diff --git a/src/app.ts b/src/app.ts
index 9ccc21e..2ebea49 100644
--- a/src/app.ts
+++ b/src/app.ts
@@ -23,6 +23,7 @@ export async function buildApp(config: AppConfig): Promise<FastifyInstance> {
     internalAccessToken: config.NODEDC_INTERNAL_ACCESS_TOKEN,
   });
   const app = Fastify({
+    bodyLimit: 10 * 1024 * 1024,
     logger: {
       level: config.LOG_LEVEL,
     },
diff --git a/src/mcp/tool-runtime.ts b/src/mcp/tool-runtime.ts
index a3e1034..d79cb6a 100644
--- a/src/mcp/tool-runtime.ts
+++ b/src/mcp/tool-runtime.ts
@@ -73,10 +73,16 @@ const structuredBlocksJsonSchema = {
         properties: {
           id: { type: "string" },
           type: { const: "text" },
-          title: { type: "string" },
-          body: { type: "string" },
+          title: {
+            type: "string",
+            description: "Visible block title. Put headings here, not inside body markdown.",
+          },
+          body: {
+            type: "string",
+            description: "Plain block body without a leading markdown heading.",
+          },
         },
-        required: ["id", "type"],
+        required: ["id", "type", "title", "body"],
         additionalProperties: false,
       },
       {
@@ -84,7 +90,10 @@ const structuredBlocksJsonSchema = {
         properties: {
           id: { type: "string" },
           type: { const: "checker" },
-          title: { type: "string" },
+          title: {
+            type: "string",
+            description: "Visible checklist title. Put headings here, not inside item text.",
+          },
           items: {
             type: "array",
             items: {
@@ -99,7 +108,7 @@ const structuredBlocksJsonSchema = {
             },
           },
         },
-        required: ["id", "type"],
+        required: ["id", "type", "title", "items"],
         additionalProperties: false,
       },
     ],
@@ -236,10 +245,42 @@ export const mcpRuntimeTools: McpToolRuntimeDefinition[] = [
     },
     annotations: { destructiveHint: false, idempotentHint: false },
   },
+  {
+    name: "tasker_ensure_labels",
+    title: "Ensure Project Labels",
+    description: "Create missing labels in a granted project and return label ids for subsequent issue labeling.",
+    requiredScopes: ["issue:label"],
+    inputSchema: {
+      ...projectInputSchema,
+      properties: {
+        ...projectInputSchema.properties,
+        labels: {
+          type: "array",
+          minItems: 1,
+          maxItems: 50,
+          items: {
+            type: "object",
+            properties: {
+              name: { type: "string" },
+              color: {
+                type: "string",
+                description: "Optional hex color in #RRGGBB format.",
+              },
+            },
+            required: ["name"],
+            additionalProperties: false,
+          },
+        },
+        idempotency_key: { type: "string" },
+      },
+      required: ["project_id", "labels"],
+    },
+    annotations: { destructiveHint: false, idempotentHint: true },
+  },
   {
     name: "tasker_set_issue_labels",
     title: "Set Issue Labels",
-    description: "Replace issue labels with existing labels from the granted project.",
+    description: "Replace issue labels with existing or ensured labels from the granted project.",
     requiredScopes: ["issue:label"],
     inputSchema: {
       ...projectAndIssueInputSchema,
@@ -308,6 +349,20 @@ const moveIssueArgsSchema = issueArgsSchema.extend({
 const commentArgsSchema = issueArgsSchema.extend({
   body: z.string().min(1).max(20000),
 });
+const ensureLabelsArgsSchema = projectArgsSchema.extend({
+  labels: z
+    .array(
+      z.object({
+        name: z.string().min(1).max(255),
+        color: z
+          .string()
+          .regex(/^#[0-9a-fA-F]{6}$/)
+          .optional(),
+      })
+    )
+    .min(1)
+    .max(50),
+});
 const labelsArgsSchema = issueArgsSchema.extend({
   label_ids: z.array(z.string().min(1)).default([]),
 });
@@ -454,6 +509,11 @@ async function executeMcpToolOnce(
       requireToolAccess(session, "issue:comment", input.project_id, input.workspace_slug);
       return asToolResult(await deps.taskerClient.appendComment(session, input.issue_id, input));
     }
+    case "tasker_ensure_labels": {
+      const input = ensureLabelsArgsSchema.parse(args);
+      requireToolAccess(session, "issue:label", input.project_id, input.workspace_slug);
+      return asToolResult(await deps.taskerClient.ensureLabels(session, input));
+    }
     case "tasker_set_issue_labels": {
       const input = labelsArgsSchema.parse(args);
       requireToolAccess(session, "issue:label", input.project_id, input.workspace_slug);
@@ -580,6 +640,7 @@ function summarizeToolArguments(args: unknown): Record<string, unknown> {
     project_id: args.project_id,
     issue_id: args.issue_id,
     state_id: args.state_id,
+    labels_count: Array.isArray(args.labels) ? args.labels.length : undefined,
     has_structured_blocks: Array.isArray(args.structured_blocks),
   };
 }
@@ -605,12 +666,19 @@ function buildAgentInstructions(session: AgentSessionRecord): Record<string, unk
       card_structure: [
         "Keep the main issue description concise and conceptual.",
         "Use structured text blocks for current architecture, planned architecture, and implementation notes.",
-        "Use checker blocks for short verifiable phase items.",
+        "Every structured text block must use its title field for the heading; do not duplicate markdown headings like ## Status inside the body.",
+        "Wrong structured text block: title omitted and body starts with ## Текущая архитектура. Correct: title is Текущая архитектура and body contains only the section content.",
+        "Use checker blocks with explicit titles for short verifiable phase items.",
         "After implementation, add a factual implementation block with files touched and validation performed.",
       ],
+      labels: [
+        "Use tasker_ensure_labels before setting a label that is not already present in project context.",
+        "Use tasker_set_issue_labels with label ids returned by project context or tasker_ensure_labels.",
+      ],
       hard_limits: [
         "Do not delete or archive issues.",
-        "Do not create projects, labels, states, workspace invites, or workspace settings changes.",
+        "Do not create projects, states, workspace invites, or workspace settings changes.",
+        "Only create labels through tasker_ensure_labels inside granted projects.",
         "Only assign existing project members.",
         "Only use projects and workspaces present in effective grants.",
       ],
diff --git a/src/routes/agents.ts b/src/routes/agents.ts
index 6cf6f2f..67337b8 100644
--- a/src/routes/agents.ts
+++ b/src/routes/agents.ts
@@ -16,7 +16,7 @@ type AgentRouteDeps = {
   internalAccessToken?: string;
 };
 
