Preview allows you to expose specific tools from a web app to the assistant. Understand contracts, confirmation, permitting, and auditing.
Direct answer
WebMCP for Meta Ray-Ban Display web apps is in developer preview and allows the developer to define which application functions Meta AI can control per natural language request. The proposal is to perform tasks without using your hands, keeping the catalog of actions under the control of the application. This does not eliminate risks: each tool needs to have an unambiguous name and parameters, authorization by the user, confirmation for relevant effects, idempotence, limits and recording of results. The wizard must operate only within the published contract and fail explicitly when the intent is ambiguous.
Tools must be narrow
A specific action like querying order is safer and more testable than a generic function with application-wide access.
Authorization precedes execution
The model can interpret the request, but identity, scope, and permission need to be checked by the service for each relevant call.
Confirmation accompanies impact
Status reading can be immediate; submission, purchase, deletion or change must show target, consequence and option to cancel.
Idempotence prevents duplication
Voice, Network, and Replay can repeat a call. Idempotent keys and reconciliation prevent duplicate orders or records.
Nexus Reading
Design the catalog as a high-risk API: least privilege, closed schemas, useful logs, short responses, and adverse intent testing before actual use.
FAQ
What does WebMCP do?
Allows you to define functions and actions of a web app that Meta AI can trigger upon user request.
Does the wizard get full control of the website?
Should not. The proposal is for the developer to publish exactly the allowed actions.
Is the resource already stable for broad production?
Meta classifies it as developer preview; Availability and contract may change.
Essential guides to delve deeper into the decision
This editorial analysis was produced by Nexus from the official sources below, consulted on September 30, 2026. The text is original and interprets practical implications for companies.
- Meta — AI glasses developer recap: presentation of WebMCP and the control of web app actions by Meta AI.
- Meta — Wearables FAQ: developer preview status, web apps context and official WebMCP definition.
Date reported by main source: September 24, 2026; developer preview.