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From xcindex
Compute the dependency blast radius of a Swift or Objective-C file — direct dependents, one hop of transitive callers, and covering tests — from Xcode's pre-built index. Use this when planning a refactor, scoping a structural change, or sizing the impact of editing a shared file, before reading anything.
How this skill is triggered — by the user, by Claude, or both
Slash command
/xcindex:swift-blast-radiusWhen to use
Trigger on phrasing like "what does this file affect", "what depends on AuthService.swift", "what will break if I change this", "what tests cover this code", "blast radius of NetworkClient.swift", "scope this refactor", "how big a change is this", "is it safe to edit X". Reach for this skill BEFORE editing any shared utility, service, manager, or model file, and BEFORE starting any non-trivial refactor — the result tells you the minimal set of files you actually need to read. For broader scoping that includes risks and a recommended execution path, use swift-refactor-plan. For symbol-level (not file-level) impact, use swift-find-references. Skip when the file is an obvious leaf (a specific View or ViewModel with no callers) or the index is stale.
The summary Claude sees in its skill listing — used to decide when to auto-load this skill
Given a file path, returns three sets:
Given a file path, returns three sets:
directDependents — files that directly call symbols defined in the target.affectedFiles — directDependents plus one hop of transitive callers.coveringTests — test files within the affected set.This replaces "read 20 files to understand the codebase before editing." The index already knows.
blast_radius with the absolute file path.directDependents plus
coveringTests. Skip affectedFiles unless you're doing something deep.directDependents, run
coveringTests.affectedFiles as a risk surface, not a reading list — it's where
regressions might surface, not where edits happen.BAD: Read 20 files to "understand the codebase" before editing NetworkClient.swift
GOOD: blast_radius("NetworkClient.swift")
→ directDependents: [APIService.swift, AuthManager.swift]
→ coveringTests: [NetworkClientTests.swift]
Read only those 3. Save 17 file reads.
User: "I need to refactor ModelData.swift. What do I need to read first?"
blast_radius(filePath: "/abs/path/ModelData.swift")swift-find-references.blast_radius will just confirm that, but it's not the cheapest path.npx claudepluginhub drewalth/claude-xcindex --plugin xcindexSearches MemPalace before answering questions about past work, people, projects, or prior decisions. Returns verbatim stored content instead of guessing from model memory.
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