LDK MCP Server

Instructions

Implementation Reference

• src/index.ts:38-62 (registration)

  Registration of the eventHandlingTool in the MCP server's tools array.

  const tools = [
    generateInvoiceTool,
    payInvoiceTool,
    getChannelStatusTool,
    getNodeInfoTool,
    backupStateTool,
    keychainTestTool,
    backgroundTestTool,
    pushNotificationTool,
    biometricAuthTool,
    createChannelTool,
    closeChannelTool,
    getBalanceTool,
    decodeInvoiceTool,
    listPaymentsTool,
    estimateFeeTool,
    generateMnemonicTool,
    deriveAddressTool,
    getSwiftCodeTool,
    getArchitectureTool,
    testScenarioTool,
    networkGraphTool,
    eventHandlingTool,
    chainSyncTool,
  ];

• src/tools/eventHandling.ts:3-1813 (handler)

  The main tool handler. Defines the tool with name 'ldk_event_handling', input schema, and execute function that returns comprehensive Swift code examples for various LDK event handling scenarios based on the eventType parameter.

  export const eventHandlingTool: Tool = {
    name: 'ldk_event_handling',
    description: 'Get comprehensive LDK event handling patterns and implementations',
    inputSchema: {
      type: 'object',
      properties: {
        eventType: {
          type: 'string',
          enum: [
            'all_events',
            'payment_events',
            'channel_events',
            'funding_events',
            'spendable_outputs',
            'forwarding_events',
            'event_persistence'
          ],
          description: 'Type of event handling to get code for'
        }
      },
      required: ['eventType']
    },
    execute: async (args: any): Promise<ToolResult> => {
      const eventExamples: Record<string, string> = {
        all_events: `
  // Comprehensive LDK Event Handler
  import LightningDevKit
  import BitcoinDevKit
  
  class LDKEventHandler: Bindings.EventHandler {
      private let channelManager: Bindings.ChannelManager
      private let wallet: BitcoinDevKit.Wallet
      private let keysManager: Bindings.KeysManager
      private let networkGraph: Bindings.NetworkGraph
      private let logger: Bindings.Logger
      private let broadcaster: Bindings.BroadcasterInterface
      
      init(
          channelManager: Bindings.ChannelManager,
          wallet: BitcoinDevKit.Wallet,
          keysManager: Bindings.KeysManager,
          networkGraph: Bindings.NetworkGraph,
          logger: Bindings.Logger,
          broadcaster: Bindings.BroadcasterInterface
      ) {
          self.channelManager = channelManager
          self.wallet = wallet
          self.keysManager = keysManager
          self.networkGraph = networkGraph
          self.logger = logger
          self.broadcaster = broadcaster
          super.init()
      }
      
      override func handleEvent(event: Bindings.Event) {
          // Log all events
          logger.log(message: "Handling event: \\(event.getValueType())")
          
          switch event.getValueType() {
          // Payment Events
          case .PaymentClaimable:
              handlePaymentClaimable(event.getValueAsPaymentClaimable()!)
          case .PaymentClaimed:
              handlePaymentClaimed(event.getValueAsPaymentClaimed()!)
          case .PaymentSent:
              handlePaymentSent(event.getValueAsPaymentSent()!)
          case .PaymentFailed:
              handlePaymentFailed(event.getValueAsPaymentFailed()!)
          case .PaymentPathSuccessful:
              handlePaymentPathSuccessful(event.getValueAsPaymentPathSuccessful()!)
          case .PaymentPathFailed:
              handlePaymentPathFailed(event.getValueAsPaymentPathFailed()!)
          case .PaymentForwarded:
              handlePaymentForwarded(event.getValueAsPaymentForwarded()!)
              
          // Channel Events
          case .FundingGenerationReady:
              handleFundingGenerationReady(event.getValueAsFundingGenerationReady()!)
          case .ChannelReady:
              handleChannelReady(event.getValueAsChannelReady()!)
          case .ChannelClosed:
              handleChannelClosed(event.getValueAsChannelClosed()!)
          case .DiscardFunding:
              handleDiscardFunding(event.getValueAsDiscardFunding()!)
          case .OpenChannelRequest:
              handleOpenChannelRequest(event.getValueAsOpenChannelRequest()!)
              
          // HTLC Events
          case .HTLCIntercepted:
              handleHTLCIntercepted(event.getValueAsHTLCIntercepted()!)
          case .HTLCHandlingFailed:
              handleHTLCHandlingFailed(event.getValueAsHTLCHandlingFailed()!)
              
          // Output Events
          case .SpendableOutputs:
              handleSpendableOutputs(event.getValueAsSpendableOutputs()!)
              
          // Probe Events
          case .ProbeFailed:
              handleProbeFailed(event.getValueAsProbeFailed()!)
          case .ProbeSuccessful:
              handleProbeSuccessful(event.getValueAsProbeSuccessful()!)
              
          // Other Events
          case .PendingHTLCsForwardable:
              handlePendingHTLCsForwardable(event.getValueAsPendingHTLCsForwardable()!)
          case .BumpTransaction:
              handleBumpTransaction(event.getValueAsBumpTransaction()!)
          case .InvoiceRequestFailed:
              handleInvoiceRequestFailed(event.getValueAsInvoiceRequestFailed()!)
          case .ConnectionNeeded:
              handleConnectionNeeded(event.getValueAsConnectionNeeded()!)
              
          default:
              logger.log(message: "Unhandled event type: \\(event.getValueType())")
          }
          
          // Persist event for recovery
          persistEvent(event)
      }
      
      private func persistEvent(_ event: Bindings.Event) {
          // Store event for potential replay during recovery
          EventPersistence.shared.store(event: event)
      }
  }`.trim(),
  
        payment_events: `
  // Payment Event Handling
  import LightningDevKit
  import UserNotifications
  
  extension LDKEventHandler {
      // Payment Claimable - Incoming payment detected
      func handlePaymentClaimable(_ event: Bindings.Event.PaymentClaimable) {
          let paymentHash = event.getPaymentHash()
          let amountMsat = event.getClaimableAmountMsat()
          let purpose = event.getPurpose()
          let claimDeadline = event.getClaimDeadline()
          
          // Auto-claim the payment
          if let preimage = extractPaymentPreimage(purpose: purpose) {
              channelManager.claimFunds(paymentPreimage: preimage)
              
              // Log successful claim attempt
              logger.log(message: "Claiming payment: \\(Data(paymentHash).hexString) for \\(amountMsat) msat")
          }
          
          // Store pending payment
          PaymentStore.shared.storePendingPayment(
              paymentHash: Data(paymentHash).hexString,
              amountMsat: amountMsat,
              purpose: purpose,
              claimDeadline: claimDeadline
          )
          
          // Notify UI
          DispatchQueue.main.async {
              NotificationCenter.default.post(
                  name: .paymentClaimable,
                  object: nil,
                  userInfo: [
                      "paymentHash": Data(paymentHash).hexString,
                      "amountMsat": amountMsat,
                      "description": self.extractDescription(purpose: purpose)
                  ]
              )
          }
      }
      
      // Payment Claimed - Successfully received payment
      func handlePaymentClaimed(_ event: Bindings.Event.PaymentClaimed) {
          let paymentHash = event.getPaymentHash()
          let amountMsat = event.getAmountMsat()
          let purpose = event.getPurpose()
          let receivers = event.getReceivers()
          let htlcs = event.getHtlcs()
          
          // Update payment record
          PaymentStore.shared.markPaymentClaimed(
              paymentHash: Data(paymentHash).hexString,
              amountMsat: amountMsat,
              receivers: receivers,
              htlcs: htlcs
          )
          
