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/mateaix/mateclaw/webhook-subscriptionsnpx skills add mateaix/mateclaw --skill webhook-subscriptionsgit clone --depth 1 https://github.com/mateaix/mateclawWhat 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 | $0.00013 | $0.01680 |
| Opus 5 | $0.00006 | $0.00840 |
| Sonnet 5 | $0.00003 | $0.00336 |
| Haiku 4.5 | $0.00001 | $0.00168 |
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 2d 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 — 208 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 the agent agent runs by POSTing events to a URL.
Setup (Required First)
The webhook platform must be enabled before subscriptions can be created. Check with:
the agent webhook list
If it says "Webhook platform is not enabled", set it up:
Option 1: Setup wizard
the agent gateway setup
Follow the prompts to enable webhooks, set the port, and set a global HMAC secret.
Option 2: Manual config
Add to ~/.mateclaw/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 ~/.mateclaw/.env:
WEBHOOK_ENABLED=true
WEBHOOK_PORT=8644
WEBHOOK_SECRET=generate-a-strong-secret-here
After configuration, start (or restart) the gateway:
the agent gateway run
# Or if using systemd:
systemctl --user restart the agent-gateway
Verify it's running:
curl http://localhost:8644/health
Commands
All management is via the the agent webhook CLI command:
Create a subscription
the agent 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
the agent webhook list
Remove a subscription
the agent webhook remove <name>
Test a subscription
the agent webhook test <name>
the agent 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.
- 2d ago First seen · 208 lines · 13 tokens per session scan A dea6ebe710d7
webhook-subscriptions is a skill published in the GitHub repository mateaix/mateclaw (1,061 stars, last pushed 2d ago), licensed Apache-2.0. It adds 13 tokens to every session and 1,680 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 2026-08-30.
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