MCP Rust SDK – MCP Protocol Compliance Status

This document tracks the compliance of the Rust SDK with the MCP protocol for both client and server operations. Update this checklist as features are audited and validated.

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MCP Protocol Operations & SDK Compliance Checklist

1. Client-Side Operations

MCP Operation	SDK Method Signature (expected)	Status	Notes
initialize	initialize(&mut self, params: InitializeRequestParams) -> Result<InitializeResult>	✅ Compliant	Sends MCP-compliant envelope
resources/list	list_resources(&mut self, params: PaginatedRequestParams) -> Result<ListResourcesResult>	✅ Compliant	Now sends MCP-compliant envelope
tools/list	list_tools(&mut self, params: PaginatedRequestParams) -> Result<ListToolsResult>	✅ Compliant	Sends MCP-compliant envelope
tool/call	call_tool(&mut self, name: String, arguments: HashMap<String, String>) -> Result<ToolResult>	✅ Compliant	Type-safe struct-based protocol message construction
Notifications	...	⬜ Not audited
Resource Content	...	⬜ Not audited

2. Server-Side Operations

MCP Operation	SDK Handler Signature (expected)	Status	Notes
initialize	on_initialize(&self, handler: fn(params) -> InitializeResult)	✅ Compliant	MCP envelope, param parsing, and response verified
resources/list	on_list_resources(&self, handler: fn(params) -> ListResourcesResult)	✅ Compliant	Handler routing and response verified
tools/list	on_list_tools(&self, handler: fn(params) -> ListToolsResult)	✅ Compliant (stub)	MCP envelope, handler routing, returns empty list (stub)
tool/call	on_tool_call(&self, handler: fn(name, arguments) -> ToolResult)	✅ Compliant	Type-safe param deserialization, robust handler invocation
Notifications	...	⬜ Not audited
Resource Content	...	⬜ Not audited

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Legend

• ✅ Compliant: Audited and confirmed MCP-compliant
• ⬜ Not audited: Not yet reviewed for protocol compliance
• 🚧 In progress: Being refactored or tested

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Next Steps

• Audit and validate initialize (client and server)
• Audit and validate tools/list and tool/call
• Centralize message construction/parsing for all operations
• Update this README as each operation is validated

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Last updated: 2025-06-05