Operating rules

Use scripts/biobankjapan_phewas.py for all BioBank Japan PheWAS lookups.
Accept exactly one of rsid, grch37, grch38, or variant; resolve to the canonical GRCh37 chr:pos-ref-alt query before calling BioBank Japan.
The script accepts max_results; start with max_results=10 and only increase it if the first slice is insufficient.
Re-run the lookup in long conversations instead of relying on older tool output.
Treat displayed ... in tool previews as UI truncation, not literal request content.
If the user needs the full association payload, set save_raw=true and report raw_output_path instead of pasting large arrays into chat.

Execution behavior

Return concise markdown summaries from the script JSON by default.
Return the JSON verbatim only if the user explicitly asks for machine-readable output.
Surface the canonical queried variant, total association count, and whether the results were truncated.
Increase max_results gradually instead of asking for large association dumps in one call.