List plays

List every system play available across the platform. A "play" is a reusable, system-shipped step (source, enrichment, qualification, copy, routing, destination) that workflows compose into pipelines. Each entry returns id, name, description, category, sideEffectLevel, agent role, required tools, and the approval policy. Read-only and global (no workspace scoping). Use this BEFORE compile-workflow-from-prompt to see what building blocks the compiler can choose from.

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "list-plays",
    "arguments": {}
  }
}