Choose a tool and supply structured arguments.
MCP and agent tools
Let agents act without deciding everything.
Expose progressively disclosed document operations while keeping deterministic execution, policy boundaries, and human judgment explicit.
material decisions stay namedValidate, run, enforce policy, and issue evidence.
Resolve the exception against the exact artifact.
Invocation contract
The model chooses intent. Runstamp controls execution. People own material decisions.
{ lossPolicy, signal, context }{ ok, value, losses, diagnostics, receipt }Runtime sequence
Discover, invoke, resolve.
The calling surface changes; the operation name and result semantics do not.
- 01
Discover descriptors
Expose the smallest relevant operation set for the current task.
tools/list - 02
Call a bounded tool
Validate the payload and execute through the registered contract.
tools/call - 03
Route uncertainty
Return exact issues to a person or host workflow instead of improvising.
review
Availability
Claims follow the registry.
Agent tools only expose operations whose underlying registry state permits the selected surface.
Inspect current capability evidence