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 carsxe/carsxe-claude-plugin --skill market-valuegit clone --depth 1 https://github.com/carsxe/carsxe-claude-pluginWrote 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/carsxe/carsxe-claude-plugin/market-value)<a href="https://agentmods.dev/skills/carsxe/carsxe-claude-plugin/market-value"><img src="https://agentmods.dev/badge/skills/carsxe/carsxe-claude-plugin/market-value/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/carsxe/carsxe-claude-plugin/market-value"><img src="https://agentmods.dev/badge/skills/carsxe/carsxe-claude-plugin/market-value.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 | $0.00049 | $0.00312 |
| Opus 5 | $0.00024 | $0.00156 |
| Sonnet 5 | $0.00010 | $0.00062 |
| Haiku 4.5 | $0.00005 | $0.00031 |
Grade A, and why
market-value 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.
What it actually says
When the user asks about a vehicle's price, worth, or market value and has a VIN:
- Ask if they want to provide optional parameters to refine the estimate:
state— US state code (e.g.,CA,TX) for regional pricingmileage— current mileage to adjust the valuecondition— vehicle condition:excellent,clean,average, orrough
- Call the CarsXE Market Value API:
AppendGET https://api.carsxe.com/v2/marketvalue?key={CARSXE_API_KEY}&vin={VIN}&source=claude_plugin&state=<STATE>,&mileage=<MILEAGE>, and/or&condition=<CONDITION>if provided. - Present the estimated market value clearly, including:
- Current value estimate
- Low / average / high range if available
- Historical trend if available
- Provide helpful context (e.g., whether the value is strong for its age/mileage if that info is available).
- If the API key is missing, tell the user to set the
CARSXE_API_KEYenvironment variable.
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 · 23 lines · 49 tokens per session scan A e0999ab99817
market-value is a skill published in the GitHub repository carsxe/carsxe-claude-plugin (2 stars, last pushed 2d ago), licensed MIT. It adds 49 tokens to every session and 312 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 2026-08-31.
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writing-style
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