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lnget Security Model for AI Agents

Trust Model

All CLI inputs are treated as potentially adversarial. The CLI validates resource IDs, file paths, URLs, and payloads before acting on them.

What lnget Can Do

  • Make HTTP requests to arbitrary http/https URLs
  • Pay Lightning invoices up to --max-cost satoshis (default: 1000)
  • Write files to specified output paths (validated against traversal)
  • Cache L402 tokens per-domain at ~/.lnget/tokens/<domain>/
  • Log payment events to ~/.lnget/events.db

Trust Boundaries

Payment Safety

  • --max-cost caps automatic payments (default: 1000 sats)
  • --max-fee caps routing fees (default: 10 sats)
  • --dry-run previews payments without spending
  • --no-pay disables automatic payment entirely

Input Validation

  • URLs must be http/https (no file:/javascript:/data:)
  • URLs must not contain embedded credentials
  • Domain arguments reject path separators, traversals, shell metacharacters
  • Output paths reject writes to sensitive directories (.ssh, .gnupg, .aws)
  • Control characters (< 0x20) are rejected in all string inputs

Interactive Safety

  • Destructive commands (tokens clear) require --force in non-TTY mode
  • No interactive prompts when stdout is not a TTY
  • Progress bars and human messages go to stderr, not stdout

Response Sanitization

Responses from L402-protected servers are returned as-is. If you are processing response content that may contain adversarial text (prompt injection), sanitize it before including in agent context.

MCP Surface

The lnget mcp serve command exposes all CLI functionality as typed MCP tools over stdio JSON-RPC. The MCP server applies the same input validation as the CLI. See lnget schema --all for the full tool inventory.