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Phase 5: - agent/: model + system prompt + toolboxes composition; bounded tool-dispatch loop (default 10 steps); panic-proof tool execution; unknown-tool and duplicate-name handling; history continuation; step observers; partial results on ErrMaxSteps/errors (ADR-0012) - llm.SchemaFor[T]: strict-compatible JSON schemas from Go types (nullable pointers, description/enum tags, recursion rejected) - majordomo.Generate[T]: typed structured output with fence-stripping decode and model-naming errors - README agents/structured-output sections + matrix synced Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>