defense-in-depth-validation

Validate at every layer data passes through to make bugs impossible. Use when invalid data causes failures deep in execution, requiring validation at multiple system layers.

1.42x

Quality

72%

Does it follow best practices?

Impact

100%

1.42x

Average score across 3 eval scenarios

Securityby

Passed

No known issues

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npx tessl skill review --optimize ./plugins/defense-in-depth-validation/skills/defense-in-depth-validation/SKILL.md

Evaluation results

100%

60%

Project Creation Service Hardening

Four-layer input validation

Criteria

Without context

With context

Entry: empty check

100%

Entry: existence check

100%

Entry: directory type check

100%

Business logic guard

100%

Environment guard: test detection

100%

Environment guard: path boundary

100%

Debug: stack trace captured

100%

Debug: context fields logged

100%

Distinct error messages

100%

Validation plan documents layers

100%

10%

CI Workspace Cleanup Tool Safety

Environment guards and debug instrumentation

Criteria

Without context

With context

Test env detection

100%

tmpdir boundary check

100%

Refusal outside tmpdir

100%

Error message identifies context

100%

Stack trace captured

100%

Directory logged

100%

cwd logged

100%

Debug before destructive op

100%

Path normalization

100%

Safety notes cover both mechanisms

100%

20%

Session Manager Bug: Tracing and Fixing Invalid Data Propagation

Data flow tracing and layer-bypass testing

Criteria

Without context

With context

Entry validation added

100%

Business logic validation added

100%

Distinct error messages per layer

100%

Layer bypass test present

100%

Entry layer test present

100%

Environment guard or debug instrumentation

100%

Data flow documents origin

100%

Data flow documents checkpoints

100%

No single-point fix

100%

Tests are independent

100%

Repository: secondsky/claude-skills
Commit: 90d6bd7

Evaluated: 30 days ago
Agent: Claude Code
Model: Claude Sonnet 4.6

Table of Contents

Project Creation Service Hardening CI Workspace Cleanup Tool Safety Session Manager Bug: Tracing and Fixing Invalid Data Propagation

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