diff --git a/api/scripts/sessions-patterns.ts b/api/scripts/sessions-patterns.ts
index 4f36b59..34150f9 100644
--- a/api/scripts/sessions-patterns.ts
+++ b/api/scripts/sessions-patterns.ts
@@ -9,14 +9,14 @@
  *   1. Resolver intervalo da semana (segunda 00:00 UTC → domingo 23:59 UTC)
  *   2. Correr detectPatterns (6 detectores heurísticos)
  *   3. Persistir com upsertPattern + consecutive_weeks
- *   4. Se --publish: POST comentário HTML para Desk discussion #32,
- *      e para padrões com consecutive_weeks>=3 e severity∈(warning,action)
- *      abrir Ticket no Desk.
+ *   4. Se --publish: chamar gateway MCP (desk-crm) para publicar comentário HTML
+ *      na discussão #32, e para padrões com consecutive_weeks>=3 e
+ *      severity∈(warning,action) abrir Ticket no Desk.
  *   5. Output JSON-line final com contagens.
  *
  * Env obrigatório com --publish:
- *   DESK_API_TOKEN   Token API Desk CRM
- *   DESK_BASE_URL    Base URL (default https://desk.descomplicar.pt)
+ *   MCP_GATEWAY_TOKEN  Bearer token do gateway MCP
+ *   MCP_GATEWAY_URL    URL do MCP desk-crm (default https://gateway.descomplicar.pt/v1/desk-crm/mcp)
  */
 import { openSessionsDb, type PatternRecord } from '../services/sessions/db.js'
 import { DEFAULT_DB_PATH } from '../services/sessions/indexer.js'
@@ -24,7 +24,6 @@ import {
   detectPatterns,
   toPatternRecord,
   weekRange,
-  weekIso as computeWeekIso,
   type Pattern,
 } from '../services/sessions/patterns.js'
 
@@ -34,6 +33,18 @@ interface Args {
   force: boolean
 }
 
+interface MCPToolCallResult {
+  content?: Array<{ type: string; text: string }>
+  isError?: boolean
+}
+
+/** Staff ID usado para publicar comentários automáticos (Observabilidade) */
+const OBSERVABILIDADE_STAFF_ID = 25
+/** Discussão Desk onde os resumos semanais são publicados */
+const OBSERVABILIDADE_DISCUSSION_ID = 32
+/** Departamento "Geral" no Desk CRM (id=1) */
+const OBSERVABILIDADE_DEPARTMENT_ID = 1
+
 function parseArgs(argv: string[]): Args {
   const a: Args = { publish: false, force: false }
   for (let i = 0; i < argv.length; i++) {
@@ -64,7 +75,7 @@ function escapeHtml(s: string): string {
   return s.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;')
 }
 
-function buildDiscussionHtml(weekIso: string, patterns: PatternRecord[], baseUrl: string): string {
+function buildDiscussionHtml(weekIso: string, patterns: PatternRecord[]): string {
   const dateStr = new Date().toISOString().slice(0, 10)
   const lines: string[] = []
   lines.push(`<h4>Semana ${weekIso} — Padrões Detectados Automaticamente</h4>`)
@@ -95,25 +106,70 @@ function buildDiscussionHtml(weekIso: string, patterns: PatternRecord[], baseUrl
   return lines.join('\n')
 }
 
-async function postDeskDiscussionComment(baseUrl: string, token: string, html: string): Promise<unknown> {
-  const res = await fetch(`${baseUrl.replace(/\/$/, '')}/api/v1/discussions/32/comments`, {
+/**
+ * Chama uma ferramenta do gateway MCP (JSON-RPC 2.0 sobre HTTP).
+ * O gateway pode responder em SSE (text/event-stream) ou JSON — tratamos ambos.
+ */
+async function callMcpTool(tool: string, args: Record<string, unknown>): Promise<MCPToolCallResult> {
+  const url = process.env.MCP_GATEWAY_URL ?? 'https://gateway.descomplicar.pt/v1/desk-crm/mcp'
+  const token = process.env.MCP_GATEWAY_TOKEN
+  if (!token) throw new Error('MCP_GATEWAY_TOKEN não definido')
+  const body = {
+    jsonrpc: '2.0',
+    id: Date.now(),
+    method: 'tools/call',
+    params: { name: tool, arguments: args },
+  }
+  const res = await fetch(url, {
     method: 'POST',
     headers: {
+      Authorization: `Bearer ${token}`,
       'Content-Type': 'application/json',
-      authtoken: token,
+      Accept: 'application/json, text/event-stream',
     },
-    body: JSON.stringify({ content: html }),
+    body: JSON.stringify(body),
   })
   if (!res.ok) {
-    const body = await res.text().catch(() => '')
-    throw new Error(`Desk discussion POST falhou: ${res.status} ${body.slice(0, 200)}`)
+    const txt = await res.text().catch(() => '')
+    throw new Error(`MCP gateway ${res.status}: ${txt.slice(0, 300)}`)
   }
-  return res.json().catch(() => ({}))
+  const raw = await res.text()
+  // Responde JSON puro ou SSE (linhas "data: {...}")
+  let payload: string | null = null
+  for (const line of raw.split(/\r?\n/)) {
+    const trimmed = line.trim()
+    if (!trimmed) continue
+    if (trimmed.startsWith('data: ')) {
+      payload = trimmed.slice(6)
+      break
+    }
+    if (trimmed.startsWith('{')) {
+      payload = trimmed
+      break
+    }
+  }
+  if (!payload) throw new Error(`MCP resposta sem payload JSON: ${raw.slice(0, 200)}`)
+  const parsed = JSON.parse(payload) as { error?: unknown; result?: MCPToolCallResult }
+  if (parsed.error) throw new Error(`MCP error: ${JSON.stringify(parsed.error)}`)
+  const result = parsed.result as MCPToolCallResult | undefined
+  if (result?.isError) {
+    const txt = result.content?.map((c) => c.text).join('\n') ?? ''
+    throw new Error(`MCP tool ${tool} devolveu isError: ${txt.slice(0, 300)}`)
+  }
+  return result ?? {}
 }
 
