The Finance AI Stack
Build an AI layer for Finance where every number re-adds and every decision stays human.
Organization Edition: one legal entity, internal sharing, no seat cap: $349
“Battle-tested in production environments.”
The situation
A variance agent that invents a driver is worse than no agent. A morning brief that quietly turns a forecast into an actual is worse than no brief. And a reconciliation agent that lands on a convenient zero has manufactured confidence out of bad accounting, which is the one failure a controls function cannot absorb.
None of that shows up in a demo, because demos run on tidy inputs. It shows up in the month where a total does not reconcile and nobody notices, and the number leaves the room with your name under it.
What this is
The Finance AI Stack is the instruction layer for a finance function: one hundred finance activities classified by operating mode, ten agents built and run on a Microsoft 365 test tenant, eleven gated workflows, fifty engineered prompts, and a 30-day sprint with a gate at the end of every week.
The test set carries the failures on purpose: totals that do not reconcile, a claimed driver with no data behind it, EUR forecasts against USD actuals, a period mismatch buried in a header, a planted exact fit that zeroes the unexplained remainder, and three turns of pressure to drop an inconvenient exception. PASS means the agent caught the inconsistency and named it. Explaining it confidently was a fail.
The ledger ships with the pack and keeps its failures. 59 adversarial scenarios, 115 recorded runs, 87 passing on the instruction set that ships, 25 instruction defects found and 24 corrected before release. The twenty-fifth is named, unfixed, and sits behind a mandatory human control, because rewriting an agent until a run passes is test-fitting rather than a control.
What is inside
- The 100-row Finance AI map: every major finance activity classified (43 agent-led with review, 19 AI-assisted, 14 automate, 22 never automate, 2 human only), with your own posture, priority and owner columns
- Ten agents with ten implementation guides: paste-ready instruction files with character counts, so a truncated paste cannot masquerade as a working agent, and one guide per agent from a blank Agent Builder form to a run you graded yourself
- Fixtures and answer keys: eleven poisoned inputs, ten buyer answer keys, and 38 equations you re-add by hand, so "it works on my tenant" stops being an opinion
- The full test ledger: every failure with its cause, the fix, and the re-run that passed, plus the reason there is no fix for the four runs that never passed
- Fifty engineered prompts, eleven gated workflows, the decision matrix that gives the next AI idea a lane instead of a debate, a governance page with mechanisms instead of posters, eight templates and an AI estate register
- A 20-page Playbook PDF and a 13-tab workbook, including the assumption register and the value scorecard your CFO reads at day 30. 81 files in one zip, split into vendor-neutral methodology and the Microsoft implementation.
Who it is for
- Finance managers and controllers who want AI inside the control environment rather than beside it
- FP&A and reporting leads who will be asked where a variance explanation came from
- The person who has to defend a number after an agent helped produce it
Who it is not for
- Anyone wanting autonomous payment release, autonomous journal posting, or autonomous sign-off. The stack refuses all three by design, and the never-automate list is part of the product.
- Teams without a Microsoft 365 Copilot licence with Agent Builder. This is the instruction layer for a platform you already pay for; it does not include, replace or discount the licence.
- Consultants delivering it as paid training: that needs the Practitioner licence (email mathieu@kesslernity.com), not either edition here.
Not sure yet? Start free.
First 10 Finance AI Opportunities is free and covers the same ground at a smaller scale. If it is useful, this is the full version.
Download First 10 Finance AI OpportunitiesQuestions people actually ask
What is the difference between the two editions?
The files are identical across the two editions; you are choosing usage rights, not features. Individual ($99) licenses one named purchaser for their own work. Organization ($349) licenses one legal entity: share it across the finance function, no per-seat cap. A subsidiary that operates as its own company needs its own copy.
What does the testing actually establish?
One author, one Microsoft 365 test tenant, one day: 59 adversarial scenarios and 115 recorded runs, with 87 passing on the instruction set that ships. The pack has an honesty page, TESTING-SCOPE, that states what that does and does not establish. It does not claim independent reproducibility, or durability across future Copilot model updates, and it claims nothing at all about the quality of your own source data.
You ship a limitation you did not fix. Why?
The CFO Morning Brief does not reliably notice that a GL cash line and a bank total are meant to be the same quantity. Four versions of the instructions did not fix it, so the control stays with the human and the pack names the check they own. The failing test is still in the ledger. Deleting it would have been the easier product and the worse one.
Why does Finance have a heavier never-automate list than IT?
Because that is the honest shape of a controls function: 22 never-automate rows and 2 human-only, against 16 and 2 in the IT stack. If a vendor finance-AI deck shows fewer prohibitions than this, the useful question is which control they deleted.
How is this different from the IT AI Stack?
Same method, different function, and neither contains the other. The IT stack classifies IT activities and tests IT agents; this one classifies finance activities and grades finance arithmetic. Buying both is reasonable for a person who spans the two, and buying one is enough for a person who does not.
Buying this with a company card?
Most buyers expense it. Your receipt email carries a Generate link that opens an invoice generator: add your billing address, put your legal company name and any reference your finance team needs in the Additional notes box, and download the PDF. If you have an EU VAT number, enter it at checkout and no VAT is charged. Here is the approval email, so you do not have to write one.
Subject: Approval request: The Finance AI Stack ($99, one-time) Hi [Manager], I would like to expense a one-time $99 purchase: The Finance AI Stack by Kesslernity. What it is: Build an AI layer for Finance where every number re-adds and every decision stays human. What we get: - The 100-row Finance AI map: every major finance activity classified (43 agent-led with review, 19 AI-assisted, 14 automate, 22 never automate, 2 human only), with your own posture, priority and owner columns - Ten agents with ten implementation guides: paste-ready instruction files with character counts, so a truncated paste cannot masquerade as a working agent, and one guide per agent from a blank Agent Builder form to a run you graded yourself - Fixtures and answer keys: eleven poisoned inputs, ten buyer answer keys, and 38 equations you re-add by hand, so "it works on my tenant" stops being an opinion - The full test ledger: every failure with its cause, the fix, and the re-run that passed, plus the reason there is no fix for the four runs that never passed Why it is worth it: it is a one-time purchase with future updates included, and it costs less than an hour of any consultant we would otherwise ask. The author publishes the open-source Copilot prompt library that Microsoft's CMO for AI at Work cited as "battle-tested in production environments". A downloadable invoice is available from the purchase receipt for expenses. [Your name]
The Finance AI Stack
Build an AI layer for Finance where every number re-adds and every decision stays human.
Get it for $99Licensed, not sold. The full License & Terms apply. Kesslernity is an independent publisher: this is independent analysis, not affiliated with, sponsored by, or endorsed by Microsoft. It is practitioner guidance, not professional, legal, or financial advice.