Small RC Fixes (#608)

* mentioning ollama on the docs as embedder

* lowering barrier to match tool with simialr name

* Fixing agent tools to support co_worker

* Adding new tests

* Fixing type"

* updating tests

* fixing conflict

docs/tools/GitHubSearchTool.md

@@ -55,7 +55,7 @@ tool = GithubSearchTool(
             ),
         ),
         embedder=dict(
-            provider="google",
+            provider="google", # or openai, ollama, ...
             config=dict(
                 model="models/embedding-001",
                 task_type="retrieval_document",