feat: Anweisungen-Feld für Agents mit EasyMDE-Editor

- AgentRecord: TaskInstruction (string, nullable)
- DB-Migration: task_instruction TEXT Spalte
- AgentEndpoint: Create/Update lesen taskInstruction
- SystemPromptBuilder: '## Anweisungen' Block nach Soul, nur wenn nicht leer
- HTML: Textarea #agentTaskInstruction nach Rückfragen-Checkbox
- agent-page.js: EasyMDE-Editor mit Init, Laden, Speichern, Destroy

Endpoints/AgentEndpoint.cs

@@ -66,6 +66,7 @@ public static class AgentEndpoint
             UseWebSearch = body.TryGetProperty("webSearchVersion", out var wsv) && !string.IsNullOrEmpty(wsv.GetString()),
             WebSearchVersion = body.TryGetProperty("webSearchVersion", out var wsv2) ? wsv2.GetString() ?? "" : "",
             AllowUserChoice = !body.TryGetProperty("allowUserChoice", out var auc) || auc.GetBoolean(),
+            TaskInstruction = body.TryGetProperty("taskInstruction", out var ti) ? ti.GetString() : null,
             AvatarScale = body.TryGetProperty("avatarScale", out var asc) ? asc.GetDouble() : 1.0,
             AvatarOffsetX = body.TryGetProperty("avatarOffsetX", out var aox) ? aox.GetDouble() : 0,
             AvatarOffsetY = body.TryGetProperty("avatarOffsetY", out var aoy) ? aoy.GetDouble() : 0
@@ -105,6 +106,7 @@ public static class AgentEndpoint
             agent.UseWebSearch = !string.IsNullOrEmpty(agent.WebSearchVersion);
         }
         if (body.TryGetProperty("allowUserChoice", out var auc)) agent.AllowUserChoice = auc.GetBoolean();
+        if (body.TryGetProperty("taskInstruction", out var ti)) agent.TaskInstruction = ti.GetString();
         if (body.TryGetProperty("avatarScale", out var asc)) agent.AvatarScale = asc.GetDouble();
         if (body.TryGetProperty("avatarOffsetX", out var aox)) agent.AvatarOffsetX = aox.GetDouble();
         if (body.TryGetProperty("avatarOffsetY", out var aoy)) agent.AvatarOffsetY = aoy.GetDouble();

Models/AgentRecord.cs

@@ -18,6 +18,7 @@ public class AgentRecord
     public bool UseWebSearch { get; set; }
     public string WebSearchVersion { get; set; } = "";
     public bool AllowUserChoice { get; set; } = true;
+    public string TaskInstruction { get; set; }
     public double AvatarScale { get; set; } = 1.0;
     public double AvatarOffsetX { get; set; }
     public double AvatarOffsetY { get; set; }

Services/DatabaseService.cs

@@ -179,6 +179,7 @@ public class DatabaseService
         TryAddColumn(conn, "agents", "avatar_offset_y", "REAL NOT NULL DEFAULT 0");
         TryAddColumn(conn, "sessions", "finalizer_agent_id", "TEXT");
         TryAddColumn(conn, "agents", "allow_user_choice", "INTEGER NOT NULL DEFAULT 1");
+        TryAddColumn(conn, "agents", "task_instruction", "TEXT");
         TryAddColumn(conn, "chains", "plan_mode", "INTEGER NOT NULL DEFAULT 0");
         TryAddColumn(conn, "sessions", "preparer_agent_id", "TEXT");
         TryAddColumn(conn, "messages", "tag", "TEXT");
@@ -334,8 +335,8 @@ public class DatabaseService
         agent.CreatedAt = now;
         agent.UpdatedAt = now;
         await conn.ExecuteAsync(@"
-            INSERT INTO agents (agent_id, user_id, name, avatar, description, model, tool_choice, custom_commands, auto_commit, use_soul, use_identity, use_user_info, use_memory, use_web_search, web_search_version, allow_user_choice, avatar_scale, avatar_offset_x, avatar_offset_y, is_deleted, created_at, updated_at)
+            INSERT INTO agents (agent_id, user_id, name, avatar, description, model, tool_choice, custom_commands, auto_commit, use_soul, use_identity, use_user_info, use_memory, use_web_search, web_search_version, allow_user_choice, task_instruction, avatar_scale, avatar_offset_x, avatar_offset_y, is_deleted, created_at, updated_at)
-            VALUES (@AgentId, @UserId, @Name, @Avatar, @Description, @Model, @ToolChoice, @CustomCommands, @AutoCommit, @UseSoul, @UseIdentity, @UseUserInfo, @UseMemory, @UseWebSearch, @WebSearchVersion, @AllowUserChoice, @AvatarScale, @AvatarOffsetX, @AvatarOffsetY, 0, @CreatedAt, @UpdatedAt)
+            VALUES (@AgentId, @UserId, @Name, @Avatar, @Description, @Model, @ToolChoice, @CustomCommands, @AutoCommit, @UseSoul, @UseIdentity, @UseUserInfo, @UseMemory, @UseWebSearch, @WebSearchVersion, @AllowUserChoice, @TaskInstruction, @AvatarScale, @AvatarOffsetX, @AvatarOffsetY, 0, @CreatedAt, @UpdatedAt)
         ", agent);
         return agent;
     }
@@ -363,7 +364,7 @@ public class DatabaseService
                 model = @Model, tool_choice = @ToolChoice,
                 custom_commands = @CustomCommands, auto_commit = @AutoCommit,
                 use_soul = @UseSoul, use_identity = @UseIdentity, use_user_info = @UseUserInfo, use_memory = @UseMemory, use_web_search = @UseWebSearch, web_search_version = @WebSearchVersion,
-                allow_user_choice = @AllowUserChoice,
+                allow_user_choice = @AllowUserChoice, task_instruction = @TaskInstruction,
                 avatar_scale = @AvatarScale, avatar_offset_x = @AvatarOffsetX, avatar_offset_y = @AvatarOffsetY, updated_at = @UpdatedAt
             WHERE agent_id = @AgentId AND user_id = @UserId
         ", agent);

