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 kevinnft/ai-agent-skills --skill webhook-subscriptionsgit clone --depth 1 https://github.com/kevinnft/ai-agent-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/kevinnft/ai-agent-skills/webhook-subscriptions)<a href="https://agentmods.dev/skills/kevinnft/ai-agent-skills/webhook-subscriptions"><img src="https://agentmods.dev/badge/skills/kevinnft/ai-agent-skills/webhook-subscriptions/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/kevinnft/ai-agent-skills/webhook-subscriptions"><img src="https://agentmods.dev/badge/skills/kevinnft/ai-agent-skills/webhook-subscriptions.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 | $0.00013 | $0.01718 |
| Opus 5 | $0.00006 | $0.00859 |
| Sonnet 5 | $0.00003 | $0.00344 |
| Haiku 4.5 | $0.00001 | $0.00172 |
Grade A, and why
webhook-subscriptions 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 8d 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 http://localhost:8644/health This is a copy
92% identical to webhook-subscriptions — 69 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 209 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Webhook Subscriptions
Create dynamic webhook subscriptions so external services (GitHub, GitLab, Stripe, CI/CD, IoT sensors, monitoring tools) can trigger Hermes agent runs by POSTing events to a URL.
Setup (Required First)
The webhook platform must be enabled before subscriptions can be created. Check with:
hermes webhook list
If it says "Webhook platform is not enabled", set it up:
Option 1: Setup wizard
hermes gateway setup
Follow the prompts to enable webhooks, set the port, and set a global HMAC secret.
Option 2: Manual config
Add to ~/.hermes/config.yaml:
platforms:
webhook:
enabled: true
extra:
host: "0.0.0.0"
port: 8644
secret: "generate-a-strong-secret-here"
Option 3: Environment variables
Add to ~/.hermes/.env:
WEBHOOK_ENABLED=true
WEBHOOK_PORT=8644
WEBHOOK_SECRET=generate-a-strong-secret-here
After configuration, start (or restart) the gateway:
hermes gateway run
# Or if using systemd:
systemctl --user restart hermes-gateway
Verify it's running:
curl http://localhost:8644/health
Commands
All management is via the hermes webhook CLI command:
Create a subscription
hermes webhook subscribe <name> \
--prompt "Prompt template with {payload.fields}" \
--events "event1,event2" \
--description "What this does" \
--skills "skill1,skill2" \
--deliver telegram \
--deliver-chat-id "12345" \
--secret "optional-custom-secret"
Returns the webhook URL and HMAC secret. The user configures their service to POST to that URL.
List subscriptions
hermes webhook list
Remove a subscription
hermes webhook remove <name>
Test a subscription
hermes webhook test <name>
hermes webhook test <name> --payload '{"key": "value"}'
Prompt Templates
Prompts support {dot.notation} for accessing nested payload fields:
{issue.title}— GitHub issue title{pull_request.user.login}— PR author{data.object.amount}— Stripe payment amount{sensor.temperature}— IoT sensor reading
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.
- 8d ago First seen · 209 lines · 13 tokens per session scan A 8534544a5696
webhook-subscriptions is a skill published in the GitHub repository kevinnft/ai-agent-skills (14 stars, last pushed 1mo ago), licensed MIT. It adds 13 tokens to every session and 1,718 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). It is 92% identical to webhook-subscriptions, differing in 69 lines, and is treated as a copy.
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