Alpaca Trading API integration for Model Context Protocol (MCP)
Nothing to run from here
0s and 1s CIS calculators is installed from its publisher's own source and answers where it runs, so this marketplace is not in the path of a single call. There is no address here to send one to, and a panel that pretended otherwise would be showing you an answer we made up. Install it and call it from your own client — the Installation tab has the entry for each one.
96/100
tool-list score
7
tools declared
remote
at its publisher
—
calls last 7d
What it does
Free UK CIS calculators: deductions, deadlines, late penalties, gross payment test, verification.
Quickstart
# 1 — add it to Claude Code
claude mcp add --scope user --transport http 0s-and-1s-cis-calculators-mcp https://0sand1s.co.uk/mcp
# 2 — ask your agent for something these tools do
# cis_deduction, cis_gross_up, cis_tax_month and 4 more
0s and 1s CIS calculators costs nothing on mcprush: there is no plan to choose here, no cap to set and nothing mcprush can bill you for.
Publishernot claimed
0SAll 1 server
0sand1s1 server
1 category
Collected from a public index. Nobody has claimed this account, so nothing here was written by its author — claim it if it is yours.
Installation
Where are you running it?
Every route below installs the same thing and ends at the same approval screen. Nothing here runs on your machine and nothing runs on ours: this server answers at its publisher’s own address, and what you install is the connection straight to it.
Claude Codedeclared by this listing
This is a public server: it answers at its publisher’s own address and this marketplace is not in the path. Claude Code registers it in one command; --scope user makes it available in every project. The transport below is http, as the publisher's own manifest declares it.
claude mcp add --scope user --transport http 0s-and-1s-cis-calculators-mcp https://0sand1s.co.uk/mcpReconnect, or start a new session, and the tools appear in the model’s tool list.
Free on mcprush, and it answers at its publisher’s own address: this marketplace is not in the path, so there is no key of ours to hold and no card to add.
What it writes
One config entry pointing straight at the publisher’s own address — this marketplace is not in the path, and nothing from this listing executes on your machine.
What you approve
7 tools, with what each one reads, writes and reaches shown before you agree — the same list on every route above. Read the tool surface.
Tool surface
What the model actually sees. Descriptions are diffed on every release — see version history.
Works out the CIS deduction on a payment to a subcontractor, from the gross bill to the net payment. Takes the gross including VAT, the VAT, the subcontractor's materials and the rate (0, 20 or 30). VAT is never taxed under CIS and materials come off before the rate applies; the deduction is rounded down to the penny. Returns each step of the working, money in pence and pounds. Does not cover rete
| Parameter | Type | Required | Notes |
|---|---|---|---|
| gross | string | yes | The amount being paid, including any VAT, before the CIS deduction. Pounds, as a string like "1,200.00" or a number like 1200. |
| vat | string | no | The VAT within the gross. Leave out or 0 under the domestic reverse charge. Pounds, as a string like "1,200.00" or a number like 1200. |
| materials | string | no | What the subcontractor paid for materials, plant hire, consumables and fuel (not travel) on the job. Without VAT if the subcontractor is VAT registered, with it if not. Pounds, as a string like "1,200 |
| rate | integer | yes | The subcontractor's CIS rate in per cent: 20 if registered, 30 if not registered or unmatched when verified, 0 for gross payment status |
Finds the gross amount (excluding VAT) that leaves a given net payment after the CIS deduction, for a subcontractor quoted a take-home figure. Takes the net, the subcontractor's materials and the rate (0, 20 or 30). Where rounding lets two grosses give the same net, the larger is returned so CIS is never under-deducted. Returns the forward working on that gross, money in pence and pounds. VAT is n
| Parameter | Type | Required | Notes |
|---|---|---|---|
| net | string | yes | The payment the subcontractor should receive after the CIS deduction, excluding VAT. Pounds, as a string like "1,200.00" or a number like 1200. |
| materials | string | no | The subcontractor's materials within the payment, as for cis_deduction. Pounds, as a string like "1,200.00" or a number like 1200. |
| rate | integer | yes | The subcontractor's CIS rate in per cent: 20 if registered, 30 if not registered or unmatched when verified, 0 for gross payment status |
For a date, gives the CIS tax month it falls in (the 6th to the 5th), the tax year, the date the monthly return (CIS300) is due (the 19th, also the date for paying HMRC by any means other than electronically), and the date for paying HMRC electronically (the 22nd, moved back to the banking day before when the 22nd is a weekend or an England and Wales bank holiday). Bank holidays are known to bank_
| Parameter | Type | Required | Notes |
|---|---|---|---|
