 +649,7 @@ export function MobileChat({
                   type="button"
                   onClick={() => removePendingFile(i)}
                   aria-label={`Remove ${f.name}`}
+                  className="focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1"
                   style={{
                     border: "none",
                     background: "transparent",
@@ -659,6 +690,7 @@ export function MobileChat({
             onClick={() => fileInputRef.current?.click()}
             disabled={!reachable || sending || uploading}
             aria-label="Attach"
+            className="focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1"
             style={{
               width: 32,
               height: 32,
@@ -703,7 +735,9 @@ export function MobileChat({
               border: "none",
               outline: "none",
               background: "transparent",
-              fontSize: 14.5,
+              // 16px minimum prevents iOS from zooming the page when the
+              // textarea receives focus (iOS triggers zoom for font-size < 16).
+              fontSize: 16,
               lineHeight: 1.4,
               color: p.text,
               padding: "6px 0",
@@ -719,6 +753,7 @@ export function MobileChat({
             onClick={send}
             disabled={(!draft.trim() && pendingFiles.length === 0) || !reachable || sending || uploading}
             aria-label="Send"
+            className="focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1"
             style={{
               width: 36,
               height: 36,

canvas/src/components/mobile/MobileComms.tsx

@@ -205,7 +205,11 @@ export function MobileComms({ dark }: { dark: boolean }) {
         </p>
       </div>
 
-      <div style={{ display: "flex", gap: 6, padding: "12px 16px 8px" }}>
+      <div
+        role="radiogroup"
+        aria-label="Filter communications"
+        style={{ display: "flex", gap: 6, padding: "12px 16px 8px" }}
+      >
         {(
           [
             { id: "all", label: "All", n: items.length },
@@ -216,8 +220,34 @@ export function MobileComms({ dark }: { dark: boolean }) {
           return (
             <button
               key={o.id}
+              role="radio"
               type="button"
+              aria-checked={on}
+              tabIndex={on ? 0 : -1}
               onClick={() => setFilter(o.id)}
+              onKeyDown={(e) => {
+                const filters = ["all", "errors"] as const;
+                const idx = filters.indexOf(o.id as "all" | "errors");
+                let next: number | null = null;
+                if (e.key === "ArrowRight" || e.key === "ArrowDown") {
+                  next = (idx + 1) % filters.length;
+                } else if (e.key === "ArrowLeft" || e.key === "ArrowUp") {
+                  next = (idx - 1 + filters.length) % filters.length;
+                } else if (e.key === "Home") {
+                  next = 0;
+                } else if (e.key === "End") {
+                  next = filters.length - 1;
+                }
+                if (next !== null) {
+                  e.preventDefault();
+                  setFilter(filters[next]!);
+                  setTimeout(() => {
+                    const btns = document.querySelectorAll('[role="radio"]');
+                    (btns[next!] as HTMLButtonElement | null)?.focus();
+                  }, 0);
+                }
+              }}
+              className="focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1"
               style={{
                 display: "inline-flex",
                 alignItems: "center",
@@ -233,13 +263,7 @@ export function MobileComms({ dark }: { dark: boolean }) {
               }}
             >
               {o.label}
-              <span
-                style={{
-                  fontSize: 10.5,
-                  opacity: 0.7,
-                  fontFamily: MOBILE_FONT_MONO,
-                }}
-              >
+              <span aria-hidden="true" style={{ fontSize: 10.5, opacity: 0.7, fontFamily: MOBILE_FONT_MONO }}>
                 {o.n}
               </span>
             </button>

canvas/src/components/mobile/MobileDetail.tsx

@@ -83,11 +83,12 @@ export function MobileDetail({
             type="button"
             onClick={onBack}
             aria-label="Back"
+            className="focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1"
             style={iconButtonStyle(p, dark)}
           >
             {Icons.back({ size: 18 })}
           </button>
-          <button type="button" aria-label="More" style={iconButtonStyle(p, dark)}>
+          <button type="button" aria-label="More" className="focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1" style={iconButtonStyle(p, dark)}>
             {Icons.more({ size: 18 })}
           </button>
         </div>
@@ -168,6 +169,8 @@ export function MobileDetail({
 
       {/* Tabs */}
       <div
+        role="tablist"
+        aria-label="Agent detail sections"
         style={{
           display: "flex",
           gap: 4,
@@ -181,8 +184,33 @@ export function MobileDetail({
           return (
             <button
               key={t.id}
+              role="tab"
               type="button"
+              tabIndex={on ? 0 : -1}
+              aria-selected={on}
               onClick={() => setTab(t.id)}
+              onKeyDown={(e) => {
+                const idx = TABS.findIndex((x) => x.id === t.id);
+                let nextIdx: number | null = null;
+                if (e.key === "ArrowRight" || e.key === "ArrowDown") {
+                  nextIdx = (idx + 1) % TABS.length;
+                } else if (e.key === "ArrowLeft" || e.key === "ArrowUp") {
+                  nextIdx = (idx - 1 + TABS.length) % TABS.length;
+                } else if (e.key === "Home") {
+                  nextIdx = 0;
+                } else if (e.key === "End") {
+                  nextIdx = TABS.length - 1;
+                }
+                if (nextIdx !== null) {
+                  e.preventDefault();
+                  setTab(TABS[nextIdx]!.id);
+                  setTimeout(() => {
+                    const btns = document.querySelectorAll('[role="tab"]');
+                    (btns[nextIdx!] as HTMLButtonElement | null)?.focus();
+                  }, 0);
+                }
+              }}
+              className="focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1"
               style={{
                 padding: "8px 14px",
                 borderRadius: 999,
@@ -215,6 +243,7 @@ export function MobileDetail({
           type="button"
           onClick={onChat}
           data-testid="mobile-chat-cta"
+          className="focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-2"
           style={{
             width: "100%",
             height: 52,

