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/activecampaign/postmark-skills/postmark-webhooksnpx skills add ActiveCampaign/postmark-skills --skill postmark-webhooksgit clone --depth 1 https://github.com/ActiveCampaign/postmark-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/activecampaign/postmark-skills/postmark-webhooks)<a href="https://agentmods.dev/skills/activecampaign/postmark-skills/postmark-webhooks"><img src="https://agentmods.dev/badge/skills/activecampaign/postmark-skills/postmark-webhooks.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 5.1 | $0.00042 | $0.01808 |
| Opus 5 | $0.00021 | $0.00904 |
| Sonnet 5 | $0.00008 | $0.00362 |
| Haiku 4.5 | $0.00004 | $0.00181 |
Grade A, and why
postmark-webhooks scanned grade A 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 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl "https://api.postmarkapp.com/webhooks" \ How it starts
The opening of the file, as written. The whole thing — 183 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Postmark Webhooks
Overview
Postmark webhooks deliver real-time event data to your endpoint via HTTP POST. Use webhooks to track what happens after you send an email.
| Event | Trigger | Common Use |
|---|---|---|
| Delivery | Email accepted by recipient server | Confirm delivery, update status |
| Bounce | Email rejected by recipient server | Clean lists, alert support |
| SpamComplaint | Recipient marked as spam | Remove from lists, investigate |
| Open | Recipient opened email (tracking pixel) | Engagement analytics |
| Click | Recipient clicked a tracked link | Engagement analytics, conversion tracking |
| SubscriptionChange | Recipient unsubscribed | Update preferences, comply with regulations |
Quick Start
- Create a webhook via API or Postmark dashboard (Server → Webhooks)
- Set your endpoint URL — must accept HTTP POST and return 200
- Select event triggers — choose which events to receive
- Handle payloads — parse the JSON body for each event type
- Respond with 200 — acknowledge receipt immediately
Webhook API
Endpoints
| Endpoint | Method | Description |
|---|---|---|
/webhooks |
GET |
List all webhooks for a message stream |
/webhooks/{webhookid} |
GET |
Get a specific webhook |
/webhooks |
POST |
Create a webhook |
/webhooks/{webhookid} |
PUT |
Update a webhook |
/webhooks/{webhookid} |
DELETE |
Delete a webhook |
Create a Webhook
const postmark = require('postmark');
const client = new postmark.ServerClient(process.env.POSTMARK_SERVER_TOKEN);
const webhook = await client.createWebhook({
Url: 'https://yourdomain.com/webhooks/postmark',
MessageStream: 'outbound',
HttpAuth: {
Username: 'webhook-user',
Password: 'webhook-secret'
},
HttpHeaders: [
{ Name: 'X-Custom-Header', Value: 'my-value' }
],
Triggers: {
Open: { Enabled: true, PostFirstOpenOnly: false },
Click: { Enabled: true },
Delivery: { Enabled: true },
Bounce: { Enabled: true, IncludeContent: true },
SpamComplaint: { Enabled: true, IncludeContent: true },
SubscriptionChange: { Enabled: true }
}
});
console.log('Webhook created:', webhook.ID);
What ships with it
5 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.
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 · 183 lines · 42 tokens per session scan A 12e8eb22ba41
postmark-webhooks is a skill published in the GitHub repository ActiveCampaign/postmark-skills (45 stars, last pushed 17d ago), licensed MIT. It adds 42 tokens to every session and 1,808 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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