diff --git a/.jules/palette.md b/.jules/palette.md
new file mode 100644
index 00000000..530948af
--- /dev/null
+++ b/.jules/palette.md
@@ -0,0 +1,3 @@
+## 2024-05-25 - Accessibility for textual icon buttons
+**Learning:** Textual icons (like `>`) used in icon-only buttons can be read confusingly by screen readers (e.g. "greater than"). It is necessary to hide them with `aria-hidden="true"` while providing a descriptive `aria-label` on the parent `<button>`, particularly localized strings like "Envoyer le message" in this application's French context.
+**Action:** Always wrap literal text icons in `<span aria-hidden="true">` when the parent button has an `aria-label` to prevent redundant or confusing screen reader announcements.
\ No newline at end of file
diff --git a/src/components/discussion/composer/ComposerInput.tsx b/src/components/discussion/composer/ComposerInput.tsx
index 43d51466..57074668 100644
--- a/src/components/discussion/composer/ComposerInput.tsx
+++ b/src/components/discussion/composer/ComposerInput.tsx
@@ -1,5 +1,5 @@
-import type { SwarmWorkCommand } from '../../../lib/forge-agent-protocol';
-import { SWARM_WORK_COMMAND_LABELS } from '../../../lib/forge-agent-protocol';
+import type { SwarmWorkCommand } from "../../../lib/forge-agent-protocol";
+import { SWARM_WORK_COMMAND_LABELS } from "../../../lib/forge-agent-protocol";
 
 interface Props {
   message: string;
@@ -10,19 +10,44 @@ interface Props {
   agentId: string;
   send: () => Promise<void>;
   applySwarmCommand: (cmd: SwarmWorkCommand) => void;
-  swarmCommandMode: 'direct' | 'leader';
-  setSwarmCommandMode: (mode: 'direct' | 'leader' | ((prev: 'direct' | 'leader') => 'direct' | 'leader')) => void;
+  swarmCommandMode: "direct" | "leader";
+  setSwarmCommandMode: (
+    mode:
+      | "direct"
+      | "leader"
+      | ((prev: "direct" | "leader") => "direct" | "leader"),
+  ) => void;
 }
 
 export default function ComposerInput({
-  message, setMessage, sending, historyLoading, sessionUnavailable, agentId,
-  send, applySwarmCommand, swarmCommandMode, setSwarmCommandMode
+  message,
+  setMessage,
+  sending,
+  historyLoading,
+  sessionUnavailable,
+  agentId,
+  send,
+  applySwarmCommand,
+  swarmCommandMode,
+  setSwarmCommandMode,
 }: Props) {
   return (
-    <div class="sticky bottom-0 z-20 shrink-0 border-t border-gray-200 bg-white/95 p-3 backdrop-blur sm:p-4" style="padding-bottom: max(0.75rem, env(safe-area-inset-bottom));">
+    <div
+      class="sticky bottom-0 z-20 shrink-0 border-t border-gray-200 bg-white/95 p-3 backdrop-blur sm:p-4"
+      style="padding-bottom: max(0.75rem, env(safe-area-inset-bottom));"
+    >
       <div class="mx-auto mb-2 flex max-w-3xl flex-wrap items-center gap-2">
-        <span class="text-[10px] font-semibold uppercase tracking-wide text-gray-500">Commandes</span>
-        {(['start_work', 'pause_work', 'resume_work', 'stop_work'] as SwarmWorkCommand[]).map((cmd) => (
+        <span class="text-[10px] font-semibold uppercase tracking-wide text-gray-500">
+          Commandes
+        </span>
+        {(
+          [
+            "start_work",
+            "pause_work",
+            "resume_work",
+            "stop_work",
+          ] as SwarmWorkCommand[]
+        ).map((cmd) => (
           <button
             key={cmd}
             type="button"
@@ -35,8 +60,10 @@ export default function ComposerInput({
         ))}
         <button
           type="button"
-          class={`ml-auto min-h-[36px] rounded-full border px-3 py-1 text-[11px] font-medium ${swarmCommandMode === 'leader' ? 'bg-[#E9F3EB]' : 'bg-white'}`}
-          onClick={() => setSwarmCommandMode(m => m === 'leader' ? 'direct' : 'leader')}
+          class={`ml-auto min-h-[36px] rounded-full border px-3 py-1 text-[11px] font-medium ${swarmCommandMode === "leader" ? "bg-[#E9F3EB]" : "bg-white"}`}
+          onClick={() =>
+            setSwarmCommandMode((m) => (m === "leader" ? "direct" : "leader"))
+          }
           disabled={sending || historyLoading}
         >
           mode {swarmCommandMode}
@@ -50,7 +77,7 @@ export default function ComposerInput({
           onInput={(e) => setMessage((e.target as HTMLTextAreaElement).value)}
           disabled={sending || historyLoading || sessionUnavailable}
           onKeyDown={(e) => {
-            if (e.key === 'Enter' && !e.shiftKey && (e.ctrlKey || e.metaKey)) {
+            if (e.key === "Enter" && !e.shiftKey && (e.ctrlKey || e.metaKey)) {
               e.preventDefault();
               void send();
             }
@@ -59,10 +86,18 @@ export default function ComposerInput({
         <button
           type="button"
           onClick={() => void send()}
-          disabled={sending || historyLoading || sessionUnavailable || !message.trim() || !agentId}
-          class="flex h-11 w-11 shrink-0 items-center justify-center rounded-xl bg-[#175B37] text-white disabled:opacity-40"
+          disabled={
+            sending ||
+            historyLoading ||
+            sessionUnavailable ||
+            !message.trim() ||
+            !agentId
+          }
+          class="flex h-11 w-11 shrink-0 items-center justify-center rounded-xl bg-[#175B37] text-white disabled:opacity-40 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-[#175B37] focus-visible:ring-offset-1"
+          aria-label="Envoyer le message"
+          title="Envoyer le message"
         >
-          &gt;
+          <span aria-hidden="true">&gt;</span>
         </button>
       </div>
     </div>
diff --git a/src/components/discussion/composer/DiscussionHeader.tsx b/src/components/discussion/composer/DiscussionHeader.tsx
index 5a7815f7..98a9a1ba 100644
--- a/src/components/discussion/composer/DiscussionHeader.tsx
+++ b/src/components/discussion/composer/DiscussionHeader.tsx
@@ -1,7 +1,7 @@
-import type { AgentTeamProfile } from '../../../lib/agent-profile';
-import type { Project, RequestItem } from './types';
-import TeamAvatar from '../../agents/TeamAvatar';
-import { truncateText } from './types';
+import type { AgentTeamProfile } from "../../../lib/agent-profile";
+import type { Project, RequestItem } from "./types";
+import TeamAvatar from "../../agents/TeamAvatar";
+import { truncateText } from "./types";
 
