Connect your firm’s GitHub repository.
Keystone reads the skills where your experts already keep them, with read-only access to your repository.
For professional services firms
Your firm’s AI skills.Your rules.
Turn your experts’ methods into AI skills the whole firm can use in Claude. Results you can rely on. A method that stays yours.
Private preview · Places for a small number of firms
Skill registerHarbour & Co · Week 45
| Skill | Staff | Runs | Review |
|---|---|---|---|
| rsu-tax-analysis | 6 | 14 | |
| cgt-share-sale | 9 | 12 | |
| engagement-letter | — | — | Approve |
| Runs this week | 26 |
Every run recordedIllustrative
Why firms hold back
AI is fast. Can you rely on it?
Two things keep AI away from real client work: answers you can’t trust, and expertise you can’t control.
Reliability
Will it give the same answer twice?
Ask a model to do the maths and it may take a different path each time. A reviewer can’t tell which steps were reasoned and which were made up.
Quality
Who checked the method?
Prompts and skills spread by copy and paste, untested and unversioned. Nobody knows which one produced the result.
Ownership
Who has a copy?
Sharing a skill means handing over the file. It can be forwarded, edited or taken to the next firm.
Accountability
Who used it, and for whom?
There’s no record of which version ran, on which client, or who reviewed the result.
Reliable by design
Your experts write the method. Scripts do the maths.
A Keystone skill splits the work. AI reads documents and follows the judgement your expert wrote down. Scripts do every calculation, so the same inputs give the same numbers every time.
Example skill · RSU tax analysis
Inside the skill
MDSKILL.mdThe method, written by your tax partner: what to read, what to ask, when to flag for review
PYscripts/fx_convert.pyConverts each vest and sale to AUD at the published exchange rate
PYscripts/cost_base.pyCalculates cost base, gain and discount, to the cent
5tests/Five cases with known answers, run before every version goes live
One run, step by step
Who did what
AIReads 3 broker statements and finds 4 vests and 1 sale0.8s
SCRIPTConverts USD to AUD for each event0.1s
SCRIPTCalculates cost base and capital gain0.1s
AIDrafts the working paper and flags 2 judgement calls2.4s
PERSONReviewer checks the flags and signs off—
Run 1$12,480.15
Run 2$12,480.15
Run 3$12,480.15
AIreads and draftsSCRIPTcalculates, the same way every timePERSONreviews and signs off
Illustrative figures
How it works
From your experts to every desk.
Five steps. A partner stays in control at each one.
- 01Add
- 02Check
- 03Approve
- 04Use
- 05Oversee
Every file read. Every version tested.
Keystone lists what each skill needs and runs its test cases with known answers before anyone can use it.
You decide who can use each version.
A partner approves each version and chooses the teams. New commits wait for approval before staff can use them.
Staff get the result, not the method.
Staff ask in Claude as usual. The skill runs on Keystone’s server, and only the result comes back.
Every run on record.
See who ran which version, for which client, and who signed off the result.
Product tour
See it end to end.
Fifty seconds, from adding a skill to signing off the result. Illustrative data.
Private preview
Become a founding firm.
We’re choosing a small number of Australian professional services firms to shape Keystone with us.
Early access
Bring your experts’ own skills onto Keystone first.
A say in the roadmap
Your practice areas shape what we build next.
Founder-led onboarding
We set it up with your team, skill by skill.