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File › Scripts › Other Script… picks a .js or .jsx file, shows a warning that can be turned off in Preferences › General, and runs the script against the open documents through the `vc` object. The new `script.run` and `script.stop` commands run and stop a script over MCP. - A run is one transaction. Each document it changed gets one undo step named Run Script. An uncaught error, a limit or a stop puts every document, the paint, the clipboard, menu state and preferences back. - A command that fails inside a run, or whose result is too large to reach the script, is undone and throws an error the script can catch. - Files a command wrote stay on disk and the report names them, also when the run is stopped from the quit question. - While a script runs, other commands that change anything fail with a busy error; MCP reports it as JSON-RPC error -32003. - In the app the run advances one slice per frame with a Stop button in the status bar. A run that adds a great many objects asks whether to continue; Stop and Escape end it. - Commands that change state outside the documents, such as prefs.*, plugin.* and file.place.queue, are refused to scripts. Docs: docs/mcp.md, docs/gaps.md, docs/roadmap.md, docs/target-app-parity.md.