References: Agent Budget Policies and Session Limits

1. Circuit breaker design pattern - Wikipedia - The fault-tolerance pattern that this chapter adapts for agent budget enforcement; explains the structural argument for stop-don't-degrade rather than continue-on-error.

2. Rate limiting - Wikipedia - Coverage of throttling techniques (token bucket, leaky bucket) that inform the per-tool-call and per-session token-rate limits in this chapter.

3. Quota (project management) - Wikipedia - Background on budget allocation and enforcement that frames the per-engineer and per-PR budget policies covered here.

4. Site Reliability Engineering - Beyer, Jones, Petoff, Murphy (eds) - Google / O'Reilly - The chapters on overload and graceful degradation provide the operational vocabulary this chapter applies to runaway-agent scenarios.

5. Building Microservices (2nd Edition) - Sam Newman - O'Reilly - Chapters on resilience patterns including bulkheads and circuit breakers that translate to harness-level safety in agent systems.

6. Anthropic: Building Effective Agents - Anthropic - The engineering essay that defines the agent-vs-workflow distinction and includes recommendations on budget enforcement at the harness level.

7. Claude Code Settings and Hooks - Anthropic - Reference for the configuration mechanism that operationalizes per-session limits and budget hooks in Claude Code, the canonical example used in this chapter.

8. OpenAI Usage Limits - OpenAI - Reference for tier-based rate and spending limits that complement application-level budget policies described here.

9. Hystrix: Latency and Fault Tolerance - Netflix GitHub - Classic reference for circuit-breaker implementation with concrete configuration examples; the design vocabulary applies directly to agent-budget enforcement.

10. LangSmith Cost Tracking - LangChain - Reference for the production-observability platform that surfaces per-trace and per-session token spend, useful for the budget-audit-log material in this chapter.