REFERENCE ARCHITECTURE 09 / 09

Charge for a legitimate machine-performed outcome.

Authentication, tool invocation, entitlements, metering, policy and settlement.

SYSTEM BOUNDARIES

Where responsibility changes.

01Authorized client

02Capability access

03Usage + policy

04Settlement + audit

Four design boundaries. The specific technology stack, data rights and operating model depend on the real environment.

DESIGN EXERCISE / FAILURE LAB

Choose a realistic failure condition to inspect a defensible response and the verification evidence it would require.

SELECT A FAILURE MODE

Scenario responses are authored reference examples and have not been measured in a customer environment.

RESPONSE CONTRACT01 / 02

Architecture response

HOW TO VERIFY

Quota-boundary, replay, rate-limit and invoice tests.

TRADE-OFF TO ACCEPT

MCP and tool calls are distribution protocols, not billing contracts by themselves.

BACK TO PRACTICE