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-house-cligit 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-cli)<a href="https://agentmods.dev/skills/aicayzer/companies-house-mcp/companies-house-cli"><img src="https://agentmods.dev/badge/skills/aicayzer/companies-house-mcp/companies-house-cli/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-cli"><img src="https://agentmods.dev/badge/skills/aicayzer/companies-house-mcp/companies-house-cli.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 | $0.00046 | $0.01253 |
| Opus 5 | $0.00023 | $0.00626 |
| Sonnet 5 | $0.00009 | $0.00251 |
| Haiku 4.5 | $0.00005 | $0.00125 |
Grade A, and why
companies-house-cli 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 — 131 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You have the ch CLI from the companies-house-cli package. Use it to read the UK Companies House public register from the terminal.
Run ch --help for the command list and ch <command> --help for one command's flags. That help is generated from the tools themselves, so prefer it over anything remembered.
Commands
ch search <query> Find companies by name
ch search-officers <query> Find officers by name across the register
ch profile <company-number> Read a company record
ch charges <company-number> List registered charges
ch insolvency <company-number> Read the insolvency record
ch registers <company-number> Show where statutory registers are held
ch exemptions <company-number> List disclosure exemptions
ch establishments <company-number> UK establishments of an overseas company
ch officers <company-number> List company officers
ch appointments <officer-id> List one officer's appointments
ch ownership <company-number> List persons with significant control
ch disqualifications <officer-id> Check the disqualified directors register
ch filings <company-number> Read filing history
ch filing <company-number> <transaction-id> Read one filing in detail
ch document <document-id> Download the document behind a filing
ch report <company-number> Read the main records in one call
ch check <company-number> Screen a company against the public register
ch network <officer-name> Map an officer's appointments across companies
ch serve Run the MCP server (stdio, or --http)
ch config <set-key|show|path|clear> Manage the saved API key
ch tools List the MCP tools this build exposes
Flags
| Flag | Effect |
|---|---|
--json |
The structured payload. Use for scripting and jq |
--md |
Markdown. Use for files and notes |
--key <key> |
Use a specific API key for one command |
--limit <n>, --start <n> |
Page size and offset, where the command supports paging |
--all |
Include resigned officers (ch officers) |
--category <cat> |
Filter filings (ch filings) |
--status, --type, --sic, --location |
Narrow a search (ch search) |
--id <officer-id> |
Use an officer id instead of a name (ch network) |
--info, --out <path>, --format <fmt> |
Inspect, save, or choose a format (ch document) |
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 · 131 lines · 46 tokens per session scan A 4986d4c6190a
companies-house-cli is a skill published in the GitHub repository aicayzer/companies-house-mcp (13 stars, last pushed 1mo ago), licensed MIT. It adds 46 tokens to every session and 1,253 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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