diff --git a/components/canvas/nodes/agent-node.tsx b/components/canvas/nodes/agent-node.tsx
index 8d283ad..3305d91 100644
--- a/components/canvas/nodes/agent-node.tsx
+++ b/components/canvas/nodes/agent-node.tsx
@@ -5,6 +5,8 @@ import { Bot } from "lucide-react";
 import { Handle, Position, type Node, type NodeProps } from "@xyflow/react";
 import { useAction } from "convex/react";
 import type { FunctionReference } from "convex/server";
+import { useTranslations } from "next-intl";
+import { useLocale } from "next-intl";
 
 import { api } from "@/convex/_generated/api";
 import type { Id } from "@/convex/_generated/dataModel";
@@ -37,6 +39,13 @@ type AgentNodeData = {
   templateId?: string;
   canvasId?: string;
   modelId?: string;
+  briefConstraints?: {
+    briefing?: string;
+    audience?: string;
+    tone?: string;
+    targetChannels?: string[];
+    hardConstraints?: string[];
+  };
   executionSteps?: Array<{ stepIndex?: number; stepTotal?: number }>;
   executionStepIndex?: number;
   executionStepTotal?: number;
@@ -48,6 +57,14 @@ type AgentNodeData = {
   _statusMessage?: string;
 };
 
+type AgentBriefConstraints = {
+  briefing: string;
+  audience: string;
+  tone: string;
+  targetChannels: string[];
+  hardConstraints: string[];
+};
+
 type AgentNodeType = Node<AgentNodeData, "agent">;
 
 const DEFAULT_AGENT_TEMPLATE_ID = "campaign-distributor";
@@ -114,6 +131,46 @@ function areAnswerMapsEqual(
   return true;
 }
 
+function normalizeDelimitedList(value: string, allowNewLines = false): string[] {
+  const separator = allowNewLines ? /[\n,]/ : /,/;
+  return value
+    .split(separator)
+    .map((item) => item.trim())
+    .filter((item) => item.length > 0);
+}
+
+function normalizeBriefConstraints(raw: AgentNodeData["briefConstraints"]): AgentBriefConstraints {
+  return {
+    briefing: typeof raw?.briefing === "string" ? raw.briefing : "",
+    audience: typeof raw?.audience === "string" ? raw.audience : "",
+    tone: typeof raw?.tone === "string" ? raw.tone : "",
+    targetChannels: Array.isArray(raw?.targetChannels)
+      ? raw.targetChannels.filter((item): item is string => typeof item === "string")
+      : [],
+    hardConstraints: Array.isArray(raw?.hardConstraints)
+      ? raw.hardConstraints.filter((item): item is string => typeof item === "string")
+      : [],
+  };
+}
+
+function areStringArraysEqual(left: string[], right: string[]): boolean {
+  if (left.length !== right.length) {
+    return false;
+  }
+
+  return left.every((value, index) => value === right[index]);
+}
+
+function areBriefConstraintsEqual(left: AgentBriefConstraints, right: AgentBriefConstraints): boolean {
+  return (
+    left.briefing === right.briefing &&
+    left.audience === right.audience &&
+    left.tone === right.tone &&
+    areStringArraysEqual(left.targetChannels, right.targetChannels) &&
+    areStringArraysEqual(left.hardConstraints, right.hardConstraints)
+  );
+}
+
 function CompactList({ items }: { items: readonly string[] }) {
   return (
     <ul className="space-y-1">
@@ -127,6 +184,8 @@ function CompactList({ items }: { items: readonly string[] }) {
 }
 
 export default function AgentNode({ id, data, selected }: NodeProps<AgentNodeType>) {
+  const t = useTranslations("agentNode");
+  const locale = useLocale();
   const nodeData = data as AgentNodeData;
   const template =
     getAgentTemplate(nodeData.templateId ?? DEFAULT_AGENT_TEMPLATE_ID) ??
@@ -140,6 +199,9 @@ export default function AgentNode({ id, data, selected }: NodeProps<AgentNodeTyp
   const [clarificationAnswers, setClarificationAnswers] = useState<AgentClarificationAnswerMap>(
     normalizeClarificationAnswers(nodeData.clarificationAnswers),
   );
+  const [briefConstraints, setBriefConstraints] = useState<AgentBriefConstraints>(
+    normalizeBriefConstraints(nodeData.briefConstraints),
+  );
 
   const agentActionsApi = api as unknown as {
     agents: {
@@ -150,6 +212,7 @@ export default function AgentNode({ id, data, selected }: NodeProps<AgentNodeTyp
           canvasId: Id<"canvases">;
           nodeId: Id<"nodes">;
           modelId: string;
+          locale: "de" | "en";
         },
         unknown
       >;
@@ -160,6 +223,7 @@ export default function AgentNode({ id, data, selected }: NodeProps<AgentNodeTyp
           canvasId: Id<"canvases">;
           nodeId: Id<"nodes">;
           clarificationAnswers: AgentClarificationAnswerMap;
+          locale: "de" | "en";
         },
         unknown
       >;
@@ -168,6 +232,7 @@ export default function AgentNode({ id, data, selected }: NodeProps<AgentNodeTyp
 
   const runAgent = useSafeAction(agentActionsApi.agents.runAgent);
   const resumeAgent = useSafeAction(agentActionsApi.agents.resumeAgent);
+  const normalizedLocale = locale === "en" ? "en" : "de";
 
   useEffect(() => {
     setModelId(nodeData.modelId ?? DEFAULT_AGENT_MODEL_ID);
@@ -183,6 +248,16 @@ export default function AgentNode({ id, data, selected }: NodeProps<AgentNodeTyp
     });
   }, [nodeData.clarificationAnswers]);
 
+  useEffect(() => {
+    const normalized = normalizeBriefConstraints(nodeData.briefConstraints);
+    setBriefConstraints((current) => {
+      if (areBriefConstraintsEqual(current, normalized)) {
+        return current;
+      }
+      return normalized;
+    });
+  }, [nodeData.briefConstraints]);
+
   useEffect(() => {
     if (availableModels.length === 0) {
       return;
@@ -202,6 +277,14 @@ export default function AgentNode({ id, data, selected }: NodeProps<AgentNodeTyp
   const resolvedModelId = selectedModel?.id ?? DEFAULT_AGENT_MODEL_ID;
   const creditCost = selectedModel?.creditCost ?? 0;
   const clarificationQuestions = nodeData.clarificationQuestions ?? [];
+  const templateName =
+    template?.id === "campaign-distributor"
+      ? t("templates.campaignDistributor.name")
+      : (template?.name ?? "");
+  const templateDescription =
+    template?.id === "campaign-distributor"
+      ? t("templates.campaignDistributor.description")
+      : (template?.description ?? "");
   const isExecutionActive = nodeData._status === "analyzing" || nodeData._status === "executing";
   const executionProgressLine = useMemo(() => {
     if (nodeData._status !== "executing") {
@@ -230,14 +313,19 @@ export default function AgentNode({ id, data, selected }: NodeProps<AgentNodeTyp
       stepTotalCandidate > 0;
 
     if (hasExecutionNumbers) {
-      return `Executing step ${Math.max(0, Math.floor(stepIndexCandidate)) + 1}/${Math.floor(stepTotalCandidate)}`;
+      return t("executingStepFallback", {
+        current: Math.max(0, Math.floor(stepIndexCandidate)) + 1,
+        total: Math.floor(stepTotalCandidate),
+      });
     }
 
     if (totalFromSteps > 0) {
-      return `Executing planned outputs (${totalFromSteps} total)`;
+      return t("executingPlannedTotalFallback", {
+        total: totalFromSteps,
+      });
     }
 
-    return "Executing planned outputs";
+    return t("executingPlannedFallback");
   }, [
     nodeData._executionStepIndex,
     nodeData._executionStepTotal,
@@ -246,8 +334,25 @@ export default function AgentNode({ id, data, selected }: NodeProps<AgentNodeTyp
     nodeData.executionStepIndex,
     nodeData.executionStepTotal,
     nodeData.executionSteps,
+    t,
   ]);
 