-const MAX_AGENT_AVATAR_URL_LENGTH = 400_000;
+const MAX_AGENT_AVATAR_URL_LENGTH = 2_000_000;
 
 function isAllowedAvatarUrl(value: string): boolean {
   if (value.startsWith("data:image/")) {
@@ -678,14 +678,23 @@ function buildAgentsMd(session: AgentSessionRecord, endpoint: string): string {
     "- Never delete or archive Tasker cards, comments, labels, projects, states, members, or workspaces.",
     "- Do not call raw Tasker APIs. Use only the NODE.DC MCP tools.",
     "- Only assign existing project members returned by project context.",
+    "- If a needed label is missing, call `tasker_ensure_labels` first and then use returned ids with `tasker_set_issue_labels`.",
     "",
     "## Card Writing",
     "",
     "- Keep card titles concise and operational.",
     "- Put current architecture, planned architecture, implementation notes, and validation into structured text blocks.",
-    "- Put short verifiable work items into checker blocks.",
+    "- Put each structured block heading into the block `title` field. Do not put markdown headings like `## Status` inside block body.",
+    "- Do not put headings inside block body. Wrong: body starts with `## Текущая архитектура`. Correct: `title: \"Текущая архитектура\"`, body contains only content.",
+    "- Put short verifiable work items into checker blocks with explicit titles.",
     "- After code work, update the related card with factual files touched and validation performed.",
     "",
+    "## Labels",
+    "",
+    "- Before assigning a new marker/label, check project context labels.",
+    "- If the label does not exist, call `tasker_ensure_labels` with the granted `project_id`.",
+    "- Use only label ids returned by project context or `tasker_ensure_labels` when calling `tasker_set_issue_labels`.",
+    "",
     "## Effective Grants",
     "",
     grants || "- No grants available.",
diff --git a/src/routes/tools.ts b/src/routes/tools.ts
index 3db32c3..fcd67fa 100644
--- a/src/routes/tools.ts
+++ b/src/routes/tools.ts
@@ -34,6 +34,22 @@ export async function registerToolRoutes(app: FastifyInstance, deps: ToolRouteDe
     return result.structuredContent;
   });
 
