diff --git a/app/App.tsx b/app/App.tsx
index b7f1138..64c0a97 100644
--- a/app/App.tsx
+++ b/app/App.tsx
@@ -17,6 +17,7 @@ import { ThemeProvider, useTheme } from './src/theme/ThemeProvider';
 import { loadAgents } from './src/store/agentsSlice';
 import { rehydrateChat } from './src/store/chatSlice';
 import { loadChatState } from './src/store/persistence';
+import { loadSettings } from './src/store/settingsSlice';
 
 function InnerApp() {
   const { scheme, colors } = useTheme();
@@ -30,6 +31,7 @@ function InnerApp() {
       const [persisted] = await Promise.all([
         loadChatState(),
         dispatch(loadAgents()),
+        dispatch(loadSettings()),
       ]);
       if (persisted) {
         dispatch(rehydrateChat(persisted));
diff --git a/app/src/screens/AgentsScreen/AgentEditor.tsx b/app/src/screens/AgentsScreen/AgentEditor.tsx
index d997210..b574490 100644
--- a/app/src/screens/AgentsScreen/AgentEditor.tsx
+++ b/app/src/screens/AgentsScreen/AgentEditor.tsx
@@ -40,6 +40,8 @@ export default function AgentEditor({ visible, agent, onClose }: Props) {
   const [avatarUri, setAvatarUri] = useState<string | null>(
     agent?.avatarUri ?? null,
   );
+  const [toolNow, setToolNow] = useState(agent?.tools?.now ?? false);
+  const [toolUsername, setToolUsername] = useState(agent?.tools?.username ?? false);
   const [pickingImage, setPickingImage] = useState(false);
   const [saving, setSaving] = useState(false);
 
@@ -49,6 +51,8 @@ export default function AgentEditor({ visible, agent, onClose }: Props) {
       setName(agent?.name ?? '');
       setPrompt(agent?.systemPrompt ?? 'Tu es un assistant utile et concis.');
       setAvatarUri(agent?.avatarUri ?? null);
+      setToolNow(agent?.tools?.now ?? false);
+      setToolUsername(agent?.tools?.username ?? false);
     }
   }, [visible, agent]);
 
@@ -91,6 +95,7 @@ export default function AgentEditor({ visible, agent, onClose }: Props) {
         name: name.trim(),
         systemPrompt: prompt.trim(),
         avatarUri: avatarUri ?? null,
+        tools: { now: toolNow, username: toolUsername },
       };
       await dispatch(saveAgent(updated));
       onClose();
@@ -176,6 +181,32 @@ export default function AgentEditor({ visible, agent, onClose }: Props) {
               numberOfLines={6}
               textAlignVertical="top"
             />
+
+            {/* Tools */}
+            <Text style={styles.label}>Tools context</Text>
+            <View style={styles.toolsRow}>
+              <TouchableOpacity
+                style={[styles.toolChip, toolNow && styles.toolChipActive]}
+                onPress={() => setToolNow(v => !v)}
+                activeOpacity={0.75}
+              >
+                <Text style={[styles.toolChipText, toolNow && styles.toolChipTextActive]}>
+                  🕒️ now
+                </Text>
+              </TouchableOpacity>
+              <TouchableOpacity
+                style={[styles.toolChip, toolUsername && styles.toolChipActive]}
+                onPress={() => setToolUsername(v => !v)}
+                activeOpacity={0.75}
+              >
+                <Text style={[styles.toolChipText, toolUsername && styles.toolChipTextActive]}>
+                  👤 username
+                </Text>
+              </TouchableOpacity>
+            </View>
+            <Text style={styles.toolsHint}>
+              Quand activés, ces données sont injectées automatiquement dans le contexte de l’agent au moment de l’inférence.
+            </Text>
           </ScrollView>
 
