MCP Tasks Extension

This repository contains the official Model Context Protocol Tasks extension (io.modelcontextprotocol/tasks), based on SEP-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 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 process. See MAINTAINERS.md for the list of maintainers specific to this repository.

Policies

This repository follows the Model Context Protocol project policies:

• Code of Conduct
• Contributing Guidelines
• Security Policy

License

This project is licensed under the Apache License 2.0. See LICENSE for details.