diff --git a/backend/app/agent.py b/backend/app/agent.py
index dad3b8e..3360f98 100644
--- a/backend/app/agent.py
+++ b/backend/app/agent.py
@@ -40,9 +40,17 @@ async def run_agent(
     convo: list[dict],
     *,
     options: dict | None = None,
-    tools_enabled: bool = True,
+    enabled_tools: list[str] | None = None,
 ) -> AsyncIterator[dict]:
-    tools = TOOL_DEFINITIONS if tools_enabled else None
+    # enabled_tools=None -> tous les outils ; liste vide -> aucun outil.
+    if enabled_tools is None:
+        tools = TOOL_DEFINITIONS
+    elif enabled_tools:
+        tools = [
+            t for t in TOOL_DEFINITIONS if t["function"]["name"] in enabled_tools
+        ]
+    else:
+        tools = None
     collected: list[dict] = []
     text_parts: list[str] = []
 
diff --git a/backend/app/agent_config.py b/backend/app/agent_config.py
new file mode 100644
index 0000000..286f653
--- /dev/null
+++ b/backend/app/agent_config.py
@@ -0,0 +1,66 @@
+"""Profil de configuration de l'agent : invite système, génération, outils.
+
+Persisté en base sous la clé `agent`. Fournit les valeurs par défaut et la
+fusion avec ce qui est stocké, pour rester robuste aux montées de version.
+"""
+from __future__ import annotations
+
+from . import db
+
+CONFIG_KEY = "agent"
+
+DEFAULT_SYSTEM_PROMPT = (
+    "Tu es Loki, un assistant de développement local agentique. Tu disposes "
+    "d'outils pour lire, écrire et lister des fichiers dans le workspace. "
+    "Utilise-les pour accomplir les tâches concrètement, puis réponds de façon "
+    "concise en français. Après avoir écrit un fichier, propose un aperçu."
+)
+
+# Outils réellement disponibles (les sensibles arrivent en phase 7).
+AVAILABLE_TOOLS = ["read_file", "write_file", "list_dir"]
+
+DEFAULT_CONFIG: dict = {
+    "system_prompt": DEFAULT_SYSTEM_PROMPT,
+    "temperature": 0.7,
+    "top_p": 0.9,
+    "top_k": 40,
+    "max_tokens": 2048,
+    "tools": {name: True for name in AVAILABLE_TOOLS},
+}
+
+
+def get_config() -> dict:
+    """Config courante = défauts fusionnés avec le stockage."""
+    stored = db.get_config_value(CONFIG_KEY) or {}
+    cfg = {**DEFAULT_CONFIG, **stored}
+    cfg["tools"] = {
+        name: bool(stored.get("tools", {}).get(name, True))
+        for name in AVAILABLE_TOOLS
+    }
+    return cfg
+
+
+def save_config(patch: dict) -> dict:
+    """Applique une mise à jour partielle et renvoie la config complète."""
+    cfg = {**get_config(), **{k: v for k, v in patch.items() if v is not None}}
+    if "tools" in patch and patch["tools"]:
+        cfg["tools"] = {
+            name: bool(patch["tools"].get(name, cfg["tools"].get(name, True)))
+            for name in AVAILABLE_TOOLS
+        }
+    db.set_config_value(CONFIG_KEY, cfg)
+    return get_config()
+
+
+def ollama_options(cfg: dict) -> dict:
+    """Traduit la config en options de génération Ollama."""
+    return {
+        "temperature": cfg["temperature"],
+        "top_p": cfg["top_p"],
+        "top_k": cfg["top_k"],
+        "num_predict": cfg["max_tokens"],
+    }
+
+
+def enabled_tool_names(cfg: dict) -> list[str]:
+    return [name for name, on in cfg["tools"].items() if on]
diff --git a/backend/app/db.py b/backend/app/db.py
index 17641d0..832c430 100644
--- a/backend/app/db.py
+++ b/backend/app/db.py
@@ -54,6 +54,10 @@ def init_db() -> None:
         cols = {r["name"] for r in conn.execute("PRAGMA table_info(messages)")}
         if "meta" not in cols:
             conn.execute("ALTER TABLE messages ADD COLUMN meta TEXT")
+        # Table clé/valeur pour la configuration de l'agent.
+        conn.execute(
+            "CREATE TABLE IF NOT EXISTS config (key TEXT PRIMARY KEY, value TEXT)"
+        )
 
