Borrowing it
Nothing to install: this file belongs to vanillagreencom/kendex. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/vanillagreencom/kendex/main/.agents/skills/price-handling/SKILL.mdgit clone --depth 1 https://github.com/vanillagreencom/kendexWrote 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/vanillagreencom/kendex/price-handling)<a href="https://agentmods.dev/skills/vanillagreencom/kendex/price-handling"><img src="https://agentmods.dev/badge/skills/vanillagreencom/kendex/price-handling/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/vanillagreencom/kendex/price-handling"><img src="https://agentmods.dev/badge/skills/vanillagreencom/kendex/price-handling.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 | $0.00021 | $0.01081 |
| Opus 5.5 | $0.00008 | $0.00432 |
| Sonnet 5.5 | $0.00004 | $0.00216 |
| Haiku 4.5 | $0.00002 | $0.00108 |
Grade C, and why
price-handling scanned grade C with 1 finding 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 21d 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.
Hidden instructionshighPrompt injection
Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.
<!-- kendex:project-instructions:start --> How it starts
The opening of the file, as written. The whole thing — 119 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Project Instructions
Problems with a kendex-owned skill go through kendex report; check ownership in the file first.
Price Handling Patterns
The price type is f64
IEEE 754 double precision. No fixed-point, no decimal types.
Use i64 fixed-point only for a matching engine (bit-exact required), a regulatory audit trail mandating reproducibility, or a settlement system with legal precision requirements. Hybrid: i64 on the execution hot path, f64 for display and analytics.
Never == on prices
use float_cmp::{approx_eq, F64Margin};
pub const PRICE_EPSILON: f64 = 1e-10; // sub-pipette tolerance
pub fn prices_equal(a: f64, b: f64) -> bool {
approx_eq!(f64, a, b, epsilon = PRICE_EPSILON, ulps = 4)
}
pub fn price_gte(a: f64, b: f64) -> bool { a > b || prices_equal(a, b) }
pub fn price_lte(a: f64, b: f64) -> bool { a < b || prices_equal(a, b) }
Round only at the boundaries
| Boundary | Rounding |
|---|---|
| Order submission (OrderRequest → broker API) | Round to tick, then validate alignment |
| Display formatting | Round to the symbol's display_decimals |
| Market data ingestion (ticks, bars, quotes) | Never. Preserve full feed precision |
| P&L calculation | Never. Use raw values |
pub fn round_to_tick(price: f64, tick_size: f64) -> f64 {
(price / tick_size).round() * tick_size
}
pub fn validate_tick_alignment(price: f64, tick_size: f64) -> bool {
prices_equal(price, round_to_tick(price, tick_size))
}
Order submission order: round to tick, validate alignment (on failure return an error, never re-round), then format for the broker API if it takes a string.
Format with the symbol's precision, never hardcoded decimals (EURUSD 5, AAPL 2, BTC 8):
format!("{:.1$}", price, symbol.display_decimals as usize)
Symbol metadata owns precision
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.
- 21d ago Changed · -1 lines e8cf2b6baeb1
- 1mo ago Changed · +6 lines scan A → C dd4e71aa958b
- 2mo ago First seen · 114 lines · 21 tokens per session scan A 449dcaf71ba3
price-handling is a skill published in the GitHub repository vanillagreencom/kendex (87 stars, last pushed yesterday), licensed MIT. It adds 21 tokens to every session and 1,081 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it C with 1 finding (hidden instructions). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other skills, from other repositories
prose-review
Review prose written for others (e.g., user-facing documentation, prompts for other LLMs, reports, plans, inline comments, docstrings) for local jargon leakage, orphaned references, missing grounding, and audience or genre mismatch. Always run on prose you produce or materially edit, except for routine conversational…
text-search
Search indexed text corpora with qmd. For indexed content, prefer qmd over grep.
rp
Always read this skill when the user mentions "rp" or "repoprompt", or before accessing a repository outside the current RepoPrompt workspace. Covers workspace discovery, binding, root verification, and workspace hygiene.
ckjia-shopping
A shopping search and price-comparison tool for Taobao, JD.com, Tmall, and Pinduoduo, with image-based product recognition. It requires the ckjia-shopping service and its access key to be enabled.
claude-md-improver
Audit and improve existing CLAUDE.md files across a repository. Use for a deliberate, repo-wide quality review—not to record learnings from the current session.
claude-md-revision
Record durable, project-specific learnings from the current session in CLAUDE.md, .claude.local.md, or AGENTS.md—not general documentation, session summaries, or repo-wide audits.