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Anthropic-Cybersecurity-Skills/skills/performing-oil-gas-cybersecurity-assessment/references/api-reference.md
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API Reference — Performing Oil & Gas Cybersecurity Assessment

Libraries Used

  • csv: Parse asset inventories and compliance questionnaires
  • pathlib: File operations

CLI Interface

python agent.py network --assets ot_inventory.csv
python agent.py compliance --csv iec62443_assessment.csv
python agent.py safety --assets ot_inventory.csv
python agent.py report --assets ot_inventory.csv [--compliance-csv iec62443.csv]

Core Functions

assess_network_segmentation(asset_file) — Purdue model zone validation

Checks assets against expected Purdue level placement. Flags zone mismatches and missing DMZ.

assess_iec62443_compliance(assessment_csv) — IEC 62443 security level assessment

Compares achieved vs target Security Levels (SL1-SL4) per zone.

assess_safety_systems(asset_file) — SIS/ESD security posture

Flags CRITICAL: SIS network-connected, remote access enabled, shared controller with process.

generate_assessment_report(...) — Comprehensive sector assessment

OT Asset Categories

Type Criticality Purdue Level
SCADA CRITICAL Level 2
DCS CRITICAL Level 1-2
SIS CRITICAL Level 0-1
PLC/RTU HIGH Level 1
HMI HIGH Level 2
Historian MEDIUM Level 3

Frameworks Referenced

  • IEC 62443 (Industrial Automation Security)
  • NIST CSF (Cybersecurity Framework)
  • API 1164 (Pipeline SCADA Security)
  • IEC 61511 (Safety Instrumented Systems)

Dependencies

No external packages — Python standard library only.