julianbei/arno

Overview

arno is an MCP server that gives AI agents IDE-like code editing. It reads code by symbol, edits against a revision, validates changes with the user's own build, and can revert. Supports Go, Java, Scala, TypeScript, Python, Rust, Ruby.

Best for

Best for
Developers wiring AI agents into safe, reversible code edit workflows

Use cases

• Refactor code by symbol name
• Apply changes with build validation
• Revert agent edits that fail checks

How to use

Tools exposed

• ARNO_WORKSPACE_ROOT
• ARNO_STATE_DIR
• ARNO_VERSION
• ARNO_INSTALL_DIR
• ARNO_SERVERS
• ARNO_RELEASE_URL
• read_range
• workspace_tree
• replace_symbol
• replace_text
• replace_file
• create_file
• delete_file
• delete_symbol
• run_tests
• run_command
• declare_command
• job_status
• job_output

Tested with

Claude Desktop, Claude Code, Cline, VS Code

Notes

arno is an MCP server that gives AI agents IDE-like code editing. It reads code by symbol, edits against a revision, validates changes with the user’s own build, and can revert. Supports Go, Java, Scala, TypeScript, Python, Rust, Ruby.

0 stars on GitHub. Last updated 2026-09-16. Licensed Apache-2.0.

Use cases

• Refactor code by symbol name
• Apply changes with build validation
• Revert agent edits that fail checks

Pros

• Symbol-based reads avoid line number guesswork
• Edits are tied to revisions for easier rollback
• Uses your own build command for validation

Cons

• No release milestones or community signal yet (0 stars)
• Requires a working build setup to validate changes
• Limited to the seven listed languages

Indexed from awesome-mcp-servers-punkpeye and enriched against its public facts.