Twelve Permissions MCP Tools

Twelve Permissions exposes 6 tools. Each one has its own page with the configuration for every client that can run this server.

list_pieces Read-only

list pieces
get_piece Read-only

get piece
get_buy_transaction Read-only

get buy transaction
get_x402_info Read-only

get x402 info
verify_seal

verify seal
get_refusals Read-only

get refusals

This list was read from the server itself, by connecting to it and calling tools/list on 24 September 2026. It is what the server actually exposes, not what its listing claims.

Mutating and Read-only are read off each tool's name, not its schema — a hint, not a guarantee. The registry stores tool names only; connect the server for its live schemas.

Twelve Permissions MCP server