lsp-impact

name	lsp-impact
description	Blast-radius analysis for a symbol or file — shows all callers, type supertypes/subtypes, and reference count before you change it. Use when refactoring, deleting, or changing the signature of any function, type, or method. Also accepts a file path to surface all exported-symbol impact in one shot.
argument-hint	[symbol-name | file-path]
user-invocable	true
allowed-tools	mcp__lsp__go_to_symbol mcp__lsp__find_callers mcp__lsp__type_hierarchy mcp__lsp__find_references mcp__lsp__get_server_capabilities mcp__lsp__blast_radius
license	MIT
compatibility	Requires the agent-lsp MCP server (github.com/blackwell-systems/agent-lsp)
metadata	{"required-capabilities":"referencesProvider","optional-capabilities":"callHierarchyProvider typeHierarchyProvider workspaceSymbolProvider"}

Requires the agent-lsp MCP server.

lsp-impact

Blast-radius analysis for any symbol or file. Discovers all direct references, callers (via call hierarchy), and type relationships before you touch anything. Read-only — does not modify any files.

Run this skill before lsp-edit-export: impact tells you what exists and how widespread the change is; lsp-edit-export tells you how to execute the change safely.

Invocation:

• File path (e.g. "internal/lsp/client.go") → use the File-level entry (Step 0) to surface all exported-symbol impact at once.
• Symbol name in dot notation (e.g. "codec.Encode", "Buffer.Reset") → skip Step 0; start at Prerequisites, then Step 1.

---

Step 0 — File-level entry (when user provides a file path)

Use this shortcut when the user is changing or auditing an entire file rather than a single symbol. blast_radius enumerates all exported symbols in the file, resolves their references, and returns test callers (with enclosing test function names) and non-test callers in a single call.

mcp__lsp__blast_radius({
  "changed_files": ["/abs/path/to/file.go"],
  "include_transitive": false   // set true to surface second-order callers
})

Returns:

• affected_symbols — each exported symbol with its reference count
• test_callers — test files + enclosing test function names
• non_test_callers — production call sites

Decision after Step 0:

Result	Action
0 non-test callers	Low blast radius. Proceed with change.
Few callers, known files	Medium risk. Update each call site.
Many callers across packages	High risk. Consider staged rollout.
Want symbol-level detail	Continue to Steps 1–5 for any specific symbol.

Skip Steps 1–5 if the file-level summary is sufficient.

---

Prerequisites (for symbol-level Steps 1–5)

If LSP is not yet initialized, call mcp__lsp__start_lsp with the workspace root first.

Check what the server supports before proceeding — find_callers and are optional LSP features not implemented by all servers: