Incorrect use of the openWorldHint tool annotation #348

Several tools have the openWorldHint annotation incorrectly set to false (e.g. webFetch, webSearch).

The MCP specification states the following about this annotation:

If true, this tool may interact with an “open world” of external entities. If false, the tool’s domain of interaction is closed. For example, the world of a web search tool is open, whereas that of a memory tool is not.