+  const resolveClarificationPrompt = useCallback(
+    (question: AgentClarificationQuestion) => {
+      if (question.id === "briefing") {
+        return t("clarificationPrompts.briefing");
+      }
+      if (question.id === "target-channels") {
+        return t("clarificationPrompts.targetChannels");
+      }
+      if (question.id === "incoming-context") {
+        return t("clarificationPrompts.incomingContext");
+      }
+      return question.prompt;
+    },
+    [t],
+  );
+
   const persistNodeData = useCallback(
     (patch: Partial<AgentNodeData>) => {
       const raw = data as Record<string, unknown>;
@@ -288,6 +393,20 @@ export default function AgentNode({ id, data, selected }: NodeProps<AgentNodeTyp
     [persistNodeData],
   );
 
+  const handleBriefConstraintsChange = useCallback(
+    (patch: Partial<AgentBriefConstraints>) => {
+      setBriefConstraints((prev) => {
+        const next = {
+          ...prev,
+          ...patch,
+        };
+        void persistNodeData({ briefConstraints: next });
+        return next;
+      });
+    },
+    [persistNodeData],
+  );
+
   const handleRunAgent = useCallback(async () => {
     if (isExecutionActive) {
       return;
@@ -295,8 +414,8 @@ export default function AgentNode({ id, data, selected }: NodeProps<AgentNodeTyp
 
     if (status.isOffline) {
       toast.warning(
-        "Offline aktuell nicht unterstuetzt",
-        "Agent-Lauf benoetigt eine aktive Verbindung.",
+        t("offlineTitle"),
+        t("offlineDescription"),
       );
       return;
     }
@@ -310,14 +429,15 @@ export default function AgentNode({ id, data, selected }: NodeProps<AgentNodeTyp
       canvasId,
       nodeId: id as Id<"nodes">,
       modelId: resolvedModelId,
+      locale: normalizedLocale,
     });
-  }, [isExecutionActive, nodeData.canvasId, id, resolvedModelId, runAgent, status.isOffline]);
+  }, [isExecutionActive, nodeData.canvasId, id, normalizedLocale, resolvedModelId, runAgent, status.isOffline, t]);
 
   const handleSubmitClarification = useCallback(async () => {
     if (status.isOffline) {
       toast.warning(
-        "Offline aktuell nicht unterstuetzt",
-        "Agent-Lauf benoetigt eine aktive Verbindung.",
+        t("offlineTitle"),
+        t("offlineDescription"),
       );
       return;
     }
@@ -331,8 +451,9 @@ export default function AgentNode({ id, data, selected }: NodeProps<AgentNodeTyp
       canvasId,
       nodeId: id as Id<"nodes">,
       clarificationAnswers,
+      locale: normalizedLocale,
     });
-  }, [clarificationAnswers, nodeData.canvasId, id, resumeAgent, status.isOffline]);
+  }, [clarificationAnswers, nodeData.canvasId, id, normalizedLocale, resumeAgent, status.isOffline, t]);
 
   if (!template) {
     return null;
@@ -363,14 +484,14 @@ export default function AgentNode({ id, data, selected }: NodeProps<AgentNodeTyp
           <div className="flex items-center gap-1.5 text-xs font-medium text-amber-700 dark:text-amber-300">
             <Bot className="h-3.5 w-3.5" />
             <span>{template.emoji}</span>
-            <span>{template.name}</span>
+            <span>{templateName}</span>
           </div>
-          <p className="line-clamp-2 text-xs text-muted-foreground">{template.description}</p>
+          <p className="line-clamp-2 text-xs text-muted-foreground">{templateDescription}</p>
         </header>
 
         <section className="space-y-1.5">
           <Label htmlFor={`agent-model-${id}`} className="text-[10px] font-semibold uppercase tracking-wide text-muted-foreground">
-            Model
+            {t("modelLabel")}
           </Label>
           <Select value={resolvedModelId} onValueChange={handleModelChange}>
             <SelectTrigger id={`agent-model-${id}`} className="nodrag nowheel w-full" size="sm">
@@ -385,10 +506,98 @@ export default function AgentNode({ id, data, selected }: NodeProps<AgentNodeTyp
             </SelectContent>
           </Select>
           <p className="text-[11px] text-muted-foreground">
-            {selectedModel?.label ?? resolvedModelId} - {creditCost} Cr
+            {t("modelCreditMeta", {
+              model: selectedModel?.label ?? resolvedModelId,
+              credits: creditCost,
+            })}
           </p>
         </section>
 
+        <section className="space-y-1.5">
+          <Label htmlFor={`agent-${id}-briefing`} className="text-[10px] font-semibold uppercase tracking-wide text-muted-foreground">
+            {t("briefingLabel")}
+          </Label>
+          <textarea
+            id={`agent-${id}-briefing`}
+            name="agent-briefing"
+            value={briefConstraints.briefing}
+            onChange={(event) =>
+              handleBriefConstraintsChange({ briefing: event.target.value })
+            }
+            placeholder={t("briefingPlaceholder")}
+            className="nodrag nowheel min-h-20 w-full resize-y rounded-md border border-border bg-background px-2 py-1.5 text-sm"
+          />
+        </section>
+
+        <section className="space-y-1.5">
+          <p className="text-[10px] font-semibold uppercase tracking-wide text-muted-foreground">
+            {t("constraintsLabel")}
+          </p>
+          <div className="space-y-1">
+            <label htmlFor={`agent-${id}-audience`} className="text-[11px] text-muted-foreground">
+              {t("audienceLabel")}
+            </label>
+            <input
+              id={`agent-${id}-audience`}
+              name="agent-audience"
+              type="text"
+              value={briefConstraints.audience}
+              onChange={(event) =>
+                handleBriefConstraintsChange({ audience: event.target.value })
+              }
+              className="nodrag nowheel w-full rounded-md border border-border bg-background px-2 py-1.5 text-sm"
+            />
+          </div>
+          <div className="space-y-1">
+            <label htmlFor={`agent-${id}-tone`} className="text-[11px] text-muted-foreground">
+              {t("toneLabel")}
+            </label>
+            <input
+              id={`agent-${id}-tone`}
+              name="agent-tone"
+              type="text"
+              value={briefConstraints.tone}
+              onChange={(event) => handleBriefConstraintsChange({ tone: event.target.value })}
+              className="nodrag nowheel w-full rounded-md border border-border bg-background px-2 py-1.5 text-sm"
+            />
+          </div>
+          <div className="space-y-1">
+            <label htmlFor={`agent-${id}-target-channels`} className="text-[11px] text-muted-foreground">
+              {t("targetChannelsLabel")}
+            </label>
+            <input
+              id={`agent-${id}-target-channels`}
+              name="agent-target-channels"
+              type="text"
+              value={briefConstraints.targetChannels.join(", ")}
+              onChange={(event) =>
+                handleBriefConstraintsChange({
+                  targetChannels: normalizeDelimitedList(event.target.value),
+                })
+              }
+              placeholder={t("targetChannelsPlaceholder")}
+              className="nodrag nowheel w-full rounded-md border border-border bg-background px-2 py-1.5 text-sm"
+            />
+          </div>
+          <div className="space-y-1">
+            <label htmlFor={`agent-${id}-hard-constraints`} className="text-[11px] text-muted-foreground">
+              {t("hardConstraintsLabel")}
+            </label>
+            <textarea
+              id={`agent-${id}-hard-constraints`}
+              name="agent-hard-constraints"
+              value={briefConstraints.hardConstraints.join("\n")}
+              onChange={(event) =>
+                handleBriefConstraintsChange({
+                  hardConstraints: normalizeDelimitedList(event.target.value, true),
+                })
+              }
+              placeholder={t("hardConstraintsPlaceholder")}
+              className="nodrag nowheel min-h-16 w-full resize-y rounded-md border border-border bg-background px-2 py-1.5 text-sm"
+            />
+          </div>
+        </section>
+
         <section className="space-y-1.5">
           <button
             type="button"
@@ -397,7 +606,7 @@ export default function AgentNode({ id, data, selected }: NodeProps<AgentNodeTyp
             aria-busy={isExecutionActive}
             className="nodrag w-full rounded-md bg-amber-600 px-3 py-2 text-sm font-medium text-white hover:bg-amber-700 disabled:cursor-not-allowed disabled:opacity-60"
           >
-            Run agent
+            {t("runAgentButton")}
           </button>
           {executionProgressLine ? (
             <p className="text-[11px] text-amber-800/90 dark:text-amber-200/90">{executionProgressLine}</p>
@@ -407,7 +616,7 @@ export default function AgentNode({ id, data, selected }: NodeProps<AgentNodeTyp
         {clarificationQuestions.length > 0 ? (
           <section className="space-y-2">
             <p className="text-[10px] font-semibold uppercase tracking-wide text-muted-foreground">
-              Clarifications
+              {t("clarificationsLabel")}
             </p>
             {clarificationQuestions.map((question) => (
               <div key={question.id} className="space-y-1">
@@ -415,7 +624,7 @@ export default function AgentNode({ id, data, selected }: NodeProps<AgentNodeTyp
                   htmlFor={`agent-${id}-clarification-${question.id}`}
                   className="text-[11px] text-foreground/90"
                 >
-                  {question.prompt}
+                  {resolveClarificationPrompt(question)}
                   {question.required ? " *" : ""}
                 </label>
                 <input
@@ -435,31 +644,36 @@ export default function AgentNode({ id, data, selected }: NodeProps<AgentNodeTyp
               onClick={() => void handleSubmitClarification()}
               className="nodrag w-full rounded-md border border-amber-500/50 bg-amber-500/10 px-3 py-2 text-sm font-medium text-amber-800 hover:bg-amber-500/20 dark:text-amber-200"
             >
-              Submit clarification
+              {t("submitClarificationButton")}
             </button>
           </section>
         ) : null}
 