           {/* Actions */}
@@ -343,4 +374,39 @@ const styles = StyleSheet.create({
     color: colors.surface,
     fontWeight: typography.weights.semibold,
   },
+  toolsRow: {
+    flexDirection: 'row',
+    gap: spacing.sm,
+    marginBottom: spacing.xs,
+  },
+  toolChip: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    borderWidth: 1.5,
+    borderColor: colors.border,
+    borderRadius: 20,
+    paddingHorizontal: spacing.md,
+    paddingVertical: 7,
+    backgroundColor: colors.background,
+  },
+  toolChipActive: {
+    borderColor: colors.primary,
+    backgroundColor: colors.agentBg ?? colors.primary + '18',
+  },
+  toolChipText: {
+    fontSize: typography.sizes.sm,
+    color: colors.textSecondary,
+    fontWeight: typography.weights.medium,
+  },
+  toolChipTextActive: {
+    color: colors.primary,
+    fontWeight: typography.weights.semibold,
+  },
+  toolsHint: {
+    fontSize: typography.sizes.xs,
+    color: colors.textTertiary,
+    lineHeight: 17,
+    marginTop: 2,
+    marginBottom: spacing.sm,
+  },
 });
diff --git a/app/src/screens/SettingsScreen.tsx b/app/src/screens/SettingsScreen.tsx
index 925ed14..0e71a83 100644
--- a/app/src/screens/SettingsScreen.tsx
+++ b/app/src/screens/SettingsScreen.tsx
@@ -1,10 +1,13 @@
-import React, { useMemo } from 'react';
-import { View, Text, StyleSheet, TouchableOpacity } from 'react-native';
+import React, { useMemo, useEffect, useState } from 'react';
+import { View, Text, StyleSheet, TouchableOpacity, TextInput } from 'react-native';
 import type { CompositeScreenProps } from '@react-navigation/native';
 import type { BottomTabScreenProps } from '@react-navigation/bottom-tabs';
 import type { NativeStackScreenProps } from '@react-navigation/native-stack';
 import type { RootStackParamList, TabParamList } from '../navigation';
 import { useTheme } from '../theme/ThemeProvider';
+import { useDispatch, useSelector } from 'react-redux';
+import type { RootState, AppDispatch } from '../store';
+import { loadSettings, saveUsername } from '../store/settingsSlice';
 
 type TColors = {
   background: string;
@@ -21,9 +24,8 @@ function makeStyles(colors: TColors) {
   return StyleSheet.create({
     container: {
       flex: 1,
-      justifyContent: 'center',
-      alignItems: 'center',
       paddingHorizontal: 20,
+      paddingTop: 32,
     },
     text: {
       fontSize: 20,
@@ -58,8 +60,47 @@ function makeStyles(colors: TColors) {
     segmentTextActive: {
       color: colors.onPrimary ?? '#fff',
     },
-    buttonWrap: {
-      marginTop: 20,
+    sectionLabel: {
+      fontSize: 13,
+      fontWeight: '600',
+      color: colors.text,
+      opacity: 0.5,
+      textTransform: 'uppercase',
+      letterSpacing: 0.6,
+      marginTop: 28,
+      marginBottom: 8,
+    },
+    inputRow: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: 10,
+    },
+    input: {
+      flex: 1,
+      backgroundColor: colors.card,
+      borderRadius: 10,
+      paddingHorizontal: 14,
+      paddingVertical: 10,
+      fontSize: 16,
+      color: colors.text,
+      borderWidth: 1,
+      borderColor: colors.border,
+    },
+    saveBtn: {
+      backgroundColor: colors.primary,
+      borderRadius: 10,
+      paddingHorizontal: 16,
+      paddingVertical: 10,
+    },
+    saveBtnText: {
+      color: colors.onPrimary ?? '#fff',
+      fontWeight: '600',
+      fontSize: 14,
+    },
+    savedHint: {
+      marginTop: 6,
+      fontSize: 12,
+      color: colors.primary,
     },
   });
 }
@@ -72,7 +113,26 @@ type Props = CompositeScreenProps<
 
