[Specification] Standardize `mcp.json` Workspace Location

[mrchantey]

It seems that every agent has its own opinion about where the mcp.json should live, cluttering the workspace and becoming a chore to keep in sync.

Examples

• cursor: .cursor/mcp.json
• vscode: .vscode/mcp.json
• claude: .mcp.json

This will only get more difficult as the mcp.json grows in complexity, including the location in the spec would at least create a path for 'ecosystem friendly agents'.

[digitarald]

See also https://github.com/orgs/modelcontextprotocol/discussions/274

[connor4312]

And also https://github.com/modelcontextprotocol/modelcontextprotocol/issues/292

[jonathanhefner]

Closing in favor of https://github.com/modelcontextprotocol/modelcontextprotocol/issues/292.