Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/epistemedeus/x402-url-extractornpx agentmods add skills/epistemedeus/x402-url-extractor/page-changeWrote 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/epistemedeus/x402-url-extractor/page-change)<a href="https://agentmods.dev/skills/epistemedeus/x402-url-extractor/page-change"><img src="https://agentmods.dev/badge/skills/epistemedeus/x402-url-extractor/page-change/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/epistemedeus/x402-url-extractor/page-change"><img src="https://agentmods.dev/badge/skills/epistemedeus/x402-url-extractor/page-change.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 | $0.00055 | $0.00899 |
| Opus 5 | $0.00028 | $0.00449 |
| Sonnet 5 | $0.00011 | $0.00180 |
| Haiku 4.5 | $0.00006 | $0.00090 |
Grade A, and why
page-change 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 3d 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 — 103 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Compare two delivered extract-batch artifacts
This skill compares two already delivered SameDayDesk POST /extract/batch
JSON files for caller-selected fields. It does not fetch URLs, sign, send
payment headers, retry, or schedule a second purchase.
If the caller still needs a first or second batch delivery, stop this recipe
and use the existing web-extract skill plus the public customer example for
unpaid preflight. Pay only with separate explicit customer approval of that
example. This skill is not payment-capable.
When to Use
- The caller already has two batch JSON artifacts (fixture, saved delivery, or other local files they supply).
- They want selected-field diffs, failed/missing rows, and coverage unknowns made explicit.
- Do not use this skill to browse live pages, construct a paid request, or fill gaps from a prior partial by buying again.
Prerequisites
Work from a full public repository checkout of
epistemedeus/x402-url-extractor, not a separately packed npm tarball:
cd examples/customer-x402
npm ci
Requires Node.js 22 or newer. Source-identity helpers live at the repository root. The comparison covers selected values in the supplied artifacts; it does not validate the full seller output schema or prove downstream business utility.
How to Run
Show fictional or local supplied artifacts first.
From examples/customer-x402 after npm ci:
npm run page-change -- job --job ./fixtures/page-change/customer-job/job.json
npm run page-change -- compare \
--before ./fixtures/page-change/customer-job/before.json \
--after ./fixtures/page-change/customer-job/after.json \
--fields title,description,headings \
--format text
The fixture pair is owner proof that selected-field before/after, failed
rows, missing rows, and coverage unknowns stay visible. It is not buyer
demand. charged: true is not useful output.
Two existing public client deliveries the caller already saved:
npm run page-change -- compare \
--before /path/to/first-delivery.json \
--after /path/to/second-delivery.json \
--fields title,description,headings \
--clock 2026-09-08T12:00:00.000Z \
--max-stale-ms 86400000
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.
- 3d ago First seen · 103 lines · 55 tokens per session scan A 24a197775f91
page-change is a skill published in the GitHub repository epistemedeus/x402-url-extractor (1 stars, last pushed today), licensed MIT. It adds 55 tokens to every session and 899 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 2026-09-09.
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