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config.example.yaml documents web_fetch timeout/fetch_time/navigation_timeout and the two search_time_range options as seconds, and a $VAR reference resolves verbatim from the environment, so any of them can reach InfoQuestClient as a string. The client compares each with 0, which raises TypeError for a string, None or a mapping and takes the whole web_fetch/web_search/image_search call down. Reuse the provider-local coercion the sibling tools already have: accept an int, integral float or integer-form string, otherwise warn and keep the documented -1 (no filter).