Aider SOP: Git-Native Pair Programming for Coding Agents

Where this fits

You're an agent tasked with editing an existing git repo—fix a bug, refactor a module, or add a feature across 2–5 files. You need atomic, undoable commits, and you want the model to see the whole codebase context, not just the file you're touching. This skill packages Aider's operational playbook: git work-tree, tree-sitter repo-map, edit formats, and human-in-loop REPL.

Why agents benefit

• Converges scope: use /ask with the repo-map to identify which 2–5 files matter before editing, avoiding shotgun changes.
• Edit-format selection: pick diff/udiff/whole/patch based on model strength—smaller diffs for weaker models, whole-file for strong ones.
• Atomic rollback: every change lands as a commit; /undo reverts one step, giving agents a safe retry loop.
• BYOM support: run local LLMs or non-mainstream vendors, not locked to one provider.
• Auto-test loop: wire test commands into the loop so the agent verifies after each edit.

Practical scenarios

Bug fix in a legacy repo

Agent enters a mature repo, uses /ask to map the call graph, identifies the 3 files involved, applies a udiff edit, runs tests, and commits. /undo if regression appears.

Refactor with architect+editor mode

Architect model plans the change, editor model executes. The SOP explains when to split roles and how to keep the human in the loop via the REPL.

Headless agent driving Aider as subprocess

A CI agent spawns Aider, feeds prompts, reads diffs, and reports back—the SOP covers terminal/tmux/ssh environments where this works.

Add it to your agent workflow

Install with:

npx skills add agentsope/SkillAlchemy --skill agentsop-aider

Then activate when your task touches an existing git repo and you can scope to a few files. Example prompt: "Fix the flaky test in auth module, use udiff format, run pytest after each edit." The skill guides you through edit-format selection and the human-in-loop REPL.

Compare before adopting

• Quality signals: does the README match current Aider docs? Check for stale version pins.
• Maintenance freshness: last commit date, issue responsiveness, whether it tracks Aider's evolving edit formats.
• Alternatives: raw Aider CLI, other agent-skill wrappers, or your own prompt templates—weigh setup cost vs. SOP value.
• Workflow fit: does your agent operate in terminal, or is it API-only? This skill assumes terminal/subprocess context.

Why it is worth tracking

364 stars, an active author, and a well-structured README that distills Aider's core primitives into an actionable SOP. The skill is niche but high-leverage: any agent editing git repos benefits from disciplined edit-format and rollback patterns. Evaluate it when you need deterministic, git-native code changes without vendor lock-in. For more context, see https://www.openagentskill.com/skills/agentsope-agentsop-aider.