read-contract.ts•1.53 kB
import { FastMCP } from "fastmcp";
import { z } from "zod";
import { readContract } from "@wagmi/core"
import { wagmiConfig } from "../wagmi-config.js";
import { Abi, Address, TransactionExecutionError } from "viem";
export function registerReadContractTools(server: FastMCP): void {
server.addTool({
name: "read-contract",
description: "Call a read-only function on a contract, and returning the response",
parameters: z.object({
abi: z.string(),
address: z.string(),
functionName: z.string(),
args: z.string().array()
}),
execute: async (_args) => {
try {
const abi = JSON.parse(_args.abi) as Abi
const address = _args.abi as Address
const functionName = _args.functionName
const args = _args.args
const result = await readContract(wagmiConfig, {
abi,
address,
functionName,
args,
})
return {
content: [
{
type: "text",
text: `${result}`,
},
],
}
} catch (error) {
if (error instanceof TransactionExecutionError) {
return {
content: [
{
type: "text",
text: error.cause.message,
}
]
}
}
return {
content: [
{
type: "text",
text: (error as Error).message,
}
]
}
}
},
});
};