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Architecture · Version 1.2.0 · Reviewed 2026-08-02

API Rate Limit Response Designer

Make a defensible decision about header design and retry guidance with evidence, explicit trade-offs, and a verification plan.

4 method steps 4 documented failure modes 4 diagnostic checks 7 quality gates

Designs limit headers, retry guidance, quota semantics, and client behavior so consumers can back off correctly.

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What this skill helps you do

  • Header design
  • Retry guidance
  • Quota semantics

How API Rate Limit Response Designer works

You provide

Requirements, constraints, and the current topology

It inspects

Critical path and failure boundaries for header design

It decides

A retry guidance decision with consequences recorded

You verify

Rollout stages with the signal that gates each one

What it checks first

API Rate Limit Response Designer designs limit headers, retry guidance, quota semantics, and client behavior so consumers can back off correctly. Use it when the work involves Header design, Retry guidance, Quota semantics.

  1. The quality attribute that actually constrains the design: latency, consistency, availability, cost, or compliance.
  2. The critical path and the number of network hops on it.
  3. Where state lives and who owns it, since ownership ambiguity becomes a correctness problem.
  4. The failure behavior of every dependency: fail open, fail closed, or degrade.

Failure modes it recognizes

  • Synchronous coupling making availability the product of all dependency availabilities.
  • A shared database creating hidden coupling between nominally independent services.
  • A component with no clear owner, so its failure has no defined response.
  • Distributed transactions attempted across services without a saga or compensation model.

Answers it will reject

  • Selecting a technology before establishing the constraint it is meant to satisfy.
  • Presenting a diagram as a design without the failure and data-consistency model.
  • Optimizing for a hypothetical future scale at the cost of present operability.

Decision rules it applies

  • Make the consistency requirement explicit per operation, not per system.
  • Prefer designs whose failure modes are understood over designs whose peak performance is higher.
  • Record the decision, the rejected alternatives, and the conditions that would reverse it.

Evidence it asks for

  • Quantify load, growth, and latency budget with arithmetic and stated assumptions.
  • Define the rollout stages and the signal that gates each one.
  • Name the reversal path for the decision.

The method inside

  1. Turn header design into explicit functional requirements and quality-attribute constraints.
  2. Model the critical path, state, trust, and failure boundaries that govern retry guidance.
  3. Compare viable designs for quota semantics against weighted constraints and operational ownership.
  4. Select a design with consequences, rollout stages, observability, and a reversible adoption path.

Deliverables

  • Header design assessment
  • Retry guidance decision and action plan
  • Quota semantics verification checklist

Evidence requirements

  • Functional and quality requirements
  • Scale, latency, consistency, cost, and compliance constraints
  • Current topology and alternatives considered

Quality gates

  • Every material claim traces to supplied evidence or is labeled as a hypothesis.
  • The response follows the declared deliverable contract.
  • No execution, access, measurement, or verification is invented.
  • Secrets and personal data are redacted rather than repeated.
  • The user receives a concrete independent verification step.
  • The relevant failure modes in this domain were considered rather than only the reported symptom.
  • No listed anti-pattern was recommended as a solution.

Example task

Input

Clients hammer us after hitting our rate limit because they do not know when to retry. What should the response contain?

Expected output

A 429 without Retry-After is an instruction to retry immediately, which is what you are seeing. Return Retry-After plus the limit, remaining, and reset headers, and make the values reflect the actual window rather than a fixed constant...

Boundaries and compatibility

Ideal for

  • Header design: produce a decision or artifact grounded in supplied evidence.
  • Retry guidance: produce a decision or artifact grounded in supplied evidence.
  • Quota semantics: produce a decision or artifact grounded in supplied evidence.

Out of scope

  • Producing a generic reference architecture without requirements
  • Hiding material trade-offs behind best-practice language

Agent compatibility

  • GitHub Copilot custom agents
  • Claude Agent Skills / SKILL.md
  • Any instruction-following chat model

Tool policy: Advisory by default. No tools are assumed. If the host provides tools, use read-only evidence gathering unless the user explicitly approves a scoped write or execution action.