| date | string | yes | Any date, such as a payment date or today, YYYY-MM-DD |
Works out the late filing penalties on one monthly CIS return under Finance Act 2009 Schedule 55: £100 the day after the 19th, £200 at 2 months, then the greater of £300 and 5% of the deductions at 6 and at 12 months (5% alone for a first return). Takes the tax year and month, the filing date or none, today's date, the deductions and whether a return had been filed before. Returns each penalty wit
| Parameter | Type | Required | Notes |
|---|---|---|---|
| tax_year | integer | yes | The tax year, by the calendar year it starts in: 2026 for 6 April 2026 to 5 April 2027 |
| tax_month | integer | yes | The tax month, 1 to 12: 1 is 6 April to 5 May, 12 is 6 March to 5 April |
| filed_on | string | no | The day the return was filed. Leave out or null if it has not been filed, YYYY-MM-DD |
| as_at | string | yes | Today's date. Penalties on a return not yet filed run to this date, YYYY-MM-DD |
| deductions | string | no | The CIS deductions the return shows, or would show. Leave out or 0 for a nil return. Pounds, as a string like "1,200.00" or a number like 1200. |
| filed_before | boolean | no | true if the contractor had already filed a CIS return before this one was due (the usual case). false for the first return, which has no £300 minimum |
Checks the turnover test for CIS gross payment status (Finance Act 2004 Schedule 11, SI 2005/2045 reg 28): £30,000 net construction turnover for a sole trader; for a partnership or company, the lower of £30,000 for each partner or relevant person and £100,000. In a close company, shareholders count as well as directors. Returns the figure needed by each route, which one applies, and how far short.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| business_type | string | yes | The subcontractor's business: sole-trader, partnership or company |
| partners | integer | no | Partnership only: the number of partners, the highest at any one time in the 12 months |
| directors | integer | no | Company only: the number of directors, the highest at any one time in the 12 months |
| close_company | boolean | no | Company only: true if it is a close company (controlled by 5 or fewer people, or by its directors) |
| shareholders | integer | no | Close company only: shareholders who are not also directors, each counted once |
| net_turnover | string | yes | Construction turnover for the last 12 months, less VAT and the cost of materials. Pounds, as a string like "1,200.00" or a number like 1200. |
Says whether a contractor must verify a subcontractor with HMRC before paying them (SI 2005/2045 reg 6): not needed if the subcontractor was on one of this contractor's CIS returns, or was verified by this contractor, in the tax year of the payment or the two before. Takes the payment date, the tax years the subcontractor was on a return and the last verification date, all supplied by the caller.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| payment_date | string | yes | The date of the payment about to be made, YYYY-MM-DD |
| included_on_return_in_tax_years | array | no | Tax years (by the year each starts in) in which this contractor included the subcontractor on a CIS return. An array, or comma-separated like "2025,2026" |
| last_verified_on | string | no | The date this contractor last verified the subcontractor with HMRC, if ever, YYYY-MM-DD |
Says whether a contractor must file a CIS nil return for a tax month (SI 2005/2045 reg 4(9A) and (9B), inserted by SI 2026/289 from 6 April 2026): due when a mainstream contractor that has paid subcontractors before pays none that month, unless it told HMRC no later than 14 days before the month started. Takes the tax year and month and yes or no answers. Returns whether a nil return is due, why,
| Parameter | Type | Required | Notes |
|---|---|---|---|
| tax_year | integer | yes | The tax year, by the calendar year it starts in: 2026 for 6 April 2026 to 5 April 2027 |
| tax_month | integer | yes | The tax month, 1 to 12: 1 is 6 April to 5 May, 12 is 6 March to 5 April |
| paid_subcontractors_in_month | boolean | yes | true if any subcontractor was paid in that tax month, gross payments included |
| paid_subcontractors_before | boolean | yes | true if the contractor had paid any subcontractor before that tax month started |
| mainstream_contractor | boolean | no | true for a mainstream contractor (a construction business). false for a deemed contractor, which is outside the nil return rule |
| told_hmrc_no_payments_on | string | no | If the contractor told HMRC in advance that no payments would be made in that month, the date it did so. Leave out if not, YYYY-MM-DD |
Free
$0 forever
- Every tool — any call limit is its publisher’s, not ours
- No card, and mcprush charges nothing for it
- Runs at its publisher’s own address — this marketplace is not in the path
- Nothing to cap, because mcprush bills nothing
What counts against your monthly calls
| Tool | Unit | Calls used | Out of the allowance |
|---|
Nothing here is billable: mcprush charges nothing to install 0s and 1s CIS calculators or to call it, at any volume.
