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Trillboards DOOH Advertising

by io.github.snehdhruv
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verify_proof_of_play

Verify cryptographic proof of ad delivery or get campaign proofs.

Requires either campaign_id or proof_payload (at least one must be provided).

Two modes:

  1. Verify a proof: pass proof_payload with signature fields to verify

  2. Get proofs: pass campaign_id to get Ed25519-signed proofs for a campaign

Uses Ed25519 signatures (v2) that can be independently verified by third parties using the Trillboards public key.

WHEN TO USE:

  • Verifying that ads were actually delivered to screens

  • Exporting cryptographically signed proof records for auditors

  • Getting proof-of-play data for campaign transparency reports

RETURNS (verify mode):

  • valid: boolean, reason: string if invalid, version: 'v1' or 'v2'

RETURNS (get proofs mode):

  • campaignId, totalImpressions, proofsReturned

  • proofs: Array of signed impression proofs

  • pagination: { limit, hasMore, nextCursor }

  • signatureVersion, publicKeyUrl

EXAMPLE (verify): verify_proof_of_play({ proof_payload: { signature: "ed25519=abc123...", timestamp: "2026-03-10T15:30:00Z", adId: "ad_123", impressionId: "imp_456", screenId: "scr_789", deviceId: "dev_012" } })

EXAMPLE (get proofs): verify_proof_of_play({ campaign_id: "camp_abc123", start_date: "2026-03-01", end_date: "2026-03-10" })

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
limitNoMax proofs to return (default: 1000, used with campaign_id)
cursorNoPagination cursor from previous response (used with campaign_id)
end_dateNoEnd date for proof query (YYYY-MM-DD, used with campaign_id)
start_dateNoStart date for proof query (YYYY-MM-DD, used with campaign_id)
campaign_idNoCampaign ID to get proofs for (mutually exclusive with proof_payload)
proof_payloadNoProof data to verify (mutually exclusive with campaign_id). Must include: signature, timestamp, adId, impressionId, screenId, deviceId

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed9 schema fields changed
    • addedInput schema / properties / campaign_id / description
      Added value: +"Campaign ID to get proofs for (mutually exclusive with proof_payload)"
    • addedInput schema / properties / cursor / description
      Added value: +"Pagination cursor from previous response (used with campaign_id)"
    • addedInput schema / properties / end_date / description
      Added value: +"End date for proof query (YYYY-MM-DD, used with campaign_id)"
    • addedInput schema / properties / limit / description
      Added value: +"Max proofs to return (default: 1000, used with campaign_id)"
    • addedInput schema / properties / proof_payload / description
      Added value: +"Proof data to verify (mutually exclusive with campaign_id). Must include: signature, timestamp, adId, impressionId, screenId, deviceId"
    • addedInput schema / properties / proof_payload / properties / signature / description
      Added value: +"Signature string (ed25519=... or sha256=...)"
    • addedInput schema / properties / proof_payload / properties / signatureVersion / description
      Added value: +"v1 or v2"
    • addedInput schema / properties / proof_payload / properties / timestamp / description
      Added value: +"ISO 8601 timestamp"
    • addedInput schema / properties / start_date / description
      Added value: +"Start date for proof query (YYYY-MM-DD, used with campaign_id)"
  2. First observed

TDQS

A5/5.0
Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, but the description compensates by explaining cryptographic details (Ed25519 v2), third-party verifiability, expected return structures for both modes, and pagination behavior. It also documents the version distinction (v1/v2) and public key URL, offering deep insight beyond the schema.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is well-structured with clear headings, bullet lists, and two concrete examples. Though lengthy, every section contributes necessary information for correct invocation, and the organization makes it easy to scan. No redundant language or filler.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a tool with six parameters, nested objects, two distinct modes, and no output schema, the description is exceptionally complete. It covers required inputs, return values, pagination, signature versions, and provides examples for both operation modes, ensuring the agent can invoke it correctly without additional context.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters5/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Despite 100% schema description coverage, the description adds considerable value by clarifying mode-specific parameter usage, explaining that proof_payload requires specific fields, and providing full JSON examples for both modes. It also explains pagination parameters and their context, going far beyond the bare schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description opens with a specific verb and resource: 'Verify cryptographic proof of ad delivery or get campaign proofs.' It clearly distinguishes two modes (verify vs. get proofs) and uses unambiguous terminology, making its purpose unmistakable and distinct from other tools.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description includes a dedicated 'WHEN TO USE' section listing concrete use cases, and explicitly states the mutual exclusivity of campaign_id and proof_payload. It also clarifies which mode applies based on input, providing strong guidance for tool selection.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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