refactor: Move BaseTool to main package and centralize tool description generation (#1514)

* move base_tool to main package and consolidate tool desscription generation

* update import path

* update tests

* update doc

* add base_tool test

* migrate agent delegation tools to use BaseTool

* update tests

* update import path for tool

* fix lint

* update param signature

* add from_langchain to BaseTool for backwards support of langchain tools

* fix the case where StructuredTool doesn't have func

---------

Co-authored-by: c0dez <li@vitablehealth.com>
Co-authored-by: Brandon Hancock (bhancock_ai) <109994880+bhancockio@users.noreply.github.com>

src/crewai/tools/cache_tools/cache_tools.py

@@ -0,0 +1,28 @@
+from pydantic import BaseModel, Field
+
+from crewai.agents.cache import CacheHandler
+
+
+class CacheTools(BaseModel):
+    """Default tools to hit the cache."""
+
+    name: str = "Hit Cache"
+    cache_handler: CacheHandler = Field(
+        description="Cache Handler for the crew",
+        default_factory=CacheHandler,
+    )
+
+    def tool(self):
+        from langchain.tools import StructuredTool
+
+        return StructuredTool.from_function(
+            func=self.hit_cache,
+            name=self.name,
+            description="Reads directly from the cache",
+        )
+
+    def hit_cache(self, key):
+        split = key.split("tool:")
+        tool = split[1].split("|input:")[0].strip()
+        tool_input = split[1].split("|input:")[1].strip()
+        return self.cache_handler.read(tool, tool_input)