Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add Jody09-dotcom/constructionx-skills --skill cis-verificationgit clone --depth 1 https://github.com/Jody09-dotcom/constructionx-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/jody09-dotcom/constructionx-skills/cis-verification)<a href="https://agentmods.dev/skills/jody09-dotcom/constructionx-skills/cis-verification"><img src="https://agentmods.dev/badge/skills/jody09-dotcom/constructionx-skills/cis-verification/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/jody09-dotcom/constructionx-skills/cis-verification"><img src="https://agentmods.dev/badge/skills/jody09-dotcom/constructionx-skills/cis-verification.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00089 | $0.01515 |
| Opus 5 | $0.00044 | $0.00758 |
| Sonnet 5 | $0.00018 | $0.00303 |
| Haiku 4.5 | $0.00009 | $0.00152 |
Grade A, and why
cis-verification scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 141 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CIS Verification
This skill walks a UK main contractor through the Construction Industry Scheme (CIS) subcontractor verification process and calculates the correct CIS deduction from a payment. Not tax advice. Verify all rates and deductions with a qualified accountant before making payments.
The skill generates the text the user pastes into the HMRC CIS online portal. It does NOT call HMRC APIs and does NOT submit anything on the user's behalf.
When to Use
- Onboarding a new subbie before first payment
- Pre-payment check on an existing subbie (verification expires after 2 tax years of inactivity)
- Working out the deduction on an invoice that includes labour and materials
- Preparing the monthly CIS300 return
- Explaining CIS to a subbie or subcontractor firm
Workflow
Phase 1, gather inputs.
Ask the user for the following:
- Subcontractor legal name (company name or sole trader name)
- Trading name if different
- Unique Taxpayer Reference (UTR), 10 digits
- For sole traders: National Insurance number (NI)
- For companies: company registration number (CRN)
- For partnerships: partnership UTR plus any partner names/UTRs
- Payment amount on the invoice (gross, inclusive of VAT if applicable)
- Materials portion of the invoice (direct cost of materials supplied)
- VAT amount on the invoice (if VAT-registered subbie)
- CITB levy (if shown separately)
Phase 2, guide through HMRC online verification.
Produce a short paste-ready text block the user copies into the HMRC CIS online portal (https://www.tax.service.gov.uk/gg/sign-in?continue=/construction-industry-scheme-online). Include:
- Subbie name
- UTR
- NI or CRN (as applicable)
Instruct the user that HMRC will return a verification number and a rate (0%, 20%, or 30%). The user enters the verification number back into the skill to continue.
Phase 3, apply rate logic.
Refer to references/hmrc-cis-rules.md for the rate decision tree.
- 0% (Gross Payment Status): Subbie holds Gross Payment Status with HMRC. No deduction. Still verify; HMRC may return a different rate than expected if the subbie's status has changed.
- 20% (Standard Rate): Subbie is verified and registered for CIS. Deduct 20% from the labour portion.
- 30% (Higher Rate): Subbie is not verified, or not registered for CIS, or HMRC cannot confirm the details. Deduct 30% from the labour portion.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 9d ago First seen · 141 lines · 89 tokens per session scan A 333c67ccc725
cis-verification is a skill published in the GitHub repository Jody09-dotcom/constructionx-skills (1 stars, last pushed 4mo ago), licensed MIT. It adds 89 tokens to every session and 1,515 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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