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 Receiptor-AI/bookkeeping-skills --skill schedule-c-categoriesgit clone --depth 1 https://github.com/Receiptor-AI/bookkeeping-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/receiptor-ai/bookkeeping-skills/schedule-c-categories)<a href="https://agentmods.dev/skills/receiptor-ai/bookkeeping-skills/schedule-c-categories"><img src="https://agentmods.dev/badge/skills/receiptor-ai/bookkeeping-skills/schedule-c-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/receiptor-ai/bookkeeping-skills/schedule-c-categories"><img src="https://agentmods.dev/badge/skills/receiptor-ai/bookkeeping-skills/schedule-c-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 | $0.00089 | $0.03132 |
| Opus 5 | $0.00044 | $0.01566 |
| Sonnet 5 | $0.00018 | $0.00626 |
| Haiku 4.5 | $0.00009 | $0.00313 |
Grade A, and why
schedule-c-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 — 196 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Schedule C Expense Categories
The authoritative category reference for US small businesses filing Schedule C (Form 1040). Use this to determine which line an expense belongs on. S-Corps (Form 1120-S) and C-Corps (Form 1120) use different forms but similar categories.
Part III: Cost of Goods Sold (Lines 33–42)
Not an operating expense. COGS is reported separately and subtracted from revenue to calculate gross profit. Includes: raw materials, inventory purchases, direct labor for manufacturing, shipping to customers (if you're the seller), packaging materials.
Do NOT put SaaS tools, office supplies, or general business expenses here. COGS is only for costs directly tied to producing the goods you sell. If you're a service business with no physical product, you likely have no COGS.
Part II: Expenses (Lines 8–27a)
Line 8 — Advertising
Belongs here: Google Ads, Meta Ads, LinkedIn Ads, print ads, sponsorships, business cards, trade show booth fees, SEO services, PR agency fees, promotional merchandise, influencer payments for promotion, direct mail campaigns, billboard ads, podcast sponsorships.
Does NOT belong here: Website hosting (→ Line 27a Other), software tools used for marketing like HubSpot or Mailchimp (→ Line 27a Other), meals at networking events (→ Line 24b Meals).
Line 9 — Car and truck expenses
Belongs here: Gas, oil changes, tires, insurance, registration, lease payments — OR — the standard mileage rate (67¢/mile for 2024, check IRS annually). You pick one method per vehicle.
Method lock-in: If you use actual expenses in year 1 of a vehicle, you generally can't switch to standard mileage for that vehicle later. If you start with standard mileage, you can switch to actual (but depreciation becomes limited to straight-line). Best practice: start new vehicles on standard mileage to preserve flexibility.
Does NOT belong here: Parking and tolls on business trips (→ Line 24a Travel). Commuting from home to a regular office (never deductible — this is personal). Vehicle insurance and repairs if using the standard mileage rate (they're already built into the rate).
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 · 196 lines · 89 tokens per session scan A f234b10b95b2
schedule-c-categories is a skill published in the GitHub repository Receiptor-AI/bookkeeping-skills (4 stars, last pushed 3mo ago), licensed MIT. It adds 89 tokens to every session and 3,132 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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