+  app.post("/api/v1/tools/projects/:projectId/labels/ensure", async (request) => {
+    const session = await authenticateAgent(request, deps);
+    const params = request.params as { projectId: string };
+    const result = await executeMcpTool(
+      session,
+      "tasker_ensure_labels",
+      {
+        ...requestBodyRecord(request.body),
+        project_id: params.projectId,
+      },
+      deps,
+      toolOptions(request)
+    );
+    return result.structuredContent;
+  });
+
   app.get("/api/v1/tools/issues", async (request) => {
     const session = await authenticateAgent(request, deps);
     const query = request.query as { project_id?: string; workspace_slug?: string; query?: string };
diff --git a/src/tasker/client.ts b/src/tasker/client.ts
index ac24d70..41e733c 100644
--- a/src/tasker/client.ts
+++ b/src/tasker/client.ts
@@ -83,6 +83,15 @@ export type SetLabelsInput = {
   label_ids: string[];
 };
 
+export type EnsureLabelsInput = {
+  project_id: string;
+  workspace_slug?: string | null;
+  labels: Array<{
+    name: string;
+    color?: string;
+  }>;
+};
+
 export type AssignIssueInput = {
   project_id: string;
   workspace_slug?: string | null;
@@ -177,6 +186,14 @@ export class TaskerClient {
     });
   }
 
+  async ensureLabels(session: AgentSessionRecord, input: EnsureLabelsInput): Promise<unknown> {
+    return this.request(`/api/internal/nodedc/agent/projects/${encodeURIComponent(input.project_id)}/labels/ensure`, {
+      method: "POST",
+      session,
+      body: input,
+    });
+  }
+
   async assignIssue(session: AgentSessionRecord, issueId: string, input: AssignIssueInput): Promise<unknown> {
     return this.request(`/api/internal/nodedc/agent/issues/${encodeURIComponent(issueId)}/assignees`, {
       method: "PUT",
@@ -217,6 +234,7 @@ export class TaskerClient {
     }
   ): Promise<Response> {
     try {
+      const requestBody = attachAgentMetadata(input.session, input.body);
       return await fetch(new URL(path, this.config.baseUrl), {
         method: input.method,
         headers: {
@@ -226,7 +244,7 @@ export class TaskerClient {
           "X-NODEDC-Agent-Owner-User-Id": input.session.agent.ownerUserId,
           "X-NODEDC-Agent-Token-Id": input.session.token.id,
         },
-        body: input.body === undefined ? undefined : JSON.stringify(input.body),
+        body: requestBody === undefined ? undefined : JSON.stringify(requestBody),
       });
     } catch (error) {
       throw new TaskerAdapterUnavailableError(error);
@@ -234,6 +252,24 @@ export class TaskerClient {
   }
 }
 
+function attachAgentMetadata(session: AgentSessionRecord, body: unknown): unknown {
+  if (body === undefined || !isPlainRecord(body)) {
+    return body;
+  }
+
+  return {
+    ...body,
+    _agent: {
+      display_name: session.agent.displayName,
+      avatar_url: session.agent.avatarUrl,
+    },
+  };
+}
+
+function isPlainRecord(value: unknown): value is Record<string, unknown> {
+  return typeof value === "object" && value !== null && !Array.isArray(value);
+}
+
 async function readResponsePayload(response: Response): Promise<unknown> {
   const text = await response.text();