Ext Tasks

MCP Tasks Extension

This repository contains the official [Model Context Protocol](https://modelcontextprotocol.io) Tasks extension (`io.modelcontextprotocol/tasks`), based on [SEP-2663](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2663).

Overview

This extension defines the **Tasks** primitive for the Model Context Protocol (MCP). Tasks are durable state machines that carry information about the underlying execution state of a request, enabling requestor polling and deferred result retrieval. Each task is uniquely identifiable by a receiver-generated **task ID**.

Tasks are useful for:

• Representing expensive computations and batch processing requests
• Integrating seamlessly with external job/workflow APIs
• Enabling call-now, fetch-later execution patterns

**Extension Identifier:** `io.modelcontextprotocol/tasks`

Schemas

Version	Status	TypeScript	JSON Schema
2026-07-28	Stable	`schema.ts`	`schema.json`
draft	Development	`schema.ts`	`schema.json`

Released schema directories are immutable snapshots with version-specific JSON Schema identifiers. Development and schema generation target `schema/draft/` only. To create a release snapshot from the current draft:

npm run snapshot:schema -- YYYY-MM-DD

Development

Schema Generation

The draft JSON Schema is auto-generated from the TypeScript type definitions using [ts-to-zod](https://github.com/fabien0102/ts-to-zod) and Zod's `toJSONSchema()`. Do not hand-edit `schema.json` or `generated/schema.ts`.

# Generate draft Zod schemas and JSON Schema from schema.ts
npm run generate:schemas

# Verify TypeScript compiles and draft generated files are up to date
npm run check:schema

Governance

This repository follows the [Model Context Protocol Governance](https://modelcontextprotoc