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🛡️ Sentinel: Add input length limits to Pydantic models#57

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sentinel/pydantic-length-constraints-15836834636865986217
May 24, 2026
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🛡️ Sentinel: Add input length limits to Pydantic models#57
amrabed merged 1 commit into
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sentinel/pydantic-length-constraints-15836834636865986217

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I have implemented a security enhancement by adding explicit length constraints to the Item Pydantic models in the GraphQL and Bedrock Agent templates.

🛡️ Sentinel: [MEDIUM] Add input length limits

  • 🚨 Severity: MEDIUM
  • 💡 Vulnerability: Lack of input length validation on string fields in public-facing or event-driven templates.
  • 🎯 Impact: Potential for Denial of Service (DoS) attacks via oversized payloads and inconsistent data integrity.
  • 🔧 Fix: Added min_length and max_length to id and name fields in templates/graphql/models.py and templates/agent/models.py, and max_length to description in templates/agent/models.py.
  • ✅ Verification:
    • Ran mise run lint (via uv run ruff) to ensure no regressions in code style.
    • Ran mise run test (via uv run pytest) for GraphQL and Agent templates; all 14 existing tests passed.
    • Verified the new constraints with temporary unit tests that confirmed ValidationError is raised for strings that are too short or too long.
    • Updated .jules/sentinel.md with the learning.

This change ensures all "standard" templates in the repository now follow the same security-by-default pattern for input validation.


PR created automatically by Jules for task 15836834636865986217 started by @amrabed

…templates

This change adds `min_length` and `max_length` constraints to string fields
in the Pydantic models for the GraphQL and Bedrock Agent templates.
These constraints mitigate Denial of Service (DoS) risks from oversized
payloads and ensure data integrity across all public-facing templates.

- templates/graphql/models.py: id (1-50), name (1-100)
- templates/agent/models.py: id (1-50), name (1-100), description (max 500)
- .jules/sentinel.md: documented the vulnerability and prevention pattern.
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👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

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@amrabed amrabed marked this pull request as ready for review May 24, 2026 11:10
@amrabed amrabed merged commit 48b79e6 into main May 24, 2026
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@amrabed amrabed deleted the sentinel/pydantic-length-constraints-15836834636865986217 branch May 24, 2026 11:10
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