 
 def _now() -> float:
@@ -160,3 +164,22 @@ def list_messages_for_model(sid: str) -> list[dict]:
         {"role": m["role"], "content": m["content"]}
         for m in list_messages(sid)
     ]
+
+
+# ── Configuration (clé/valeur JSON) ──────────────────────────────────────
+def get_config_value(key: str) -> dict | None:
+    with _LOCK, _connect() as conn:
+        row = conn.execute(
+            "SELECT value FROM config WHERE key = ?", (key,)
+        ).fetchone()
+    return json.loads(row["value"]) if row else None
+
+
+def set_config_value(key: str, value: dict) -> None:
+    payload = json.dumps(value, ensure_ascii=False)
+    with _LOCK, _connect() as conn:
+        conn.execute(
+            "INSERT INTO config (key, value) VALUES (?, ?)"
+            " ON CONFLICT(key) DO UPDATE SET value = excluded.value",
+            (key, payload),
+        )
diff --git a/backend/app/main.py b/backend/app/main.py
index 5b8700a..033cf40 100644
--- a/backend/app/main.py
+++ b/backend/app/main.py
@@ -14,7 +14,7 @@ from fastapi.staticfiles import StaticFiles
 
 from . import db
 from .config import settings
-from .routes import chat, files, models, sessions
+from .routes import chat, config, files, models, sessions
 
 
 @asynccontextmanager
@@ -40,6 +40,7 @@ app.include_router(models.router)
 app.include_router(sessions.router)
 app.include_router(chat.router)
 app.include_router(files.router)
+app.include_router(config.router)
 
 
 @app.get("/api/health")
diff --git a/backend/app/routes/chat.py b/backend/app/routes/chat.py
index d63ad42..71b618b 100644
--- a/backend/app/routes/chat.py
+++ b/backend/app/routes/chat.py
@@ -14,26 +14,17 @@ from fastapi import APIRouter, HTTPException
 from fastapi.responses import StreamingResponse
 from pydantic import BaseModel
 
-from .. import db
+from .. import agent_config, db
 from ..agent import run_agent
 from ..config import settings
 
 router = APIRouter(prefix="/api", tags=["chat"])
 
-SYSTEM_PROMPT = (
-    "Tu es Loki, un assistant de développement local agentique. Tu disposes "
-    "d'outils pour lire, écrire et lister des fichiers dans le workspace. "
-    "Utilise-les pour accomplir les tâches concrètement, puis réponds de façon "
-    "concise en français. Après avoir écrit un fichier, propose un aperçu."
-)
-
 
 class ChatRequest(BaseModel):
     session_id: str
     content: str
     model: str | None = None
-    options: dict | None = None
-    tools_enabled: bool = True
 
 
 def _sse(event: str, data: dict) -> str:
@@ -47,6 +38,7 @@ async def chat(req: ChatRequest) -> StreamingResponse:
         raise HTTPException(404, "session introuvable")
 
     model = req.model or session.get("model") or settings.default_model
+    cfg = agent_config.get_config()
 
     # Premier message : titre la session avec un extrait.
     if not db.list_messages(req.session_id):
@@ -55,7 +47,7 @@ async def chat(req: ChatRequest) -> StreamingResponse:
 
     db.add_message(req.session_id, "user", req.content, None)
 
-    convo = [{"role": "system", "content": SYSTEM_PROMPT}]
+    convo = [{"role": "system", "content": cfg["system_prompt"]}]
     convo += db.list_messages_for_model(req.session_id)
 
     async def event_stream():
@@ -64,7 +56,10 @@ async def chat(req: ChatRequest) -> StreamingResponse:
         tools_meta: list[dict] = []
 
         async for ev in run_agent(
-            model, convo, options=req.options, tools_enabled=req.tools_enabled
+            model,
+            convo,
+            options=agent_config.ollama_options(cfg),
+            enabled_tools=agent_config.enabled_tool_names(cfg),
         ):
             etype = ev.pop("type")
             if etype == "token":
diff --git a/backend/app/routes/config.py b/backend/app/routes/config.py
new file mode 100644
index 0000000..9f11ce0
--- /dev/null
+++ b/backend/app/routes/config.py
@@ -0,0 +1,32 @@
+"""Routes de configuration de l'agent (lecture / mise à jour)."""
+from __future__ import annotations
+
+from fastapi import APIRouter
+from pydantic import BaseModel
+
+from .. import agent_config
+
+router = APIRouter(prefix="/api/config", tags=["config"])
+
+
+class ConfigPatch(BaseModel):
+    system_prompt: str | None = None
+    temperature: float | None = None
+    top_p: float | None = None
+    top_k: int | None = None
+    max_tokens: int | None = None
+    tools: dict[str, bool] | None = None
+
+
+@router.get("")
+async def get_config() -> dict:
+    return {
+        "config": agent_config.get_config(),
+        "available_tools": agent_config.AVAILABLE_TOOLS,
+    }
+
+
+@router.put("")
+async def put_config(patch: ConfigPatch) -> dict:
+    cfg = agent_config.save_config(patch.model_dump(exclude_none=True))
+    return {"config": cfg}
diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index 277d7ab..799c70a 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -9,15 +9,16 @@ import { useStore } from "./store/useStore";
 