-        <section className="space-y-1">
-          <p className="text-[10px] font-semibold uppercase tracking-wide text-muted-foreground">
-            Channels
-          </p>
-          <CompactList items={template.channels} />
-        </section>
-
-        <section className="space-y-1">
-          <p className="text-[10px] font-semibold uppercase tracking-wide text-muted-foreground">
-            Expected Inputs
-          </p>
-          <CompactList items={template.expectedInputs} />
-        </section>
-
-        <section className="space-y-1">
-          <p className="text-[10px] font-semibold uppercase tracking-wide text-muted-foreground">
-            Expected Outputs
-          </p>
-          <CompactList items={template.expectedOutputs} />
-        </section>
+        <details className="rounded-md border border-border/60 bg-muted/20 px-2 py-1.5">
+          <summary className="cursor-pointer text-[10px] font-semibold uppercase tracking-wide text-muted-foreground">
+            {t("templateReferenceLabel")}
+          </summary>
+          <div className="mt-2 space-y-2">
+            <section className="space-y-1">
+              <p className="text-[10px] font-semibold uppercase tracking-wide text-muted-foreground">
+                {t("templateReferenceChannelsLabel")} ({template.channels.length})
+              </p>
+              <CompactList items={template.channels} />
+            </section>
+            <section className="space-y-1">
+              <p className="text-[10px] font-semibold uppercase tracking-wide text-muted-foreground">
+                {t("templateReferenceInputsLabel")} ({template.expectedInputs.length})
+              </p>
+              <CompactList items={template.expectedInputs} />
+            </section>
+            <section className="space-y-1">
+              <p className="text-[10px] font-semibold uppercase tracking-wide text-muted-foreground">
+                {t("templateReferenceOutputsLabel")} ({template.expectedOutputs.length})
+              </p>
+              <CompactList items={template.expectedOutputs} />
+            </section>
+          </div>
+        </details>
       </div>
     </BaseNodeWrapper>
   );
diff --git a/components/canvas/nodes/agent-output-node.tsx b/components/canvas/nodes/agent-output-node.tsx
index ec4fb16..4f030e4 100644
--- a/components/canvas/nodes/agent-output-node.tsx
+++ b/components/canvas/nodes/agent-output-node.tsx
@@ -1,6 +1,7 @@
 "use client";
 
 import { Handle, Position, type Node, type NodeProps } from "@xyflow/react";
+import { useTranslations } from "next-intl";
 
 import BaseNodeWrapper from "./base-node-wrapper";
 
@@ -19,7 +20,28 @@ type AgentOutputNodeData = {
 
 type AgentOutputNodeType = Node<AgentOutputNodeData, "agent-output">;
 
+function tryFormatJsonBody(body: string): string | null {
+  const trimmed = body.trim();
+  if (!trimmed) {
+    return null;
+  }
+
+  const looksLikeJsonObject = trimmed.startsWith("{") && trimmed.endsWith("}");
+  const looksLikeJsonArray = trimmed.startsWith("[") && trimmed.endsWith("]");
+  if (!looksLikeJsonObject && !looksLikeJsonArray) {
+    return null;
+  }
+
+  try {
+    const parsed = JSON.parse(trimmed) as unknown;
+    return JSON.stringify(parsed, null, 2);
+  } catch {
+    return null;
+  }
+}
+
 export default function AgentOutputNode({ data, selected }: NodeProps<AgentOutputNodeType>) {
+  const t = useTranslations("agentOutputNode");
   const nodeData = data as AgentOutputNodeData;
   const isSkeleton = nodeData.isSkeleton === true;
   const hasStepCounter =
@@ -39,7 +61,11 @@ export default function AgentOutputNode({ data, selected }: NodeProps<AgentOutpu
   const stepCounter = hasStepCounter
     ? `${safeStepIndex + 1}/${safeStepTotal}`
     : null;
-  const resolvedTitle = nodeData.title ?? (isSkeleton ? "Planned output" : "Agent output");
+  const resolvedTitle =
+    nodeData.title ??
+    (isSkeleton ? t("plannedOutputDefaultTitle") : t("defaultTitle"));
+  const body = nodeData.body ?? "";
+  const formattedJsonBody = isSkeleton ? null : tryFormatJsonBody(body);
 
   return (
     <BaseNodeWrapper
@@ -63,52 +89,63 @@ export default function AgentOutputNode({ data, selected }: NodeProps<AgentOutpu
               {resolvedTitle}
             </p>
             {isSkeleton ? (
-              <span className="shrink-0 rounded-full border border-amber-500/50 bg-amber-500/10 px-2 py-0.5 text-[10px] font-semibold uppercase tracking-wide text-amber-800 dark:text-amber-200">
-                Skeleton
-              </span>
+                <span className="shrink-0 rounded-full border border-amber-500/50 bg-amber-500/10 px-2 py-0.5 text-[10px] font-semibold uppercase tracking-wide text-amber-800 dark:text-amber-200">
+                  {t("skeletonBadge")}
+                </span>
+              ) : null}
+            </div>
+            {isSkeleton ? (
+              <p className="text-[11px] text-amber-700/90 dark:text-amber-300/90">
+                {t("plannedOutputLabel")}
+                {stepCounter ? ` - ${stepCounter}` : ""}
+                {nodeData.stepId ? ` - ${nodeData.stepId}` : ""}
+              </p>
             ) : null}
-          </div>
-          {isSkeleton ? (
-            <p className="text-[11px] text-amber-700/90 dark:text-amber-300/90">
-              Planned output{stepCounter ? ` - ${stepCounter}` : ""}
-              {nodeData.stepId ? ` - ${nodeData.stepId}` : ""}
-            </p>
-          ) : null}
         </header>
 
-        <section className="space-y-1">
-          <p className="text-[10px] font-semibold uppercase tracking-wide text-muted-foreground">
-            Channel
-          </p>
-          <p className="truncate text-xs text-foreground/90" title={nodeData.channel}>
-            {nodeData.channel ?? "-"}
-          </p>
+        <section
+          data-testid="agent-output-meta-strip"
+          className="grid grid-cols-2 gap-2 rounded-md border border-border/70 bg-muted/30 px-2 py-1.5"
+        >
+          <div className="min-w-0">
+            <p className="text-[10px] font-semibold uppercase tracking-wide text-muted-foreground">{t("channelLabel")}</p>
+            <p className="truncate text-xs font-medium text-foreground/90" title={nodeData.channel}>
+              {nodeData.channel ?? "-"}
+            </p>
+          </div>
+          <div className="min-w-0">
+            <p className="text-[10px] font-semibold uppercase tracking-wide text-muted-foreground">{t("typeLabel")}</p>
+            <p className="truncate text-xs font-medium text-foreground/90" title={nodeData.outputType}>
+              {nodeData.outputType ?? "-"}
+            </p>
+          </div>
         </section>
 
