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 humanerd-drew/opencode-drewgent --skill webhook-subscriptionsgit clone --depth 1 https://github.com/humanerd-drew/opencode-drewgentWrote 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/humanerd-drew/opencode-drewgent/webhook-subscriptions)<a href="https://agentmods.dev/skills/humanerd-drew/opencode-drewgent/webhook-subscriptions"><img src="https://agentmods.dev/badge/skills/humanerd-drew/opencode-drewgent/webhook-subscriptions.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 | $0.00019 | $0.01598 |
| Opus 5 | $0.00010 | $0.00799 |
| Sonnet 5 | $0.00004 | $0.00320 |
| Haiku 4.5 | $0.00002 | $0.00160 |
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 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.
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 How it starts
The opening of the file, as written. The whole thing — 191 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 {{AGENT_NAME}} agent runs by POSTing events to a URL.
Setup (Required First)
The webhook platform must be enabled before subscriptions can be created. Check with:
{{AGENT_NAME_LOWER}} webhook list
If it says "Webhook platform is not enabled", set it up:
Option 1: Setup wizard
{{AGENT_NAME_LOWER}} gateway setup
Follow the prompts to enable webhooks, set the port, and set a global HMAC secret.
Option 2: Manual config
Add to ~/.{{AGENT_NAME_LOWER}}/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 ~/.{{AGENT_NAME_LOWER}}/.env:
WEBHOOK_ENABLED=true
WEBHOOK_PORT=8644
WEBHOOK_SECRET=generate-a-strong-secret-here
After configuration, start (or restart) the gateway:
{{AGENT_NAME_LOWER}} gateway run
# Or if using systemd:
systemctl --user restart {{AGENT_NAME_LOWER}}-gateway
Verify it's running:
curl http://localhost:8644/health
Commands
All management is via the {{AGENT_NAME_LOWER}} webhook` CLI command:
Create a subscription
{{AGENT_NAME_LOWER}} 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
{{AGENT_NAME_LOWER}} webhook list
Remove a subscription
{{AGENT_NAME_LOWER}} webhook remove <name>
Test a subscription
{{AGENT_NAME_LOWER}} webhook test <name>
{{AGENT_NAME_LOWER}} webhook test <name> --payload '{"key": "value"}'
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 · 191 lines · 19 tokens per session scan A c9c4f3dd9293
webhook-subscriptions is a skill published in the GitHub repository humanerd-drew/opencode-drewgent (2 stars, last pushed 1mo ago), licensed MIT. It adds 19 tokens to every session and 1,598 once invoked, about $0.0001 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 2026-09-03.
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