Call allowance · this installenforced at the gateway
Monthly allowance, in calls
—
—
Alert at 80% · then the tool returns a normal MCP error
Used this month: —
ATool-list grade · score 96 / 100
Release 1.0.1 · scanned 20 Oct 2026
Graded from the tools this server lists, not from its source code.
Two independent axes, because powerful and malicious are different questions. The grade is threat only. The capability level is blast radius, and it is never a penalty on the grade — it is priced as one subtract-only term in the score, where you can see it.
Threat score100
Client score96
Findings0 threat · 0 capability
Capabilityminimal
Coveragemanifest
Verificationnot in this report
Surface digest6d1c2d468545ec8388b8cb18b078fb15d79c71bee4bcab2eb30be2b8903dc37a
Score vectorthreat 100 → client 96
| Term | Level | What it prices | Points |
|---|---|---|---|
| capability-exposure | minimal | capability blast radius (minimal) — client exposure if the model is manipulated | −0 |
| coverage-honesty | manifest | inspection depth (manifest) — how much of the target the scan could see | −4 |
score = clamp(round(threatScore − E_cap − E_ver − E_cov), 0, 100). No model, no opinion, no network call at scoring time: the same methodology version against the same bytes always produces this number, and every line above is a field of the report rather than a summary of it.
What the scan could actually read
A grade is only as meaningful as its coverage, so the scanner publishes its own depth before it publishes its result.
The scan read each tool’s name, description, input schema and annotations exactly as the server listed them the last time it answered us; no code was reviewed. We ask the server again about once a month, and a list that changed is graded again.
Tool surfaceread
Implementation sourcenot available
Package metadatanot available
Live transportnot available
The implementation source was not read — this reflects the declared tool metadata only.
Capability — what it could do if the model were manipulated
Tags derived from each tool’s schema and the implementation, not from what the tool calls itself. minimal is the level these add up to.
| Tool | Capability tags | Why the tag was assigned |
|---|---|---|
| cis_deduction | no tags | |
| cis_gross_up | no tags | |
| cis_tax_month | no tags | |
| cis_late_penalties | no tags | |
| cis_gross_payment_turnover_test | no tags | |
| cis_needs_verification | no tags | |
| cis_nil_return_check | no tags |
Toxic-flow graph
The lethal trifecta, checked as a graph rather than as a checklist: untrusted input, a sensitive source and an external sink have to meet before there is a path worth worrying about.
The public result for this release does not print the flow graph, so there is nothing to show here. That is not the same as "no paths were found": what the scan did read is above, under coverage.
Supply chain and provenance
Integrityfirst-seen
Surface digest6d1c2d468545ec83
Scanned2026-10-20
This is the first scan of this surface here, so there is nothing yet to compare it against.
Every result on this tab comes from one deterministic pass over the published package — offline, rule by rule, and auditable line by line above. Same methodology version, same bytes, same score.
Release history
This is an address its publisher runs: which release it serves is theirs to choose, so there is nothing here to pin. The history below is for reading; the current release on file is 1.0.1.
1.0.1
undated
latestNo release note was published with this version.
—
no reviews yet
Who can review
One review per account, from a signed-in account that does not publish this listing. Nothing else is asked — you can say what you think before you install it. Publishers can reply once per review, and a review can be edited or deleted by whoever wrote it.
Sign in to write one
Any signed-in account that does not publish 0s and 1s CIS calculators can review it, once — before installing it or after. A review from an account that has installed it is marked as one.
No reviews yet
Nobody has reviewed this listing. The rating on the card is the mean of the reviews written here and nothing else, so there is no rating until somebody writes the first — which takes a signed-in account that does not publish it, and nothing else.