Initialize error_msg before use to prevent NameError when tool call arguments parse successfully but tool name is invalid.

updates: - [github.com/astral-sh/ruff-pre-commit: v0.14.10 → v0.14.11](https://github.com/astral-sh/ruff-pre-commit/compare/v0.14.10...v0.14.11) Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

This is because it mistakenly looked for the "env" key rather than "environment" Closes #699

Changed the submission prompt to instruct the agent to add specific modified source files instead of using `git add -A`, which could include unrelated files like compiled code, cache files, or other artifacts. Co-authored-by: Kilian Lieret <kilian.lieret@posteo.de>

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