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 AlexTeplovCPA/it-contractors-skills --skill identifying-expense-categoriesgit clone --depth 1 https://github.com/AlexTeplovCPA/it-contractors-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/alexteplovcpa/it-contractors-skills/identifying-expense-categories)<a href="https://agentmods.dev/skills/alexteplovcpa/it-contractors-skills/identifying-expense-categories"><img src="https://agentmods.dev/badge/skills/alexteplovcpa/it-contractors-skills/identifying-expense-categories/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/alexteplovcpa/it-contractors-skills/identifying-expense-categories"><img src="https://agentmods.dev/badge/skills/alexteplovcpa/it-contractors-skills/identifying-expense-categories.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 | $0.00107 | $0.01421 |
| Opus 5 | $0.00053 | $0.00711 |
| Sonnet 5 | $0.00021 | $0.00284 |
| Haiku 4.5 | $0.00011 | $0.00142 |
Grade A, and why
identifying-expense-categories 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 — 174 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Identifying Expense Categories
Organize the user's expense universe before deeper T2125 field mapping begins.
Core Rules
- Organize expenses before trying to finalize field-level treatment.
- Group expenses by practical category first, not by guesswork about final deductibility.
- Separate likely routine expenses from possible capital items.
- Preserve uncertainty where support is incomplete or mixed.
- Identify missing or weak support that affects downstream review.
- Organize and flag, do not advise.
- Do not determine final deductibility.
- Do not determine final GST/HST treatment.
- Do not force every expense into a final T2125 line at this stage.
- Do not state that a category is definitely allowable.
- Do not finalize capital vs current treatment where uncertainty remains.
- Do not conclude that mixed-use items are fully business.
- Do not state that the user is ready to file.
- Use this phrase where relevant: "That is outside what this workflow covers. It is a question for a CPA before you file."
Inputs
Do not ask the user to share SIN, business number, account numbers, or client names. Use general descriptions and rounded amounts.
Accept any of:
- expense log or CSV
- bookkeeping export
- bank or card transaction summaries
- uploaded receipts
- screenshots
- user explanation in chat
- vendor/category spreadsheet
Minimum useful input:
- vendor or expense description
- amount
- date or approximate timing
- user explanation of what the expense was for
Read from the shared input schema where available: case_id, tax_year, engagement_mode, user_profile, facts.business_activity, facts.home_office, facts.vehicle_use, documents.expense_support, transactions.expense_items, review_state.
Workflow
1. Establish the expense context
Determine whether the file includes:
- routine operating expenses
- meals and entertainment
- travel
- home office related costs
- vehicle-related costs
- professional fees
- subcontractor or outside service costs
- one-time equipment or possible capital items
- other unclear or mixed expenses
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.
- 12d ago First seen · 174 lines · 107 tokens per session scan A cca4d7048f3a
identifying-expense-categories is a skill published in the GitHub repository AlexTeplovCPA/it-contractors-skills (2 stars, last pushed 2mo ago), licensed MIT. It adds 107 tokens to every session and 1,421 once invoked, about $0.0005 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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