 interface Props {
   selectedTeamProfile?: AgentTeamProfile;
@@ -15,28 +15,40 @@ interface Props {
   onEmptyMemberClick?: () => void;
   onOpenProfile?: () => void;
   policyBadge?: {
-    mode: 'off' | 'warn' | 'enforce';
-    state: 'idle' | 'compliant' | 'non_compliant';
+    mode: "off" | "warn" | "enforce";
+    state: "idle" | "compliant" | "non_compliant";
   };
 }
 
 export default function DiscussionHeader({
-  selectedTeamProfile, selectedAgentId, selectedProject, selectedRequest,
-  setHeaderMenuOpen, headerMenuOpen, copyToClipboard, onEmptyMemberClick, onOpenProfile, policyBadge
+  selectedTeamProfile,
+  selectedAgentId,
+  selectedProject,
+  selectedRequest,
+  setHeaderMenuOpen,
+  headerMenuOpen,
+  copyToClipboard,
+  onEmptyMemberClick,
+  onOpenProfile,
+  policyBadge,
 }: Props) {
   const badgeClass =
-    policyBadge?.state === 'compliant'
-      ? 'border-emerald-200 bg-emerald-50 text-emerald-700'
-      : policyBadge?.state === 'non_compliant'
-        ? 'border-rose-200 bg-rose-50 text-rose-700'
-        : 'border-amber-200 bg-amber-50 text-amber-700';
+    policyBadge?.state === "compliant"
+      ? "border-emerald-200 bg-emerald-50 text-emerald-700"
+      : policyBadge?.state === "non_compliant"
+        ? "border-rose-200 bg-rose-50 text-rose-700"
+        : "border-amber-200 bg-amber-50 text-amber-700";
 