 export default function App() {
   const [view, setView] = useState<View>("chat");
-  const { refreshStatus, refreshModels } = useStore();
+  const { refreshStatus, refreshModels, refreshConfig } = useStore();
 
-  // Au démarrage : statut Ollama + liste des modèles. Poll du statut.
+  // Au démarrage : statut Ollama + modèles + config. Poll du statut.
   useEffect(() => {
     refreshStatus();
     refreshModels();
+    refreshConfig();
     const id = setInterval(refreshStatus, 10000);
     return () => clearInterval(id);
-  }, [refreshStatus, refreshModels]);
+  }, [refreshStatus, refreshModels, refreshConfig]);
 
   return (
     <div className="flex h-full flex-col bg-base text-ink">
diff --git a/frontend/src/api/client.ts b/frontend/src/api/client.ts
index 15f9c10..49e429c 100644
--- a/frontend/src/api/client.ts
+++ b/frontend/src/api/client.ts
@@ -55,6 +55,34 @@ export interface Message {
   created_at: number;
 }
 
+export interface AgentConfig {
+  system_prompt: string;
+  temperature: number;
+  top_p: number;
+  top_k: number;
+  max_tokens: number;
+  tools: Record<string, boolean>;
+}
+
+export async function getConfig(): Promise<{
+  config: AgentConfig;
+  available_tools: string[];
+}> {
+  const res = await fetch("/api/config");
+  return res.json();
+}
+
+export async function saveConfig(
+  patch: Partial<AgentConfig>
+): Promise<AgentConfig> {
+  const res = await fetch("/api/config", {
+    method: "PUT",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify(patch),
+  });
+  return (await res.json()).config;
+}
+
 export interface FileNode {
   name: string;
   path: string;
diff --git a/frontend/src/panels/ChatPanel.tsx b/frontend/src/panels/ChatPanel.tsx
index b94b86e..9dfa5f8 100644
--- a/frontend/src/panels/ChatPanel.tsx
+++ b/frontend/src/panels/ChatPanel.tsx
@@ -14,8 +14,13 @@ export function ChatPanel() {
     streamTools,
     sendMessage,
     currentSessionId,
+    config,
   } = useStore();
 
+  const activeTools = config
+    ? Object.values(config.tools).filter(Boolean).length
+    : 0;
+
   const [draft, setDraft] = useState("");
   const scrollRef = useRef<HTMLDivElement>(null);
 
@@ -45,10 +50,15 @@ export function ChatPanel() {
       <div className="flex h-[42px] flex-none items-center gap-2 border-b border-line-soft px-[18px]">
         <Chip>Invite système</Chip>
         <Chip>
-          <span className="h-1.5 w-1.5 rounded-full bg-ok" />3 outils actifs
+          <span className="h-1.5 w-1.5 rounded-full bg-ok" />
+          {activeTools} outil{activeTools > 1 ? "s" : ""} actif
+          {activeTools > 1 ? "s" : ""}
         </Chip>
         <Chip>
-          Température <b className="font-semibold text-[#e7ddcd]">0.7</b>
+          Température{" "}
+          <b className="font-semibold text-[#e7ddcd]">
+            {config ? config.temperature.toFixed(2) : "—"}
+          </b>
         </Chip>
         <div className="flex-1" />
         <span className="font-mono text-[11px] text-muted-4">
diff --git a/frontend/src/panels/SettingsView.tsx b/frontend/src/panels/SettingsView.tsx
index f61080e..f09b3fe 100644
--- a/frontend/src/panels/SettingsView.tsx
+++ b/frontend/src/panels/SettingsView.tsx
@@ -1,12 +1,39 @@
-import { useState } from "react";
+import { useEffect, useState } from "react";
 import { useStore } from "../store/useStore";
 import { pullModel } from "../api/client";
+import type { AgentConfig } from "../api/client";
 import { DownloadIcon, RefreshIcon } from "../components/Icon";
 
