INDIVIDUAL MCP TOOL

get_piece

Get full metadata for one seal by id ("01".

twelvepermissions.comnone authenticationAvailability not checked

LIVE ENDPOINT

https://twelvepermissions.com/mcp

No auth detected

Connect to this endpoint to inspect the live schema for get_piece and invoke it with your own arguments.

{}

Inferred read-only · medium confidence · heuristic, not a guarantee.

No write-capable action terms were found; this is not proof that invocation has no side effects.

CONNECT WITH APPROVAL

Review this server and its permissions before adding it. Secret placeholders must be set locally.

Codex

~/.codex/config.toml

[mcp_servers.twelve-permissions]
url = "https://twelvepermissions.com/mcp"
enabled = true

Claude Code

.mcp.json

{
  "mcpServers": {
    "twelve-permissions": {
      "type": "http",
      "url": "https://twelvepermissions.com/mcp"
    }
  }
}

Claude Desktop

Settings → Connectors → Add custom connector

Name: twelve-permissions
Remote MCP URL: https://twelvepermissions.com/mcp

Add this remote URL as a custom connector in Claude Desktop. Availability depends on the user plan and workspace policy.

Cursor

.cursor/mcp.json

{
  "mcpServers": {
    "twelve-permissions": {
      "url": "https://twelvepermissions.com/mcp"
    }
  }
}

Visual Studio Code

.vscode/mcp.json

Add to Visual Studio Code

{
  "servers": {
    "twelve-permissions": {
      "type": "http",
      "url": "https://twelvepermissions.com/mcp"
    }
  }
}

Generic MCP

Client-specific MCP configuration

{
  "name": "twelve-permissions",
  "transport": "streamable-http",
  "url": "https://twelvepermissions.com/mcp"
}

MCP Inspector

Run the official MCP Inspector locally and enter the indexed Streamable HTTP endpoint.

list_pieces — List all Twelve Permissions seals: verifiable NFTs on XRP Ledger mainnet, each sealing a real human-to-AI authorization event.
get_buy_transaction — Construct the exact XRPL NFTokenAcceptOffer transaction to buy a seal, including the authorization-memo protocol your principal must approve.
get_x402_info — Pay with USDC over HTTP instead of XRP: the x402 purchase rail (Base).
verify_seal — Verify a seal from first principles: recomputes sha256 of the canonical event record server-side and compares to the published event hash.
get_refusals — The other half of the collection: the hash-chained ledger of the agent's standing constraints — what it will not do — including the erratum where it corrected an earlier, exaggerated version of its own record.