diff --git a/control-pipeline/api/control_generator_routes.py b/control-pipeline/api/control_generator_routes.py
index 13d420d..e1a0df4 100644
--- a/control-pipeline/api/control_generator_routes.py
+++ b/control-pipeline/api/control_generator_routes.py
@@ -2293,6 +2293,67 @@ async def get_batch_process_status(job_id: str):
     return status
 
 
+class RunPass0aRequest(BaseModel):
+    limit: int = 0  # 0 = no limit
+    batch_size: int = 5
+    use_anthropic: bool = True
+    category_filter: Optional[str] = None
+    source_filter: Optional[str] = None
+
+
+_pass0a_status: dict = {}
+
+
+async def _run_pass0a_background(req: RunPass0aRequest, job_id: str):
+    """Run Pass 0a in background with own DB session."""
+    from services.decomposition_pass import DecompositionPass
+    db = SessionLocal()
+    try:
+        _pass0a_status[job_id] = {"status": "running"}
+        dp = DecompositionPass(db)
+        result = await dp.run_pass0a(
+            limit=req.limit,
+            batch_size=req.batch_size,
+            use_anthropic=req.use_anthropic,
+            category_filter=req.category_filter,
+            source_filter=req.source_filter,
+        )
+        _pass0a_status[job_id] = {"status": "completed", **result}
+        logger.info("Pass 0a job %s completed: %s", job_id, result)
+    except Exception as e:
+        logger.error("Pass 0a job %s failed: %s", job_id, e)
+        _pass0a_status[job_id] = {"status": "failed", "error": str(e)}
+    finally:
+        db.close()
+
+
+@router.post("/generate/run-pass0a")
+async def run_pass0a(req: RunPass0aRequest):
+    """Run Pass 0a (Obligation Extraction) on undecomposed controls.
+
+    Extracts individual normative obligations from rich controls using LLM.
+    Runs in background — poll status via GET /generate/pass0a-status/{job_id}.
+    """
+    import uuid
+    job_id = str(uuid.uuid4())[:8]
+    _pass0a_status[job_id] = {"status": "starting"}
+    asyncio.create_task(_run_pass0a_background(req, job_id))
+    return {
+        "status": "running",
+        "job_id": job_id,
+        "message": f"Pass 0a started. Poll /generate/pass0a-status/{job_id}",
+    }
+
+
+@router.get("/generate/pass0a-status/{job_id}")
+async def get_pass0a_status(job_id: str):
+    """Get status of a Pass 0a job."""
+    status = _pass0a_status.get(job_id)
+    if not status:
+        raise HTTPException(status_code=404, detail="Pass 0a job not found")
+    return status
+
+
 class SubmitPass0bRequest(BaseModel):
     limit: int = 10
     batch_size: int = 5