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 carta/plugins --skill carta-hmrc-limitsgit clone --depth 1 https://github.com/carta/pluginsWrote 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/carta/plugins/carta-hmrc-limits)<a href="https://agentmods.dev/skills/carta/plugins/carta-hmrc-limits"><img src="https://agentmods.dev/badge/skills/carta/plugins/carta-hmrc-limits/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/carta/plugins/carta-hmrc-limits"><img src="https://agentmods.dev/badge/skills/carta/plugins/carta-hmrc-limits.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 | $0.00068 | $0.01516 |
| Opus 5 | $0.00034 | $0.00758 |
| Sonnet 5 | $0.00014 | $0.00303 |
| Haiku 4.5 | $0.00007 | $0.00152 |
Grade A, and why
carta-hmrc-limits 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 2d 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.
HMRC EMI/CSOP Limits
Report how much of a UK company's HMRC share-scheme allowances its outstanding grants use — at company level and per option holder.
When to Use
- "How much of our EMI limit have we used?"
- "How much EMI allowance is left?"
- "Are we close to the £6 million EMI limit?"
- "Who is near their individual limit?"
- "Is anyone over the £250k EMI/CSOP limit?"
- "How much CSOP headroom does Priya have?"
- "Can we grant another £50k of EMI options?"
UK companies only. A company without UK share schemes has nothing to report here.
Prerequisites
You need the corporation_id. Get it from list_accounts if you do not have it.
Data Retrieval
Company-level allowance:
call_tool({"name": "uk_compliance__get__hmrc_limits",
"arguments": {"corporation_id": corporation_id}})
Per-holder breakdown:
call_tool({"name": "uk_compliance__list__hmrc_stakeholder_limits",
"arguments": {"corporation_id": corporation_id}})
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.
- 2d ago First seen · 131 lines · 68 tokens per session scan A 49fdecd8cb10
carta-hmrc-limits is a skill published in the GitHub repository carta/plugins (13 stars, last pushed today), licensed Apache-2.0. It adds 68 tokens to every session and 1,516 once invoked, about $0.0003 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 2026-09-10.
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