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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeDocsModel Context Protocol 22 Oct 2026
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Specification changedspecification/2026-07-28/index

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7171### Extensions
7272 
73Beyond the core protocol, MCP defines optional [extensions](/extensions/overview)
73Beyond the core protocol, MCP defines optional [extensions](/extensions/overview.md)
7474that add modular, specialized, or experimental functionality. Extensions
7575are always opt-in and require explicit support from both client and server, negotiated
7676during initialization. Notable extensions include:
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78* **[Tasks](/extensions/tasks/overview)**: Asynchronous execution of long-running
78* **[Tasks](/extensions/tasks/overview.md)**: Asynchronous execution of long-running
7979 operations, with polling, mid-flight input, and durable handles
80* **[Skills over MCP](/community/working-groups/skills-over-mcp)**: Rich, structured
80* **[Skills over MCP](/community/working-groups/skills-over-mcp.md)**: Rich, structured
8181 instructions for agent workflows, discovered and consumed through MCP
82* **[MCP Apps](/extensions/apps/overview)**: Interactive UI elements (charts, forms,
82* **[MCP Apps](/extensions/apps/overview.md)**: Interactive UI elements (charts, forms,
8383 video players) rendered inline within conversations
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8585## Security and Trust & Safety
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123123 
124124Explore the detailed specification for each protocol component:
125125 
126> **[Architecture](/specification/2026-07-28/architecture)**
126> **[Architecture](/specification/2026-07-28/architecture.md)**
127127 
128> **[Base Protocol](/specification/2026-07-28/basic)**
128> **[Base Protocol](/specification/2026-07-28/basic.md)**
129129 
130> **[Server Features](/specification/2026-07-28/server)**
130> **[Server Features](/specification/2026-07-28/server.md)**
131131 
132132> **[Client Features](/specification/2026-07-28/client)**
133133 
134> **[Contributing](/community/contributing)**
134> **[Contributing](/community/contributing.md)**
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