diff --git a/backend/routers/chronik.py b/backend/routers/chronik.py
index 6ca8b93..3fac301 100644
--- a/backend/routers/chronik.py
+++ b/backend/routers/chronik.py
@@ -3,6 +3,8 @@ Quelle ist der persistente Melde-Briefkasten (services/announce.py): Health-Wäc
 Auto-Updates, Erinnerungen, Radar/Traum/Chef-Gutachter-Crons, Auftragsbuch — alle
 autonomen Kanäle laufen dort bereits durch. Hier wird nichts Neues erhoben, nur erzählt."""
 
+from pydantic import BaseModel
+
 from fastapi import APIRouter
 
 from services import announce
@@ -10,6 +12,19 @@ from services import announce
 router = APIRouter(prefix="/api")
 
 
-@router.get("/chronik")
+class ChronikItem(BaseModel):
+    id: int
+    ts: float
+    subject: str
+    text: str
+    source: str
+    priority: str
+
+
+class ChronikResponse(BaseModel):
+    items: list[ChronikItem]
+
+
+@router.get("/chronik", response_model=ChronikResponse)
 def chronik(limit: int = 150) -> dict:
     return {"items": announce.list_recent(limit)}
diff --git a/backend/routers/eigenleben.py b/backend/routers/eigenleben.py
index ed7efcb..6fb9fd4 100644
--- a/backend/routers/eigenleben.py
+++ b/backend/routers/eigenleben.py
@@ -1,4 +1,6 @@
-"""Eigenleben-Endpoints — „Von allein"-Ansicht (Skills + Vorschlags-Bilanz), read-only."""
+"""Eigenleben-Endpoints — „Von allein“-Ansicht (Skills + Vorschlags-Bilanz), read-only."""
+
+from pydantic import BaseModel
 
 from fastapi import APIRouter, HTTPException
 
@@ -7,7 +9,36 @@ from services import eigenleben
 router = APIRouter(prefix="/api")
 
 
-@router.get("/eigenleben")
+class SkillItem(BaseModel):
+    id: str
+    name: str
+    kategorie: str | None
+    aktiv: bool | None
+    beschreibung: str
+    version: str
+    autor: str
+    herkunft: str
+    herkunft_label: str
+    genutzt: int
+    zuletzt_genutzt: str | None
+    erstellt: str | None
+    status: str
+    geaendert: float
+
+
+class EigenlebenOverviewResponse(BaseModel):
+    available: bool
+    skills: list[SkillItem]
+    selbst_erstellt: int
+    bilanz: dict
+
+
+class SkillTextResponse(BaseModel):
+    id: str
+    text: str
+
+
+@router.get("/eigenleben", response_model=EigenlebenOverviewResponse)
 def get_overview() -> dict:
     return eigenleben.overview()
 
@@ -17,7 +48,7 @@ def get_overview() -> dict:
 # fällt in den SPA-Fallback (index.html, Status 200) und die UI zeigt „Konnte den
 # Skill-Text nicht laden". Die Pfad-Validierung (max. eine Ebene, keine . /..) macht
 # services.eigenleben.skill_text.
-@router.get("/eigenleben/skill/{skill_id:path}")
+@router.get("/eigenleben/skill/{skill_id:path}", response_model=SkillTextResponse)
 def get_skill(skill_id: str) -> dict:
     text = eigenleben.skill_text(skill_id)
     if text is None:
diff --git a/backend/routers/health.py b/backend/routers/health.py
index 1c7a7a4..36a4a85 100644
--- a/backend/routers/health.py
+++ b/backend/routers/health.py
@@ -1,5 +1,7 @@
 """Health-/Status-Endpoint — schlanker Lebenszeichen-Check für MC 2.0."""
 
+from pydantic import BaseModel
+
 from fastapi import APIRouter
 
 from config import VERSION
@@ -8,7 +10,15 @@ from services import gateway, llamaswap
 router = APIRouter(prefix="/api")
 
 
-@router.get("/health")
+class HealthResponse(BaseModel):
+    status: str
+    version: str
+    engine_reachable: bool
+    gateway_reachable: bool
+    brain: dict
+
+
+@router.get("/health", response_model=HealthResponse)
 def health() -> dict:
     return {
         "status": "ok",
diff --git a/backend/routers/reminders.py b/backend/routers/reminders.py
index d354664..13c0cde 100644
--- a/backend/routers/reminders.py
+++ b/backend/routers/reminders.py
@@ -2,9 +2,10 @@
 Konsument ist v.a. der Hermes-Agent via mcp_mc.py (reminder_create/list/delete);
 LAN-only wie alle MC2-Endpoints."""
 
-from fastapi import APIRouter, HTTPException
 from pydantic import BaseModel
 
+from fastapi import APIRouter, HTTPException
+
 from services import reminders
 
 router = APIRouter(prefix="/api")
@@ -16,7 +17,20 @@ class ReminderIn(BaseModel):
     repeat: str = ""   # '' einmalig | daily | weekdays | weekly
 
 
-@router.get("/reminders")
+class ReminderOut(BaseModel):
+    id: int
+    text: str
+    next_ts: float
+    repeat: str
+    created_ts: float
+    when_local: str
+
+
+class ReminderListResponse(BaseModel):
+    items: list[ReminderOut]
+
+
+@router.get("/reminders", response_model=ReminderListResponse)
 def list_reminders() -> dict:
     return {"items": reminders.list_all()}
 
diff --git a/backend/routers/wissen.py b/backend/routers/wissen.py
index ac1b84f..391af87 100644
--- a/backend/routers/wissen.py
+++ b/backend/routers/wissen.py
@@ -6,6 +6,8 @@ import os
 import time
 from pathlib import Path
 
+from pydantic import BaseModel
+
 from fastapi import APIRouter, HTTPException
 
 router = APIRouter(prefix="/api")
@@ -30,7 +32,27 @@ def _title_of(p: Path) -> str:
     return p.stem
 
 
-@router.get("/wissen")
+class VaultFile(BaseModel):
+    path: str
+    name: str
+    dir: str
+    title: str
+    mtime: float
+    neu: bool
+
+
+class WissenListResponse(BaseModel):
+    available: bool
+    files: list[VaultFile]
+
+
+class WissenFileResponse(BaseModel):
+    path: str
+    content: str
+    mtime: float
+
+
+@router.get("/wissen", response_model=WissenListResponse)
 def list_vault() -> dict:
     """Alle Markdown-Notizen des Vaults (relativer Pfad, Titel, Ordner, Alter)."""
     if not _available():
@@ -54,7 +76,7 @@ def list_vault() -> dict:
     return {"available": True, "files": files}
 
 
-@router.get("/wissen/datei")
+@router.get("/wissen/datei", response_model=WissenFileResponse)
 def read_file(pfad: str) -> dict:
     """Inhalt einer Vault-Notiz — Traversal hart geblockt (resolve + is_relative_to)."""
     if not _available():