[Meta] Protocol Reliability Roadmap - Failure Handling & Testing

[EricSanchezok]

Overview

Meta-issue tracking AWCP protocol reliability improvements. Consolidates findings from systematic failure analysis.

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Failure Scenarios Summary

Category	Identified	Handled	Gap
Network Failures	17	5	12
Transport Failures	18	8	10
SSE/Streaming	8	4	4
State Machine	12	10	2
Resource Cleanup	9	5	4
Total	64	32	32

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Critical Issues (P0)

1. Storage transport data loss - Result deleted before upload confirmed ([Bug] Resource cleanup failures in transport implementations #8)
2. No SSE timeout - Delegator waits forever if events stop ([Enhancement] Add SSE heartbeat and timeout mechanisms #9)
3. No heartbeat - Silent connection drops undetected ([Enhancement] Add SSE heartbeat and timeout mechanisms #9)
4. No network retry - Transient failures cause permanent failure ([Enhancement] Add retry mechanisms for transient network failures #12)
5. Missing timeouts - Operations can hang indefinitely ([Enhancement] Add timeout configuration for all transport operations #11)

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Related Issues

Bug Fixes

• [Bug] Resource cleanup failures in transport implementations #8 - Resource cleanup failures in transports

Enhancements

• [Enhancement] Add SSE heartbeat and timeout mechanisms #9 - SSE heartbeat and timeout
• [Enhancement] Add comprehensive failure testing infrastructure #10 - Failure testing infrastructure
• [Enhancement] Add timeout configuration for all transport operations #11 - Timeout configuration
• [Enhancement] Add retry mechanisms for transient network failures #12 - Retry mechanisms

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Implementation Order

#8 (Bug fixes) - CRITICAL, do first
    ↓
#11 (Timeouts) 
    ↓
#12 (Retries) - depends on #11
    ↓
#9 (SSE improvements)
    ↓
#10 (Testing) - can run in parallel

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Success Criteria

• No data loss scenarios
• Automatic recovery from transient failures
• Hung delegation detection < 2 minutes
• 80%+ test coverage on error paths