   return (
     <header class="relative flex shrink-0 items-start justify-between gap-3 border-b border-gray-200 bg-white px-4 py-3 sm:px-5">
       <div class="flex min-w-0 flex-1 gap-3">
         {selectedTeamProfile ? (
           <div class="hidden shrink-0 sm:block">
-            <TeamAvatar profile={selectedTeamProfile} size="md" class="rounded-2xl shadow-inner ring-1 ring-gray-100" />
+            <TeamAvatar
+              profile={selectedTeamProfile}
+              size="md"
+              class="rounded-2xl shadow-inner ring-1 ring-gray-100"
+            />
           </div>
         ) : (
           <div class="hidden h-12 w-12 shrink-0 items-center justify-center rounded-2xl bg-gray-100 text-sm font-bold text-gray-400 shadow-inner sm:flex">
@@ -64,7 +76,7 @@ export default function DiscussionHeader({
             <>
               <div class="flex flex-wrap items-center gap-2">
                 <h2 class="truncate text-base font-semibold text-gray-900 sm:text-lg">
-                  {selectedTeamProfile?.displayName ?? 'Sélectionnez un membre'}
+                  {selectedTeamProfile?.displayName ?? "Sélectionnez un membre"}
                 </h2>
                 {selectedTeamProfile ? (
                   <span class="rounded-full bg-gray-100 px-2 py-0.5 text-[11px] font-medium text-gray-600">
@@ -75,7 +87,7 @@ export default function DiscussionHeader({
               <p class="mt-0.5 truncate text-xs text-gray-500 sm:text-sm">
                 {selectedTeamProfile
                   ? `Agent ZimaOS · ${selectedTeamProfile.presenceLabel} · modèle ${selectedTeamProfile.modelShort}`
-                  : 'Choisissez un membre dans la liste.'}
+                  : "Choisissez un membre dans la liste."}
               </p>
             </>
           )}
@@ -88,15 +100,23 @@ export default function DiscussionHeader({
               ) : null}
               {selectedRequest ? (
                 <span class="rounded-full border border-gray-200 bg-gray-50 px-2 py-0.5 text-[11px] text-gray-600">
-                  #{selectedRequest.id} · {truncateText(selectedRequest.title, 28)}
+                  #{selectedRequest.id} ·{" "}
+                  {truncateText(selectedRequest.title, 28)}
                 </span>
               ) : null}
             </div>
           )}
-          {policyBadge && policyBadge.mode !== 'off' ? (
+          {policyBadge && policyBadge.mode !== "off" ? (
             <div class="mt-2">
-              <span class={`inline-flex items-center rounded-full border px-2 py-0.5 text-[11px] font-medium ${badgeClass}`}>
-                Policy strict: {policyBadge.mode} · {policyBadge.state === 'compliant' ? 'conforme' : policyBadge.state === 'non_compliant' ? 'non conforme' : 'en attente'}
+              <span
+                class={`inline-flex items-center rounded-full border px-2 py-0.5 text-[11px] font-medium ${badgeClass}`}
+              >
+                Policy strict: {policyBadge.mode} ·{" "}
+                {policyBadge.state === "compliant"
+                  ? "conforme"
+                  : policyBadge.state === "non_compliant"
+                    ? "non conforme"
+                    : "en attente"}
               </span>
             </div>
           ) : null}
@@ -113,10 +133,19 @@ export default function DiscussionHeader({
         </button>
         <button
           type="button"
-          class="flex h-11 w-11 items-center justify-center rounded-full border border-gray-200 text-gray-500 transition hover:bg-gray-50 hover:text-gray-800"
+          class="flex h-11 w-11 items-center justify-center rounded-full border border-gray-200 text-gray-500 transition hover:bg-gray-50 hover:text-gray-800 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-gray-400 focus-visible:ring-offset-1"
           onClick={() => setHeaderMenuOpen((v: boolean) => !v)}
+          aria-label="Ouvrir le menu des options"
+          title="Ouvrir le menu des options"
+          aria-haspopup="true"
+          aria-expanded={headerMenuOpen}
         >
-          <svg class="h-5 w-5" fill="currentColor" viewBox="0 0 24 24">
+          <svg
+            class="h-5 w-5"
+            fill="currentColor"
+            viewBox="0 0 24 24"
+            aria-hidden="true"
+          >
             <path d="M12 8a2 2 0 110-4 2 2 0 010 4zm0 6a2 2 0 110-4 2 2 0 010 4zm0 6a2 2 0 110-4 2 2 0 010 4z" />
           </svg>
         </button>
@@ -124,7 +153,10 @@ export default function DiscussionHeader({
           <div class="absolute right-0 top-10 z-20 mt-1 w-52 overflow-hidden rounded-xl border border-gray-200 bg-white py-1 shadow-lg">
             <button
               class="block w-full px-3 py-2 text-left text-sm hover:bg-gray-50"
-              onClick={() => { setHeaderMenuOpen(false); if (selectedAgentId) void copyToClipboard(selectedAgentId); }}
+              onClick={() => {
+                setHeaderMenuOpen(false);
+                if (selectedAgentId) void copyToClipboard(selectedAgentId);
+              }}
               disabled={!selectedAgentId}
             >
               Copier la clé de session