Update readme with latest options

airflow-mcp-server/README.md

@@ -18,7 +18,6 @@ A [Model Context Protocol](https://modelcontextprotocol.io/) server for controll
         "airflow-mcp-server"
       ],
       "env": {
-        "OPENAPI_SPEC": "<path_to_spec.yaml>",
         "AIRFLOW_BASE_URL": "http://<host:port>/api/v1",
         "AUTH_TOKEN": "<base64_encoded_username_password>"
       }
@@ -27,13 +26,29 @@ A [Model Context Protocol](https://modelcontextprotocol.io/) server for controll
 }
 ```
 
+### Operation Modes
+
+The server supports two operation modes:
+
+- **Safe Mode** (`--safe`): Only allows read-only operations (GET requests). This is useful when you want to prevent any modifications to your Airflow instance.
+- **Unsafe Mode** (`--unsafe`): Allows all operations including modifications. This is the default mode.
+
+To start in safe mode:
+```bash
+airflow-mcp-server --safe
+```
+
+To explicitly start in unsafe mode (though this is default):
+```bash
+airflow-mcp-server --unsafe
+```
 
 ### Considerations
 
 The MCP Server expects environment variables to be set:
 - `AIRFLOW_BASE_URL`: The base URL of the Airflow API
 - `AUTH_TOKEN`: The token to use for authorization (_This should be base64 encoded username:password_)
-- `OPENAPI_SPEC`: The path to the OpenAPI spec file
+- `OPENAPI_SPEC`: The path to the OpenAPI spec file (_Optional_) (_defaults to latest stable release_)
 
 *Currently, only Basic Auth is supported.*
 
@@ -45,6 +60,7 @@ The default is 100 items, but you can change it using `maximum_page_limit` optio
 
 - [x] First API
 - [x] Parse OpenAPI Spec
+- [x] Safe/Unsafe mode implementation
 - [ ] Parse proper description with list_tools.
 - [ ] Airflow config fetch (_specifically for page limit_)
 - [ ] Env variables optional (_env variables might not be ideal for airflow plugins_)