Services/SystemPromptBuilder.cs

@@ -39,6 +39,12 @@ public static class SystemPromptBuilder
                 blocks.Add(new PromptBlock { Icon = "fa-heart", Label = "Agent · SOUL.md (UseSoul)", Content = soul });
         }
 
+        // Anweisungen
+        if (!string.IsNullOrWhiteSpace(agent.TaskInstruction))
+        {
+            blocks.Add(new PromptBlock { Icon = "fa-clipboard", Label = "Agent · Anweisungen", Content = $"## Anweisungen\n{agent.TaskInstruction.Trim()}" });
+        }
+
         // User-Info: Persona aus dem Profil des Users der gerade schreibt
         if (agent.UseUserInfo && !string.IsNullOrWhiteSpace(userPersona))
         {

wwwroot/index.html

@@ -199,9 +199,11 @@
               Tool-Nutzung erzwingen <span class="checkbox-hint">(tool_choice: any)</span>
             </label>
             <label class="checkbox-label">
-              <input type="checkbox" id="agentAllowUserChoice">
+              <input type="checkbox" id="agentAllowUserChoice" checked>
               Rückfragen erlauben <span class="checkbox-hint">(ask_user_choice Tool)</span>
             </label>
+            <label>Anweisungen <small>(optional)</small></label>
+            <textarea id="agentTaskInstruction" rows="4" placeholder="Spezifische Anweisungen für diesen Agent (Markdown, optional)"></textarea>
             <label>Git-Commit-Verhalten</label>
             <select id="agentAutoCommit">
               <option value="">Nicht erwähnen</option>

wwwroot/js/pages/agent-page.js

@@ -1,6 +1,7 @@
 // ── Agent Page ──
 
 let _agentAvatarEditor = null;
+let _agentTaskMde = null;
 
 registerPage('agent', {
   async init(params) {
@@ -44,6 +45,21 @@ registerPage('agent', {
       initialOffsetY: (agent && agent.avatarOffsetY) || 0
     });
 
+    // EasyMDE für Task-Instruction
+    const taskEl = document.getElementById('agentTaskInstruction');
+    _agentTaskMde = new EasyMDE({
+      element: taskEl,
+      toolbar: ['bold', 'italic', 'heading', '|', 'quote', 'unordered-list', 'ordered-list', '|', 'link', 'code', '|', 'preview', 'guide'],
+      status: false,
+      autofocus: false,
+      spellChecker: false,
+      autoDownloadFontAwesome: false,
+      placeholder: 'Spezifische Anweisungen für diesen Agent (Markdown, optional)',
+      minHeight: '120px'
+    });
+    _agentTaskMde.codemirror.setOption('theme', 'default');
+    _agentTaskMde.codemirror.getWrapperElement().closest('.EasyMDEContainer').classList.add('fe-mde-wrap');
+
     if (agent) {
       title.textContent = agent.name;
       nameEl.value = agent.name || '';
@@ -51,6 +67,7 @@ registerPage('agent', {
       modelEl.value = agent.model || 'sonnet';
       toolChoiceEl.checked = (agent.toolChoice || 'any') === 'any';
       allowUserChoiceEl.checked = agent.allowUserChoice !== false;
+      _agentTaskMde.value(agent.taskInstruction || '');
       autoCommitEl.value = agent.autoCommit || '';
       useSoulEl.checked = agent.useSoul !== false;
       useIdentityEl.checked = agent.useIdentity !== false;
@@ -107,7 +124,8 @@ registerPage('agent', {
         avatarScale: _agentAvatarEditor.getScale(),
         avatarOffsetX: _agentAvatarEditor.getOffsetX(),
         avatarOffsetY: _agentAvatarEditor.getOffsetY(),
-        customCommands: getCommandsFromUI(commandsList)
+        customCommands: getCommandsFromUI(commandsList),
+        taskInstruction: _agentTaskMde ? _agentTaskMde.value().trim() || null : null
       };
 
       if (isNew) {
@@ -137,6 +155,10 @@ registerPage('agent', {
     });
   },
   destroy() {
+    if (_agentTaskMde) {
+      try { _agentTaskMde.toTextArea(); } catch (_) {}
+      _agentTaskMde = null;
+    }
     if (_agentAvatarEditor) {
       _agentAvatarEditor.destroy();
       _agentAvatarEditor = null;