+const TOOL_DESC: Record<string, string> = {
+  read_file: "Lire un fichier du projet",
+  write_file: "Créer / modifier un fichier",
+  list_dir: "Lister un répertoire",
+};
+
 /** Vue Configuration (Frame 2) — Modèle & génération, outils, invite système. */
 export function SettingsView() {
-  const { models, selectedModel, setSelectedModel, refreshModels, status } =
-    useStore();
+  const {
+    models,
+    selectedModel,
+    setSelectedModel,
+    refreshModels,
+    status,
+    config,
+    availableTools,
+    refreshConfig,
+    updateConfig,
+  } = useStore();
+
+  // Brouillon local édité, synchronisé depuis la config serveur.
+  const [draft, setDraft] = useState<AgentConfig | null>(config);
+  const [saved, setSaved] = useState(false);
+
+  useEffect(() => {
+    refreshConfig();
+  }, [refreshConfig]);
+  useEffect(() => {
+    if (config) setDraft(config);
+  }, [config]);
 
   const [pullName, setPullName] = useState("");
   const [pullStatus, setPullStatus] = useState<string | null>(null);
@@ -28,6 +55,23 @@ export function SettingsView() {
     }
   };
 
+  const dirty =
+    draft && config && JSON.stringify(draft) !== JSON.stringify(config);
+
+  const save = async () => {
+    if (!draft) return;
+    await updateConfig(draft);
+    setSaved(true);
+    setTimeout(() => setSaved(false), 2000);
+  };
+
+  const set = <K extends keyof AgentConfig>(key: K, value: AgentConfig[K]) =>
+    setDraft((d) => (d ? { ...d, [key]: value } : d));
+
+  const activeTools = draft
+    ? Object.values(draft.tools).filter(Boolean).length
+    : 0;
+
   return (
     <div className="scr flex-1 overflow-auto px-[30px] py-[26px]">
       <div className="mx-auto max-w-[1000px]">
@@ -41,199 +85,243 @@ export function SettingsView() {
               Choisis le modèle local et règle son comportement.
             </div>
           </div>
-          <div className="flex items-center gap-1.5 font-mono text-[11.5px] text-ok">
-            <span className="h-1.5 w-1.5 rounded-full bg-ok" />
-            {status?.connected ? "Ollama connecté" : "Ollama déconnecté"}
+          <div className="flex items-center gap-3">
+            <div className="flex items-center gap-1.5 font-mono text-[11.5px] text-ok">
+              <span className="h-1.5 w-1.5 rounded-full bg-ok" />
+              {status?.connected ? "Ollama connecté" : "Ollama déconnecté"}
+            </div>
+            <button
+              onClick={save}
+              disabled={!dirty}
+              className="flex h-[30px] items-center gap-1.5 rounded-lg bg-accent px-3.5 text-[12.5px] font-bold text-[#1f1b16] disabled:opacity-40"
+            >
+              {saved ? "Enregistré ✓" : dirty ? "Enregistrer" : "À jour"}
+            </button>
           </div>
         </div>
 
