Privacy‑First Agent Marketplace Checklist for Founders

Start with a machine‑readable manifest so agent registries and crawlers can discover your product without scraping or guessing. Implement a /.well‑known/agent.json or ai-agent.json that advertises name, capabilities, auth type, endpoints, and input schema. Several standards and registries now treat these manifests as the primary discovery mechanism.

Add JSON‑LD Schema.org markup on representative pages (application, softwareApplication, API) to give agents a noun‑layer description of what your product does and what inputs it accepts. Validated, consistent JSON‑LD reduces hallucination and improves recommendation quality in agent marketplaces.

Agents will expect a provable trail that a human authorized an agent to act. Issue machine‑readable consent receipts every time a user authorizes agent access or a payment. Use a JSON format that records actor IDs, timestamp, scope/purposes, linked privacy policy, and a signature (JWS/JWT) so the receipt can be verified later.

Adopt existing consent receipt specifications (Kantara’s Consent Receipt and community MVCR variants) or a W3C‑compatible approach using signed verifiable credentials. The important parts are: persistent identifier for the consent, machine‑parseable scopes, a cryptographic signature, and a human‑readable summary for audit.

You don’t need a full privacy program on day one, but marketplaces and enterprise integrators will want a short, verifiable set of artifacts: a privacy notice with clear purpose and data categories, a record of where data is stored and processed, basic access/erasure controls, and a link to the consent receipts produced.

Make those artifacts fetchable and machine‑readable: a privacy.json or privacy manifest, links from your agent manifest to the privacy policy and the consent receipt verifier endpoint, and a basic Data Processing Addendum (DPA) template for business customers. Make the minimum claims concrete (e.g., 'we retain logs for X days in region Y') rather than vague promises.

Marketplaces increasingly treat cryptographic trust signals as high‑value. Publish signed manifests (JWS), consider issuing or obtaining W3C Verifiable Credentials (VCs) for organizational identity, and record changelogs or attestations for major capability changes. These signals let registries and other agents reason about authenticity and reduce the need for manual vetting.

For many builders a full DID/VC stack is overkill at launch; start by signing your agent.json with a key tied to your domain and publish key fingerprints in a standardized location. When ready, offer or accept VCs for third‑party attestations such as SOC‑like reports, security scans, or independent privacy assessments.

Design the consent flow for both humans and agents: short human‑readable summaries, machine‑parsable scope lists, and a single action that generates the consent receipt. Avoid burying scope details in long legalese; instead surface explicit toggleable scopes and a one‑click export or copy of the signed receipt.

Automate lifecycle events: revoke receipts on deauthorization, rotate keys for signed manifests, and emit events when retention or processing changes. This reduces marketplace friction and makes your app a repeatable, low‑surprise integration for agent ecosystems.