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 aicayzer/companies-house-mcp --skill companies-housegit clone --depth 1 https://github.com/aicayzer/companies-house-mcpWrote 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/aicayzer/companies-house-mcp/companies-house)<a href="https://agentmods.dev/skills/aicayzer/companies-house-mcp/companies-house"><img src="https://agentmods.dev/badge/skills/aicayzer/companies-house-mcp/companies-house/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/aicayzer/companies-house-mcp/companies-house"><img src="https://agentmods.dev/badge/skills/aicayzer/companies-house-mcp/companies-house.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 | $0.00033 | $0.03130 |
| Opus 5 | $0.00016 | $0.01565 |
| Sonnet 5 | $0.00007 | $0.00626 |
| Haiku 4.5 | $0.00003 | $0.00313 |
Grade A, and why
companies-house 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 12d 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 — 277 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You have access to the companies-house MCP server, which provides tools for querying the UK Companies House API. Use this skill to help users research UK companies, officers, ownership, and corporate history.
Workflow
Start broad, go deep:
-
Find the company — Use
search_companiesto get the company number. Numbers are eight characters, zero-padded (00445790). Scotland usesSC, Northern IrelandNI, LLPsOC, overseas companiesFC. Shorter all-digit numbers are padded automatically. -
Get the overview — Use
company_report. One call returns the profile, officers in post, PSCs, charges, recent filings and any insolvency record, plus a coverage section saying how much of each list it retrieved. Start here for most requests. -
Go deeper as needed:
- Ownership →
get_ownership - One officer's history →
get_appointmentswith the officer id - An officer across companies →
officer_network - What is on the register that a reviewer should look at →
due_diligence_check - Specific filings →
get_filingswith a category - Charge detail →
get_charges - The filed document itself →
download_filing_document
- Ownership →
Available Tools
| Tool | Use When |
|---|---|
search_companies |
Finding a company by name. Supports filters: status, type, SIC code, location, incorporation date. |
search_officers |
Finding a person across all companies. Returns officer IDs for deeper queries. |
get_company_profile |
Getting detailed profile for a known company number. |
get_officers |
Listing directors and secretaries. Returns officers in post by default; include_resigned: true for the full history. |
get_appointments |
Seeing all companies an officer is/was associated with. Needs officer ID. |
get_ownership |
PSCs — who owns/controls the company. Individual, corporate, and legal person PSCs. |
get_filings |
Filing history. Filter by category: accounts, officers, mortgage, capital, etc. |
get_charges |
Mortgages/debentures. Outstanding vs satisfied charges. |
get_insolvency |
Insolvency cases, practitioners, proceedings. |
company_report |
Recommended starting point. One call returns profile, officers in post, PSCs, charges, recent filings and insolvency, with a coverage statement. |
due_diligence_check |
Screening summary of the public register. Reports observations, the checks it ran, the checks it could not run, and what the register cannot establish. Not a verdict. |
officer_network |
Map all appointments for an officer. Takes name or officer ID. |
get_company_registers |
Where the company keeps its statutory registers. |
get_exemptions |
Company exemptions (rare). |
get_uk_establishments |
UK branches of overseas companies. |
get_officer_disqualifications |
Look up one officer id in the disqualified directors register. An empty result is not proof the person was never disqualified. |
get_filing_document |
Metadata for a specific filing (needs transaction ID from get_filings). |
download_filing_document |
Retrieve the filed document itself. Returns it as an attached resource; metadata_only inspects size and formats first. |
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.
- 12d ago First seen · 277 lines · 33 tokens per session scan A 52191e47c70d
companies-house is a skill published in the GitHub repository aicayzer/companies-house-mcp (13 stars, last pushed 1mo ago), licensed MIT. It adds 33 tokens to every session and 3,130 once invoked, about $0.0002 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 2026-08-30.
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