diff --git a/backend/internal/adapter/llm/anyllm.go b/backend/internal/adapter/llm/anyllm.go
index f39c0ee..864e03a 100644
--- a/backend/internal/adapter/llm/anyllm.go
+++ b/backend/internal/adapter/llm/anyllm.go
@@ -2,6 +2,7 @@ package llm
 
 import (
 	"context"
+
 	"fmt"
 	"log/slog"
 
diff --git a/backend/internal/service/chat/session.go b/backend/internal/service/chat/session.go
index 7d08761..c44569f 100644
--- a/backend/internal/service/chat/session.go
+++ b/backend/internal/service/chat/session.go
@@ -2,11 +2,15 @@ package chat
 
 import (
 	"context"
+	_ "embed"
 	"sync"
 
 	"trankilou.fr/lassistanoque/backend/internal/domain"
 )
 
+//go:embed system_prompt.md
+var systemSystemPrompt string
+
 type ChatSession struct {
 	userID      string
 	teamID      string
@@ -43,7 +47,7 @@ func (s *ChatSession) run(ctx context.Context) error {
 
 	systemPrompt := &domain.Message{
 		Role:    string(domain.RoleSystem),
-		Content: s.agent.SystemPrompt,
+		Content: systemSystemPrompt + "\n\n## Customization\n\n" + s.agent.SystemPrompt,
 	}
 
 	continue_loop := true
diff --git a/backend/internal/service/chat/system_prompt.md b/backend/internal/service/chat/system_prompt.md
new file mode 100644
index 0000000..7fc1016
--- /dev/null
+++ b/backend/internal/service/chat/system_prompt.md
@@ -0,0 +1,27 @@
+You are an assistant that helps users by relying on the tools and skills made available to you. Reply in the user's language.
+
+## Style: be direct
+
+Answer precisely and concisely. Start with the answer, with no preamble, no restating of the question, and no summarizing conclusion.
+
+Match the length to the actual need: a simple question calls for a short answer, a complex one may justify more development. Don't digress and don't add information the user didn't ask for, unless it is essential to keep them from making a mistake. If the answer fits in one sentence, one sentence is enough.
+
+Conciseness applies to style, never at the expense of the completeness the user asked for.
+
+## Reliability: never invent anything
+
+Only state what you know for certain or have verified. If you have any doubt about a fact, figure, name, date, or the current state of a system, check the tools before answering: they are your source of truth, your memory is not.
+
+If the tools cannot confirm a piece of information, say so clearly ("I couldn't verify this", "the tools returned no results") rather than filling the gap with a guess. Always distinguish what is established by a source from what is your own inference, and flag it when it is the latter. Saying "I don't know" is always better than giving an invented answer.
+
+## Perseverance: see it through
+
+When the user asks for a complete or exhaustive list, or for any task whose result must be whole, don't settle for a first, partial result. Check whether results are paginated or truncated, rerun the tools with other parameters, pages, or queries, and cross-check sources until you have covered the requested scope.
+
+Never present a partial result as complete. If, despite your efforts, you cannot guarantee completeness (tool limitation, inaccessible source), state precisely what is missing or could not be verified. If a tool fails or returns an unusable result, try another approach before concluding.
+
+## Tools and skills
+
+Use the available tools and skills whenever they can help you answer more accurately, verify a fact, or complete the task. Don't answer from memory when a tool can provide the answer. If several tools are relevant, combine them. When a task matches an available skill, consult it before starting.
+
+You may skip them for purely conversational exchanges or questions whose answer depends on no information that needs verifying.
diff --git a/backend/lassistanoque.db-wal b/backend/lassistanoque.db-wal
index eef948f..b11e179 100644
Binary files a/backend/lassistanoque.db-wal and b/backend/lassistanoque.db-wal differ
diff --git a/backend/web/src/routes/(authenticated)/[space]/(chat)/[conversation]/+page.svelte b/backend/web/src/routes/(authenticated)/[space]/(chat)/[conversation]/+page.svelte
index b181b6c..a0c14ec 100644
--- a/backend/web/src/routes/(authenticated)/[space]/(chat)/[conversation]/+page.svelte
+++ b/backend/web/src/routes/(authenticated)/[space]/(chat)/[conversation]/+page.svelte
@@ -1,6 +1,6 @@
 <script lang="ts">
     import {autofocus} from "$lib/ui/autofocus"
-	import { onMount } from "svelte"
+	import {onMount, tick } from "svelte"
 	import {page} from "$app/state"
 	import {chatApi} from "$lib/api/endpoints/chat"
 	import type { PageProps } from './$types';
@@ -20,9 +20,12 @@
         let chatWithMessage : ChatWithMessages = await chatApi.getChat(data.spaceId, data.chatId)
         messages = chatWithMessage.messages
       }
+      await tick()
+      historyDiv.scrollTop = historyDiv.scrollHeight;
     })
 
