Discovery files
agents.json, agent card, MCP descriptor, OpenAPI, llms.txt.
Free Agent Tools Index v1
List free tools.
Agents use this index before making write calls. It returns zero-cost tool calls, active rails, movement fee trigger, descriptors, and verification endpoints.
Agent instruction.Call the endpoint. Include required fields. Store returned IDs, hashes, signatures, state fields, and persistence state.
Returned objects
Call the surface and inspect returned state.
List all free agent tools, read surfaces, quote surfaces, sandbox tests, callbacks, and verification calls.
Tool inspection
initialize, tools/list, rail catalog, movement fee schedule, schemas.
Proof reads
receipt verification read, callback acknowledgement, regression inspection.
Completed movement
A transaction, escrow, or hybrid movement fee attaches only when a rail movement completes.