-        <div className="grid grid-cols-2 items-start gap-5">
-          {/* Modèle Ollama */}
-          <div className="rounded-card border border-line bg-card p-[18px]">
-            <div className="mb-3.5 flex items-center justify-between">
-              <div className="text-sm font-bold">Modèle Ollama</div>
-              <button
-                onClick={refreshModels}
-                className="flex h-[26px] items-center gap-1.5 rounded-[7px] border border-line-strong bg-base px-2.5 text-[11px] text-muted"
-              >
-                <RefreshIcon size={12} />
-                Actualiser
-              </button>
-            </div>
-
-            <div className="flex flex-col gap-2">
-              {models.length === 0 && (
-                <div className="rounded-[11px] border border-line bg-base p-4 text-center text-xs text-muted-3">
-                  Aucun modèle installé. Télécharge-en un ci-dessous.
-                </div>
-              )}
-              {models.map((m) => {
-                const on = m.name === selectedModel;
-                return (
+        {!draft ? (
+          <div className="py-20 text-center text-muted-3">
+            Chargement de la configuration…
+          </div>
+        ) : (
+          <>
+            <div className="grid grid-cols-2 items-start gap-5">
+              {/* Modèle Ollama */}
+              <div className="rounded-card border border-line bg-card p-[18px]">
+                <div className="mb-3.5 flex items-center justify-between">
+                  <div className="text-sm font-bold">Modèle Ollama</div>
                   <button
-                    key={m.name}
-                    onClick={() => setSelectedModel(m.name)}
-                    className="flex items-center gap-3 rounded-[11px] border p-3 text-left"
-                    style={{
-                      background: on ? "rgba(240,161,92,.10)" : "#1a1714",
-                      borderColor: on ? "rgba(240,161,92,.40)" : "#2c2720",
-                    }}
+                    onClick={refreshModels}
+                    className="flex h-[26px] items-center gap-1.5 rounded-[7px] border border-line-strong bg-base px-2.5 text-[11px] text-muted"
                   >
-                    <span
-                      className="flex h-[18px] w-[18px] items-center justify-center rounded-full border-2"
-                      style={{ borderColor: on ? "#f0a15c" : "#4a443b" }}
-                    >
-                      {on && (
-                        <span className="h-2 w-2 rounded-full bg-accent" />
-                      )}
-                    </span>
-                    <div className="flex-1">
-                      <div className="flex items-center gap-2">
-                        <span className="font-mono text-[13px] font-semibold text-ink">
-                          {m.name}
-                        </span>
-                        {m.name === status?.default_model && (
-                          <span
-                            className="rounded-[5px] px-1.5 py-px text-[10px] font-bold text-accent"
-                            style={{ background: "rgba(240,161,92,.14)" }}
-                          >
-                            PAR DÉFAUT
-                          </span>
-                        )}
-                      </div>
-                      <div className="mt-[3px] font-mono text-[10.5px] text-muted-2">
-                        {[
-                          m.size_go ? `${m.size_go} Go` : null,
-                          m.quantization,
-                          m.parameter_size,
-                          m.family,
-                        ]
-                          .filter(Boolean)
-                          .join(" · ")}
-                      </div>
-                    </div>
+                    <RefreshIcon size={12} />
+                    Actualiser
                   </button>
-                );
-              })}
-            </div>
-
-            <div className="my-4 h-px bg-line" />
-
-            <div className="mb-2.5 text-[11px] font-bold uppercase tracking-[.05em] text-label">
-              Télécharger un modèle
-            </div>
-            <div className="mb-3 flex gap-2">
-              <input
-                value={pullName}
-                onChange={(e) => setPullName(e.target.value)}
-                placeholder="gemma2:9b"
-                className="h-[34px] flex-1 rounded-[9px] border border-line-strong bg-base px-3 font-mono text-xs text-ink outline-none placeholder:text-muted-3"
-              />
-              <button
-                onClick={doPull}
-                className="flex h-[34px] items-center gap-1.5 rounded-[9px] border border-line-strong bg-[#2a251f] px-3.5 text-[12.5px] font-semibold text-[#e7ddcd]"
-              >
-                <DownloadIcon />
-                Récupérer
-              </button>
-            </div>
-
-            {pullStatus && (
-              <div className="rounded-[10px] border border-line bg-base p-3">
-                <div className="mb-2 flex items-center justify-between">
-                  <span className="font-mono text-xs text-ink-2">
-                    {pullName}
-                  </span>
-                  <span className="font-mono text-[11px] text-accent">
-                    {pullStatus} {pullPct ? `· ${pullPct}%` : ""}
-                  </span>
                 </div>
-                <div className="h-1.5 overflow-hidden rounded bg-line">
-                  <div
-                    className="h-full rounded bg-accent-grad transition-all"
-                    style={{ width: `${pullPct}%` }}
+
+                <div className="flex flex-col gap-2">
+                  {models.length === 0 && (
+                    <div className="rounded-[11px] border border-line bg-base p-4 text-center text-xs text-muted-3">
+                      Aucun modèle installé. Télécharge-en un ci-dessous.
+                    </div>
+                  )}
