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Agent B - CLI/API Integration Layer Task Report

Date: 2025-11-16 Objective: Wire the backend session artifact service into CLI and programmatic APIs without altering UI components Status: COMPLETED

Summary

Successfully implemented a complete CLI/API integration layer for the Session Artifact Explorer feature. This layer provides programmatic access to session artifacts through both command-line interfaces and Python API functions, with comprehensive path sandboxing, error handling, and test coverage.

Deliverables

1. Backend Service Layer

File: src/session_artifact_service.py

A filesystem-backed service that provides safe, sandboxed access to processed session artifacts.

Key Features:

  • Path traversal protection (rejects .., absolute paths, escapes outside OUTPUT_DIR)
  • Automatic text file detection for previews
  • Session directory scanning with metadata extraction
  • Zip archive creation for session bundles
  • Comprehensive error handling and logging

Core API:

class SessionArtifactService:
    def list_sessions() -> List[SessionDirectorySummary]
    def list_directory(relative_path) -> List[ArtifactMetadata]
    def get_artifact_metadata(relative_path) -> ArtifactMetadata
    def get_text_preview(relative_path, max_bytes, encoding) -> ArtifactPreview
    def create_session_zip(relative_path, destination, compression) -> Path

2. API Integration Layer

File: src/api/session_artifacts.py

Wraps the backend service with JSON serialization and standardized response formats.

Key Features:

  • Consistent response format across all endpoints
  • Success/error/not_found/invalid status codes
  • ISO-8601 timestamps on all responses
  • Convenience wrapper functions for easy imports

Convenience Functions:

list_sessions_api() -> Dict[str, Any]
get_directory_tree_api(relative_path: str) -> Dict[str, Any]
get_artifact_metadata_api(relative_path: str) -> Dict[str, Any]
get_file_preview_api(relative_path: str, max_size_kb: int, encoding: str) -> Dict[str, Any]
download_file_api(relative_path: str) -> Optional[Tuple[Path, str]]
download_session_api(relative_path: str) -> Optional[Tuple[Path, str]]

3. CLI Commands

File: cli.py (modifications)

Added artifacts command group with three subcommands.

Commands:

python cli.py artifacts list

Lists all processed sessions sorted by modification time.

Options:

  • --limit, -n: Maximum number of sessions to show
  • --json: Output in JSON format

Output: Rich table with session name, file count, size, and modified timestamp

python cli.py artifacts tree <session_path>

Shows directory contents for a session.

Options:

  • --json: Output in JSON format

Output: Rich table with file name, type, size, and modified timestamp

python cli.py artifacts download <session_path>

Downloads a session as zip or a specific file.

Options:

  • --file, -f: Specific file to download (relative path within session)
  • --output, -o: Output path for download

Output: Downloaded file or zip archive

4. Test Suite

Files:

  • tests/test_cli_artifacts.py (CLI command tests)
  • tests/test_api_session_artifacts.py (API function tests)

Coverage:

  • CLI commands: list (empty, with data, limit, JSON), tree (exists, not exists, subdirs, JSON), download (session, file, not exists, custom path)
  • API functions: all convenience wrappers, path security, response format consistency
  • Security: path traversal blocking, absolute path rejection, sandbox enforcement

Test Metrics:

  • Total test cases: 40+
  • Coverage areas: CLI integration, API layer, path security, serialization, error handling

Interface Specifications

Response Format Standard

All API functions return responses following this schema:

{
  "status": "success" | "error" | "not_found" | "invalid",
  "data": <response-data> | null,
  "error": <error-message> | null,
  "timestamp": "ISO-8601-UTC-timestamp"
}

Payload Formats

List Sessions Response

{
  "status": "success",
  "data": {
    "sessions": [
      {
        "name": "20251115_184757_test_session",
        "relative_path": "20251115_184757_test_session",
        "file_count": 12,
        "total_size_bytes": 3145728,
        "created": "2025-11-15T18:47:57+00:00",
        "modified": "2025-11-15T20:31:45+00:00"
      }
    ],
    "count": 1
  },
  "error": null,
  "timestamp": "2025-11-16T12:00:00.000000"
}

Directory Tree Response

{
  "status": "success",
  "data": {
    "relative_path": "20251115_184757_test_session",
    "items": [
      {
        "name": "test_full.txt",
        "relative_path": "20251115_184757_test_session/test_full.txt",
        "artifact_type": "txt",
        "size_bytes": 313512,
        "created": "2025-11-16T03:11:22+00:00",
        "modified": "2025-11-16T03:11:22+00:00",
        "is_directory": false
      }
    ],
    "count": 1
  },
  "error": null,
  "timestamp": "2025-11-16T12:00:00.000000"
}

Artifact Metadata Response

{
  "status": "success",
  "data": {
    "name": "test_full.txt",
    "relative_path": "20251115_184757_test_session/test_full.txt",
    "artifact_type": "txt",
    "size_bytes": 313512,
    "created": "2025-11-16T03:11:22+00:00",
    "modified": "2025-11-16T03:11:22+00:00",
    "is_directory": false
  },
  "error": null,
  "timestamp": "2025-11-16T12:00:00.000000"
}

File Preview Response

{
  "status": "success",
  "data": {
    "relative_path": "20251115_184757_test_session/test_full.txt",
    "content": "Full transcript content...",
    "truncated": false,
    "encoding": "utf-8",
    "byte_length": 313512
  },
  "error": null,
  "timestamp": "2025-11-16T12:00:00.000000"
}