          // Show notification
          showPaymentNotification(
              title: "Payment Received",
              body: "Received \\(amountMsat / 1000) sats",
              identifier: Data(paymentHash).hexString
          )
          
          // Update balance
          BalanceManager.shared.updateBalance()
          
          // Log for analytics
          Analytics.logPaymentReceived(
              amountMsat: amountMsat,
              paymentType: getPaymentType(purpose: purpose)
          )
      }
      
      // Payment Sent - Outgoing payment succeeded
      func handlePaymentSent(_ event: Bindings.Event.PaymentSent) {
          let paymentId = event.getPaymentId()
          let paymentPreimage = event.getPaymentPreimage()
          let paymentHash = event.getPaymentHash()
          let feePaidMsat = event.getFeePaidMsat()?.getValue() ?? 0
          
          // Update payment record
          PaymentStore.shared.markPaymentSent(
              paymentId: paymentId?.data.hexString,
              paymentHash: Data(paymentHash).hexString,
              preimage: Data(paymentPreimage).hexString,
              feeMsat: feePaidMsat
          )
          
          // Update UI
          DispatchQueue.main.async {
              NotificationCenter.default.post(
                  name: .paymentSent,
                  object: nil,
                  userInfo: [
                      "paymentHash": Data(paymentHash).hexString,
                      "feeMsat": feePaidMsat
                  ]
              )
          }
          
          // Log success
          logger.log(message: "Payment sent successfully. Fee: \\(feePaidMsat) msat")
      }
      
      // Payment Failed - Outgoing payment failed
      func handlePaymentFailed(_ event: Bindings.Event.PaymentFailed) {
          let paymentId = event.getPaymentId()
          let paymentHash = event.getPaymentHash()
          let reason = event.getReason()
          
          // Parse failure reason
          let failureReason = parsePaymentFailureReason(reason)
          
          // Update payment record
          PaymentStore.shared.markPaymentFailed(
              paymentId: paymentId.data.hexString,
              paymentHash: Data(paymentHash).hexString,
              reason: failureReason
          )
          
          // Notify UI with detailed error
          DispatchQueue.main.async {
              NotificationCenter.default.post(
                  name: .paymentFailed,
                  object: nil,
                  userInfo: [
                      "paymentHash": Data(paymentHash).hexString,
                      "reason": failureReason.description,
                      "isRetryable": failureReason.isRetryable
                  ]
              )
          }
          
          // Log failure for debugging
          logger.log(message: "Payment failed: \\(failureReason.description)")
      }
      
      // Helper methods
      private func extractPaymentPreimage(purpose: Bindings.PaymentPurpose) -> [UInt8]? {
          switch purpose.getValueType() {
          case .Bolt11InvoicePayment:
              if let bolt11 = purpose.getValueAsBolt11InvoicePayment() {
                  return bolt11.getPaymentPreimage()?.getValue()
              }
          case .Bolt12OfferPayment:
              if let bolt12 = purpose.getValueAsBolt12OfferPayment() {
                  return bolt12.getPaymentPreimage()?.getValue()
              }
          case .Bolt12RefundPayment:
              if let refund = purpose.getValueAsBolt12RefundPayment() {
                  return refund.getPaymentPreimage()?.getValue()
              }
          case .SpontaneousPayment:
              if let spontaneous = purpose.getValueAsSpontaneousPayment() {
                  return spontaneous.getSpontaneousPayment()
              }
          default:
              break
          }
          return nil
      }
      
      private func extractDescription(purpose: Bindings.PaymentPurpose) -> String {
          switch purpose.getValueType() {
          case .Bolt11InvoicePayment:
              return "Lightning Invoice"
          case .Bolt12OfferPayment:
              return "BOLT12 Offer"
          case .Bolt12RefundPayment:
              return "BOLT12 Refund"
          case .SpontaneousPayment:
              return "Spontaneous Payment"
          default:
              return "Unknown Payment"
          }
      }
      
      private func parsePaymentFailureReason(_ reason: Bindings.PaymentFailureReason?) -> PaymentFailure {
          guard let reason = reason else {
              return PaymentFailure(type: .unknown, description: "Unknown failure", isRetryable: true)
          }
          
          switch reason.getValueType() {
          case .RecipientRejected:
              return PaymentFailure(type: .recipientRejected, description: "Recipient rejected payment", isRetryable: false)
          case .UserAbandoned:
              return PaymentFailure(type: .userAbandoned, description: "Payment abandoned by user", isRetryable: false)
          case .RetriesExhausted:
              return PaymentFailure(type: .retriesExhausted, description: "All payment retries exhausted", isRetryable: false)
          case .PaymentExpired:
              return PaymentFailure(type: .expired, description: "Payment expired", isRetryable: false)
          case .RouteNotFound:
              return PaymentFailure(type: .noRoute, description: "No route found", isRetryable: true)
          case .UnexpectedError:
              return PaymentFailure(type: .unexpected, description: "Unexpected error", isRetryable: true)
          default:
              return PaymentFailure(type: .unknown, description: "Unknown failure", isRetryable: true)
          }
      }
  }
  
  struct PaymentFailure {
      enum FailureType {
          case recipientRejected
          case userAbandoned
          case retriesExhausted
          case expired
          case noRoute
          case unexpected
          case unknown
      }
      
      let type: FailureType
      let description: String
      let isRetryable: Bool
  }
  
  // Notification Names
  extension Notification.Name {
      static let paymentClaimable = Notification.Name("ldk.payment.claimable")
      static let paymentClaimed = Notification.Name("ldk.payment.claimed")
      static let paymentSent = Notification.Name("ldk.payment.sent")
      static let paymentFailed = Notification.Name("ldk.payment.failed")
  }`.trim(),
  
        channel_events: `
  // Channel Event Handling
  import LightningDevKit
  import BitcoinDevKit
  
  extension LDKEventHandler {
      // Funding Generation Ready - Need to create funding transaction
      func handleFundingGenerationReady(_ event: Bindings.Event.FundingGenerationReady) {
          Task {
              do {
                  let channelValue = event.getChannelValueSatoshis()
                  let outputScript = event.getOutputScript()
                  let userChannelId = event.getUserChannelId()
                  
                  // Build funding transaction with BDK
                  let address = try BitcoinDevKit.Address(
                      scriptPubkey: BitcoinDevKit.Script(rawOutputScript: outputScript)
                  )
                  
                  let txBuilder = try BitcoinDevKit.TxBuilder()
                      .addRecipient(script: address.scriptPubkey(), amount: channelValue)
                      .feeRate(satPerVbyte: Float(await getFeeRate()))
                      .enableRbf()
                  
                  let psbt = try txBuilder.finish(wallet: wallet)
                  let signResult = try wallet.sign(psbt: psbt, signOptions: nil)
                  
                  guard signResult.isFinalized else {
                      throw ChannelError.fundingNotFinalized
                  }
                  
                  let fundingTx = signResult.psbt.extractTx()
                  
                  // Provide funding transaction to LDK
                  let fundingResult = channelManager.fundingTransactionGenerated(
                      temporaryChannelId: event.getTemporaryChannelId(),
                      counterpartyNodeId: event.getCounterpartyNodeId(),
                      fundingTransaction: fundingTx.serialize()
                  )
                  
                  guard fundingResult.isOk() else {
                      throw ChannelError.fundingFailed(fundingResult.getError()?.getDescription() ?? "Unknown error")
                  }
                  
                  // Broadcast transaction
                  broadcaster.broadcastTransactions(txs: [fundingTx.serialize()])
                  