+                  {models.map((m) => {
+                    const on = m.name === selectedModel;
+                    return (
+                      <button
+                        key={m.name}
+                        onClick={() => setSelectedModel(m.name)}
+                        className="flex items-center gap-3 rounded-[11px] border p-3 text-left"
+                        style={{
+                          background: on ? "rgba(240,161,92,.10)" : "#1a1714",
+                          borderColor: on ? "rgba(240,161,92,.40)" : "#2c2720",
+                        }}
+                      >
+                        <span
+                          className="flex h-[18px] w-[18px] items-center justify-center rounded-full border-2"
+                          style={{ borderColor: on ? "#f0a15c" : "#4a443b" }}
+                        >
+                          {on && <span className="h-2 w-2 rounded-full bg-accent" />}
+                        </span>
+                        <div className="flex-1">
+                          <div className="flex items-center gap-2">
+                            <span className="font-mono text-[13px] font-semibold text-ink">
+                              {m.name}
+                            </span>
+                            {m.name === status?.default_model && (
+                              <span
+                                className="rounded-[5px] px-1.5 py-px text-[10px] font-bold text-accent"
+                                style={{ background: "rgba(240,161,92,.14)" }}
+                              >
+                                PAR DÉFAUT
+                              </span>
+                            )}
+                          </div>
+                          <div className="mt-[3px] font-mono text-[10.5px] text-muted-2">
+                            {[
+                              m.size_go ? `${m.size_go} Go` : null,
+                              m.quantization,
+                              m.parameter_size,
+                              m.family,
+                            ]
+                              .filter(Boolean)
+                              .join(" · ")}
+                          </div>
+                        </div>
+                      </button>
+                    );
+                  })}
+                </div>
+
+                <div className="my-4 h-px bg-line" />
+
+                <div className="mb-2.5 text-[11px] font-bold uppercase tracking-[.05em] text-label">
+                  Télécharger un modèle
+                </div>
+                <div className="mb-3 flex gap-2">
+                  <input
+                    value={pullName}
+                    onChange={(e) => setPullName(e.target.value)}
+                    placeholder="gemma2:9b"
+                    className="h-[34px] flex-1 rounded-[9px] border border-line-strong bg-base px-3 font-mono text-xs text-ink outline-none placeholder:text-muted-3"
+                  />
+                  <button
+                    onClick={doPull}
+                    className="flex h-[34px] items-center gap-1.5 rounded-[9px] border border-line-strong bg-[#2a251f] px-3.5 text-[12.5px] font-semibold text-[#e7ddcd]"
+                  >
+                    <DownloadIcon />
+                    Récupérer
+                  </button>
+                </div>
+
+                {pullStatus && (
+                  <div className="rounded-[10px] border border-line bg-base p-3">
+                    <div className="mb-2 flex items-center justify-between">
+                      <span className="font-mono text-xs text-ink-2">
+                        {pullName}
+                      </span>
+                      <span className="font-mono text-[11px] text-accent">
+                        {pullStatus} {pullPct ? `· ${pullPct}%` : ""}
+                      </span>
+                    </div>
+                    <div className="h-1.5 overflow-hidden rounded bg-line">
+                      <div
+                        className="h-full rounded bg-accent-grad transition-all"
+                        style={{ width: `${pullPct}%` }}
+                      />
+                    </div>
+                  </div>
+                )}
+              </div>
+
+              {/* Génération + Outils */}
+              <div className="flex flex-col gap-5">
+                <div className="rounded-card border border-line bg-card p-[18px]">
+                  <div className="mb-4 text-sm font-bold">Génération</div>
+                  <Slider
+                    label="Température"
+                    value={draft.temperature}
+                    min={0}
+                    max={2}
+                    step={0.05}
+                    fmt={(v) => v.toFixed(2)}
+                    onChange={(v) => set("temperature", v)}
+                  />
+                  <Slider
+                    label="Top-P"
+                    value={draft.top_p}
+                    min={0}
+                    max={1}
+                    step={0.05}
+                    fmt={(v) => v.toFixed(2)}
+                    onChange={(v) => set("top_p", v)}
+                  />
+                  <Slider
+                    label="Top-K"
+                    value={draft.top_k}
+                    min={1}
+                    max={100}
+                    step={1}
+                    fmt={(v) => String(Math.round(v))}
+                    onChange={(v) => set("top_k", Math.round(v))}
+                  />
+                  <Slider
+                    label="Jetons max"
+                    value={draft.max_tokens}
+                    min={256}
+                    max={8192}
+                    step={128}
+                    fmt={(v) => String(Math.round(v))}
+                    onChange={(v) => set("max_tokens", Math.round(v))}
+                    last
                   />
                 </div>
-              </div>
-            )}
-          </div>
 
