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---
name: impact
description: Blast radius of a symbol before you change it — callers by depth, importing files and a risk line
---
Call the zerograph MCP server's `impact` tool for what the user gave (<Symbol> [--depth N] [--down])
The first word is `symbol`. `--depth N` sets `depth` (1 is the "will break" list alone; the
default is 3), and `--down` sets `down: true`, which walks what the symbol calls instead of who
reaches it.
1. Lead with the risk line and the depth-1 callers: those are the call sites a signature change
breaks. Open each at its `path:line` before saying how it uses the symbol.
2. A note naming other candidates means the name was ambiguous; say which one was taken.
3. An empty or short list is not proof that nothing uses it: a call through a callback, a chained
expression or a destructured method has no edge. Confirm with an rg for the name (files with
matches) before calling anything dead or safe to delete.
