# The edit is easy. Knowing what breaks is hard.

Canonical source: https://maguyva.ai/know-what-breaks

License: text under [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/); code samples under [MIT-0](https://opensource.org/license/mit-0); the Maguyva name, logos, brand assets and other code are not covered. Details: [maguyva.ai/license](https://maguyva.ai/license).

Before a refactor, your agent should know every caller, importer, and dependent. Maguyva answers that from the real call graph, not a grep.

Impact analysis lists everything that depends on the code you're about to change. Maguyva returns those callers and dependents with file paths and line numbers, across packages and languages, before the agent edits a line.

- [Index your first repo](https://app.maguyva.ai/auth/sign-up?plan=free)
- [Read the docs](https://maguyva.ai/docs)

free plan: 3 repos, 50K indexed lines, no card.

## Exact totals, explicit gaps

*// blast radius*

Graph search returns exact caller totals across the monorepo and says whether the list is complete. Calls matched by name only are listed separately.

## Grounded in real lines

*// before you ship*

File paths and line numbers, so the migration list is right before CI goes red.

## 23 documented MCP clients

*// any client*

One remote MCP integration. No local indexer, no IDE to switch.

## Check blast radius before you refactor.

Index one repo you already know and ask what calls the function you are about to change.

01. **Index a repo you know**: Pick the codebase where a refactor scares you. Free tier: 3 repos, 50K indexed lines.
02. **Connect over MCP**: Claude, Codex, Cursor, or any MCP client. One remote server, no local setup.
03. **Ask what breaks if you change it**: Get callers and importers from the real graph, not a grep, with exact totals and a completeness flag, before you touch a line.

## Better context, safer edits.

Start free. Know what breaks before your agent changes a line. No credit card, no sales call.

- [Index your first repo](https://app.maguyva.ai/auth/sign-up?plan=free)
- [Read the docs](https://maguyva.ai/docs)