Create a new webhook subscription for real-time events. WHEN TO USE: - Setting up real-time notifications for device events - Integrating with external systems - Monitoring ad playback and impressions AVAILABLE EVENTS: - device.online: When a device comes online - device.offline: When a device go...
Risk signalsAccepts URL/endpoint input (url) · Handles credentials or secrets (secret)
Part of the Trillboards DOOH Advertising server.
Free to start. No card required.
AI agents use create_webhook to create or modify resources in Trillboards DOOH Advertising. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call create_webhook repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Trillboards DOOH Advertising.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"create_webhook": {
"limits": [
{
"counter": "create_webhook_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Trillboards DOOH Advertising policy for all 74 tools.
These attack patterns abuse exactly the kind of access create_webhook gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Create a new webhook subscription for real-time events. WHEN TO USE: - Setting up real-time notifications for device events - Integrating with external systems - Monitoring ad playback and impressions AVAILABLE EVENTS: - device.online: When a device comes online - device.offline: When a device goes offline - impression.recorded: When an impression is logged - campaign.allocated: When a campaign is allocated to a device - payout.processed: When a payout is processed - programmatic.ad_started: When a programmatic ad begins playing - programmatic.ad_ended: When a programmatic ad finishes playing - programmatic.no_fill: When a programmatic ad request gets no fill - programmatic.error: When a programmatic ad request errors RETURNS: - webhook_id: Unique webhook identifier - url: The webhook endpoint URL - events: Subscribed events - secret: HMAC signing secret (if provided) - status: enabled/disabled EXAMPLE: User: "Set up a webhook for device status changes" create_webhook({ url: "https://api.mycompany.com/trillboards/webhooks", events: ["device.online", "device.offline", "programmatic.error"], secret: "my-signing-secret-123" }). It is categorised as a Write tool in the Trillboards DOOH Advertising MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Trillboards DOOH Advertising MCP server in PolicyLayer and add a rule for create_webhook: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Trillboards DOOH Advertising. Nothing to install.
create_webhook is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the create_webhook rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for create_webhook. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
create_webhook is provided by the Trillboards DOOH Advertising MCP server (https://api.trillboards.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 74 Trillboards DOOH Advertising tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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