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Mocha Game Activities

Developers

Overview Add-ins Activities Tabs Manifest Submission Security

Shared activities for conversations

Mocha Game Activities are planned as reviewed two-person experiences launched from a conversation. The design borrows the useful parts of the MSN Messenger Activity SDK while avoiding legacy ActiveX trust.

Model

Concept	Mocha direction
Catalog entry	Name, description, launch URL, size, category, participant limits, and hidden/beta flag live in the manifest.
Side-by-side launch	Activities open from the conversation action pane and are paired with the same remote contact.
Activity channel	Small data packets are delivered through Mocha using explicit initialize/send/receive events.
Rate limits	Each activity declares a packet budget so games cannot flood the conversation channel.
Legacy shim	A developer-only `window.external.Channel` compatibility layer can help port old samples during testing.

Manifest preview

{ "type": "gameActivity", "label": "Tic Tac Toe", "activity": { "launchUrl": "activities/tictactoe/index.html", "width": 500, "height": 500, "location": "side", "minParticipants": 2, "maxParticipants": 2, "maxPacketRatePerMinute": 120, "channelApi": "MochaActivity/1.0" } }

Activity channel preview

mocha.activity.initialize(); mocha.activity.sendData("READY"); mocha.activity.onRemoteReady = function () { }; mocha.activity.onDataReceived = function (data) { }; mocha.activity.onRemoteClosed = function () { }; mocha.activity.onDataError = function (data, reason) { };

Developer preview: Activity packages are not installable from the public catalog yet. Start with prototypes, keep packets small, avoid external trackers, and submit early designs for review in the forums. Clean-room Tic Tac Toe and Western Duel samples are included in the project documentation under docs/addins/samples.