-          {/* Génération + Outils */}
-          <div className="flex flex-col gap-5">
-            <div className="rounded-card border border-line bg-card p-[18px]">
-              <div className="mb-4 text-sm font-bold">Génération</div>
-              <Slider label="Température" value="0.7" pct={35} />
-              <Slider label="Top-P" value="0.90" pct={90} />
-              <Slider label="Top-K" value="40" pct={40} />
-              <Slider label="Jetons max" value="2048" pct={25} last />
+                <div className="rounded-card border border-line bg-card p-[18px]">
+                  <div className="mb-3.5 flex items-center justify-between">
+                    <div className="text-sm font-bold">Outils de l'agent</div>
+                    <span className="font-mono text-[11px] text-muted-2">
+                      {activeTools} / {availableTools.length} actifs
+                    </span>
+                  </div>
+                  {availableTools.map((name, i) => {
+                    const on = draft.tools[name] ?? false;
+                    return (
+                      <div
+                        key={name}
+                        className={`flex items-center gap-3 py-[9px] ${
+                          i > 0 ? "border-t border-line-soft" : ""
+                        }`}
+                      >
+                        <span className="w-32 flex-none font-mono text-[12.5px] text-ink-2">
+                          {name}
+                        </span>
+                        <span className="flex-1 text-xs text-muted-2">
+                          {TOOL_DESC[name] ?? ""}
+                        </span>
+                        <button
+                          onClick={() =>
+                            set("tools", { ...draft.tools, [name]: !on })
+                          }
+                          className="relative h-5 w-[34px] rounded-full transition-colors"
+                          style={{ background: on ? "#f0a15c" : "#3a342c" }}
+                        >
+                          <span
+                            className="absolute top-0.5 h-4 w-4 rounded-full transition-all"
+                            style={{
+                              background: on ? "#1f1b16" : "#6f675c",
+                              left: on ? 16 : 2,
+                            }}
+                          />
+                        </button>
+                      </div>
+                    );
+                  })}
+                  <div className="mt-1 border-t border-line-soft pt-2.5 font-mono text-[11px] text-muted-3">
+                    web_search · run_shell — arrivent bientôt (sensibles)
+                  </div>
+                </div>
+              </div>
             </div>
 