         <section className="space-y-1">
           <p className="text-[10px] font-semibold uppercase tracking-wide text-muted-foreground">
-            Output Type
-          </p>
-          <p className="truncate text-xs text-foreground/90" title={nodeData.outputType}>
-            {nodeData.outputType ?? "-"}
-          </p>
-        </section>
-
-        <section className="space-y-1">
-          <p className="text-[10px] font-semibold uppercase tracking-wide text-muted-foreground">
-            Body
+            {t("bodyLabel")}
           </p>
           {isSkeleton ? (
             <div
               data-testid="agent-output-skeleton-body"
               className="animate-pulse rounded-md border border-dashed border-amber-500/40 bg-gradient-to-r from-amber-500/10 via-amber-500/20 to-amber-500/10 p-3"
             >
-              <p className="text-[11px] text-amber-800/90 dark:text-amber-200/90">Planned content</p>
+              <p className="text-[11px] text-amber-800/90 dark:text-amber-200/90">{t("plannedContent")}</p>
             </div>
+          ) : formattedJsonBody ? (
+            <pre
+              data-testid="agent-output-json-body"
+              className="max-h-48 overflow-auto rounded-md border border-border/80 bg-muted/40 p-3 font-mono text-[11px] leading-relaxed text-foreground/95"
+            >
+              <code>{formattedJsonBody}</code>
+            </pre>
           ) : (
-            <p className="line-clamp-6 whitespace-pre-wrap text-xs text-foreground/90">
-              {nodeData.body ?? ""}
-            </p>
+            <div
+              data-testid="agent-output-text-body"
+              className="max-h-48 overflow-auto rounded-md border border-border/70 bg-background/70 p-3 text-[13px] leading-relaxed text-foreground/90"
+            >
+              <p className="whitespace-pre-wrap break-words">{body}</p>
+            </div>
           )}
         </section>
       </div>
diff --git a/convex/agents.ts b/convex/agents.ts
index 980e962..25470c9 100644
--- a/convex/agents.ts
+++ b/convex/agents.ts
@@ -14,8 +14,12 @@ import { getNodeDataRecord } from "./ai_node_data";
 import { formatTerminalStatusMessage } from "./ai_errors";
 import {
   areClarificationAnswersComplete,
+  buildPreflightClarificationQuestions,
+  normalizeAgentBriefConstraints,
   normalizeAgentExecutionPlan,
+  normalizeAgentLocale,
   normalizeAgentOutputDraft,
+  type AgentLocale,
   type AgentClarificationAnswerMap,
   type AgentClarificationQuestion,
   type AgentExecutionStep,
@@ -109,6 +113,14 @@ function buildExecuteSchema(stepIds: string[]): Record<string, unknown> {
   };
 }
 
+function getOutputLanguageInstruction(locale: AgentLocale): string {
+  if (locale === "de") {
+    return "Write all generated fields in German (de-DE), including step titles, channel labels, output types, clarification prompts, and body content.";
+  }
+
+  return "Write all generated fields in English (en-US), including step titles, channel labels, output types, clarification prompts, and body content.";
+}
+
 type InternalApiShape = {
   canvasGraph: {
     getInternal: FunctionReference<
@@ -130,6 +142,7 @@ type InternalApiShape = {
         canvasId: Id<"canvases">;
         nodeId: Id<"nodes">;
         modelId: string;
+        locale: AgentLocale;
         userId: string;
         reservationId?: Id<"creditTransactions">;
         shouldDecrementConcurrency: boolean;
@@ -143,6 +156,7 @@ type InternalApiShape = {
         canvasId: Id<"canvases">;
         nodeId: Id<"nodes">;
         modelId: string;
+        locale: AgentLocale;
         userId: string;
         reservationId?: Id<"creditTransactions">;
         shouldDecrementConcurrency: boolean;
@@ -401,6 +415,13 @@ function collectIncomingContext(
   return lines.length > 0 ? lines.join("\n") : "No incoming nodes connected to this agent.";
 }
 
+function countIncomingContext(
+  graph: { edges: Doc<"edges">[] },
+  agentNodeId: Id<"nodes">,
+): number {
+  return graph.edges.filter((edge) => edge.targetNodeId === agentNodeId).length;
+}
+
 function getAgentNodeFromGraph(
   graph: { nodes: Doc<"nodes">[] },
   nodeId: Id<"nodes">,
@@ -831,6 +852,7 @@ export const analyzeAgent = internalAction({
     canvasId: v.id("canvases"),
     nodeId: v.id("nodes"),
     modelId: v.string(),
+    locale: v.union(v.literal("de"), v.literal("en")),
     userId: v.string(),
     reservationId: v.optional(v.id("creditTransactions")),
     shouldDecrementConcurrency: v.boolean(),
@@ -850,7 +872,27 @@ export const analyzeAgent = internalAction({
       const agentData = getNodeDataRecord(agentNode.data);
       const template = getAgentTemplate(trimText(agentData.templateId) || "campaign-distributor");
       const existingAnswers = normalizeAnswerMap(agentData.clarificationAnswers);
+      const locale = normalizeAgentLocale(args.locale);
+      const briefConstraints = normalizeAgentBriefConstraints(agentData.briefConstraints);
       const incomingContext = collectIncomingContext(graph, args.nodeId);
+      const incomingContextCount = countIncomingContext(graph, args.nodeId);
+
+      const preflightClarificationQuestions = buildPreflightClarificationQuestions({
+        briefConstraints,
+        incomingContextCount,
+      });
+      const hasPreflightRequiredGaps = !areClarificationAnswersComplete(
+        preflightClarificationQuestions,
+        existingAnswers,
+      );
+
+      if (preflightClarificationQuestions.length > 0 && hasPreflightRequiredGaps) {
+        await ctx.runMutation(internalApi.agents.setAgentClarifying, {
+          nodeId: args.nodeId,
+          clarificationQuestions: preflightClarificationQuestions,
+        });
+        return;
+      }
 
       const analysis = await generateStructuredObjectViaOpenRouter<{
         analysisSummary: string;
@@ -864,20 +906,25 @@ export const analyzeAgent = internalAction({
           {
             role: "system",
             content:
-              "You are the LemonSpace Agent Analyzer. Inspect incoming canvas context and decide if clarification is required before execution. Ask only necessary short questions.",
+              [
+                "You are the LemonSpace Agent Analyzer. Inspect incoming canvas context and decide if clarification is required before execution. Ask only necessary short questions.",
+                getOutputLanguageInstruction(locale),
+              ].join(" "),
           },
           {
             role: "user",
             content: [
-              `Template: ${template?.name ?? "Unknown template"}`,
-              `Template description: ${template?.description ?? ""}`,
-              "Incoming node context:",
-              incomingContext,
-              `Current clarification answers: ${JSON.stringify(existingAnswers)}`,
-              "Return structured JSON matching the schema.",
-            ].join("\n\n"),
-          },
-        ],
+                `Template: ${template?.name ?? "Unknown template"}`,
+                `Template description: ${template?.description ?? ""}`,
+                `Brief + constraints: ${JSON.stringify(briefConstraints)}`,
+                "Incoming node context:",
+                incomingContext,
+                `Incoming context node count: ${incomingContextCount}`,
+                `Current clarification answers: ${JSON.stringify(existingAnswers)}`,
+                "Return structured JSON matching the schema.",
+              ].join("\n\n"),
+            },
+          ],
       });
 