-async function createDeskTicket(baseUrl: string, token: string, p: PatternRecord): Promise<unknown> {
+async function postDeskDiscussionComment(html: string): Promise<unknown> {
+  return callMcpTool('add_discussion_comment', {
+    discussion_id: OBSERVABILIDADE_DISCUSSION_ID,
+    content: html,
+    staff_id: OBSERVABILIDADE_STAFF_ID,
+  })
+}
+
+async function createDeskTicket(p: PatternRecord): Promise<unknown> {
   const priority = p.severity === 'action' ? 4 : 3 // 4=alta, 3=média
-  const body = [
+  const message = [
     `<p><strong>Padrão recorrente detectado automaticamente — ${p.consecutive_weeks} semanas consecutivas.</strong></p>`,
     `<p>${escapeHtml(p.description)}</p>`,
     `<ul>`,
@@ -125,28 +181,20 @@ async function createDeskTicket(baseUrl: string, token: string, p: PatternRecord
     `</ul>`,
     `<p><em>Sample sessions:</em> ${p.sample_session_ids.map((s) => `<code>${escapeHtml(s)}</code>`).join(', ')}</p>`,
   ].join('\n')
-  const res = await fetch(`${baseUrl.replace(/\/$/, '')}/api/v1/tickets`, {
-    method: 'POST',
-    headers: {
-      'Content-Type': 'application/json',
-      authtoken: token,
-    },
-    body: JSON.stringify({
-      subject: `Padrão recorrente: ${p.title}`,
-      body,
-      priority,
-      department: 1,
-    }),
+  return callMcpTool('create_ticket', {
+    subject: `Padrão recorrente: ${p.title}`,
+    message,
+    priority,
+    department: OBSERVABILIDADE_DEPARTMENT_ID,
   })
-  if (!res.ok) {
-    const t = await res.text().catch(() => '')
-    throw new Error(`Desk ticket POST falhou: ${res.status} ${t.slice(0, 200)}`)
-  }
-  return res.json().catch(() => ({}))
 }
 
 async function main(): Promise<void> {
   const args = parseArgs(process.argv.slice(2))
+  if (args.publish && !process.env.MCP_GATEWAY_TOKEN) {
+    console.error('[patterns] --publish requer MCP_GATEWAY_TOKEN. Aborta.')
+    process.exit(1)
+  }
   const dbPath = process.env.OBSERVABILIDADE_DB ?? DEFAULT_DB_PATH
   const db = openSessionsDb(dbPath)
 
@@ -177,35 +225,28 @@ async function main(): Promise<void> {
   let publishError: string | null = null
 
   if (args.publish) {
-    const baseUrl = process.env.DESK_BASE_URL ?? 'https://desk.descomplicar.pt'
-    const token = process.env.DESK_API_TOKEN
-    if (!token) {
-      publishError = 'DESK_API_TOKEN ausente'
-    } else {
-      try {
-        const html = buildDiscussionHtml(weekIso, records, baseUrl)
-        await postDeskDiscussionComment(baseUrl, token, html)
-        commentPosted = true
-        for (const rec of records) {
-          if (rec.consecutive_weeks >= 3 && (rec.severity === 'warning' || rec.severity === 'action')) {
-            try {
-              await createDeskTicket(baseUrl, token, rec)
-              ticketsCreated++
-            } catch (e) {
-              console.error(`[patterns] falha ao criar ticket para ${rec.pattern_key}:`, (e as Error).message)
-            }
+    try {
+      const html = buildDiscussionHtml(weekIso, records)
+      await postDeskDiscussionComment(html)
+      commentPosted = true
+      for (const rec of records) {
+        if (rec.consecutive_weeks >= 3 && (rec.severity === 'warning' || rec.severity === 'action')) {
+          try {
+            await createDeskTicket(rec)
+            ticketsCreated++
+          } catch (e) {
+            console.error(`[patterns] falha ao criar ticket para ${rec.pattern_key}:`, (e as Error).message)
           }
         }
-      } catch (e) {
-        publishError = (e as Error).message
       }
+    } catch (e) {
+      publishError = (e as Error).message
     }
   }
 
   // Dry-run: render HTML para stderr para verificação manual
   if (!args.publish) {
-    const baseUrl = process.env.DESK_BASE_URL ?? 'https://desk.descomplicar.pt'
-    const html = buildDiscussionHtml(weekIso, records, baseUrl)
+    const html = buildDiscussionHtml(weekIso, records)
     console.error('\n--- HTML (dry-run) ---')
     console.error(html)
     console.error('--- /HTML ---\n')
diff --git a/systemd/observabilidade-patterns.env.example b/systemd/observabilidade-patterns.env.example
index 32ed8a9..613075d 100644
--- a/systemd/observabilidade-patterns.env.example
+++ b/systemd/observabilidade-patterns.env.example
@@ -1,2 +1,2 @@
-DESK_API_TOKEN=coloca-token-aqui
-DESK_BASE_URL=https://desk.descomplicar.pt
+MCP_GATEWAY_TOKEN=coloca-token-aqui
+MCP_GATEWAY_URL=https://gateway.descomplicar.pt/v1/desk-crm/mcp