 export default function SettingsScreen({}: Props) {
   const { mode, setMode, colors } = useTheme();
-  const styles = useMemo(() => makeStyles(colors), [colors]);
+  const styles = useMemo(() => makeStyles(colors as unknown as TColors), [colors]);
+  const dispatch = useDispatch<AppDispatch>();
+  const storedUsername = useSelector((s: RootState) => s.settings.username);
+
+  const [localUsername, setLocalUsername] = useState(storedUsername);
+  const [saved, setSaved] = useState(false);
+
+  useEffect(() => {
+    dispatch(loadSettings());
+  }, [dispatch]);
+
+  useEffect(() => {
+    setLocalUsername(storedUsername);
+  }, [storedUsername]);
+
+  const handleSaveUsername = () => {
+    dispatch(saveUsername(localUsername.trim()));
+    setSaved(true);
+    setTimeout(() => setSaved(false), 2000);
+  };
 
   const items: { key: 'light' | 'system' | 'dark' | 'neon'; label: string }[] = [
     { key: 'light', label: 'Light' },
@@ -82,9 +142,28 @@ export default function SettingsScreen({}: Props) {
   ];
 
   return (
-    <View style={[styles.container, { backgroundColor: colors.background }]}> 
-      <Text style={[styles.text, { color: colors.text }]}>Settings</Text>
+    <View style={[styles.container, { backgroundColor: colors.background }]}>
+      {/* Username */}
+      <Text style={styles.sectionLabel}>Nom d'utilisateur</Text>
+      <View style={styles.inputRow}>
+        <TextInput
+          style={styles.input}
+          value={localUsername}
+          onChangeText={v => { setLocalUsername(v); setSaved(false); }}
+          placeholder="Ton prénom ou pseudo"
+          placeholderTextColor={`${colors.text}60`}
+          autoCorrect={false}
+          returnKeyType="done"
+          onSubmitEditing={handleSaveUsername}
+        />
+        <TouchableOpacity style={styles.saveBtn} onPress={handleSaveUsername}>
+          <Text style={styles.saveBtnText}>Enregistrer</Text>
+        </TouchableOpacity>
+      </View>
+      {saved && <Text style={styles.savedHint}>✓ Enregistré</Text>}
 
+      {/* Theme */}
+      <Text style={styles.sectionLabel}>Thème</Text>
       <View style={styles.segmentWrap}>
         <View style={styles.segmentBar}>
           {items.map((it) => {
diff --git a/app/src/store/chatThunks.ts b/app/src/store/chatThunks.ts
index 8377cb5..e1bde1b 100644
--- a/app/src/store/chatThunks.ts
+++ b/app/src/store/chatThunks.ts
@@ -83,10 +83,12 @@ export const generateResponse = createAsyncThunk(
       }
 
       const agentsState = (getState() as RootState).agents;
+      const username = (getState() as RootState).settings?.username ?? '';
       const systemPrompt = resolveSystemPrompt(
         effectiveCfg.systemPrompt,
         params.activeAgentId,
         agentsState?.agents ?? [],
+        username,
       );
 