                  // Store channel info
                  ChannelStore.shared.storePendingChannel(
                      temporaryChannelId: event.getTemporaryChannelId(),
                      userChannelId: Data(userChannelId).hexString,
                      counterpartyNodeId: Data(event.getCounterpartyNodeId()).hexString,
                      fundingTxid: fundingTx.txid(),
                      channelValueSats: channelValue
                  )
                  
                  // Notify UI
                  DispatchQueue.main.async {
                      NotificationCenter.default.post(
                          name: .channelPendingFunding,
                          object: nil,
                          userInfo: [
                              "temporaryChannelId": event.getTemporaryChannelId().data.hexString,
                              "fundingTxid": fundingTx.txid()
                          ]
                      )
                  }
                  
              } catch {
                  logger.log(message: "Funding generation failed: \\(error)")
                  
                  // Notify failure
                  DispatchQueue.main.async {
                      NotificationCenter.default.post(
                          name: .channelFundingFailed,
                          object: nil,
                          userInfo: ["error": error.localizedDescription]
                      )
                  }
              }
          }
      }
      
      // Channel Ready - Channel is now usable
      func handleChannelReady(_ event: Bindings.Event.ChannelReady) {
          let channelId = event.getChannelId()
          let userChannelId = event.getUserChannelId()
          let counterpartyNodeId = event.getCounterpartyNodeId()
          let channelType = event.getChannelType()
          
          // Update channel status
          ChannelStore.shared.markChannelReady(
              channelId: channelId,
              userChannelId: Data(userChannelId).hexString,
              counterpartyNodeId: Data(counterpartyNodeId).hexString,
              channelType: channelType
          )
          
          // Update routing hints for invoices
          updateRoutingHints()
          
          // Notify UI
          DispatchQueue.main.async {
              NotificationCenter.default.post(
                  name: .channelReady,
                  object: nil,
                  userInfo: [
                      "channelId": channelId.data.hexString,
                      "counterpartyNodeId": Data(counterpartyNodeId).hexString
                  ]
              )
          }
          
          // Show notification
          showChannelNotification(
              title: "Channel Ready",
              body: "Channel is now active and ready for payments",
              identifier: channelId.data.hexString
          )
          
          logger.log(message: "Channel ready: \\(channelId.data.hexString)")
      }
      
      // Channel Closed - Channel has been closed
      func handleChannelClosed(_ event: Bindings.Event.ChannelClosed) {
          let channelId = event.getChannelId()
          let userChannelId = event.getUserChannelId()
          let reason = event.getReason()
          let counterpartyNodeId = event.getCounterpartyNodeId()
          let channelCapacityMsat = event.getChannelCapacitySats()?.getValue()
          let channelFundingTxo = event.getChannelFundingTxo()
          
          // Parse closure reason
          let closureReason = parseClosureReason(reason)
          
          // Update channel status
          ChannelStore.shared.markChannelClosed(
              channelId: channelId,
              userChannelId: Data(userChannelId).hexString,
              reason: closureReason,
              capacityMsat: channelCapacityMsat
          )
          
          // Handle based on closure type
          switch closureReason.type {
          case .cooperativeClosure:
              logger.log(message: "Channel closed cooperatively")
          case .commitmentTxConfirmed:
              logger.log(message: "Channel force closed - commitment tx confirmed")
              // Monitor for penalty transactions if needed
          case .counterpartyForceClosed:
              logger.log(message: "Counterparty force closed channel")
              // Ensure we claim our outputs
          case .holderForceClosed:
              logger.log(message: "We force closed the channel")
          default:
              logger.log(message: "Channel closed: \\(closureReason.description)")
          }
          
          // Update routing hints
          updateRoutingHints()
          
          // Notify UI
          DispatchQueue.main.async {
              NotificationCenter.default.post(
                  name: .channelClosed,
                  object: nil,
                  userInfo: [
                      "channelId": channelId.data.hexString,
                      "reason": closureReason.description,
                      "isForceClose": closureReason.isForceClose
                  ]
              )
          }
      }
      
      // Open Channel Request - Counterparty wants to open channel
      func handleOpenChannelRequest(_ event: Bindings.Event.OpenChannelRequest) {
          let temporaryChannelId = event.getTemporaryChannelId()
          let counterpartyNodeId = event.getCounterpartyNodeId()
          let fundingSatoshis = event.getFundingSatoshis()
          let pushMsat = event.getPushMsat()
          let channelType = event.getChannelType()
          
          // Check if we want to accept this channel
          let shouldAccept = evaluateChannelRequest(
              counterpartyNodeId: Data(counterpartyNodeId).hexString,
              fundingSatoshis: fundingSatoshis,
              pushMsat: pushMsat,
              channelType: channelType
          )
          
          if shouldAccept {
              // Accept the channel
              let userChannelId = generateUserChannelId()
              let acceptResult = channelManager.acceptInboundChannel(
                  temporaryChannelId: temporaryChannelId,
                  counterpartyNodeId: counterpartyNodeId,
                  userChannelId: userChannelId
              )
              
              if acceptResult.isOk() {
                  logger.log(message: "Accepted inbound channel from \\(Data(counterpartyNodeId).hexString)")
                  
                  // Store pending channel
                  ChannelStore.shared.storeInboundPendingChannel(
                      temporaryChannelId: temporaryChannelId,
                      userChannelId: Data(userChannelId).hexString,
                      counterpartyNodeId: Data(counterpartyNodeId).hexString,
                      fundingSatoshis: fundingSatoshis,
                      pushMsat: pushMsat
                  )
              } else {
                  logger.log(message: "Failed to accept channel: \\(acceptResult.getError()?.getDescription() ?? "Unknown")")
              }
          } else {
              // Reject the channel
              let rejectResult = channelManager.forceCloseWithoutBroadcastingTxn(
                  channelId: temporaryChannelId,
                  counterpartyNodeId: counterpartyNodeId
              )
              
              logger.log(message: "Rejected inbound channel from \\(Data(counterpartyNodeId).hexString)")
          }
      }
      
      // Helper methods
      private func parseClosureReason(_ reason: Bindings.ClosureReason) -> ChannelClosureInfo {
          switch reason.getValueType() {
          case .CounterpartyForceClosed:
              let details = reason.getValueAsCounterpartyForceClosed()!
              return ChannelClosureInfo(
                  type: .counterpartyForceClosed,
                  description: "Counterparty force closed: \\(details.getPeerMessage())",
                  isForceClose: true
              )
          case .HolderForceClosed:
              return ChannelClosureInfo(
                  type: .holderForceClosed,
                  description: "We force closed the channel",
                  isForceClose: true
              )
          case .CooperativeClosure:
              return ChannelClosureInfo(
                  type: .cooperativeClosure,
                  description: "Channel closed cooperatively",
                  isForceClose: false
              )
          case .CommitmentTxConfirmed:
              return ChannelClosureInfo(
                  type: .commitmentTxConfirmed,
                  description: "Commitment transaction confirmed on-chain",
                  isForceClose: true
              )
          case .FundingTimedOut:
              return ChannelClosureInfo(
                  type: .fundingTimeout,
                  description: "Channel funding timed out",
                  isForceClose: false
              )
          case .ProcessingError:
              let error = reason.getValueAsProcessingError()!
              return ChannelClosureInfo(
                  type: .processingError,
                  description: "Processing error: \\(error.getErr())",
                  isForceClose: false
              )
          case .DisconnectedPeer:
              return ChannelClosureInfo(
                  type: .disconnectedPeer,
                  description: "Peer disconnected",
                  isForceClose: false
              )
          case .OutdatedChannelManager:
              return ChannelClosureInfo(
                  type: .outdatedChannelManager,
                  description: "Channel manager outdated",
                  isForceClose: false
              )
          case .CounterpartyCoopClosedUnfundedChannel:
              return ChannelClosureInfo(
                  type: .coopClosedUnfunded,
                  description: "Counterparty cooperatively closed unfunded channel",
                  isForceClose: false
              )
          case .FundingBatchClosure:
              return ChannelClosureInfo(
                  type: .fundingBatchClosure,
                  description: "Closed due to funding batch failure",
                  isForceClose: false
              )
          case .HTLCsTimedOut:
              return ChannelClosureInfo(
                  type: .htlcsTimedOut,
                  description: "Channel closed due to HTLC timeout",
                  isForceClose: false
              )
          default:
              return ChannelClosureInfo(
                  type: .unknown,
                  description: "Unknown closure reason",
                  isForceClose: false
              )
          }
      }
      
      private func evaluateChannelRequest(
          counterpartyNodeId: String,
          fundingSatoshis: UInt64,
          pushMsat: UInt64,
          channelType: Bindings.ChannelTypeFeatures
      ) -> Bool {
          // Check minimum channel size
          guard fundingSatoshis >= 20000 else { return false }
          
