The Site Diagnostics tool informs you whether Google's crawler is able to access your site to offer relevant ads. Using this tool, you can review the errors of google crawler encountered for certain blocked URLs and correct them. However, the flaws in the Site Diagnostics tool have been exposed in the Search Engine Roundtable Forums recently. A member pointed out that the Site Diagnostics report has some wierd errors.

A Search Engine Roundtable post elaborated, “It appears the ads are trying to be generated via the Google Cache, example cache link in report shows us that it is the Google Cache. And we know that the robots.txt file at Google disallows spiders from crawling those pages.”

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