MCP Helius

Instructions

Implementation Reference

• src/handlers/helius.ts:159-175 (handler)

  The handler function that implements the logic for fetching a Solana transaction by signature using the Helius RPC connection.

  export const getTransactionHandler = async (input: GetTransactionInput): Promise<ToolResultSchema> => {
    try {
      // Use the newer signature with explicit config object
      const transaction = await (helius as any as Helius).connection.getTransaction(
        input.signature,
        { maxSupportedTransactionVersion: 0, commitment: input.commitment as any }
      );
      
      if (!transaction) {
        return createErrorResponse(`Transaction not found for signature: ${input.signature}`);
      }
      
      return createSuccessResponse(`Transaction details: ${JSON.stringify(transaction, null, 2)}`);
    } catch (error) {
      return createErrorResponse(`Error getting transaction: ${error instanceof Error ? error.message : String(error)}`);
    }
  }

• src/tools.ts:125-136 (schema)

  The input schema defining parameters for the helius_get_transaction tool: signature (required) and optional commitment level.

  {
    name: "helius_get_transaction",
    description: "Get a transaction by its signature",
    inputSchema: {
      type: "object",
      properties: {
        signature: { type: "string" },
        commitment: { type: "string", enum: ["confirmed", "finalized", "processed"] }
      },
      required: ["signature"]
    }
  },

• src/tools.ts:558-558 (registration)

  Registration of the tool name to its handler function in the handlers dictionary.

  "helius_get_transaction": getTransactionHandler,

• src/tools.ts:12-12 (registration)

  Import of the getTransactionHandler from the helius handlers module.

  getTransactionHandler,