          // Check if we know this peer
          guard PeerStore.shared.isTrustedPeer(nodeId: counterpartyNodeId) else { return false }
          
          // Check channel type compatibility
          if channelType.requiresAnchorsZeroFeeHtlcTx() && !supportsAnchors() {
              return false
          }
          
          // Check total channel count
          let currentChannels = channelManager.listChannels().count
          guard currentChannels < maxChannelCount() else { return false }
          
          return true
      }
      
      private func generateUserChannelId() -> [UInt8] {
          var userChannelId = [UInt8](repeating: 0, count: 16)
          arc4random_buf(&userChannelId, 16)
          return userChannelId
      }
      
      private func updateRoutingHints() {
          // Update routing hints for invoice generation
          RoutingHintManager.shared.updateFromChannels(channelManager.listUsableChannels())
      }
  }
  
  struct ChannelClosureInfo {
      enum ClosureType {
          case counterpartyForceClosed
          case holderForceClosed
          case cooperativeClosure
          case commitmentTxConfirmed
          case fundingTimeout
          case processingError
          case disconnectedPeer
          case outdatedChannelManager
          case coopClosedUnfunded
          case fundingBatchClosure
          case htlcsTimedOut
          case unknown
      }
      
      let type: ClosureType
      let description: String
      let isForceClose: Bool
  }
  
  // Channel notification names
  extension Notification.Name {
      static let channelPendingFunding = Notification.Name("ldk.channel.pendingFunding")
      static let channelFundingFailed = Notification.Name("ldk.channel.fundingFailed")
      static let channelReady = Notification.Name("ldk.channel.ready")
      static let channelClosed = Notification.Name("ldk.channel.closed")
  }`.trim(),
  
        funding_events: `
  // Funding and Transaction Events
  import LightningDevKit
  import BitcoinDevKit
  
  extension LDKEventHandler {
      // Discard Funding - Funding transaction can be discarded
      func handleDiscardFunding(_ event: Bindings.Event.DiscardFunding) {
          let channelId = event.getChannelId()
          let fundingTx = event.getTransaction()
          
          logger.log(message: "Discarding funding transaction for channel: \\(channelId.data.hexString)")
          
          // Remove from our transaction store
          TransactionStore.shared.removePendingTransaction(
              txid: BitcoinDevKit.Transaction(transactionBytes: fundingTx).txid()
          )
          
          // Update channel status
          ChannelStore.shared.removeChannel(channelId: channelId)
          
          // Notify UI
          DispatchQueue.main.async {
              NotificationCenter.default.post(
                  name: .fundingDiscarded,
                  object: nil,
                  userInfo: ["channelId": channelId.data.hexString]
              )
          }
      }
      
      // Bump Transaction - Need to bump fee for transaction
      func handleBumpTransaction(_ event: Bindings.Event.BumpTransaction) {
          switch event.getValueType() {
          case .ChannelClose:
              handleBumpChannelClose(event.getValueAsChannelClose()!)
          case .HTLCResolution:
              handleBumpHTLCResolution(event.getValueAsHTLCResolution()!)
          default:
              logger.log(message: "Unknown bump transaction type")
          }
      }
      
      private func handleBumpChannelClose(_ bumpEvent: Bindings.Event.BumpTransaction.ChannelClose) {
          let channelId = bumpEvent.getChannelId()
          let counterpartyNodeId = bumpEvent.getCounterpartyNodeId()
          let claimId = bumpEvent.getClaimId()
          let packageTargetFeerateSatPer1000Weight = bumpEvent.getPackageTargetFeerateSatPer1000Weight()
          let commitmentTx = bumpEvent.getCommitmentTx()
          let commitmentTxFeeSatoshis = bumpEvent.getCommitmentTxFeeSatoshis()
          let anchorDescriptor = bumpEvent.getAnchorDescriptor()
          let pendingHtlcs = bumpEvent.getPendingHtlcs()
          
          Task {
              do {
                  // Build anchor spending transaction
                  let anchorTx = try await buildAnchorSpendingTransaction(
                      anchorDescriptor: anchorDescriptor,
                      targetFeeRate: packageTargetFeerateSatPer1000Weight,
                      commitmentTx: commitmentTx,
                      commitmentTxFee: commitmentTxFeeSatoshis
                  )
                  
                  // Broadcast the transaction
                  broadcaster.broadcastTransactions(txs: [anchorTx])
                  
                  // Handle any pending HTLCs
                  for htlc in pendingHtlcs {
                      handlePendingHTLC(htlc)
                  }
                  
                  logger.log(message: "Bumped channel close fee for channel: \\(channelId.data.hexString)")
                  
              } catch {
                  logger.log(message: "Failed to bump channel close fee: \\(error)")
              }
          }
      }
      
      private func handleBumpHTLCResolution(_ bumpEvent: Bindings.Event.BumpTransaction.HTLCResolution) {
          let channelId = bumpEvent.getChannelId()
          let counterpartyNodeId = bumpEvent.getCounterpartyNodeId()
          let claimId = bumpEvent.getClaimId()
          let targetFeerateSatPer1000Weight = bumpEvent.getTargetFeerateSatPer1000Weight()
          let htlcDescriptors = bumpEvent.getHtlcDescriptors()
          let txLockTime = bumpEvent.getTxLockTime()
          
          Task {
              do {
                  // Build HTLC claim transaction
                  let htlcTx = try await buildHTLCTransaction(
                      htlcDescriptors: htlcDescriptors,
                      targetFeeRate: targetFeerateSatPer1000Weight,
                      lockTime: txLockTime
                  )
                  
                  // Broadcast the transaction
                  broadcaster.broadcastTransactions(txs: [htlcTx])
                  
                  logger.log(message: "Bumped HTLC resolution fee for channel: \\(channelId.data.hexString)")
                  
              } catch {
                  logger.log(message: "Failed to bump HTLC resolution fee: \\(error)")
              }
          }
      }
      
      // Build anchor spending transaction
      private func buildAnchorSpendingTransaction(
          anchorDescriptor: Bindings.AnchorDescriptor,
          targetFeeRate: UInt32,
          commitmentTx: [UInt8],
          commitmentTxFee: UInt64
      ) async throws -> [UInt8] {
          // Get anchor output
          let anchorOutpoint = anchorDescriptor.getOutpoint()
          let anchorOutput = anchorDescriptor.getPreviousUtxo()
          
          // Calculate required fee
          let anchorSpendWeight: UInt64 = 321 // Approximate weight for anchor spend
          let requiredFee = (anchorSpendWeight * UInt64(targetFeeRate)) / 1000
          
