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* fix(sandbox): stop remote grep/glob from reporting failures as no matches E2B, OpenSandbox, BoxLite and Tenki ran grep/find behind `2>/dev/null | head`, so a missing search root, a missing grep/find binary or an unreadable tree exited 0 with empty stdout and the tools reported "No matches found". Wrap the search in sandbox/remote_search.py, which checks the root first and records the search's own status after head, as remote_list_dir does for list_dir: a missing root raises FileNotFoundError, a failed search raises OSError, and a genuine no-match still returns []. glob's find gains -H for symlinked roots, OpenSandbox's BusyBox fallback keeps the primary grep status, and E2B no longer swallows client errors. Regression tests run each provider's real command in a local POSIX sh. Fixes #5376 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * fix(sandbox): fail remote grep/glob on partial traversal errors grep 2 / find 1 after some results were printed (an unreadable file or subdirectory) were returned as a complete search. Callers have no partial-result channel, and #5376 asks for permission and command failures to raise, so these statuses now raise OSError like any other failure. Only grep 0/1/141 and find 0/141 pass. The error for grep 2 / find 1 says that some files or directories could not be read and asks for a narrower path, so the agent can retry instead of giving up. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> --------- Co-authored-by: Totoro-qaq <279883115+Totoro-qaq@users.noreply.github.com> Co-authored-by: Claude Opus 5 <noreply@anthropic.com>