Make Claude Cowork your vessel clerk.
Two renewal clocks running on different anchors, three titles for a boat with two outboards, a date stamped on the bottom of a fire extinguisher that means something specific, and a registration renewal that arrives disguised as a county tax bill. None of it is hard. All of it is easy to miss.
You: the one who walks the boatCowork: the clerk that keeps the dates
A disposable extinguisher is expired 12 years after its date of manufacture. That figure appears nowhere in the regulations — it is a marking on the bottle, enforced through two words in .
The useful promise
Walk the boat. Delegate the dates.
A boat’s paperwork is not complicated, it is just scattered across four systems that do not talk to each other and do not run on the same calendar. The Coast Guard has one clock. The state has another. The county sends the bill for the second one. And the equipment aboard has its own set of dates printed in small type on the items themselves.
Every one of those is a date arithmetic problem with a document behind it, which is exactly the kind of work Claude Cowork is good at — reading a certificate, computing a due date from a stated anchor, showing its arithmetic, and telling you what is missing before the season starts rather than after a boarding.
What it cannot do is look at the boat. It does not know how many life jackets are in the locker, whether the gauge is in the green, or what date is stamped on the bottom of the extinguisher. It only knows what somebody read off the item and wrote down. Which means the most useful thing this plugin produces is not a list of what is expired. It is the list of what has no date recorded at all.
The operating loop
Seven handoffs. A boat that never lapses quietly.
You supply what you read off the boat. Cowork turns it into dated records on a cadence. The point is not to automate the walk-around — it is to make sure the walk-around is the only thing you have to remember.
Establish identity
HIN off the hull, official number and net tonnage off the certificate, serial number off every motor. Read them, do not copy them from a listing.
Sort the systems
Documented, state-registered, or both. Then a file per title — the watercraft and each outboard over 5 horsepower are titled separately.
Date the clocks
Every renewal computed from a stated anchor with the arithmetic shown. The COD’s expiry, the decal month, the date of purchase. They are not interchangeable.
Read the items
Walk the boat once with a blank sheet and record what is actually stamped on each extinguisher and printed on each flare. Anything not read stays marked not read.
Log it
Date, engine hours, what was done, who did it, the receipt — and what was noticed but not fixed. That last field is the one everybody skips.
Audit
Recompute every date from its anchor. Report what passed, what is inside 90 days, what is missing, and where two files disagree with each other.
Hand over a blank sheet
Not a result. A pre-departure sheet with empty boxes, for a person to walk the boat and initial. The completed sheet is what becomes the record.
The folder is the ship’s papers
Give Cowork a narrow, legible workspace.
Vessel_[NAME_or_HIN]/ ├── 00_INBOX_not_yet_filed/ ├── 01_IDENTITY_hin_motors_purchase/ ├── 02_FEDERAL_documentation/ ├── 03_STATE_titles_registration_tax/ ├── 04_EQUIPMENT_register/ ├── 05_MAINTENANCE_hours_and_service/ ├── 06_INSURANCE_and_survey/ ├── 07_RENEWALS_register_and_audits/ └── 99_REFERENCE_rules_with_dates/
Connect only this folder, never an entire home directory. Put a short memo at the top: the boat, the HIN, whether it is documented, the official number if so, every motor and its serial, and the county that bills the property tax.
Keep the source register beside it. Every rule cited gets its section number, its URL and the date it was checked — because Coast Guard fee schedules are revised periodically, forms get reissued, and the state pages are legacy explainers with no update date shown. A register is what makes stale guidance visible instead of invisible.
Do not put full account or card numbers in this folder, or passwords for the documentation portal, the county tax site or the insurer, or Social Security or driver’s licence numbers, or unredacted identity documents. A boat’s record needs none of them. Cowork sessions may process connected files on Anthropic’s servers.
Three prompts that install the clerk.
Use these as starting instructions and replace the bracketed fields. Keep every filing and payment in manual-approval mode.
“Use only this folder. This is a [YEAR MAKE MODEL], HIN [HIN], kept in [COUNTY] County, South Carolina. It [is / is not] federally documented. Read the documents I have put in here and build the folder, then a renewal register with every date computed from a stated anchor and the arithmetic shown. For the Coast Guard clock give me both edges of the window — the earliest sensible renewal date and the date the late fee starts. Cite the section number and the date you checked it for every rule. Do not file or pay anything.”
“I am going to walk the boat and read things to you. For each fire extinguisher record where it is stowed, whether it is disposable or rechargeable, and the date of manufacture stamped on the bottle. For each flare record the printed expiration date. Count the wearable and throwable PFDs. Compute the expiry dates and show the arithmetic. Anything I do not read to you stays marked NOT READ — do not estimate from the boat’s age. Then give me three lists: passed, due inside 90 days, and no date recorded.”
“Recompute every date in the renewal register from its anchor and show the arithmetic again — do not trust the last run. Then report, in order: anything already expired; anything due inside 90 days; records that should be in this folder by now and are not; places where two files disagree; and any ‘noticed but not fixed’ item that has come up more than twice. Do not tell me the boat is ready. Tell me what you found.”
The real automation
Make the boring part impossible to forget.
Nothing here is difficult. A lapsed documentation, an unopened tax bill, a twelve-year-old extinguisher and an outboard nobody ever titled are all failures of memory, not of seamanship. Give Claude Cowork one narrow folder, the current rules with their dates, and a monthly cadence, and the only thing left to remember is the part that was always yours: walking the boat and looking at it. You inspect and you sign. It keeps the record.
Charleston AI built The Vessel Clerk and installs it on your own laptop, at the lab in Charleston — see what it costs and book it. Claude Cowork gets installed first if you do not have it. Also built: The Estate Clerk, for South Carolina probate paperwork.
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