       const clarificationQuestions = normalizeClarificationQuestions(
@@ -914,6 +961,7 @@ export const analyzeAgent = internalAction({
         canvasId: args.canvasId,
         nodeId: args.nodeId,
         modelId: args.modelId,
+        locale,
         userId: args.userId,
         reservationId: args.reservationId,
         shouldDecrementConcurrency: args.shouldDecrementConcurrency,
@@ -934,6 +982,7 @@ export const executeAgent = internalAction({
     canvasId: v.id("canvases"),
     nodeId: v.id("nodes"),
     modelId: v.string(),
+    locale: v.union(v.literal("de"), v.literal("en")),
     userId: v.string(),
     reservationId: v.optional(v.id("creditTransactions")),
     shouldDecrementConcurrency: v.boolean(),
@@ -954,6 +1003,8 @@ export const executeAgent = internalAction({
       const agentData = getNodeDataRecord(agentNode.data);
       const template = getAgentTemplate(trimText(agentData.templateId) || "campaign-distributor");
       const clarificationAnswers = normalizeAnswerMap(agentData.clarificationAnswers);
+      const locale = normalizeAgentLocale(args.locale);
+      const briefConstraints = normalizeAgentBriefConstraints(agentData.briefConstraints);
       const incomingContext = collectIncomingContext(graph, args.nodeId);
       const executionPlanSummary = trimText(agentData.executionPlanSummary);
       const executionSteps = normalizeExecutionSteps(agentData.executionSteps);
@@ -975,13 +1026,17 @@ export const executeAgent = internalAction({
           {
             role: "system",
             content:
-              "You are the LemonSpace Agent Executor. Produce concrete channel outputs from context and clarification answers. Return one output per step, keyed by stepId.",
+              [
+                "You are the LemonSpace Agent Executor. Produce concrete channel outputs from context and clarification answers. Return one output per step, keyed by stepId.",
+                getOutputLanguageInstruction(locale),
+              ].join(" "),
           },
           {
             role: "user",
             content: [
               `Template: ${template?.name ?? "Unknown template"}`,
               `Template description: ${template?.description ?? ""}`,
+              `Brief + constraints: ${JSON.stringify(briefConstraints)}`,
               `Analyze summary: ${executionPlanSummary}`,
               `Clarification answers: ${JSON.stringify(clarificationAnswers)}`,
               `Execution steps: ${JSON.stringify(
@@ -1066,6 +1121,7 @@ export const runAgent = action({
     canvasId: v.id("canvases"),
     nodeId: v.id("nodes"),
     modelId: v.string(),
+    locale: v.union(v.literal("de"), v.literal("en")),
   },
   handler: async (ctx, args): Promise<{ queued: true; nodeId: Id<"nodes"> }> => {
     const canvas = await ctx.runQuery(api.canvases.get, {
@@ -1126,6 +1182,7 @@ export const runAgent = action({
         canvasId: args.canvasId,
         nodeId: args.nodeId,
         modelId: selectedModel.id,
+        locale: normalizeAgentLocale(args.locale),
         userId: canvas.ownerId,
         reservationId: reservationId ?? undefined,
         shouldDecrementConcurrency: usageIncremented,
@@ -1155,6 +1212,7 @@ export const resumeAgent = action({
     canvasId: v.id("canvases"),
     nodeId: v.id("nodes"),
     clarificationAnswers: v.record(v.string(), v.string()),
+    locale: v.union(v.literal("de"), v.literal("en")),
   },
   handler: async (ctx, args): Promise<{ queued: true; nodeId: Id<"nodes"> }> => {
     const canvas = await ctx.runQuery(api.canvases.get, {
@@ -1211,6 +1269,7 @@ export const resumeAgent = action({
         canvasId: args.canvasId,
         nodeId: args.nodeId,
         modelId,
+        locale: normalizeAgentLocale(args.locale),
         userId: canvas.ownerId,
         reservationId,
         shouldDecrementConcurrency,
diff --git a/lib/agent-run-contract.ts b/lib/agent-run-contract.ts
index 220bc96..488f651 100644
--- a/lib/agent-run-contract.ts
+++ b/lib/agent-run-contract.ts
@@ -25,6 +25,16 @@ export type AgentExecutionPlan = {
   steps: AgentExecutionStep[];
 };
 
+export type AgentBriefConstraints = {
+  briefing: string;
+  audience: string;
+  tone: string;
+  targetChannels: string[];
+  hardConstraints: string[];
+};
+
+export type AgentLocale = "de" | "en";
+
 export type AgentAnalyzeResult = {
   clarificationQuestions: AgentClarificationQuestion[];
   executionPlan: AgentExecutionPlan | null;
@@ -46,6 +56,102 @@ function normalizeStepId(value: unknown): string {
     .replace(/\s+/g, "-");
 }
 
