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Summer 4.0 names every capability as an operation. The 3.x tool names keep working for all of 4.x: summer_call accepts them on every server, the hosted MCP serves the 3.x tools at https://mcp.summerengine.com/mcp?surface=v3, and the npm MCP lists them again with summer mcp --toolsets legacy (and by itself while your installed Summer skills are older than 4.0). A name with #action is one action of a 3.x tool that did several jobs; the 3.x action argument picks the operation. 238 names. Find a 3.x tool below; the link goes to the operation that does its job now, with its inputs and an example. The old 3.x tool pages (/mcp/tools/*) now open this page, at the row of the tool.