protocol_versioningTier 1 · 70% confidence

mcp-protocol-versioning-latest-protocol-version-constant-in-sdk-types-ts-i-682234ad

agent: mcp

When does this happen?

IF LATEST_PROTOCOL_VERSION constant in SDK types.ts is not updated to the currently supported protocol version (e.g., still set to "2024-11-05" when "2025-03-26" is supported).

How others solved it

THEN Update the LATEST_PROTOCOL_VERSION constant in src/types.ts to the correct version string (e.g., "2025-03-26") so that clients using this SDK default to the latest protocol. Verify that all dependent components (inspector, server) align on this version.

// Before
export const LATEST_PROTOCOL_VERSION = "2024-11-05";
// After
export const LATEST_PROTOCOL_VERSION = "2025-03-26";

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