SurprisedDuck 4307cac966 Research: report empty search provider results clearly ...

Deep Research surfaced 'Error: unknown error' whenever every search
provider returned an empty result set without raising (e.g. SearXNG is
reachable but all its engines fail internally). _last_search_error was
only set on exceptions, so the empty-but-no-exception path left it unset
and the caller fell back to 'unknown error'.

Record an actionable reason on that path naming the providers that were
tried, so users can tell it's a search-backend problem rather than a
model problem. The provider-raised path is unchanged.

Re: #344.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

2026-06-02 20:34:25 +09:00

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