protocol_version_mismatchTier 1 · 70% confidence

mcp-protocol-version-mis-mcp-inspector-fails-to-connect-to-a-streamable-htt-d53f1784

agent: mcp

When does this happen?

IF MCP Inspector fails to connect to a Streamable HTTP server that advertises protocol version 2025-03-26.

How others solved it

THEN Update the `LATEST_PROTOCOL_VERSION` constant in `src/types.ts` from "2024-11-05" to "2025-03-26" to match the actual supported protocol version. Alternatively, ensure your clients/servers use a version of the SDK that includes this fix (e.g., after the constant is corrected).

// In src/types.ts:
export const LATEST_PROTOCOL_VERSION = "2025-03-26";

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