web-mcp-flow.vercel.app

insert_node_between

Insert a new node onto an existing edge, splitting it. `sourceId` and `targetId` MUST already be joined by a direct edge in that direction (source → target) — this tool removes that edge and reconnects source → newNode → target. The original edge's decision handle ("yes"/"no"), if any, is preserved on the source → newNode edge. The new node is placed at the midpoint of the two. Takes node IDs, not labels: call get_flow_state first to resolve a label like "check auth" to its id, and to read edge directions. Valid node types: "start_end" (rounded pill; data.variant is "start" or "end"), "process" (rectangle; optional data.description), "decision" (diamond; optional data.condition; has two source handles "yes" and "no"), "io" (parallelogram; optional data.description), "note" (dashed box, annotation only — cannot be connected). Returns { success: true, newNodeId }, or { success: false, error } with a specific reason ("... does not exist" vs "no direct edge from sourceId to targetId").

Input schema

{
  "type": "object",
  "properties": {
    "sourceId": {
      "type": "string"
    },
    "targetId": {
      "type": "string"
    },
    "newNodeType": {
      "type": "string",
      "enum": [
        "start_end",
        "process",
        "decision",
        "io",
        "note"
      ]
    },
    "newNodeLabel": {
      "type": "string"
    }
  },
  "required": [
    "sourceId",
    "targetId",
    "newNodeType",
    "newNodeLabel"
  ],
  "additionalProperties": false
}