       const oaiMessages = buildOAIMessages(params.messages, systemPrompt);
diff --git a/app/src/store/chatThunksHelpers.ts b/app/src/store/chatThunksHelpers.ts
index 99b6dd3..46e6ff5 100644
--- a/app/src/store/chatThunksHelpers.ts
+++ b/app/src/store/chatThunksHelpers.ts
@@ -153,15 +153,36 @@ export function resolveActiveStops(
 /**
  * Compose the effective system prompt: inject the selected agent's name and
  * system prompt in front of the model-level base prompt (if any).
+ * Active tools are injected as context lines BEFORE the agent prompt.
  */
 export function resolveSystemPrompt(
   basePrompt: string | undefined,
   activeAgentId: string | null | undefined,
   agents: Agent[],
+  username?: string,
 ): string | undefined {
   if (!activeAgentId) { return basePrompt; }
   const agent = agents.find(a => a.id === activeAgentId);
   if (!agent) { return basePrompt; }
-  const agentBlock = `[Agent: ${agent.name}]\n${agent.systemPrompt}`;
+
+  // Build tools context block
+  const toolLines: string[] = [];
+  if (agent.tools?.now) {
+    const now = new Date();
+    const formatted = now.toLocaleString('fr-FR', {
+      weekday: 'long', year: 'numeric', month: 'long', day: 'numeric',
+      hour: '2-digit', minute: '2-digit',
+    });
+    toolLines.push(`Date et heure actuelles : ${formatted}`);
+  }
+  if (agent.tools?.username && username) {
+    toolLines.push(`Nom de l'utilisateur : ${username}`);
+  }
+
+  const toolsBlock = toolLines.length > 0
+    ? `[Contexte]\n${toolLines.join('\n')}\n`
+    : '';
+
+  const agentBlock = `${toolsBlock}[Agent: ${agent.name}]\n${agent.systemPrompt}`;
   return basePrompt ? `${agentBlock}\n\n${basePrompt}` : agentBlock;
 }
diff --git a/app/src/store/index.ts b/app/src/store/index.ts
index 144966d..82b10f9 100644
--- a/app/src/store/index.ts
+++ b/app/src/store/index.ts
@@ -3,6 +3,7 @@ import modelsReducer from './modelsSlice';
 import chatReducer from './chatSlice';
 import hardwareReducer from './hardwareSlice';
 import agentsReducer from './agentsSlice';
+import settingsReducer from './settingsSlice';
 import { debouncedSaveChatState } from './persistence';
 
 const store = configureStore({
@@ -11,6 +12,7 @@ const store = configureStore({
     chat: chatReducer,
     hardware: hardwareReducer,
     agents: agentsReducer,
+    settings: settingsReducer,
   },
 });
 
diff --git a/app/src/store/settingsSlice.ts b/app/src/store/settingsSlice.ts
new file mode 100644
index 0000000..e1cfd8f
--- /dev/null
+++ b/app/src/store/settingsSlice.ts
@@ -0,0 +1,46 @@
+import { createSlice, createAsyncThunk } from '@reduxjs/toolkit';
+import AsyncStorage from '@react-native-async-storage/async-storage';
+
+const STORAGE_KEY = '@settings_v1';
+
+export interface SettingsState {
+  username: string;
+}
+
+const initialState: SettingsState = { username: '' };
+
+export const loadSettings = createAsyncThunk('settings/load', async () => {
+  const raw = await AsyncStorage.getItem(STORAGE_KEY);
+  if (!raw) { return initialState; }
+  try {
+    return JSON.parse(raw) as SettingsState;
+  } catch {
+    return initialState;
+  }
+});
+
+export const saveUsername = createAsyncThunk(
+  'settings/saveUsername',
+  async (username: string) => {
+    const raw = await AsyncStorage.getItem(STORAGE_KEY);
+    const current = raw ? (JSON.parse(raw) as Partial<SettingsState>) : {};
+    await AsyncStorage.setItem(STORAGE_KEY, JSON.stringify({ ...current, username }));
+    return username;
+  },
+);
+
+const settingsSlice = createSlice({
+  name: 'settings',
+  initialState,
+  reducers: {},
+  extraReducers: builder => {
+    builder.addCase(loadSettings.fulfilled, (state, action) => {
+      state.username = action.payload.username ?? '';
+    });
+    builder.addCase(saveUsername.fulfilled, (state, action) => {
+      state.username = action.payload;
+    });
+  },
+});
+
+export default settingsSlice.reducer;
diff --git a/app/src/store/types.ts b/app/src/store/types.ts
index 962c07b..fbed0d5 100644
--- a/app/src/store/types.ts
+++ b/app/src/store/types.ts
@@ -139,6 +139,11 @@ export interface Agent {
   systemPrompt: string;
   /** URI du fichier image local (dans DocumentDirectoryPath) ou null */
   avatarUri?: string | null;
+  /** Tools actifs pour cet agent — injectés automatiquement dans le prompt système */
+  tools?: {
+    now?: boolean;
+    username?: boolean;
+  };
 }
 
 export interface AgentsState {