A
AAO (Agentic Advertising Organization) — The public registry and compliance pipeline that decides which agents are real. Marketplace agents must appear in the AAO registry to be activated; v2 reads their compliance status (passing, pending, not-passing) live. The
registry is the source of truth, not a Scope3 allowlist.
AdCP (Ad Context Protocol) — The open protocol for agentic media buying
that the Interchange runs on. AdCP defines how participants discover, negotiate,
and execute (get_products, create_media_buy, get_media_buy_delivery). One
integration on AdCP reaches every counterparty. See
adcontextprotocol.org.
Advertiser — The top-level container for a buyer’s media. Owns a brand, a
default optimization mode, and linked sales-agent accounts; campaigns live
underneath it. See the Advertiser guide.
Audience — A target or suppress list attached to a campaign to shape who a
buy reaches. See the Signal guide.
B
Brand / Brand Reference — The brand identity behind an advertiser: name, assets, safety posture, and story. The brand reference is the structured form sellers and creative agents read. See the Brand Story guide.C
Campaign — A single coherent media plan owned by an advertiser: flight dates, budget, optimization goals, audiences, and creative requirements. Executing one produces media buys. See the Campaign guide. Composition vs Passthrough — Two ways the platform handles a buyer intent. Composition means Scope3 aggregates across multiple agents and optimizes between them (DECISIONED). Passthrough means the request flows straight to a
single sales agent on the buyer’s own credentials with no Scope3 optimization
layer (ROUTED).
Credentials (source) — A buyer’s registered account for one inventory
source, used where that source requires per-buyer authentication. Registered
via POST /sales-agents/{agentId}/accountCredentials. See the
Storefront guide.
D
DECISIONED vs ROUTED — The two campaign types, immutable after creation.DECISIONED campaigns let Scope3 allocate budget and optimize media buys across
agents. ROUTED campaigns pass through to a single sales agent on the
customer’s own credentials with no Scope3 optimization. See the
Campaign guide.
Delivery — The reported metrics that roll up per package — impressions,
spend, clicks — following the AdCP get_media_buy_delivery schema.
Demand Signal — An inbound expression of buyer interest a storefront can
shape its inventory and pricing around. See the
Storefront guide.
Discovery Session — A refinable product-search conversation a buyer runs
against sales agents. It produces ranked proposals the campaign selects from.
See the Discovery guide.
E
Event Source — A conversion-tracking source (pixel, server event) referenced by event-based optimization goals so the platform can optimize toward real outcomes. See the Campaign guide.F
Frequency Cap — A buyer-side limit on how often a person sees an ad, set on the campaign or advertiser and enforced by Scope3 across all publishers in the campaign — distinct from publisher-side caps in package overlays. Shape:{ "max_impressions": 5, "window": { "interval": 7, "unit": "days" } }.
I
Interchange — Scope3’s operated platform where buyer agents and seller storefronts transact on AdCP. AdCP is the protocol; the Interchange is how it runs at scale — adding trust, identity, billing, legal, and observability. Inventory Source — An AdCP-compatible agent wrapped by a storefront that handles product discovery and media-buy execution. A storefront can wrap several. See the Storefront guide.M
MCP (Model Context Protocol) — The tool-calling protocol an AI agent uses to drive the Interchange. v2 exposes three composite MCP tools —health,
ask_about_capability, api_call — rather than a tool per endpoint.
Media Buy — One AdCP transaction with one sales agent, spawned when a
campaign executes (one per agent). Not directly creatable; tuned through the
campaign update endpoint. See the Media Buys guide.
O
Operating Instructions — Versioned guidance that steers how a storefront responds to demand. Exactly one version is active at a time. See the Storefront guide.P
Pacing / Pacing Period — Pacing is how spend is spread over time (even,
asap, front_loaded). A pacing period is a labeled time window within the
flight with its own weight or budget; each product becomes one package per
period at execute. See the Pacing periods guide.
Package — One product for one pacing period inside a media buy, carrying its
own budget, pacing, bid price, and optimization goals. Spawned at execute. See
the Packages guide.
Planning Brief — The free-text intent a buyer attaches to a campaign (the
brief field) that steers discovery and auto-selection — e.g. “Premium video
for tech-savvy professionals.”
Property List — A named include/exclude set of domains, apps, or deals
applied to packages. Updating it propagates without a full re-execute. See the
Campaign guide.
Proposal — An offer a storefront returns in response to discovery —
products, pricing, and terms a buyer can select into a campaign. See the
Discovery guide.
S
Sales Agent — An AdCP-compatible seller endpoint that answers discovery and executes media buys.status (ACTIVE, PENDING, COMING_SOON) says whether
the agent is live; requiresAccount says whether this buyer must register
credentials before using it. These are independent.
Sandbox — The safe, non-production path every reasoning step has. Agents
declaring sandbox: true are exercised through sandbox endpoints; demo
reporting is one query parameter away (?demo=true). New skills land on sandbox
and graduate to production explicitly.
SESOFI (single-endpoint-single-object-full-intent) — The architectural
pattern keeping the surface coherent: each high-level intent maps to one
endpoint that accepts one object describing the full intent. It cuts agent
round-trips and eliminates partial-state bugs. See the
Philosophy primer.
Signal — A targeting or optimization input — audience, contextual, or
outcome — discovered from signal agents via AdCP capability discovery. See the
Signal guide.
Signal RAG — Retrieval-augmented matching that surfaces the most relevant
signals for a brief or audience instead of requiring an exact lookup. See the
Signal guide.
Storefront — The sales-agent surface a buyer connects to. Wraps one or more
inventory sources, a business profile, and operating instructions. One
storefront reaches every buyer agent on the Interchange. See the
Storefront guide.
Syndication — Distributing a storefront’s inventory so it reaches buyers
across the Interchange through a single registration rather than per-buyer
integrations.
T
Task (async) — A long-running operation the platform tracks asynchronously (~60s to Minutes-Days). The caller polls or listens for completion rather
than blocking — discovery, execution, and approvals can all run as tasks.
Test Cohort — A held-out or experimental group configured on a campaign so
the platform can measure incremental lift against a control. Configured as part
of the campaign’s full intent.