Validates AKIS session tracker handles high-volume edge cases: deep nesting (depth 26+), rapid context switching, interrupt storms, corruption recovery, and state preservation across 200+ random operations. Based on test findings, implements 4 key improvements to enhance production resilience.

Test Coverage

Edge Case Suite (test-session-resilience.js)

• Session lifecycle: start → phases → complete
• Nested sessions with automatic parent tracking
• Interrupt handling and auto-resume
• Corruption recovery via backup files
• Concurrent session management
• 37 assertions, 100% pass rate

Stress Test Suite (stress-test-sessions.js)

• Randomized operations: start, phase transitions, interrupts, resume, complete
• Validates parent references, depth consistency, orphan detection
• Configurable volume (50-200+ ops), seeded random for reproducibility
• Tested depths 0-26 with 0% error rate

Advanced Scenarios (scenario-test-sessions.js)

• Rapid context switching (30 switches in 1.5s)
• Interrupt storms (cascading 6-deep)
• Non-linear resumption
• Massive parallel sessions (50+ simultaneous)
• Stack-based parent assignment validation

AKIS Improvements Implemented

Based on resilience testing insights, implemented 4 production-ready improvements:

1. Hard Depth Limit

• Configurable max nesting depth via AKIS_MAX_DEPTH env var (default: 10)
• Prevents runaway nesting discovered in stress tests (depth 26+)
• Throws error when limit exceeded

2. Validation on Load

• Automatic corruption detection with structure validation
• Auto-recovery from .backup file on corruption
• Graceful fallback to empty state

3. Stale Session Cleanup

• New archive-stale CLI command
• Archives sessions inactive >N hours (default: 1hr)
• Prevents memory bloat from forgotten sessions

4. Health Check API

• New health CLI command for integrity validation
• Checks: orphaned sessions, depth consistency, stale sessions
• Returns comprehensive status report

# Use new features
export AKIS_MAX_DEPTH=5
node .github/scripts/session-tracker.js health
node .github/scripts/session-tracker.js archive-stale 2

See .github/AKIS_IMPROVEMENTS.md for full details including 6 additional proposed enhancements.

Key Findings

Stack-based parent assignment: New sessions use most recent active session as parent, not current session after resume. By design for interrupt stacking.

// After resume, parent is last active (session-2), not current (session-1)
start("session-1")  // depth 0, active
start("session-2")  // depth 1, parent=session-1, active
resume(session-1)   // current=session-1, but session-2 still active
start("interrupt")  // parent=session-2 (last active), depth 2

Corruption recovery: Atomic writes + .backup files enable 100% recovery from corrupted state files.

Performance validated:

• 30 context switches in 1.5s
• 50 sessions created in 2.4s
• 200 operations with 0% error rate

Usage

# Run all test suites
./.github/scripts/run-all-session-tests.sh

# Individual suites
node .github/scripts/test-session-resilience.js
node .github/scripts/stress-test-sessions.js --operations=200 --seed=42
node .github/scripts/scenario-test-sessions.js

See SESSION_RESILIENCE_TEST_RESULTS.md for detailed analysis.

Custom agent used: _DevTeam
Orchestrates by delegating to specialists. Defines WHO and WHEN.

Custom agent used: _DevTeam
Orchestrates by delegating to specialists. Defines WHO and WHEN.

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