-            <div className="rounded-card border border-line bg-card p-[18px]">
-              <div className="mb-3.5 flex items-center justify-between">
-                <div className="text-sm font-bold">Outils de l'agent</div>
+            {/* Invite système */}
+            <div className="mt-5 rounded-card border border-line bg-card p-[18px]">
+              <div className="mb-3 flex items-center justify-between">
+                <div className="text-sm font-bold">Invite système</div>
                 <span className="font-mono text-[11px] text-muted-2">
-                  bientôt
+                  {draft.system_prompt.length} caractères
                 </span>
               </div>
-              {[
-                ["read_file", "Lire un fichier du projet", true],
-                ["write_file", "Créer / modifier un fichier", true],
-                ["list_dir", "Lister un répertoire", true],
-                ["html_preview", "Aperçu HTML en direct", true],
-                ["web_search", "Recherche web", false],
-                ["run_shell", "Exécuter une commande · sensible", false],
-              ].map(([name, desc, on], i) => (
-                <div
-                  key={name as string}
-                  className={`flex items-center gap-3 py-[9px] ${
-                    i > 0 ? "border-t border-line-soft" : ""
-                  }`}
-                >
-                  <span className="w-32 flex-none font-mono text-[12.5px] text-ink-2">
-                    {name}
-                  </span>
-                  <span className="flex-1 text-xs text-muted-2">{desc}</span>
-                  <span
-                    className="relative h-5 w-[34px] rounded-full"
-                    style={{ background: on ? "#f0a15c" : "#3a342c" }}
-                  >
-                    <span
-                      className="absolute top-0.5 h-4 w-4 rounded-full"
-                      style={{
-                        background: on ? "#1f1b16" : "#6f675c",
-                        left: on ? "auto" : "2px",
-                        right: on ? "2px" : "auto",
-                      }}
-                    />
-                  </span>
-                </div>
-              ))}
+              <textarea
+                value={draft.system_prompt}
+                onChange={(e) => set("system_prompt", e.target.value)}
+                rows={6}
+                className="scr w-full resize-y rounded-[10px] border border-line bg-sunken p-4 font-mono text-[12.5px] leading-[1.7] text-ink-3 outline-none focus:border-line-strong"
+              />
             </div>
-          </div>
-        </div>
-
-        {/* Invite système */}
-        <div className="mt-5 rounded-card border border-line bg-card p-[18px]">
-          <div className="mb-3 flex items-center justify-between">
-            <div className="text-sm font-bold">Invite système</div>
-            <span className="font-mono text-[11px] text-muted-2">
-              éditeur à venir
-            </span>
-          </div>
-          <div className="rounded-[10px] border border-line bg-sunken p-4 font-mono text-[12.5px] leading-[1.7] text-ink-3">
-            <span className="text-ok"># Rôle</span>
-            <br />
-            Tu es un assistant de développement local. Tu travailles dans le
-            dossier <span className="text-accent">workspace/</span> et tu écris
-            du code clair, commenté en français.
-            <br />
-            <br />
-            <span className="text-ok"># Règles</span>
-            <br />
-            — Demande confirmation avant toute commande shell.
-            <br />— Après chaque écriture de fichier, propose un aperçu.
-          </div>
-        </div>
+          </>
+        )}
       </div>
     </div>
   );
@@ -242,31 +330,52 @@ export function SettingsView() {
 function Slider({
   label,
   value,
-  pct,
+  min,
+  max,
+  step,
+  fmt,
+  onChange,
   last,
 }: {
   label: string;
-  value: string;
-  pct: number;
+  value: number;
+  min: number;
+  max: number;
+  step: number;
+  fmt: (v: number) => string;
+  onChange: (v: number) => void;
   last?: boolean;
 }) {
+  const pct = ((value - min) / (max - min)) * 100;
   return (
     <div className={last ? "" : "mb-4"}>
       <div className="mb-2 flex items-center justify-between">
         <span className="text-[13px] text-ink-2">{label}</span>
         <span className="font-mono text-xs font-semibold text-accent">
-          {value}
+          {fmt(value)}
         </span>
       </div>
-      <div className="relative h-1.5 rounded bg-line">
+      <div className="relative h-4">
+        {/* Piste + remplissage + pouce (visuel fidèle) */}
+        <div className="absolute top-1/2 h-1.5 w-full -translate-y-1/2 rounded bg-line" />
         <div
-          className="absolute left-0 top-0 h-1.5 rounded bg-accent"
+          className="absolute top-1/2 h-1.5 -translate-y-1/2 rounded bg-accent"
           style={{ width: `${pct}%` }}
         />
         <div
           className="absolute top-1/2 h-4 w-4 -translate-x-1/2 -translate-y-1/2 rounded-full border-[3px] border-card bg-accent"
           style={{ left: `${pct}%` }}
         />
+        {/* Input réel transparent par-dessus */}
+        <input
+          type="range"
+          min={min}
+          max={max}
+          step={step}
+          value={value}
+          onChange={(e) => onChange(parseFloat(e.target.value))}
+          className="absolute inset-0 h-full w-full cursor-pointer opacity-0"
+        />
       </div>
     </div>
   );
diff --git a/frontend/src/store/useStore.ts b/frontend/src/store/useStore.ts
index 428bc2b..45ce7e4 100644
--- a/frontend/src/store/useStore.ts
+++ b/frontend/src/store/useStore.ts
@@ -2,13 +2,16 @@ import { create } from "zustand";
 import {
   createSession,
   deleteSession,
+  getConfig,
   getModels,
   getSession,
   getStatus,
   fileContent,
   listFiles,
   listSessions,
+  saveConfig,
   streamChat,
+  type AgentConfig,
   type FileNode,
   type Message,
   type OllamaModel,
@@ -34,6 +37,11 @@ interface LokiState {
   previewPath: string | null;
   previewContent: string;
 
+  config: AgentConfig | null;
+  availableTools: string[];
+  refreshConfig: () => Promise<void>;
+  updateConfig: (patch: Partial<AgentConfig>) => Promise<void>;
+
   openPreview: (path: string) => Promise<void>;
   setSelectedModel: (name: string) => void;
   refreshStatus: () => Promise<void>;
@@ -62,6 +70,18 @@ export const useStore = create<LokiState>((set, get) => ({
   fileTree: [],
   previewPath: null,
   previewContent: "",
+  config: null,
+  availableTools: [],
+
+  refreshConfig: async () => {
+    const { config, available_tools } = await getConfig();
+    set({ config, availableTools: available_tools });
+  },
+
+  updateConfig: async (patch) => {
+    const config = await saveConfig(patch);
+    set({ config });
+  },
 
   openPreview: async (path) => {
     const content = await fileContent(path);