+function normalizeStringArray(raw: unknown, options?: { lowerCase?: boolean }): string[] {
+  if (!Array.isArray(raw)) {
+    return [];
+  }
+
+  const seen = new Set<string>();
+  const normalized: string[] = [];
+
+  for (const item of raw) {
+    const trimmed = trimString(item);
+    if (trimmed === "") {
+      continue;
+    }
+
+    const value = options?.lowerCase ? trimmed.toLowerCase() : trimmed;
+    if (seen.has(value)) {
+      continue;
+    }
+
+    seen.add(value);
+    normalized.push(value);
+  }
+
+  return normalized;
+}
+
+export function normalizeAgentBriefConstraints(raw: unknown): AgentBriefConstraints {
+  const rawRecord =
+    raw && typeof raw === "object" && !Array.isArray(raw)
+      ? (raw as Record<string, unknown>)
+      : null;
+
+  return {
+    briefing: trimString(rawRecord?.briefing),
+    audience: trimString(rawRecord?.audience),
+    tone: trimString(rawRecord?.tone),
+    targetChannels: normalizeStringArray(rawRecord?.targetChannels, { lowerCase: true }),
+    hardConstraints: normalizeStringArray(rawRecord?.hardConstraints),
+  };
+}
+
+export function normalizeAgentLocale(raw: unknown): AgentLocale {
+  if (raw === "de" || raw === "en") {
+    return raw;
+  }
+  return "de";
+}
+
+export type PreflightClarificationInput = {
+  briefConstraints: AgentBriefConstraints | unknown;
+  incomingContextCount: number;
+};
+
+const BRIEFING_REQUIRED_QUESTION: AgentClarificationQuestion = {
+  id: "briefing",
+  prompt: "What should the agent produce? Provide the brief in one or two sentences.",
+  required: true,
+};
+
+const TARGET_CHANNELS_REQUIRED_QUESTION: AgentClarificationQuestion = {
+  id: "target-channels",
+  prompt: "Which channels should this run target? List at least one channel.",
+  required: true,
+};
+
+const INCOMING_CONTEXT_REQUIRED_QUESTION: AgentClarificationQuestion = {
+  id: "incoming-context",
+  prompt: "No context was provided. What source context should the agent use?",
+  required: true,
+};
+
+export function buildPreflightClarificationQuestions(
+  input: PreflightClarificationInput,
+): AgentClarificationQuestion[] {
+  const normalizedBriefConstraints = normalizeAgentBriefConstraints(input.briefConstraints);
+  const incomingContextCount = Number.isFinite(input.incomingContextCount)
+    ? Math.max(0, Math.trunc(input.incomingContextCount))
+    : 0;
+
+  const questions: AgentClarificationQuestion[] = [];
+
+  if (normalizedBriefConstraints.briefing === "") {
+    questions.push(BRIEFING_REQUIRED_QUESTION);
+  }
+
+  if (normalizedBriefConstraints.targetChannels.length === 0) {
+    questions.push(TARGET_CHANNELS_REQUIRED_QUESTION);
+  }
+
+  if (incomingContextCount === 0) {
+    questions.push(INCOMING_CONTEXT_REQUIRED_QUESTION);
+  }
+
+  return questions;
+}
+
 export function normalizeAgentExecutionPlan(raw: unknown): AgentExecutionPlan {
   const rawRecord =
     raw && typeof raw === "object" && !Array.isArray(raw)
diff --git a/messages/de.json b/messages/de.json
index 0723e02..a25b53a 100644
--- a/messages/de.json
+++ b/messages/de.json
@@ -176,6 +176,52 @@
     "creditMeta": "{credits} Credits",
     "errorFallback": "Video-Generierung fehlgeschlagen"
   },
+  "agentNode": {
+    "templates": {
+      "campaignDistributor": {
+        "name": "Campaign Distributor",
+        "description": "Entwickelt und verteilt LemonSpace-Kampagneninhalte kanal- und plattformgerecht."
+      }
+    },
+    "modelLabel": "Modell",
+    "modelCreditMeta": "{model} - {credits} Cr",
+    "briefingLabel": "Briefing",
+    "briefingPlaceholder": "Beschreibe Aufgabe und gewuenschtes Ergebnis kurz und konkret.",
+    "constraintsLabel": "Vorgaben",
+    "audienceLabel": "Zielgruppe",
+    "toneLabel": "Tonfall",
+    "targetChannelsLabel": "Zielkanaele",
+    "targetChannelsPlaceholder": "LinkedIn, Instagram Feed",
+    "hardConstraintsLabel": "Harte Constraints",
+    "hardConstraintsPlaceholder": "Keine Emojis\nMaximal 120 Woerter",
+    "runAgentButton": "Agent starten",
+    "clarificationsLabel": "Rueckfragen",
+    "submitClarificationButton": "Rueckfragen bestaetigen",
+    "templateReferenceLabel": "Template-Referenz",
+    "templateReferenceChannelsLabel": "Kanaele",
+    "templateReferenceInputsLabel": "Inputs",
+    "templateReferenceOutputsLabel": "Outputs",
+    "executingStepFallback": "Schritt {current}/{total} wird ausgefuehrt",
+    "executingPlannedTotalFallback": "Geplante Outputs werden erstellt ({total} gesamt)",
+    "executingPlannedFallback": "Geplante Outputs werden erstellt",
+    "offlineTitle": "Offline derzeit nicht verfuegbar",
+    "offlineDescription": "Ein Agent-Lauf benoetigt eine aktive Verbindung.",
+    "clarificationPrompts": {
+      "briefing": "Was soll der Agent liefern? Bitte formuliere das Briefing in ein bis zwei Saetzen.",
+      "targetChannels": "Welche Kanaele soll dieser Lauf bedienen? Bitte nenne mindestens einen Kanal.",
+      "incomingContext": "Es wurde kein Kontext verbunden. Welche Quelle soll der Agent verwenden?"
+    }
+  },
+  "agentOutputNode": {
+    "defaultTitle": "Agent-Output",
+    "plannedOutputDefaultTitle": "Geplanter Output",
+    "skeletonBadge": "SKELETON",
+    "plannedOutputLabel": "Geplanter Output",
+    "channelLabel": "Kanal",
+    "typeLabel": "Typ",
+    "bodyLabel": "Inhalt",
+    "plannedContent": "Geplanter Inhalt"
+  },
   "credits": {
     "balance": "Guthaben",
     "available": "Verfügbar",
diff --git a/messages/en.json b/messages/en.json
index 3709ab1..baaf992 100644
--- a/messages/en.json
+++ b/messages/en.json
@@ -176,6 +176,52 @@
     "creditMeta": "{credits} credits",
     "errorFallback": "Video generation failed"
   },
+  "agentNode": {
+    "templates": {
+      "campaignDistributor": {
+        "name": "Campaign Distributor",
+        "description": "Develops and distributes LemonSpace campaign content across social media and messenger channels."
+      }
+    },
+    "modelLabel": "Model",
+    "modelCreditMeta": "{model} - {credits} Cr",
+    "briefingLabel": "Briefing",
+    "briefingPlaceholder": "Describe the core task and desired output.",
+    "constraintsLabel": "Constraints",
+    "audienceLabel": "Audience",
+    "toneLabel": "Tone",
+    "targetChannelsLabel": "Target channels",
+    "targetChannelsPlaceholder": "LinkedIn, Instagram Feed",
+    "hardConstraintsLabel": "Hard constraints",
+    "hardConstraintsPlaceholder": "No emojis\nMax 120 words",
+    "runAgentButton": "Run agent",
+    "clarificationsLabel": "Clarifications",
+    "submitClarificationButton": "Submit clarification",
+    "templateReferenceLabel": "Template reference",
+    "templateReferenceChannelsLabel": "Channels",
+    "templateReferenceInputsLabel": "Inputs",
+    "templateReferenceOutputsLabel": "Outputs",
+    "executingStepFallback": "Executing step {current}/{total}",
+    "executingPlannedTotalFallback": "Executing planned outputs ({total} total)",
+    "executingPlannedFallback": "Executing planned outputs",
+    "offlineTitle": "Offline currently not supported",
+    "offlineDescription": "Agent run requires an active connection.",
+    "clarificationPrompts": {
+      "briefing": "What should the agent produce? Provide the brief in one or two sentences.",
+      "targetChannels": "Which channels should this run target? List at least one channel.",
+      "incomingContext": "No context was provided. What source context should the agent use?"
+    }
+  },
+  "agentOutputNode": {
+    "defaultTitle": "Agent output",
+    "plannedOutputDefaultTitle": "Planned output",
+    "skeletonBadge": "Skeleton",
+    "plannedOutputLabel": "Planned output",
+    "channelLabel": "Channel",
+    "typeLabel": "Type",
+    "bodyLabel": "Body",
+    "plannedContent": "Planned content"
+  },
   "credits": {
     "balance": "Balance",
     "available": "Available",
diff --git a/tests/agent-node-runtime.test.ts b/tests/agent-node-runtime.test.ts
index bf5bf6b..0fa517e 100644
--- a/tests/agent-node-runtime.test.ts
+++ b/tests/agent-node-runtime.test.ts
@@ -89,6 +89,56 @@ vi.mock("@/components/canvas/nodes/base-node-wrapper", () => ({
   default: ({ children }: { children: React.ReactNode }) => React.createElement("div", null, children),
 }));
 
+const translations: Record<string, string> = {
+  "agentNode.templates.campaignDistributor.name": "Campaign Distributor",
+  "agentNode.templates.campaignDistributor.description":
+    "Develops and distributes LemonSpace campaign content across social media and messenger channels.",
+  "agentNode.modelLabel": "Model",
+  "agentNode.modelCreditMeta": "{model} - {credits} Cr",
+  "agentNode.briefingLabel": "Briefing",
+  "agentNode.briefingPlaceholder": "Describe the core task and desired output.",
+  "agentNode.constraintsLabel": "Constraints",
+  "agentNode.audienceLabel": "Audience",
+  "agentNode.toneLabel": "Tone",
+  "agentNode.targetChannelsLabel": "Target channels",
+  "agentNode.targetChannelsPlaceholder": "LinkedIn, Instagram Feed",
+  "agentNode.hardConstraintsLabel": "Hard constraints",
+  "agentNode.hardConstraintsPlaceholder": "No emojis\nMax 120 words",
+  "agentNode.runAgentButton": "Run agent",
+  "agentNode.clarificationsLabel": "Clarifications",
+  "agentNode.submitClarificationButton": "Submit clarification",
+  "agentNode.templateReferenceLabel": "Template reference",
+  "agentNode.templateReferenceChannelsLabel": "Channels",
+  "agentNode.templateReferenceInputsLabel": "Inputs",
+  "agentNode.templateReferenceOutputsLabel": "Outputs",
+  "agentNode.executingStepFallback": "Executing step {current}/{total}",
+  "agentNode.executingPlannedTotalFallback": "Executing planned outputs ({total} total)",
+  "agentNode.executingPlannedFallback": "Executing planned outputs",
+  "agentNode.offlineTitle": "Offline currently not supported",
+  "agentNode.offlineDescription": "Agent run requires an active connection.",
+  "agentNode.clarificationPrompts.briefing":
+    "What should the agent produce? Provide the brief in one or two sentences.",
+  "agentNode.clarificationPrompts.targetChannels":
+    "Which channels should this run target? List at least one channel.",
+  "agentNode.clarificationPrompts.incomingContext":
+    "No context was provided. What source context should the agent use?",
+};
+
+vi.mock("next-intl", () => ({
+  useLocale: () => "de",
+  useTranslations: (namespace?: string) =>
+    (key: string, values?: Record<string, unknown>) => {
+      const fullKey = namespace ? `${namespace}.${key}` : key;
+      let text = translations[fullKey] ?? key;
+      if (values) {
+        for (const [name, value] of Object.entries(values)) {
+          text = text.replaceAll(`{${name}}`, String(value));
+        }
+      }
+      return text;
+    },
+}));
+
 vi.mock("@xyflow/react", () => ({
   Handle: () => null,
   Position: { Left: "left", Right: "right" },
@@ -143,8 +193,15 @@ describe("AgentNode runtime", () => {
             canvasId: "canvas-1",
             templateId: "campaign-distributor",
             modelId: "openai/gpt-5.4-mini",
+            briefConstraints: {
+              briefing: "Draft channel-ready campaign copy",
+              audience: "SaaS founders",
+              tone: "Confident and practical",
+              targetChannels: ["LinkedIn", "Instagram Feed"],
+              hardConstraints: ["No emojis", "Max 120 words"],
+            },
             clarificationQuestions: [
-              { id: "audience", prompt: "Target audience?", required: true },
+              { id: "briefing", prompt: "RAW_BRIEFING_PROMPT", required: true },
             ],
             clarificationAnswers: {},
           } as Record<string, unknown>,
@@ -167,9 +224,27 @@ describe("AgentNode runtime", () => {
 