          // Build transaction with BDK
          let txBuilder = BitcoinDevKit.TxBuilder()
          
          // Add anchor input
          txBuilder.addUtxo(outpoint: anchorOutpoint, satisfaction: nil)
          
          // Add wallet inputs if needed for fees
          if requiredFee > anchorOutput.getValue() {
              let additionalFee = requiredFee - anchorOutput.getValue()
              txBuilder.fundTransaction(wallet: wallet, requiredAmount: additionalFee)
          }
          
          // Set fee rate
          txBuilder.feeRate(satPerVbyte: Float(targetFeeRate / 250)) // Convert to sat/vbyte
          
          // Set change address
          let changeAddress = try wallet.getAddress(addressIndex: .new)
          txBuilder.drainTo(address: changeAddress.address.asString())
          
          // Finish and sign
          let psbt = try txBuilder.finish(wallet: wallet)
          let signed = try wallet.sign(psbt: psbt, signOptions: nil)
          
          return signed.psbt.extractTx().serialize()
      }
      
      // Build HTLC transaction
      private func buildHTLCTransaction(
          htlcDescriptors: [Bindings.HTLCDescriptor],
          targetFeeRate: UInt32,
          lockTime: UInt32
      ) async throws -> [UInt8] {
          var inputs: [Bindings.TxIn] = []
          var outputs: [Bindings.TxOut] = []
          var totalValue: UInt64 = 0
          
          // Add HTLC inputs
          for descriptor in htlcDescriptors {
              let input = Bindings.TxIn(
                  previousOutput: descriptor.getOutpoint(),
                  scriptSig: Bindings.CVecU8Z(),
                  sequence: descriptor.getPerCommitmentNumber(),
                  witness: Bindings.Witness(elements: [])
              )
              inputs.append(input)
              
              totalValue += descriptor.getHtlc().getAmountMsat() / 1000
          }
          
          // Calculate fee
          let txWeight = estimateHTLCTxWeight(htlcCount: htlcDescriptors.count)
          let fee = (txWeight * UInt64(targetFeeRate)) / 1000
          
          // Create output to our wallet
          let outputValue = totalValue.saturatingSubtraction(fee)
          if outputValue > 546 { // Dust limit
              let address = try wallet.getAddress(addressIndex: .new)
              let script = try address.address.scriptPubkey()
              
              let output = Bindings.TxOut(
                  value: outputValue,
                  scriptPubkey: script.toBytes()
              )
              outputs.append(output)
          }
          
          // Build transaction
          let htlcTx = Bindings.Transaction(
              version: 2,
              lockTime: lockTime,
              input: inputs,
              output: outputs
          )
          
          // Sign inputs
          for (index, descriptor) in htlcDescriptors.enumerated() {
              let signature = keysManager.asSignerProvider().signCounterpartyHtlcTransaction(
                  htlcTx: htlcTx.write(),
                  inputIdx: UInt(index),
                  amount: descriptor.getHtlc().getAmountMsat() / 1000,
                  perCommitmentPoint: descriptor.getPerCommitmentPoint(),
                  htlc: descriptor.getHtlc()
              )
              
              // Add witness
              htlcTx.input[index].witness = createHTLCWitness(
                  signature: signature,
                  htlcDescriptor: descriptor
              )
          }
          
          return htlcTx.write()
      }
      
      private func estimateHTLCTxWeight(htlcCount: Int) -> UInt64 {
          // Base transaction weight + per-HTLC input weight
          let baseTxWeight: UInt64 = 42 * 4 // Version, locktime, counts
          let perInputWeight: UInt64 = 413 // Approximate HTLC input weight
          let outputWeight: UInt64 = 31 * 4 // P2WPKH output
          
          return baseTxWeight + (UInt64(htlcCount) * perInputWeight) + outputWeight
      }
  }
  
  // Transaction notification names
  extension Notification.Name {
      static let fundingDiscarded = Notification.Name("ldk.funding.discarded")
      static let transactionBumped = Notification.Name("ldk.transaction.bumped")
  }`.trim(),
  
        spendable_outputs: `
  // Spendable Outputs Event Handling
  import LightningDevKit
  import BitcoinDevKit
  
  extension LDKEventHandler {
      // Handle spendable outputs that can be swept
      func handleSpendableOutputs(_ event: Bindings.Event.SpendableOutputs) {
          let outputs = event.getOutputs()
          let channelId = event.getChannelId()
          
          Task {
              do {
                  // Group outputs by type for efficient handling
                  let groupedOutputs = groupOutputsByType(outputs)
                  
                  // Process each group
                  for (outputType, descriptors) in groupedOutputs {
                      try await sweepOutputs(
                          descriptors: descriptors,
                          outputType: outputType,
                          channelId: channelId
                      )
                  }
                  
                  logger.log(message: "Successfully swept \\(outputs.count) spendable outputs")
                  
              } catch {
                  logger.log(message: "Failed to sweep outputs: \\(error)")
                  
                  // Store for retry
                  SpendableOutputStore.shared.storePendingOutputs(
                      outputs: outputs,
                      channelId: channelId
                  )
              }
          }
      }
      
      // Sweep outputs to wallet
      private func sweepOutputs(
          descriptors: [Bindings.SpendableOutputDescriptor],
          outputType: OutputType,
          channelId: Bindings.ChannelId?
      ) async throws {
          // Get fee rate based on output type
          let feeRate = await getFeeRateForOutputType(outputType)
          
          // Get destination address
          let destinationAddress = try wallet.getAddress(addressIndex: .new)
          let destinationScript = try destinationAddress.address.scriptPubkey().toBytes()
          
          // Build spending transaction
          let spendResult = keysManager.spendSpendableOutputs(
              descriptors: descriptors,
              outputs: [], // No additional outputs
              changeDestinationScript: destinationScript,
              feerateSatPer1000Weight: feeRate,
              locktime: nil
          )
          
          guard spendResult.isOk(), let transaction = spendResult.getValue() else {
              throw OutputSweepError.failedToBuildTransaction(
                  spendResult.getError()?.getDescription() ?? "Unknown error"
              )
          }
          
          // Broadcast transaction
          broadcaster.broadcastTransactions(txs: [transaction])
          
          // Store sweep transaction
          let txid = BitcoinDevKit.Transaction(transactionBytes: transaction).txid()
          SweepTransactionStore.shared.store(
              txid: txid,
              outputs: descriptors,
              channelId: channelId,
              outputType: outputType,
              timestamp: Date()
          )
          
          // Update balance after sweep
          DispatchQueue.main.asyncAfter(deadline: .now() + 2) {
              BalanceManager.shared.updateBalance()
          }
          
          // Notify UI
          DispatchQueue.main.async {
              NotificationCenter.default.post(
                  name: .outputsSwept,
                  object: nil,
                  userInfo: [
                      "txid": txid,
                      "outputCount": descriptors.count,
                      "outputType": outputType.rawValue
                  ]
              )
          }
      }
      
      // Group outputs by type for batching
      private func groupOutputsByType(_ outputs: [Bindings.SpendableOutputDescriptor]) -> [OutputType: [Bindings.SpendableOutputDescriptor]] {
          var grouped: [OutputType: [Bindings.SpendableOutputDescriptor]] = [:]
          
          for output in outputs {
              let outputType = getOutputType(output)
              if grouped[outputType] == nil {
                  grouped[outputType] = []
              }
              grouped[outputType]?.append(output)
          }
          
          return grouped
      }
      
      // Determine output type
      private func getOutputType(_ output: Bindings.SpendableOutputDescriptor) -> OutputType {
          switch output.getValueType() {
          case .StaticPaymentOutput:
              return .staticPayment
          case .DelayedPaymentOutput:
              return .delayedPayment
          case .StaticOutput:
              return .staticOutput
          default:
              return .unknown
          }
      }
      
