Record a single ad impression from a device. WHEN TO USE: - Reporting that an ad was displayed on a device - Recording impression with detailed metadata - Single impression events (for batch, use batch_impressions) RETURNS: - success: Boolean indicating success - impression_id: Unique impression ...
Part of the Trillboards DOOH Advertising server.
Free to start. No card required.
AI agents call record_impression to retrieve information from Trillboards DOOH Advertising without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though record_impression only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"record_impression": {}
}
}See the full Trillboards DOOH Advertising policy for all 74 tools.
These attack patterns abuse exactly the kind of access record_impression gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Record a single ad impression from a device. WHEN TO USE: - Reporting that an ad was displayed on a device - Recording impression with detailed metadata - Single impression events (for batch, use batch_impressions) RETURNS: - success: Boolean indicating success - impression_id: Unique impression identifier - earnings: Earnings credited for this impression EXAMPLE: User: "Record an impression for ad 507f1f77bcf86cd799439011" record_impression({ fingerprint: "P_abc123", ad_id: "507f1f77bcf86cd799439011", duration_seconds: 15 }). It is categorised as a Read tool in the Trillboards DOOH Advertising MCP Server, which means it retrieves data without modifying state.
Register the Trillboards DOOH Advertising MCP server in PolicyLayer and add a rule for record_impression: 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.
record_impression is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the record_impression 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 record_impression. 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.
record_impression 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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