Goals for the balance sheet agent
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I want to connect the liabilities of one balance sheet with the corresponding 
assets of another.

Suppose one balance sheet shows a liability of "Deposit", and another shows
an asset of "Deposit".  Then the balance sheet holding the "Deposit" as an 
asset withdraws 100. I would like the software automatically attach "+ 100" to 
the balance sheet with "Deposit" as an asset, and also attach "- 100" to the 
balance sheet with "Deposit" as a liability.

To handle this automatic operation, I might first tell the balance sheet with 
"Deposit" as an asset: "Withdraw 100 from your deposit account at the bank." 
Then the software would attach "+ 100" to the "Deposit" asset of that balance 
sheet. Then I would have the program search for the balance sheet with 
"Deposit" as a liability (perhaps using a unique name for the "Deposit" if there
are numerous "Deposits" listed as liabilities on several balance sheets), and 
attach "- 100" to that "Deposit" liability.

I also want to be able to instruct a balance sheet, via a natural language 
agent interface, that it has become illiquid or insolvent, or that it is in 
danger of doing so, etc.

A dialog might go something like this (reflecting the slide titled "Immature 
Solvency Backstop" in Lecture 21-3 of the "Economics of Money and Banking, 
Part Two" class):

---
"Investment Bank: your assets are a Hi CDS and loans. Your liabilities are Mid 
CDS and Lo CDS."

"Shadow Bank: your assets are Hi Tranche and Hi CDS. Your liabilities are MM 
Funding."

"Pension/Insurance: your assets are Mid Tranche and Mid CDS. Your liabilities 
are DB/Annuity and Capital."

"Hedge Fund: your assets are Lo Tranche and Lo CDS. Your liabilities are Loans 
and Capital."

"Insurance: your liabilities are Hi CDS and Capital."

"CDO: your assets are RMBS. Your liabilities are Hi Tranche, Mid Trance, and 
Lo Tranche."
---

Then, I might say something like: "Insurance: you go away. Investment Bank: you go away." What are the repurcussions on the remaining balance sheets?

In this way, I hope to construct a model of the shadow banking system, composed 
of balance sheet agents interacting with each other. Each asset is some other 
agent's liability, so when an asset depreciates or a liability disappears, 
other agents will have their balance sheets modified automatically.