{
  "$schema": "../rpc-schema-draft.json",
  "type": "object",
  "rpc": "askrene-create-layer",
  "title": "Command to create a new layer",
  "added": "v24.11",
  "description": [
    "The **askrene-create-layer** RPC command tells askrene to create a new, empty layer.  This layer can then be populated with `askrene-create-channel` and `askrene-inform-channel`, and be used in `getroutes`."
  ],
  "request": {
    "required": [
      "layer"
    ],
    "additionalProperties": false,
    "properties": {
      "layer": {
        "type": "string",
        "description": [
          "The name of the layer to create."
        ]
      },
      "persistent": {
        "type": "boolean",
        "default": "False",
        "description": [
          "True if askrene should save and restore this layer.  As a side-effect, create-layer also succeeds if the layer already exists and persistent is true."
        ]
      }
    }
  },
  "response": {
    "required": [
      "layers"
    ],
    "additionalProperties": false,
    "properties": {
      "layers": {
        "type": "array",
        "items": {
          "type": "object",
          "additionalProperties": false,
          "required": [
            "layer",
            "persistent",
            "disabled_nodes",
            "created_channels",
            "channel_updates",
            "constraints"
          ],
          "properties": {
            "layer": {
              "type": "string",
              "description": [
                "The name of the layer."
              ]
            },
            "persistent": {
              "type": "boolean",
              "description": [
                "Whether the layer is saved/restored across restarts."
              ]
            },
            "disabled_nodes": {
              "type": "array",
              "items": {
                "type": "pubkey",
                "description": [
                  "The id of the disabled node."
                ]
              }
            },
            "disabled_channels": {
              "type": "array",
              "items": {
                "type": "short_channel_id_dir",
                "description": [
                  "The channel and direction which is disabled."
                ]
              }
            },
            "created_channels": {
              "type": "array",
              "items": {
                "type": "object",
                "required": [
                  "source",
                  "destination",
                  "short_channel_id",
                  "capacity_msat"
                ],
                "additionalProperties": false,
                "properties": {
                  "source": {
                    "type": "pubkey",
                    "description": [
                      "The source node id for the channel."
                    ]
                  },
                  "destination": {
                    "type": "pubkey",
                    "description": [
                      "The destination node id for the channel."
                    ]
                  },
                  "short_channel_id": {
                    "type": "short_channel_id",
                    "description": [
                      "The short channel id for the channel."
                    ]
                  },
                  "capacity_msat": {
                    "type": "msat",
                    "description": [
                      "The capacity (onchain size) of the channel."
                    ]
                  }
                }
              }
            },
            "channel_updates": {
              "type": "array",
              "items": {
                "type": "object",
                "required": [
                  "short_channel_id_dir"
                ],
                "additionalProperties": false,
                "properties": {
                  "htlc_minimum_msat": {
                    "type": "msat",
                    "description": [
                      "The minimum value allowed in this direction."
                    ]
                  },
                  "htlc_maximum_msat": {
                    "type": "msat",
                    "description": [
                      "The maximum value allowed in this direction."
                    ]
                  },
                  "fee_base_msat": {
                    "type": "msat",
                    "description": [
                      "The base fee to apply to use the channel in this direction."
                    ]
                  },
                  "fee_proportional_millionths": {
                    "type": "u32",
                    "description": [
                      "The proportional fee (in parts per million) to apply to use the channel in this direction."
                    ]
                  },
                  "delay": {
                    "type": "u16",
                    "description": [
                      "The CLTV delay required for this direction."
                    ]
                  }
                }
              }
            },
            "constraints": {
              "type": "array",
              "items": {
                "type": "object",
                "required": [
                  "short_channel_id",
                  "direction"
                ],
                "additionalProperties": false,
                "properties": {
                  "short_channel_id": {
                    "type": "short_channel_id",
                    "description": [
                      "The short channel id."
                    ]
                  },
                  "direction": {
                    "type": "u32",
                    "description": [
                      "The direction."
                    ]
                  },
                  "maximum_msat": {
                    "type": "msat",
                    "description": [
                      "The maximum value which this channel could pass.  This or *minimum_msat* will be present, but not both."
                    ]
                  },
                  "minimum_msat": {
                    "type": "msat",
                    "description": [
                      "The minimum value which this channel could pass.  This or *minimum_msat* will be present, but not both."
                    ]
                  }
                }
              }
            },
            "biases": {
              "type": "array",
              "items": {
                "type": "object",
                "required": [
                  "short_channel_id_dir",
                  "bias",
                  "timestamp"
                ],
                "additionalProperties": false,
                "properties": {
                  "short_channel_id_dir": {
                    "type": "short_channel_id_dir",
                    "description": [
                      "The short channel id and direction"
                    ]
                  },
                  "bias": {
                    "type": "integer",
                    "description": [
                      "The bias (-100 to +100)"
                    ]
                  },
                  "description": {
                    "type": "string",
                    "description": [
                      "Description/annotation to display in askrene-listlayers(7)"
                    ]
                  },
                  "timestamp": {
                    "type": "u64",
                    "added": "v25.12",
                    "description": [
                      "The UNIX timestamp when this bias was created."
                    ]
                  }
                }
              }
            },
            "node_biases": {
              "added": "v25.12",
              "type": "array",
              "items": {
                "type": "object",
                "required": [
                  "node",
                  "in_bias",
                  "out_bias",
                  "timestamp"
                ],
                "additionalProperties": false,
                "properties": {
                  "node": {
                    "added": "v25.12",
                    "type": "pubkey",
                    "description": [
                      "The id of the biased node."
                    ]
                  },
                  "in_bias": {
                    "added": "v25.12",
                    "type": "integer",
                    "description": [
                      "The bias (-100 to +100) on incoming channels."
                    ]
                  },
                  "out_bias": {
                    "added": "v25.12",
                    "type": "integer",
                    "description": [
                      "The bias (-100 to +100) on outgoing channels."
                    ]
                  },
                  "description": {
                    "added": "v25.12",
                    "type": "string",
                    "description": [
                      "A human readable annotation."
                    ]
                  },
                  "timestamp": {
                    "added": "v25.12",
                    "type": "u64",
                    "description": [
                      "The UNIX timestamp when this bias was created or last updated."
                    ]
                  }
                }
              }
            }
          }
        }
      }
    }
  },
  "see_also": [
    "lightning-askrene-remove-layer(7)",
    "lightning-getroutes(7)",
    "lightning-askrene-create-channel(7)",
    "lightning-askrene-inform-channel(7)",
    "lightning-askrene-listlayers(7)",
    "lightning-askrene-age(7)"
  ],
  "author": [
    "Rusty Russell [rusty@rustcorp.com.au](mailto:rusty@rustcorp.com.au) is mainly responsible."
  ],
  "resources": [
    "Main web site: [https://github.com/ElementsProject/lightning](https://github.com/ElementsProject/lightning)"
  ],
  "examples": [
    {
      "request": {
        "id": "example:askrene-create-layer#1",
        "method": "askrene-create-layer",
        "params": {
          "layer": "test_layers"
        }
      },
      "response": {
        "layers": [
          {
            "layer": "test_layers",
            "persistent": false,
            "disabled_nodes": [],
            "created_channels": [],
            "channel_updates": [],
            "constraints": [],
            "biases": [],
            "node_biases": []
          }
        ]
      }
    }
  ]
}