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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

codex/skills/defense-in-depth/SKILL.md

@@ -1,6 +1,9 @@
 ---
 name: defense-in-depth
-description: "Defense in depth: add layered validation/guardrails across a data path (auth, validation, invariants, rate limits, idempotency). Triggers: defense in depth, guardrails, harden, 分层校验, 多道防线, 安全加固."
+description:
+  "Defense in depth: add layered validation/guardrails across a data path (auth,
+  validation, invariants, rate limits, idempotency). Triggers: defense in depth,
+  guardrails, harden, 分层校验, 多道防线, 安全加固."
 ---
 
 # Defense in Depth（分层校验 / 多道防线）
@@ -22,12 +25,10 @@ description: "Defense in depth: add layered validation/guardrails across a data
 ## Procedure（default）
 
 1. **Map the Path**
-
    - Identify trust boundaries and validation points
    - List invariants that must always hold
 
 2. **Layer Guardrails**
-
    - AuthN/AuthZ checks at boundaries (least privilege)
    - Input validation + normalization (reject early)
    - Business invariants (defensive checks with clear errors)
@@ -36,7 +37,6 @@ description: "Defense in depth: add layered validation/guardrails across a data
    - Observability (structured logs, metrics, alerts)
 
 3. **Failure Modes**
-
    - Define what happens on invalid input, partial failures, timeouts
    - Ensure errors are actionable and do not leak sensitive info