      // Get appropriate fee rate for output type
      private func getFeeRateForOutputType(_ outputType: OutputType) async -> UInt32 {
          let feeEstimator = LDKManager.shared.feeEstimator
          
          switch outputType {
          case .staticPayment:
              // Higher priority for static payment outputs
              return feeEstimator.getEstSatPer1000Weight(
                  confirmationTarget: .onChainSweep
              )
          case .delayedPayment:
              // Medium priority for delayed payments
              return feeEstimator.getEstSatPer1000Weight(
                  confirmationTarget: .nonAnchorChannelFee
              )
          case .staticOutput:
              // Lower priority for static outputs
              return feeEstimator.getEstSatPer1000Weight(
                  confirmationTarget: .channelCloseMinimum
              )
          case .unknown:
              // Default fee rate
              return feeEstimator.getEstSatPer1000Weight(
                  confirmationTarget: .outputSpendingFee
              )
          }
      }
  }
  
  // Output type enumeration
  enum OutputType: String {
      case staticPayment = "static_payment"
      case delayedPayment = "delayed_payment"
      case staticOutput = "static_output"
      case unknown = "unknown"
  }
  
  // Output sweep error
  enum OutputSweepError: LocalizedError {
      case failedToBuildTransaction(String)
      case broadcastFailed(String)
      case insufficientFunds
      
      var errorDescription: String? {
          switch self {
          case .failedToBuildTransaction(let reason):
              return "Failed to build sweep transaction: \\(reason)"
          case .broadcastFailed(let reason):
              return "Failed to broadcast sweep transaction: \\(reason)"
          case .insufficientFunds:
              return "Insufficient funds to sweep outputs"
          }
      }
  }
  
  // Spendable Output Store for persistence
  class SpendableOutputStore {
      static let shared = SpendableOutputStore()
      
      private let queue = DispatchQueue(label: "spendable.output.store", attributes: .concurrent)
      private var pendingOutputs: [PendingOutput] = []
      
      struct PendingOutput: Codable {
          let id: String
          let outputData: Data
          let channelId: String?
          let addedAt: Date
          var retryCount: Int
      }
      
      func storePendingOutputs(outputs: [Bindings.SpendableOutputDescriptor], channelId: Bindings.ChannelId?) {
          queue.async(flags: .barrier) {
              for output in outputs {
                  let pending = PendingOutput(
                      id: UUID().uuidString,
                      outputData: Data(output.write()),
                      channelId: channelId?.data.hexString,
                      addedAt: Date(),
                      retryCount: 0
                  )
                  self.pendingOutputs.append(pending)
              }
              self.persist()
          }
      }
      
      func getPendingOutputs() -> [PendingOutput] {
          queue.sync { pendingOutputs }
      }
      
      func removePendingOutput(id: String) {
          queue.async(flags: .barrier) {
              self.pendingOutputs.removeAll { $0.id == id }
              self.persist()
          }
      }
      
      private func persist() {
          // Persist to UserDefaults or file
          if let encoded = try? JSONEncoder().encode(pendingOutputs) {
              UserDefaults.standard.set(encoded, forKey: "pending_spendable_outputs")
          }
      }
  }
  
  // Retry sweeping pending outputs
  extension LDKEventHandler {
      func retryPendingOutputSweeps() {
          let pendingOutputs = SpendableOutputStore.shared.getPendingOutputs()
          
          for pending in pendingOutputs where pending.retryCount < 3 {
              // Deserialize output
              if let outputResult = Bindings.SpendableOutputDescriptor.read(
                  ser: [UInt8](pending.outputData),
                  arg: keysManager
              ), outputResult.isOk(), let output = outputResult.getValue() {
                  
                  Task {
                      do {
                          try await sweepOutputs(
                              descriptors: [output],
                              outputType: getOutputType(output),
                              channelId: nil
                          )
                          
                          // Remove from pending if successful
                          SpendableOutputStore.shared.removePendingOutput(id: pending.id)
                          
                      } catch {
                          logger.log(message: "Retry sweep failed: \\(error)")
                          // Increment retry count
                          pending.retryCount += 1
                      }
                  }
              }
          }
      }
  }
  
  // Notification name for swept outputs
  extension Notification.Name {
      static let outputsSwept = Notification.Name("ldk.outputs.swept")
  }`.trim(),
  
        forwarding_events: `
  // Payment Forwarding Event Handling
  import LightningDevKit
  
  extension LDKEventHandler {
      // Payment Forwarded - Successfully forwarded a payment
      func handlePaymentForwarded(_ event: Bindings.Event.PaymentForwarded) {
          let prevChannelId = event.getPrevChannelId()
          let nextChannelId = event.getNextChannelId()
          let prevUserChannelId = event.getPrevUserChannelId()
          let nextUserChannelId = event.getNextUserChannelId()
          let totalFeeMsat = event.getTotalFeeMsat()
          let skimmedFeeMsat = event.getSkimmedFeeMsat()
          let claimFromOnchain = event.getClaimFromOnchainTx()
          let outboundAmountMsat = event.getOutboundAmountForwardedMsat()
          
          // Calculate forwarding fee earned
          let feeEarnedMsat = totalFeeMsat?.getValue() ?? 0
          
          // Store forwarding record
          ForwardingStore.shared.recordForwarding(
              prevChannelId: prevChannelId?.data.hexString,
              nextChannelId: nextChannelId?.data.hexString,
              feeEarnedMsat: feeEarnedMsat,
              amountMsat: outboundAmountMsat?.getValue() ?? 0,
              timestamp: Date()
          )
          
          // Update routing statistics
          RoutingStats.shared.recordSuccessfulForward(
              fromChannel: prevChannelId,
              toChannel: nextChannelId,
              feeMsat: feeEarnedMsat
          )
          
          // Notify UI
          DispatchQueue.main.async {
              NotificationCenter.default.post(
                  name: .paymentForwarded,
                  object: nil,
                  userInfo: [
                      "feeEarnedMsat": feeEarnedMsat,
                      "prevChannelId": prevChannelId?.data.hexString ?? "unknown",
                      "nextChannelId": nextChannelId?.data.hexString ?? "unknown"
                  ]
              )
          }
          
          logger.log(message: "Payment forwarded. Fee earned: \\(feeEarnedMsat) msat")
      }
      
      // Pending HTLCs Forwardable - Need to process pending forwards
      func handlePendingHTLCsForwardable(_ event: Bindings.Event.PendingHTLCsForwardable) {
          let timeForwardable = event.getTimeForwardableNanos()
          
          // Calculate delay in milliseconds
          let delayMs = timeForwardable / 1_000_000
          
          if delayMs > 0 {
              // Schedule forward processing
              DispatchQueue.global().asyncAfter(deadline: .now() + .milliseconds(Int(delayMs))) {
                  self.channelManager.processPendingHtlcForwards()
                  self.logger.log(message: "Processed pending HTLC forwards after \\(delayMs)ms delay")
              }
          } else {
              // Process immediately
              channelManager.processPendingHtlcForwards()
              logger.log(message: "Processed pending HTLC forwards immediately")
          }
      }
      
      // HTLC Intercepted - Intercept HTLC for custom handling
      func handleHTLCIntercepted(_ event: Bindings.Event.HTLCIntercepted) {
          let interceptId = event.getInterceptId()
          let requestedNextHopScid = event.getRequestedNextHopScid()
          let paymentHash = event.getPaymentHash()
          let inboundAmount = event.getInboundAmountMsat()
          let outboundAmount = event.getExpectedOutboundAmountMsat()
          
