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Knowledge catalogChoose core direction and segmented content
Practice 49AdvancedSystem designAbout 18 minutes

Corresponding knowledge: Capability and status contracts for fallback models

How to ensure that tool calls and behaviors do not get out of control when the main model is restricted and then switched to the backup model?

Examine multi-model adaptation, capability matrices, failure classification, and degradation.

Learn corresponding knowledgeInterview questions · Answer independently →
model routingFallbackCurrent limiting

Knowledge content check2026-10-03 · Check the source of the original question2026-10-02

The knowledge corresponding to this exercise:

Capability and status contracts for fallback models · Principle explanation →
Knowledge unit directory

LEARN · PRACTICE · REFLECT

Knowledge exercises·Independent answers

My notes and review ↗

Principles and Solutions have been collapsed. Explain the core mechanism, boundaries and verification methods in your own words, and then compare them.

Answers and personal notes

Each modified commit will be kept as an independent history. Your level of mastery is up to you to evaluate yourself against the standards.

Explain in your own words first

The core principles, analysis, Q&A and migration cases have been closed. When you are ready, unfold it and compare it with the content to find any omissions.

Hands-on verificationComplete on demand · Suggestions15 minutes

Design routing tables for three failures Model 429, Invalid parameters, Tool submitted.

Expand acceptance requirements and checkpoints
  • Permanent errors without blind retries
  • Toggle not replaying write actions
  • There is a clear end state when the ability is not satisfied

Key inspections

  • Model interface compatibility does not mean capability compatibility
  • Keep executed facts and action IDs
  • Budget covers all retry paths