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Group Type

Interest Group

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Mission Statement

The Primitive Grouping Interest Group explores how MCP Primitives (Tools, Resources, Prompts, Tasks) might be organized, beyond the flat lists maintained by the protocol, and how such organization might benefit both MCP servers and clients. The group documents diverse requirements from clients, servers, and gateways, supports reference extensions of varied organization strategies, and feeds recommendations into the SEP process rather than picking a single canonical pattern early.

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Scope

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In Scope

  • Requirements gathering: documenting use cases and constraints
  • Pattern exploration: testing and evaluating various approaches
  • Proof of concepts: maintaining a shared repository of reference implementations and experimental findings

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Out of Scope

  • Approving spec changes: this IG does not have authority to approve protocol changes; recommendations flow through the SEP process
  • Implementation mandates: the group can document patterns but cannot require specific client or server behavior
  • Tool Annotations IG - annotation-based filtering and selection of primitives intersects with how primitives are organized and surfaced
  • Skills Over MCP WG - maintains the published Skills extension; skill discovery and progressive disclosure overlap with grouping
  • Registry WG - organizing MCP servers (beyond this group’s mandate) is evaluated here