ModelRefs / Tool Chain — Tool Pattern
Tool Chain — Tool Pattern
Compose multiple tools into a deterministic, declarative pipeline the model orchestrates step by step.
Overview
Declare a chain (search → fetch → summarize → write) where each step is a tool. The model is constrained to follow the chain unless it explicitly opts out.
When to use it: You need predictable multi-tool flows with clear data hand-off.
Pattern details
| Pattern class | workflow |
|---|---|
| Difficulty | advanced |
| Invocation mode | synchronous |
| Also known as | tool pipeline |
| Last reviewed | 2026-06-07 |
Known failure modes
- Type mismatch — Step N output does not match step N+1 input. Mitigation: Statically validate the chain at registration time.
When not to use it
- Building chains with implicit, unvalidated hand-off.
Continue your research
Use these connected ModelRefs sections to compare alternatives, inspect implementation paths, and review the evidence and governance boundaries relevant to Tool Chain — Tool Pattern.
Frequently asked questions
When should I use the Tool Chain tool pattern?
You need predictable multi-tool flows with clear data hand-off.
What are common failure modes of Tool Chain?
Type mismatch
Is Tool Chain production-ready?
Yes when paired with the safety controls and observability hooks documented on the pattern page.