list_scores_v2: meta.total reports 0 when data[] has rows

[shawnclybor]

Summary

list_scores_v2 returns meta.total: 0 (and likely item_count) even when data[] is non-empty. The raw REST endpoint reports correct counts.

Reproduction

mcp__langfuse__list_scores_v2(
    trace_id="<some-trace-id>",
    from_timestamp="2026-05-05T13:30:00Z",
    limit=20,
)

Returns:

{
  "data": [{ ... 1 score with name=1c-error-persistence ... }],
  "metadata": { "page": 1, "limit": 20, "item_count": 1, "total": 0 }
}

total: 0 despite data containing one row. Reproduced twice (2026-05-05 and 2026-05-06) against https://us.cloud.langfuse.com.

Expected

meta.total should equal the total matching score count for the filter (consistent with the raw REST endpoint GET /api/public/v2/scores, which returns correct totals for the same filter).

Workaround

Count len(data) directly — agents using this MCP for verification assertions are silently failing on meta.total == 0 checks.

Environment

• Package: langfuse-mcp via uvx --python 3.11 langfuse-mcp --read-only
• Langfuse instance: us.cloud.langfuse.com
• Caller: Claude Code agent via MCP stdio

Happy to test a fix or provide more reproduction data.