     expect(container.textContent).toContain("GPT-5.4 Mini");
     expect(container.textContent).toContain("15 Cr");
-    expect(container.textContent).toContain("Channels");
-    expect(container.textContent).toContain("Expected Inputs");
-    expect(container.textContent).toContain("Expected Outputs");
+    expect(container.textContent).toContain("Briefing");
+    expect(container.textContent).toContain("Constraints");
+    expect(container.textContent).toContain("Template reference");
+
+    const briefingTextarea = container.querySelector('textarea[name="agent-briefing"]');
+    if (!(briefingTextarea instanceof HTMLTextAreaElement)) {
+      throw new Error("Briefing textarea not found");
+    }
+    expect(briefingTextarea.value).toBe("Draft channel-ready campaign copy");
+
+    const targetChannelsInput = container.querySelector('input[name="agent-target-channels"]');
+    if (!(targetChannelsInput instanceof HTMLInputElement)) {
+      throw new Error("Target channels input not found");
+    }
+    expect(targetChannelsInput.value).toBe("LinkedIn, Instagram Feed");
+
+    const hardConstraintsInput = container.querySelector('textarea[name="agent-hard-constraints"]');
+    if (!(hardConstraintsInput instanceof HTMLTextAreaElement)) {
+      throw new Error("Hard constraints textarea not found");
+    }
+    expect(hardConstraintsInput.value).toBe("No emojis\nMax 120 words");
 
     await act(async () => {
       modelSelect.value = "openai/gpt-5.4";
@@ -183,7 +258,71 @@ describe("AgentNode runtime", () => {
       }),
     );
 
-    const clarificationInput = container.querySelector('input[name="clarification-audience"]');
+    await act(async () => {
+      const valueSetter = Object.getOwnPropertyDescriptor(
+        HTMLTextAreaElement.prototype,
+        "value",
+      )?.set;
+      valueSetter?.call(briefingTextarea, "Adapt this launch to each channel");
+      briefingTextarea.dispatchEvent(new Event("input", { bubbles: true }));
+    });
+
+    expect(mocks.queueNodeDataUpdate).toHaveBeenCalledWith(
+      expect.objectContaining({
+        nodeId: "agent-1",
+        data: expect.objectContaining({
+          briefConstraints: expect.objectContaining({
+            briefing: "Adapt this launch to each channel",
+          }),
+        }),
+      }),
+    );
+
+    await act(async () => {
+      const valueSetter = Object.getOwnPropertyDescriptor(
+        HTMLInputElement.prototype,
+        "value",
+      )?.set;
+      valueSetter?.call(targetChannelsInput, "LinkedIn, X,  TikTok");
+      targetChannelsInput.dispatchEvent(new Event("input", { bubbles: true }));
+    });
+
+    expect(mocks.queueNodeDataUpdate).toHaveBeenCalledWith(
+      expect.objectContaining({
+        nodeId: "agent-1",
+        data: expect.objectContaining({
+          briefConstraints: expect.objectContaining({
+            targetChannels: ["LinkedIn", "X", "TikTok"],
+          }),
+        }),
+      }),
+    );
+
+    await act(async () => {
+      const valueSetter = Object.getOwnPropertyDescriptor(
+        HTMLTextAreaElement.prototype,
+        "value",
+      )?.set;
+      valueSetter?.call(hardConstraintsInput, "No emojis\nMax 80 words, include CTA");
+      hardConstraintsInput.dispatchEvent(new Event("input", { bubbles: true }));
+    });
+
+    expect(mocks.queueNodeDataUpdate).toHaveBeenCalledWith(
+      expect.objectContaining({
+        nodeId: "agent-1",
+        data: expect.objectContaining({
+          briefConstraints: expect.objectContaining({
+            hardConstraints: ["No emojis", "Max 80 words", "include CTA"],
+          }),
+        }),
+      }),
+    );
+
+    expect(container.textContent).toContain(
+      "What should the agent produce? Provide the brief in one or two sentences.",
+    );
+
+    const clarificationInput = container.querySelector('input[name="clarification-briefing"]');
     if (!(clarificationInput instanceof HTMLInputElement)) {
       throw new Error("Clarification input not found");
     }
@@ -201,7 +340,7 @@ describe("AgentNode runtime", () => {
       expect.objectContaining({
         nodeId: "agent-1",
         data: expect.objectContaining({
-          clarificationAnswers: expect.objectContaining({ audience: "SaaS founders" }),
+          clarificationAnswers: expect.objectContaining({ briefing: "SaaS founders" }),
         }),
       }),
     );
@@ -221,6 +360,7 @@ describe("AgentNode runtime", () => {
       canvasId: "canvas-1",
       nodeId: "agent-1",
       modelId: "openai/gpt-5.4",
+      locale: "de",
     });
 
     const submitButton = Array.from(container.querySelectorAll("button")).find((element) =>
@@ -237,7 +377,8 @@ describe("AgentNode runtime", () => {
     expect(mocks.resumeAgent).toHaveBeenCalledWith({
       canvasId: "canvas-1",
       nodeId: "agent-1",
-      clarificationAnswers: { audience: "SaaS founders" },
+      clarificationAnswers: { briefing: "SaaS founders" },
+      locale: "de",
     });
   });
 
diff --git a/tests/agent-node.test.ts b/tests/agent-node.test.ts
index d6a64d4..985711a 100644
--- a/tests/agent-node.test.ts
+++ b/tests/agent-node.test.ts
@@ -22,6 +22,45 @@ vi.mock("@xyflow/react", () => ({
   Position: { Left: "left", Right: "right" },
 }));
 
+const translations: Record<string, string> = {
+  "agentNode.templates.campaignDistributor.name": "Campaign Distributor",
+  "agentNode.templates.campaignDistributor.description":
+    "Develops and distributes LemonSpace campaign content across social media and messenger channels.",
+  "agentNode.modelLabel": "Model",
+  "agentNode.modelCreditMeta": "{model} - {credits} Cr",
+  "agentNode.briefingLabel": "Briefing",
+  "agentNode.briefingPlaceholder": "Describe the core task and desired output.",
+  "agentNode.constraintsLabel": "Constraints",
+  "agentNode.audienceLabel": "Audience",
+  "agentNode.toneLabel": "Tone",
+  "agentNode.targetChannelsLabel": "Target channels",
+  "agentNode.targetChannelsPlaceholder": "LinkedIn, Instagram Feed",
+  "agentNode.hardConstraintsLabel": "Hard constraints",
+  "agentNode.hardConstraintsPlaceholder": "No emojis\nMax 120 words",
+  "agentNode.runAgentButton": "Run agent",
+  "agentNode.clarificationsLabel": "Clarifications",
+  "agentNode.submitClarificationButton": "Submit clarification",
+  "agentNode.templateReferenceLabel": "Template reference",
+  "agentNode.templateReferenceChannelsLabel": "Channels",
+  "agentNode.templateReferenceInputsLabel": "Inputs",
+  "agentNode.templateReferenceOutputsLabel": "Outputs",
+};
+
+vi.mock("next-intl", () => ({
+  useLocale: () => "de",
+  useTranslations: (namespace?: string) =>
+    (key: string, values?: Record<string, unknown>) => {
+      const fullKey = namespace ? `${namespace}.${key}` : key;
+      let text = translations[fullKey] ?? key;
+      if (values) {
+        for (const [name, value] of Object.entries(values)) {
+          text = text.replaceAll(`{${name}}`, String(value));
+        }
+      }
+      return text;
+    },
+}));
+
 import AgentNode from "@/components/canvas/nodes/agent-node";
 
