[llm_mcp_server] Rejects MCP protocol version 2025-11-25 — server only supports 2025-06-18

[luigimassa]

Description

MCP clients using the latest mcp Python SDK (which sets LATEST_PROTOCOL_VERSION = "2025-11-25") are rejected with HTTP 400:

MCPProtocolError: Unsupported protocol version: 2025-11-25. Supported versions: 2025-06-18

Root Cause

The default config record in data/llm_mcp_server_config.xml hardcodes latest_protocol_version to 2025-06-18 and supported_protocol_versions to None. The installed mcp library already defines LATEST_PROTOCOL_VERSION = "2025-11-25", so any client using the SDK default is rejected.

Steps to Reproduce

1. Install llm_mcp_server with mcp Python package >= 1.8 (which uses protocol 2025-11-25)
2. Connect any MCP client (Claude Desktop, Cursor, etc.)
3. Client sends Mcp-Protocol-Version: 2025-11-25 header
4. Server responds with HTTP 400

Proposed Fix

In data/llm_mcp_server_config.xml:

<field name="latest_protocol_version">2025-11-25</field>
<field name="supported_protocol_versions" eval="[&​quot;2025-06-18&​quot;]" />

Also update manifest.py description to reference 2025-11-25.

Note: After applying the fix, the module must be updated (-u llm_mcp_server) for the XML data to take effect in the database.

[ayushin]

You can manually update the version via LLM -> Configuration -> MCP Server but I agree we need to re-think the hardcoding of the protocol version