fhir-api-client-security

FHIR API Client Security Skill

This skill provides security review guidelines for Canvas plugins that act as FHIR API clients. Use it to audit token management, scope usage, and patient-scoped authorization when your plugin calls Canvas FHIR APIs or external FHIR endpoints.

When to Use This Skill

Use this skill when:

• Plugin uses Http() to call FHIR APIs
• Plugin uses Canvas SDK data models (Patient.objects, etc.)
• Plugin implements SMART on FHIR integration
• Plugin has patient-facing features that access FHIR data
• Reviewing OAuth token scope declarations

Key Security Concerns

1. Token Scope - Request minimum necessary scopes (least privilege)
2. Patient-Scoped Tokens - Patient-facing apps MUST scope tokens to the specific patient
3. Token Storage - Tokens in secrets, never hardcoded
4. Token Leakage - Never log tokens or include in error messages

Security Checklist

Reference the fhir_client_context.txt file for detailed patterns including:

• OAuth authentication methods
• FHIR scope format and common scopes
• Patient-scoped token requirements
• Token storage best practices
• Common vulnerabilities and detection