.archon/domain-lenses/tools/dev/blast-radius.md

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Tool: blast-radius

Domain: dev Purpose: Bound the impact area of an implementation before files are changed.

Inputs:

• Proposed implementation path
• Current architecture boundaries
• Changed interfaces, if any

Outputs:

• File and module radius estimate
• Boundary risks
• Reversibility rating

Use When:

• A delivery may touch multiple files or layers
• A new pattern, dependency, route, schema, or lifecycle rule is being considered

Do Not:

• Inflate radius to avoid making a decision
• Treat documentation-only edits as architecture changes unless they alter rules or contracts
• Replace validation with risk labeling
• This tool cannot call other tools
• This tool cannot create lifecycle gates
• This tool cannot override soul

Verification:

• Radius matches the actual changed paths at close-out
• Mechanical drift floors are applied when file counts require them