Model Context Protocol Server for Solana Client

Instructions

Implementation Reference

• src/server.py:442-467 (handler)

  The handler function for the 'get_fee_for_message' MCP tool. It constructs a Solana transfer message from the input parameters and uses the AsyncClient to retrieve the required fee via get_fee_for_message RPC method. The @mcp.tool() decorator handles registration and schema inference from the signature and docstring.

  @mcp.tool()
  async def get_fee_for_message(from_pubkey: str, to_pubkey: str, lamports: int) -> str:
      """Returns the fee for a message.
  
      Args:
          from_pubkey (str): Sender's public key
          to_pubkey (str): Recipient's public key
          lamports (int): Amount of lamports to transfer
  
      Returns:
          str: Fee information
      """
      async with AsyncClient(rpc_url) as client:
          msg = Message(
              [
                  transfer(
                      TransferParams(
                          from_pubkey=Pubkey.from_string(from_pubkey),
                          to_pubkey=Pubkey.from_string(to_pubkey),
                          lamports=lamports,
                      )
                  )
              ]
          )
          fee = await client.get_fee_for_message(msg)
          return f"Message fee: {fee}"