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MCP pagination bug quietly hides server catalogs

A bug in the MCP pagination specification, specifically concerning the handling of empty `nextCursor` values, can lead to incomplete data retrieval. Developers using C# with nullable response models may encounter this issue, where an empty cursor string is incorrectly treated as a signal to stop pagination, rather than a valid token to request the next page. This can result in a client only receiving the first page of results, potentially masking a larger catalog of available tools or resources. The fix involves ensuring the pagination loop correctly distinguishes between a null `nextCursor`, which signifies the end of traversal, and an empty string, which indicates that another request should be made. AI

IMPACT This is a technical bug fix for a specific software protocol and has no direct impact on AI operations.

RANK_REASON Technical bug report and fix for a specific software protocol.

Read on dev.to — MCP tag →

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MCP pagination bug quietly hides server catalogs

COVERAGE [1]

  1. dev.to — MCP tag TIER_1 English(EN) · Sukhpinder Singh ·

    MCP Pagination Empty `nextCursor`: Don't Stop After Page One

    <p>MCP pagination empty <code>nextCursor</code> handling looks like a tiny null check, but the wrong predicate can hide most of a server's catalog. In the final 2026-07-28 specification, cursors are opaque strings. An empty string is valid; only a missing <code>nextCursor</code> …