 (globalThis as typeof globalThis & { IS_REACT_ACT_ENVIRONMENT?: boolean }).IS_REACT_ACT_ENVIRONMENT = true;
@@ -73,8 +112,9 @@ describe("AgentNode", () => {
     });
 
     expect(container.textContent).toContain("Campaign Distributor");
-    expect(container.textContent).toContain("Instagram Feed");
-    expect(container.textContent).toContain("Caption-Pakete");
+    expect(container.textContent).toContain("Briefing");
+    expect(container.textContent).toContain("Constraints");
+    expect(container.textContent).toContain("Template reference");
     expect(handleCalls.filter((call) => call.type === "target")).toHaveLength(1);
     expect(handleCalls.filter((call) => call.type === "source")).toHaveLength(1);
   });
diff --git a/tests/agent-output-node.test.ts b/tests/agent-output-node.test.ts
index 4276cbd..8cac669 100644
--- a/tests/agent-output-node.test.ts
+++ b/tests/agent-output-node.test.ts
@@ -22,6 +22,31 @@ vi.mock("@xyflow/react", () => ({
   Position: { Left: "left", Right: "right" },
 }));
 
+const translations: Record<string, string> = {
+  "agentOutputNode.defaultTitle": "Agent output",
+  "agentOutputNode.plannedOutputDefaultTitle": "Planned output",
+  "agentOutputNode.skeletonBadge": "Skeleton",
+  "agentOutputNode.plannedOutputLabel": "Planned output",
+  "agentOutputNode.channelLabel": "Channel",
+  "agentOutputNode.typeLabel": "Type",
+  "agentOutputNode.bodyLabel": "Body",
+  "agentOutputNode.plannedContent": "Planned content",
+};
+
+vi.mock("next-intl", () => ({
+  useTranslations: (namespace?: string) =>
+    (key: string, values?: Record<string, unknown>) => {
+      const fullKey = namespace ? `${namespace}.${key}` : key;
+      let text = translations[fullKey] ?? key;
+      if (values) {
+        for (const [name, value] of Object.entries(values)) {
+          text = text.replaceAll(`{${name}}`, String(value));
+        }
+      }
+      return text;
+    },
+}));
+
 import AgentOutputNode from "@/components/canvas/nodes/agent-output-node";
 
 (globalThis as typeof globalThis & { IS_REACT_ACT_ENVIRONMENT?: boolean }).IS_REACT_ACT_ENVIRONMENT = true;
@@ -79,6 +104,45 @@ describe("AgentOutputNode", () => {
     expect(container.textContent).toContain("instagram-feed");
     expect(container.textContent).toContain("caption");
     expect(container.textContent).toContain("A short punchy caption with hashtags");
+    expect(container.querySelector('[data-testid="agent-output-meta-strip"]')).not.toBeNull();
+    expect(container.querySelector('[data-testid="agent-output-text-body"]')).not.toBeNull();
+  });
+
+  it("renders parseable json body in a pretty-printed code block", async () => {
+    container = document.createElement("div");
+    document.body.appendChild(container);
+    root = createRoot(container);
+
+    await act(async () => {
+      root?.render(
+        React.createElement(AgentOutputNode, {
+          id: "agent-output-4",
+          selected: false,
+          dragging: false,
+          draggable: true,
+          selectable: true,
+          deletable: true,
+          zIndex: 1,
+          isConnectable: true,
+          type: "agent-output",
+          data: {
+            title: "JSON output",
+            channel: "api",
+            outputType: "payload",
+            body: '{"post":"Hello","tags":["launch","news"]}',
+            _status: "done",
+          } as Record<string, unknown>,
+          positionAbsoluteX: 0,
+          positionAbsoluteY: 0,
+        }),
+      );
+    });
+
+    const jsonBody = container.querySelector('[data-testid="agent-output-json-body"]');
+    expect(jsonBody).not.toBeNull();
+    expect(jsonBody?.textContent).toContain('"post": "Hello"');
+    expect(jsonBody?.textContent).toContain('"tags": [');
+    expect(container.querySelector('[data-testid="agent-output-text-body"]')).toBeNull();
   });
 
   it("renders input-only handle agent-output-in", async () => {
diff --git a/tests/lib/agent-run-contract.test.ts b/tests/lib/agent-run-contract.test.ts
index 4d16b1c..3608438 100644
--- a/tests/lib/agent-run-contract.test.ts
+++ b/tests/lib/agent-run-contract.test.ts
@@ -2,10 +2,14 @@ import { describe, expect, it } from "vitest";
 
 import {
   areClarificationAnswersComplete,
+  buildPreflightClarificationQuestions,
+  normalizeAgentLocale,
   normalizeAgentExecutionPlan,
+  normalizeAgentBriefConstraints,
   normalizeAgentOutputDraft,
   type AgentClarificationAnswerMap,
   type AgentClarificationQuestion,
+  type AgentBriefConstraints,
   type AgentExecutionPlan,
 } from "@/lib/agent-run-contract";
 
@@ -178,4 +182,108 @@ describe("agent run contract helpers", () => {
       expect(normalized.steps.map((step) => step.id)).toEqual(["step", "step-2", "step-3"]);
     });
   });
+
+  describe("normalizeAgentBriefConstraints", () => {
+    it("trims fields and normalizes target channels", () => {
+      const normalized = normalizeAgentBriefConstraints({
+        briefing: "  Build a launch sequence  ",
+        audience: "  SaaS founders  ",
+        tone: "  concise  ",
+        targetChannels: ["  Email  ", "", "LinkedIn", "email", "   "],
+        hardConstraints: [
+          "  Do not mention pricing  ",
+          "",
+          "Keep under 120 words",
+          "Keep under 120 words",
+        ],
+      });
+
+      expect(normalized).toEqual<AgentBriefConstraints>({
+        briefing: "Build a launch sequence",
+        audience: "SaaS founders",
+        tone: "concise",
+        targetChannels: ["email", "linkedin"],
+        hardConstraints: ["Do not mention pricing", "Keep under 120 words"],
+      });
+    });
+
+    it("falls back to safe empty values for invalid payloads", () => {
+      const normalized = normalizeAgentBriefConstraints({
+        briefing: null,
+        audience: undefined,
+        tone: 3,
+        targetChannels: ["   ", null, 1],
+        hardConstraints: "must be array",
+      });
+
+      expect(normalized).toEqual<AgentBriefConstraints>({
+        briefing: "",
+        audience: "",
+        tone: "",
+        targetChannels: [],
+        hardConstraints: [],
+      });
+    });
+  });
+
+  describe("buildPreflightClarificationQuestions", () => {
+    it("builds deterministic required questions for missing preflight requirements", () => {
+      const questions = buildPreflightClarificationQuestions({
+        briefConstraints: {
+          briefing: "",
+          audience: "Founders",
+          tone: "confident",
+          targetChannels: [],
+          hardConstraints: [],
+        },
+        incomingContextCount: 0,
+      });
+
+      expect(questions).toEqual<AgentClarificationQuestion[]>([
+        {
+          id: "briefing",
+          prompt: "What should the agent produce? Provide the brief in one or two sentences.",
+          required: true,
+        },
+        {
+          id: "target-channels",
+          prompt: "Which channels should this run target? List at least one channel.",
+          required: true,
+        },
+        {
+          id: "incoming-context",
+          prompt: "No context was provided. What source context should the agent use?",
+          required: true,
+        },
+      ]);
+    });
+
+    it("returns an empty list when all preflight requirements are satisfied", () => {
+      const questions = buildPreflightClarificationQuestions({
+        briefConstraints: {
+          briefing: "Create 3 posts",
+          audience: "Marketers",
+          tone: "friendly",
+          targetChannels: ["x"],
+          hardConstraints: ["No emojis"],
+        },
+        incomingContextCount: 2,
+      });
+
+      expect(questions).toEqual([]);
+    });
+  });
+
+  describe("normalizeAgentLocale", () => {
+    it("returns supported locale values", () => {
+      expect(normalizeAgentLocale("de")).toBe("de");
+      expect(normalizeAgentLocale("en")).toBe("en");
+    });
+
+    it("falls back to de for unsupported values", () => {
+      expect(normalizeAgentLocale("fr")).toBe("de");
+      expect(normalizeAgentLocale(undefined)).toBe("de");
+      expect(normalizeAgentLocale(null)).toBe("de");
+    });
+  });
 });