          // Evaluate HTLC for acceptance
          let evaluation = evaluateHTLC(
              paymentHash: paymentHash,
              inboundAmount: inboundAmount,
              outboundAmount: outboundAmount,
              nextHopScid: requestedNextHopScid
          )
          
          switch evaluation {
          case .accept:
              // Forward the HTLC normally
              let result = channelManager.forwardInterceptedHtlc(
                  interceptId: interceptId,
                  nextHopChannelId: getChannelId(fromScid: requestedNextHopScid),
                  nextHopNodeId: getNodeId(fromScid: requestedNextHopScid),
                  amtToForwardMsat: outboundAmount
              )
              
              if result.isOk() {
                  logger.log(message: "Forwarded intercepted HTLC")
              } else {
                  logger.log(message: "Failed to forward intercepted HTLC")
              }
              
          case .reject(let reason):
              // Fail the HTLC
              channelManager.failInterceptedHtlc(interceptId: interceptId)
              logger.log(message: "Rejected intercepted HTLC: \\(reason)")
              
          case .customHandle(let customData):
              // Handle with custom logic (e.g., hold invoice)
              handleCustomHTLC(
                  interceptId: interceptId,
                  paymentHash: paymentHash,
                  customData: customData
              )
          }
      }
      
      // HTLC Handling Failed
      func handleHTLCHandlingFailed(_ event: Bindings.Event.HTLCHandlingFailed) {
          let prevChannelId = event.getPrevChannelId()
          let failedNextDestination = event.getFailedNextDestination()
          
          // Update routing statistics
          RoutingStats.shared.recordFailedForward(
              fromChannel: prevChannelId,
              toDestination: failedNextDestination
          )
          
          logger.log(message: "HTLC handling failed from channel: \\(prevChannelId.data.hexString)")
      }
  }
  
  // HTLC evaluation logic
  extension LDKEventHandler {
      enum HTLCEvaluation {
          case accept
          case reject(String)
          case customHandle(Data)
      }
      
      private func evaluateHTLC(
          paymentHash: [UInt8],
          inboundAmount: UInt64,
          outboundAmount: UInt64,
          nextHopScid: UInt64
      ) -> HTLCEvaluation {
          // Check if this is a hold invoice
          if let holdInvoice = HoldInvoiceStore.shared.getHoldInvoice(
              paymentHash: Data(paymentHash).hexString
          ) {
              return .customHandle(holdInvoice.metadata)
          }
          
          // Check channel capacity
          if let channel = getChannel(fromScid: nextHopScid) {
              if channel.getOutboundCapacityMsat() < outboundAmount {
                  return .reject("Insufficient outbound capacity")
              }
          }
          
          // Check fee policy
          let impliedFee = inboundAmount.saturatingSubtraction(outboundAmount)
          if impliedFee < minimumForwardingFee() {
              return .reject("Fee too low")
          }
          
          // Check rate limiting
          if !RateLimiter.shared.allowForward(
              amount: outboundAmount,
              channelScid: nextHopScid
          ) {
              return .reject("Rate limit exceeded")
          }
          
          return .accept
      }
      
      private func handleCustomHTLC(
          interceptId: Bindings.InterceptId,
          paymentHash: [UInt8],
          customData: Data
      ) {
          // Example: Hold invoice handling
          Task {
              // Wait for external approval
              let approved = await waitForApproval(
                  paymentHash: Data(paymentHash).hexString,
                  timeout: 30
              )
              
              if approved {
                  // Forward the HTLC
                  let result = channelManager.forwardInterceptedHtlc(
                      interceptId: interceptId,
                      nextHopChannelId: nil, // Use default
                      nextHopNodeId: nil, // Use default
                      amtToForwardMsat: 0 // Use default
                  )
                  
                  if result.isOk() {
                      logger.log(message: "Hold invoice approved and forwarded")
                  }
              } else {
                  // Fail the HTLC
                  channelManager.failInterceptedHtlc(interceptId: interceptId)
                  logger.log(message: "Hold invoice rejected")
              }
          }
      }
  }
  
  // Forwarding Statistics
  class RoutingStats {
      static let shared = RoutingStats()
      
      private var successfulForwards: [ForwardRecord] = []
      private var failedForwards: [FailedForwardRecord] = []
      private let queue = DispatchQueue(label: "routing.stats", attributes: .concurrent)
      
      struct ForwardRecord {
          let fromChannel: Bindings.ChannelId?
          let toChannel: Bindings.ChannelId?
          let feeMsat: UInt64
          let timestamp: Date
      }
      
      struct FailedForwardRecord {
          let fromChannel: Bindings.ChannelId
          let toDestination: Bindings.HTLCDestination
          let timestamp: Date
      }
      
      func recordSuccessfulForward(
          fromChannel: Bindings.ChannelId?,
          toChannel: Bindings.ChannelId?,
          feeMsat: UInt64
      ) {
          queue.async(flags: .barrier) {
              let record = ForwardRecord(
                  fromChannel: fromChannel,
                  toChannel: toChannel,
                  feeMsat: feeMsat,
                  timestamp: Date()
              )
              self.successfulForwards.append(record)
              
              // Keep only last 1000 records
              if self.successfulForwards.count > 1000 {
                  self.successfulForwards.removeFirst()
              }
          }
      }
      
      func recordFailedForward(
          fromChannel: Bindings.ChannelId,
          toDestination: Bindings.HTLCDestination
      ) {
          queue.async(flags: .barrier) {
              let record = FailedForwardRecord(
                  fromChannel: fromChannel,
                  toDestination: toDestination,
                  timestamp: Date()
              )
              self.failedForwards.append(record)
              
              // Keep only last 1000 records
              if self.failedForwards.count > 1000 {
                  self.failedForwards.removeFirst()
              }
          }
      }
      
      func getStatistics(since: Date) -> (
          totalForwards: Int,
          successfulForwards: Int,
          failedForwards: Int,
          totalFeesEarned: UInt64,
          averageFee: UInt64
      ) {
          queue.sync {
              let recentSuccessful = successfulForwards.filter { $0.timestamp >= since }
              let recentFailed = failedForwards.filter { $0.timestamp >= since }
              
              let totalFees = recentSuccessful.reduce(0) { $0 + $1.feeMsat }
              let avgFee = recentSuccessful.isEmpty ? 0 : totalFees / UInt64(recentSuccessful.count)
              
              return (
                  totalForwards: recentSuccessful.count + recentFailed.count,
                  successfulForwards: recentSuccessful.count,
                  failedForwards: recentFailed.count,
                  totalFeesEarned: totalFees,
                  averageFee: avgFee
              )
          }
      }
  }
  
  // Forwarding notification names
  extension Notification.Name {
      static let paymentForwarded = Notification.Name("ldk.payment.forwarded")
      static let htlcIntercepted = Notification.Name("ldk.htlc.intercepted")
  }`.trim(),
  
        event_persistence: `
  // Event Persistence and Recovery
  import LightningDevKit
  import Foundation
  
  class EventPersistence {
      static let shared = EventPersistence()
      
      private let queue = DispatchQueue(label: "event.persistence", attributes: .concurrent)
      private let documentsDirectory: URL
      private let eventsDirectory: URL
      private let maxStoredEvents = 1000
      
      init() {
          documentsDirectory = FileManager.default.urls(
              for: .documentDirectory,
              in: .userDomainMask
          ).first!
          
          eventsDirectory = documentsDirectory.appendingPathComponent("ldk_events")
          
          // Create directory if needed
          try? FileManager.default.createDirectory(
              at: eventsDirectory,
              withIntermediateDirectories: true
          )
      }
      