     let historyDiv: HTMLDivElement;
+    let inputPrompt: HTMLDivElement;
 
     const sendRequest = async(theprompt:string) => {
       prompt = ""
@@ -34,6 +37,12 @@
         if (waiting && chunk.role==="assistant") {
           waiting = false
         }
+        if (chunk.done) {
+          document
+              .querySelectorAll<HTMLDivElement>('div.reasoning:not(.hidden)')
+              .forEach((el) => el.classList.add('hidden'));
+          return
+        }
 
         if (chunk.role!=lastrole || chunk.toolName!=lastToolName) {
           const currentDate = new Date()
@@ -80,7 +89,9 @@
     }
 
     const handleOnSubmit = async ()=>{
+      historyDiv.scrollTop = historyDiv.scrollHeight;
       await sendRequest(prompt)
+      inputPrompt.focus()
     }
 </script>
 
@@ -94,7 +105,7 @@
                 </div>
                 {/if}
                 {#if message.toolcalls != null && message.toolcalls.length>0}
-                    <div class="text-green-600">⚒️ Appel de l'outil {message.toolcalls[0].Function.Name}</div>
+                    <div class="tool text-sm mt-2 py-1 px-2 rounded">⚒️ Appel de l'outil {message.toolcalls[0].Function.Name}</div>
                 {:else}
                     <div class="message-content">
                         <SvelteMarkdown source={message.content} streaming={true}/>
@@ -114,6 +125,7 @@
                placeholder="..."
                bind:value={prompt}
                use:autofocus
+               bind:this={inputPrompt}
             />
            <button class="chatbutton">Go</button>
        </form>
diff --git a/backend/web/src/routes/layout.css b/backend/web/src/routes/layout.css
index aee9c9f..7019523 100644
--- a/backend/web/src/routes/layout.css
+++ b/backend/web/src/routes/layout.css
@@ -275,10 +275,54 @@ h2 {
 /*  chat */
 
 .message {
-	@apply rounded p-2;
+	/*@apply rounded p-2;*/
 
 	&.user {
-		@apply bg-sky-700 dark:text-white;
+		@apply bg-sky-500/20 px-2 py-1 text-sky-700 dark:text-sky-300;
+	}
+	.tool {
+		@apply bg-green-500/20 px-2 py-1 text-green-700 dark:text-green-300;
+	}
+
+	hr {
+		@apply my-4;
+	}
+
+	ul,
+	ol {
+		@apply my-2;
+	}
+
+	h1 {
+		@apply text-2xl font-bold;
+	}
+
+	h2 {
+		@apply text-xl font-bold;
+	}
+
+	h3 {
+		@apply text-lg font-bold;
+	}
+
+	h4 {
+		@apply text-base;
+	}
+
+	h5 {
+		@apply text-sm;
+	}
+
+	li {
+		@apply ml-5 list-disc pl-4 marker:text-xl;
+	}
+
+	pre {
+		@apply my-2 rounded p-1 whitespace-pre dark:bg-stone-700;
+	}
+
+	p {
+		@apply my-2;
 	}
 }
 
@@ -289,11 +333,3 @@ h2 {
 		@apply text-white/50;
 	}
 }
-
-.message-content p {
-	@apply my-2;
-}
-
-.message-content pre {
-	@apply my-2 whitespace-pre dark:bg-stone-700;
-}