Agent Manager v2.0: Implement Cache Integrity Validation

[rysweet]

Overview

Add integrity checking for cached repository data to ensure data consistency and security. This addresses feedback from PR #39 code review.

Current State

The Agent Manager implements caching for offline support and performance, but lacks integrity validation of cached data. This could lead to issues with corrupted or tampered cache data.

Proposed Enhancement

Implement comprehensive cache integrity validation using checksums and verification mechanisms.

Implementation Components

1. Checksum Generation

• SHA-256 checksums for all cached agents and repository metadata
• Manifest checksums for repository indexes and agent listings
• Timestamp-based validation for cache freshness verification

2. Integrity Verification

• Startup validation: Verify cache integrity on Agent Manager initialization
• On-demand validation: Check integrity before using cached data
• Periodic validation: Background integrity checks during idle time
• Installation validation: Verify integrity before agent installation

3. Corruption Handling

• Automatic repair: Re-download corrupted cached data
• Graceful degradation: Fall back to network mode if cache invalid
• User notification: Alert users to cache corruption issues
• Audit logging: Log integrity failures for security analysis

Technical Approach

Cache Structure Enhancement

.claude/agent-manager/cache/
├── agents/
│   ├── agent-data.json
│   ├── agent-data.json.sha256
│   └── integrity.manifest
├── repositories/
│   ├── repo-index.json
│   ├── repo-index.json.sha256
│   └── integrity.manifest
└── checksums/
    ├── cache-integrity.log
    └── validation-history.json

Validation Process

1. Calculate checksums for all cached files
2. Compare with stored checksums from integrity manifests
3. Validate timestamps against refresh policies
4. Report validation results with specific failure details
5. Trigger repair actions for corrupted data

Security Benefits

• Tamper Detection: Identify unauthorized modifications to cached data
• Corruption Prevention: Prevent use of corrupted cached agents
• Supply Chain Security: Verify integrity of downloaded agents
• Audit Trail: Track cache validation events for security review

Performance Considerations

• Incremental validation: Only validate changed files
• Background processing: Perform integrity checks without blocking operations
• Efficient checksums: Use streaming SHA-256 for large files
• Caching validation results: Avoid redundant checksum calculations

Configuration Options

cache:
  integrity:
    enabled: true
    algorithm: "sha256"
    validation_frequency: "startup,periodic"
    periodic_interval: "24h"
    corruption_handling: "auto_repair"
    max_repair_attempts: 3
    audit_logging: true

Acceptance Criteria

• SHA-256 checksum generation for all cached data
• Integrity validation on startup and on-demand
• Automatic corruption detection and repair
• Configuration options for validation behavior
• Audit logging for security events
• Performance optimization for large cache files
• Documentation for integrity validation features
• Tests covering all validation scenarios
• Backward compatibility with existing cache structure

Priority

Medium-High - Important for production security and reliability, but not blocking basic functionality.

Technical Notes

• Consider using platform-optimized checksum libraries for performance
• Implement progressive validation to avoid blocking startup
• Design cache migration strategy for existing installations
• Plan for future integration with digital signature verification

Related

• PR feat: Implement Agent Manager for External Repository Management #39: Agent Manager Implementation
• Issue Agent Manager v2.0: Implement Specific Error Codes for Programmatic Handling #40: Specific Error Codes (for integrity validation error reporting)
• Future: Digital signature verification for downloaded agents

Note: This issue was created by an AI agent on behalf of the repository owner.

[rysweet]

This issue has been migrated to the gadugi repository as issue #7: rysweet/gadugi#7

The gadugi repository is now the central location for managing Claude Code agents and their enhancements. Please follow the issue there for updates and implementation progress.

Note: This migration was performed by an AI agent on behalf of the repository owner.