      // Store event for potential replay
      func store(event: Bindings.Event) {
          queue.async(flags: .barrier) {
              let eventId = UUID().uuidString
              let timestamp = Date()
              
              // Serialize event
              let eventData = event.write()
              
              // Create event record
              let record = StoredEvent(
                  id: eventId,
                  timestamp: timestamp,
                  eventType: event.getValueType().rawValue,
                  eventData: Data(eventData),
                  processed: false
              )
              
              // Save to disk
              self.saveEvent(record)
              
              // Clean up old events
              self.pruneOldEvents()
          }
      }
      
      // Mark event as processed
      func markProcessed(eventId: String) {
          queue.async(flags: .barrier) {
              let eventPath = self.eventsDirectory.appendingPathComponent("\\(eventId).json")
              
              if var record = self.loadEvent(from: eventPath) {
                  record.processed = true
                  self.saveEvent(record)
              }
          }
      }
      
      // Load unprocessed events for recovery
      func loadUnprocessedEvents() -> [StoredEvent] {
          queue.sync {
              var unprocessedEvents: [StoredEvent] = []
              
              do {
                  let files = try FileManager.default.contentsOfDirectory(
                      at: eventsDirectory,
                      includingPropertiesForKeys: [.creationDateKey]
                  )
                  
                  for file in files where file.pathExtension == "json" {
                      if let event = loadEvent(from: file), !event.processed {
                          unprocessedEvents.append(event)
                      }
                  }
                  
                  // Sort by timestamp
                  unprocessedEvents.sort { $0.timestamp < $1.timestamp }
                  
              } catch {
                  logger.log(message: "Failed to load events: \\(error)")
              }
              
              return unprocessedEvents
          }
      }
      
      // Replay unprocessed events during recovery
      func replayUnprocessedEvents(handler: LDKEventHandler) async {
          let unprocessedEvents = loadUnprocessedEvents()
          
          logger.log(message: "Found \\(unprocessedEvents.count) unprocessed events to replay")
          
          for storedEvent in unprocessedEvents {
              // Deserialize event
              if let event = deserializeEvent(storedEvent.eventData) {
                  // Check if event is still valid
                  if isEventStillValid(event, storedAt: storedEvent.timestamp) {
                      // Replay event
                      handler.handleEvent(event: event)
                      
                      // Mark as processed
                      markProcessed(eventId: storedEvent.id)
                      
                      logger.log(message: "Replayed event: \\(storedEvent.eventType)")
                  } else {
                      // Skip expired events
                      logger.log(message: "Skipped expired event: \\(storedEvent.eventType)")
                      markProcessed(eventId: storedEvent.id)
                  }
              }
          }
      }
      
      // Check if event is still valid for replay
      private func isEventStillValid(_ event: Bindings.Event, storedAt: Date) -> Bool {
          let age = Date().timeIntervalSince(storedAt)
          
          switch event.getValueType() {
          case .PaymentClaimable:
              // Check claim deadline
              if let claimable = event.getValueAsPaymentClaimable(),
                 let deadline = claimable.getClaimDeadline() {
                  return UInt64(Date().timeIntervalSince1970) < deadline
              }
              return age < 86400 // 24 hours
              
          case .PendingHTLCsForwardable:
              // Always process pending forwards
              return true
              
          case .SpendableOutputs:
              // Always process spendable outputs
              return true
              
          case .FundingGenerationReady:
              // Funding should be processed within reasonable time
              return age < 3600 // 1 hour
              
          default:
              // Default: events valid for 24 hours
              return age < 86400
          }
      }
      
      // Serialize/deserialize helpers
      private func deserializeEvent(_ data: Data) -> Bindings.Event? {
          let result = Bindings.Event.read(ser: [UInt8](data))
          return result.isOk() ? result.getValue() : nil
      }
      
      private func saveEvent(_ event: StoredEvent) {
          let eventPath = eventsDirectory.appendingPathComponent("\\(event.id).json")
          
          do {
              let encoded = try JSONEncoder().encode(event)
              try encoded.write(to: eventPath)
          } catch {
              logger.log(message: "Failed to save event: \\(error)")
          }
      }
      
      private func loadEvent(from url: URL) -> StoredEvent? {
          do {
              let data = try Data(contentsOf: url)
              return try JSONDecoder().decode(StoredEvent.self, from: data)
          } catch {
              return nil
          }
      }
      
      private func pruneOldEvents() {
          do {
              let files = try FileManager.default.contentsOfDirectory(
                  at: eventsDirectory,
                  includingPropertiesForKeys: [.creationDateKey]
              ).sorted { file1, file2 in
                  let date1 = try? file1.resourceValues(forKeys: [.creationDateKey]).creationDate
                  let date2 = try? file2.resourceValues(forKeys: [.creationDateKey]).creationDate
                  return (date1 ?? Date.distantPast) < (date2 ?? Date.distantPast)
              }
              
              // Remove old events if we exceed limit
              if files.count > maxStoredEvents {
                  let toRemove = files.prefix(files.count - maxStoredEvents)
                  for file in toRemove {
                      try FileManager.default.removeItem(at: file)
                  }
              }
              
              // Remove processed events older than 7 days
              let cutoffDate = Date().addingTimeInterval(-7 * 24 * 60 * 60)
              for file in files {
                  if let event = loadEvent(from: file),
                     event.processed && event.timestamp < cutoffDate {
                      try FileManager.default.removeItem(at: file)
                  }
              }
              
          } catch {
              logger.log(message: "Failed to prune events: \\(error)")
          }
      }
  }
  
  // Stored event structure
  struct StoredEvent: Codable {
      let id: String
      let timestamp: Date
      let eventType: Int
      let eventData: Data
      var processed: Bool
  }
  
  // Event recovery during startup
  extension LDKEventHandler {
      func performEventRecovery() async {
          logger.log(message: "Starting event recovery...")
          
          await EventPersistence.shared.replayUnprocessedEvents(handler: self)
          
          logger.log(message: "Event recovery completed")
      }
  }
  
  // Graceful shutdown
  extension LDKEventHandler {
      func prepareForShutdown() {
          // Process any pending events
          channelManager.processPendingHtlcForwards()
          
          // Wait for event processing to complete
          Thread.sleep(forTimeInterval: 0.5)
          
          logger.log(message: "Event handler prepared for shutdown")
      }
  }`.trim()
      };
  
      try {
        const code = eventExamples[args.eventType];
        if (!code) {
          throw new Error(`Unknown event type: ${args.eventType}`);
        }
  
        return {
          content: [{
            type: 'text',
            text: JSON.stringify({
              success: true,
              eventType: args.eventType,
              swiftCode: code,
              description: `LDK event handling implementation for ${args.eventType}`
            }, null, 2)
          }]
        };
      } catch (error) {
        return {
          content: [{
            type: 'text',
            text: JSON.stringify({
              success: false,
              error: error instanceof Error ? error.message : 'Unknown error'
            }, null, 2)
          }],
          isError: true
        };
      }
    }
  };

• src/tools/eventHandling.ts:6-24 (schema)

  Input schema defining the eventType parameter with specific enum values for different LDK event handling categories.

  inputSchema: {
    type: 'object',
    properties: {
      eventType: {
        type: 'string',
        enum: [
          'all_events',
          'payment_events',
          'channel_events',
          'funding_events',
          'spendable_outputs',
          'forwarding_events',
          'event_persistence'
        ],
        description: 'Type of event handling to get code for'
      }
    },
    required: ['eventType']
  },

• src/index.ts:34-34 (registration)

  Import statement for the eventHandlingTool.

  import { eventHandlingTool } from './tools/eventHandling.js';