The local get_page_content agent tool only converted DocumentNotFoundError
into a JSON error; a malformed page spec ("all", "5-") let parse_pages'
ValueError surface as the agent SDK's generic non-fatal tool-failure text
("An error occurred... invalid literal for int()"), which the model can't
act on. Catch (ValueError, AttributeError) and return the same actionable
"Invalid pages format: ... Use '5-7', '3,8', or '12'" message the legacy
retrieval tool already gives, so the model can retry with a valid range.
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