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 agentmods add skills/xsolla/xsolla-ai-kit/webhooks-implnpx skills add xsolla/xsolla-ai-kit --skill webhooks-implgit clone --depth 1 https://github.com/xsolla/xsolla-ai-kitWrote 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/xsolla/xsolla-ai-kit/webhooks-impl)<a href="https://agentmods.dev/skills/xsolla/xsolla-ai-kit/webhooks-impl"><img src="https://agentmods.dev/badge/skills/xsolla/xsolla-ai-kit/webhooks-impl.svg" alt="Measured on agentmods" 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 | $0.00151 | $0.01930 |
| Opus 5 | $0.00076 | $0.00965 |
| Sonnet 5 | $0.00030 | $0.00386 |
| Haiku 4.5 | $0.00015 | $0.00193 |
Grade A, and why
webhooks-impl 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 5d 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 — 160 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Status
This skill is a draft authored by the webhooks SME (@e.chernykh).
Detailed material lives in references/:
references/events-and-payloads.md— delivery modes, event types, payload JSON, refund codesreferences/signature-verification.md— SHA-1 algorithm + Node/PHP examplesreferences/handler-and-reliability.md— responses, idempotency, retries, IP allowlist, fulfillment (ask how goods are granted), full handlerreferences/testing.md— fixture replay vs live tunnel; whenpaymentvsorder_paidarrivesfixtures/— sampleuser_validation/order_paid/paymentbodies (+.raw.txt)
When to use
Use this skill when the developer wants to receive and process Xsolla webhooks on their own backend for a headless web shop (their storefront on the Xsolla catalog + Pay Station, without Site Builder). Trigger conditions:
- Implementing a webhook endpoint that grants items / currency after purchase
- Verifying the webhook signature or debugging
INVALID_SIGNATURE - Handling
user_validation,payment/order_paid,refund/order_canceled, or subscription events - Making webhook processing idempotent or handling retries correctly
- Reviewing an existing webhook handler before go-live
This skill covers handler implementation and how to test it. Enabling
webhooks + creating the secret in Publisher Account is a manual step in
Prerequisites below (not done by merchant-setup). Setting the live URL is
covered in references/testing.md.
Prerequisites
export XSOLLA_WEBHOOK_SECRET=<project webhook secret key> # server-side only, never client-side
export XSOLLA_ENV=sandbox # default; "production" for prod
Publisher Account — enable webhooks + secret (human)
The agent cannot create the secret in PA. Ask the developer to:
What ships with it
10 files 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.
- fixtures/order_paid.json 2.3 KB
- fixtures/order_paid.raw.txt 1.5 KB
- fixtures/payment.json 1.8 KB
- fixtures/payment.raw.txt 1.3 KB
- fixtures/user_validation.json 290 B
- fixtures/user_validation.raw.txt 229 B
- references/events-and-payloads.md 6.0 KB
- references/handler-and-reliability.md 7.5 KB
- references/signature-verification.md 2.4 KB
- references/testing.md 5.2 KB
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.
- 5d ago First seen · 160 lines · 151 tokens per session scan A 1c16ea6ce94f
webhooks-impl is a skill published in the GitHub repository xsolla/xsolla-ai-kit (3 stars, last pushed 16d ago), licensed MIT. It adds 151 tokens to every session and 1,930 once invoked, about $0.0008 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.
Other skills, from other repositories
nemoclaw-contributor-implement-issue
Implement an accepted NemoClaw GitHub issue in the current checkout. Use when a user asks to pick up an issue for implementation, implement or fix a named issue, or add the issue's tests. Confirm accepted scope, deliver the smallest independently valuable capability slice, and record validation and remaining gates…
amazon-reviews-api-skill
This skill helps users automatically extract Amazon product reviews via the Amazon Reviews API. Agent should proactively apply this skill when users express needs like getting reviews for Amazon product with ASIN B07TS6R1SF, analyzing customer feedback for a specific Amazon item, getting ratings and comments for a…
amazon-competitor-analyzer
Scrapes Amazon product data from ASINs using browseract.com automation API and performs surgical competitive analysis. Compares specifications, pricing, review quality, and visual strategies to identify competitor moats and vulnerabilities.
shopify-functions
Shopify Functions allow developers to customize the backend logic that powers parts of Shopify. Available APIs: Discount, Cart and Checkout Validation, Cart Transform, Pickup Point Delivery Option Generator, Delivery Customization, Fulfillment Constraints, Local Pickup Delivery Option Generator, Order Routing Location…
food-order
Reorder previous Foodora orders, preview cart contents, and track delivery ETA/status with ordercli. Use when the user wants to reorder food, check delivery status, or browse recent Foodora order history. Never confirm an order without explicit user approval.
asc-subscription-localization
Bulk-localize subscription, subscription-group, and in-app purchase display names across App Store locales using asc, including API 4.4.1 version-scoped v2 resources. Use when filling or updating subscription/IAP names and descriptions without App Store Connect UI work.