canvas/src/components/mobile/MobileHome.tsx

@@ -183,6 +183,7 @@ export function MobileHome({
         type="button"
         onClick={onSpawn}
         aria-label="Spawn new agent"
+        className="focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-2"
         style={{
           position: "absolute",
           right: 24,

canvas/src/components/mobile/MobileMe.tsx

@@ -83,6 +83,7 @@ export function MobileMe({
                   type="button"
                   onClick={() => setAccent(c)}
                   aria-label={`Set accent ${c}`}
+                  className="focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1"
                   style={{
                     width: 36,
                     height: 36,
@@ -173,6 +174,7 @@ function SegmentedRow({
             key={o.id}
             type="button"
             onClick={() => onChange(o.id)}
+            className="focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1"
             style={{
               flex: 1,
               padding: "10px 8px",

canvas/src/components/mobile/MobileSpawn.tsx

@@ -148,6 +148,7 @@ export function MobileSpawn({ dark, onClose }: { dark: boolean; onClose: () => v
             type="button"
             onClick={onClose}
             aria-label="Close"
+            className="focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1"
             style={{
               width: 32,
               height: 32,
@@ -214,6 +215,7 @@ export function MobileSpawn({ dark, onClose }: { dark: boolean; onClose: () => v
                       setTplId(t.id);
                       setTier(tCode);
                     }}
+                    className="focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1"
                     style={{
                       background: on
                         ? dark
@@ -286,7 +288,7 @@ export function MobileSpawn({ dark, onClose }: { dark: boolean; onClose: () => v
                           justifyContent: "center",
                         }}
                       >
-                        {Icons.check({ size: 10, sw: 2.5 })}
+                        <span aria-hidden="true">{Icons.check({ size: 10, sw: 2.5 })}</span>
                       </span>
                     )}
                   </button>
@@ -330,6 +332,7 @@ export function MobileSpawn({ dark, onClose }: { dark: boolean; onClose: () => v
                 key={t}
                 type="button"
                 onClick={() => setTier(t)}
+                className="focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1"
                 style={{
                   flex: 1,
                   padding: "10px 8px",
@@ -377,6 +380,7 @@ export function MobileSpawn({ dark, onClose }: { dark: boolean; onClose: () => v
             type="button"
             onClick={handleSpawn}
             disabled={busy || !tplId || templates.length === 0}
+            className="focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-2"
             style={{
               width: "100%",
               height: 52,

canvas/src/components/mobile/components.tsx

@@ -291,6 +291,7 @@ export function AgentCard({
       data-testid="workspace-card"
       aria-label={`${agent.name}, status: ${agent.status}, tier ${agent.tier}${agent.remote ? ", remote" : ""}`}
       onClick={onClick}
+      className="focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1"
       style={{
         display: "block",
         width: "100%",
@@ -444,6 +445,7 @@ export function FilterChips({
             type="button"
             aria-checked={on}
             onClick={() => onChange(o.id)}
+            className="focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1"
             style={{
               display: "inline-flex",
               alignItems: "center",

canvas/src/styles/settings-panel.css

@@ -411,6 +411,11 @@
   color: #f4f4f5;
 }
 
+.secrets-tab__add-btn:focus-visible {
+  outline: var(--focus-ring);
+  outline-offset: var(--focus-ring-offset);
+}
+
 /* ── Shared UI ─────────────────────────────────────── */
 
 .key-value-field {
@@ -585,6 +590,11 @@
   background: #1e40af;
 }
 
+.secrets-tab__refresh-btn:focus-visible {
+  outline: var(--focus-ring);
+  outline-offset: var(--focus-ring-offset);
+}
+
 .secrets-tab__no-results {
   text-align: center;
   padding: 24px;
@@ -601,6 +611,11 @@
   font-size: 14px;
 }
 
+.secrets-tab__clear-search:focus-visible {
+  outline: var(--focus-ring);
+  outline-offset: var(--focus-ring-offset);
+}
+
 /* ── Delete confirmation dialog ────────────────────── */
 
 .delete-dialog__overlay {
@@ -661,6 +676,16 @@
 
 .delete-dialog__confirm-btn:disabled { opacity: 0.4; cursor: not-allowed; }
 
+.delete-dialog__confirm-btn:focus-visible {
+  outline: var(--focus-ring);
+  outline-offset: var(--focus-ring-offset);
+}
+
+.delete-dialog__cancel-btn:focus-visible {
+  outline: var(--focus-ring);
+  outline-offset: var(--focus-ring-offset);
+}
+
 /* ── Unsaved changes guard ─────────────────────────── */
 
 .guard-dialog__overlay {