Return paper list with title (and abstract). Source of each paper is also provided.

Args:
    query: Search keywords.
    mode: Result display mode: "title_only" (default), "abbr_abs" (abbreviated abstracts), or "full_abs" (full abstracts).
    order_by: "relevance" (default) or "date" (relevance-tiered, then newest first).
    page: 1-based page number (mutually exclusive with start_from).
    start_from: Paper index (not page index) to start from (mutually exclusive with page).

Get the table of contents of a paper. Always call this tool FIRST before reading a paper's content, then use grep_paper_content to read specific chapters or search for content.

Return the table of contents of the designated paper.

Args:
    title: Paper title (supports fuzzy matching, but provide as accurately as possible).

Grep patterns in the full converted markdown text of a paper. Pipes the paper's parsed markdown as stdin to the given grep command.

Returns the stdout of the grep command.

Args:
    title: Paper title (supports fuzzy matching, but provide as accurately as possible).
    grep_command: Full grep command to run. Paper markdown is piped as stdin. Examples:
        - 'grep -A 150 "3 METHODOLOGY"' to read a whole section
        - 'grep -i -C 3 "learning rate"' shows 3 lines of context around it
        - 'grep -A 10 "Equation 1"' to locate equations or figures
        Note: First call `get_paper_toc` to get the exact section names (e.g., "3 METHODOLOGY", "4.2 Baseline").
    max_chars: Max output characters (default 6000).