Error Response

{
  "status": "not_found",
  "data": null,
  "error": "Session not found: nonexistent_session",
  "timestamp": "2025-11-16T12:00:00.000000"
}

Security Considerations

Path Sandboxing

All file operations are sandboxed to the configured OUTPUT_DIR:

  1. Absolute Path Rejection: Paths like /etc/passwd or C:\Windows\System32 are rejected immediately
  2. Relative Path Validation: All paths are resolved and checked against OUTPUT_DIR boundaries
  3. Traversal Prevention: Attempts using ../ to escape are blocked by path resolution
  4. Logging: All path validation failures are logged for security auditing

Example Security Tests:

# These are all blocked:
api.get_directory_tree("../../../etc/passwd")  # -> not_found
api.get_file_preview("../../etc/passwd")       # -> not_found
api.download_file("/absolute/path/file.txt")   # -> invalid

Error Handling

  • Invalid Input: Returns status: "invalid" with descriptive message
  • Not Found: Returns status: "not_found" when resource doesn't exist
  • Server Errors: Returns status: "error" with logged exception details
  • Success: Returns status: "success" with populated data field

Usage Examples

Python API Usage

from src.api.session_artifacts import list_sessions_api, get_directory_tree_api

# Get all sessions
response = list_sessions_api()
if response['status'] == 'success':
    for session in response['data']['sessions']:
        print(f"{session['name']}: {session['file_count']} files")

# Get directory contents
session_id = "20251115_184757_test_session"
response = get_directory_tree_api(session_id)
if response['status'] == 'success':
    for item in response['data']['items']:
        print(f"  {item['name']} ({item['artifact_type']})")

CLI Usage

# List all sessions
python cli.py artifacts list

# Show top 5 most recent sessions
python cli.py artifacts list --limit 5

# View session contents
python cli.py artifacts tree 20251115_184757_test_session

# Download entire session as zip
python cli.py artifacts download 20251115_184757_test_session

# Download specific file
python cli.py artifacts download 20251115_184757_test_session \
  --file test_full.txt --output ./my_transcript.txt

# Get JSON output for scripting
python cli.py artifacts list --json | jq '.data.sessions[0].name'

Integration Points

Current Integration

  • CLI: Fully integrated via cli.py with artifacts command group
  • Python API: Importable from src.api.session_artifacts
  • Logging: All operations logged via src.logger
  • Audit Trail: CLI commands emit audit events when audit logging is enabled
  • Configuration: Uses Config.OUTPUT_DIR and Config.TEMP_DIR

Future Integration Opportunities

  1. Gradio UI: The existing src/ui/session_artifacts_tab.py could be updated to use this API layer instead of direct filesystem access
  2. REST API: Expose via Flask/FastAPI for remote access
  3. Background Worker: Use for async zip generation of large sessions
  4. Caching Layer: Add Redis/LRU cache for directory listings on large deployments

Known Limitations

  1. No Caching: Directory listings are computed on every request. For >1000 files, consider caching.
  2. Memory Streaming: Large files (>100MB) loaded into memory for zip creation. Consider chunked streaming.
  3. Single User: No authentication/authorization layer. Assumes desktop single-user context.
  4. Synchronous: All operations are synchronous. Large sessions may block during zip creation.

Testing & Validation

How to Run Tests

# Run all artifact tests
pytest tests/test_cli_artifacts.py tests/test_api_session_artifacts.py -v

# Run with coverage
pytest tests/test_cli_artifacts.py tests/test_api_session_artifacts.py --cov=src.api --cov=cli --cov-report=html

# Run specific test class
pytest tests/test_api_session_artifacts.py::TestPathSecurity -v

Manual Validation

# 1. List sessions
python cli.py artifacts list

# 2. Show tree for latest session (copy name from list output)
python cli.py artifacts tree <session_name>

# 3. Download a file
python cli.py artifacts download <session_name> --file <filename>

# 4. Download entire session
python cli.py artifacts download <session_name>

Documentation Updates

Updated docs/FEATURE_REQUEST_SESSION_ARTIFACT_EXPLORER.md with:

  • Complete CLI command reference
  • API function documentation with code examples
  • Response format specifications
  • Security considerations
  • Test coverage summary
  • Architecture overview
  • Known limitations and future work

Conclusion

The CLI/API Integration Layer is now complete and fully functional. All deliverables have been implemented, tested, and documented. The implementation provides a solid foundation for programmatic access to session artifacts with proper security, error handling, and extensibility.

Next Steps (for future agents):

  1. Update Gradio UI tab to use the new API layer
  2. Consider adding caching for large directory operations
  3. Explore async/background processing for zip creation
  4. Add pagination support for sessions with >1000 files

Files Created/Modified

Created:

  • src/session_artifact_service.py (301 lines) - Backend service layer (auto-reformatted by linter)
  • src/api/__init__.py - API module initialization
  • src/api/session_artifacts.py (338 lines) - API integration layer
  • tests/test_cli_artifacts.py (199 lines) - CLI command tests
  • tests/test_api_session_artifacts.py (374 lines) - API function tests
  • AGENT_B_CLI_API_TASK_REPORT.md (this file) - Task completion report

Modified:

  • cli.py (+233 lines) - Added artifacts command group
  • docs/FEATURE_REQUEST_SESSION_ARTIFACT_EXPLORER.md (+279 lines) - Added implementation documentation

Total Lines Added: ~1,724 lines of production code, tests, and documentation