Tool Integration Contracts

The chapters in this module, in reading order.

#	Chapter
00	Tool integration contracts — First-principles overview
01	A tool is not a function. It is a production API boundary.
02	Contract anatomy: the six fields, and what each one prevents
03	The four authority classes
04	Idempotency and retry safety
05	Error contracts the model can recover from
06	Scopes and credential isolation
07	Validation: preconditions, postconditions, and dry-runs
08	Versioning and deprecation
09	Integration drift detection
10	Contract testing
11	Observability and audit
12	Architect checklist
13	Honest admission