diff --git a/src/blackboard/queries.py b/src/blackboard/queries.py
new file mode 100644
index 0000000..3b7470d
--- /dev/null
+++ b/src/blackboard/queries.py
@@ -0,0 +1,114 @@
+"""黑板读操作（查询封装）"""
+
+from __future__ import annotations
+
+import json
+from pathlib import Path
+from typing import Any, Dict, List, Optional
+
+from .db import get_connection
+from .models import Task
+
+
+class Queries:
+    """黑板查询（只读）"""
+
+    def __init__(self, db_path: Path):
+        self.db_path = db_path
+
+    def _conn(self):
+        return get_connection(self.db_path)
+
+    def task_summary(self) -> Dict[str, int]:
+        """任务状态汇总"""
+        conn = self._conn()
+        try:
+            rows = conn.execute(
+                "SELECT status, COUNT(*) as cnt FROM tasks GROUP BY status"
+            ).fetchall()
+            return {r["status"]: r["cnt"] for r in rows}
+        finally:
+            conn.close()
+
+    def tasks_by_assignee(self, assignee: str) -> List[Task]:
+        """查询某 Agent 的任务"""
+        conn = self._conn()
+        try:
+            rows = conn.execute(
+                "SELECT * FROM tasks WHERE assignee=? ORDER BY priority ASC",
+                (assignee,),
+            ).fetchall()
+            return [Task.from_row(r) for r in rows]
+        finally:
+            conn.close()
+
+    def blocked_tasks_with_deps(self) -> List[Dict[str, Any]]:
+        """查询 blocked 任务及其依赖"""
+        conn = self._conn()
+        try:
+            rows = conn.execute(
+                "SELECT * FROM tasks WHERE status='blocked'"
+            ).fetchall()
+            result = []
+            for r in rows:
+                deps = json.loads(r["depends_on"] or "[]")
+                if deps:
+                    dep_rows = conn.execute(
+                        f"SELECT id, status FROM tasks WHERE id IN ({','.join('?' * len(deps))})",
+                        deps,
+                    ).fetchall()
+                    dep_info = {dr["id"]: dr["status"] for dr in dep_rows}
+                    all_done = all(s == "done" for s in dep_info.values())
+                else:
+                    dep_info = {}
+                    all_done = True
+                result.append({
+                    "task_id": r["id"],
+                    "title": r["title"],
+                    "depends_on": deps,
+                    "dep_status": dep_info,
+                    "all_deps_done": all_done,
+                })
+            return result
+        finally:
+            conn.close()
+
+    def pending_dispatchable(self) -> List[Task]:
+        """查询可调度的 pending 任务（依赖已满足）"""
+        conn = self._conn()
+        try:
+            rows = conn.execute(
+                "SELECT * FROM tasks WHERE status='pending' ORDER BY priority ASC"
+            ).fetchall()
+            result = []
+            for r in rows:
+                deps = json.loads(r["depends_on"] or "[]")
+                if not deps:
+                    result.append(Task.from_row(r))
+                    continue
+                # 检查依赖是否全部完成
+                placeholders = ",".join("?" * len(deps))
+                dep_rows = conn.execute(
+                    f"SELECT id FROM tasks WHERE id IN ({placeholders}) AND status='done'",
+                    deps,
+                ).fetchall()
+                if len(dep_rows) == len(deps):
+                    result.append(Task.from_row(r))
+            return result
+        finally:
+            conn.close()
+
+    def recent_events(self, limit: int = 20) -> List[Dict[str, Any]]:
+        """最近事件"""
+        conn = self._conn()
+        try:
+            rows = conn.execute(
+                "SELECT * FROM events ORDER BY created_at DESC LIMIT ?",
+                (limit,),
+            ).fetchall()
+            return [dict(r) for r in rows]
+        finally:
+            conn.close()
+
+    def db_size_bytes(self) -> int:
+        return self.db_path.stat().st_size if self.db_path.exists() else 0