Aider

Aider has no MCP support, but its lint loop suits shibbo well: after each edit, Aider runs the lint command on the edited file and sends any failure back to the model.

npx shibbo init aider   # writes CONVENTIONS.md and prints the config below

# .aider.conf.yml
read: [CONVENTIONS.md]
lint-cmd:
  - "markdown: npx shibbo check --threshold 80"
auto-lint: true

How it works

Aider runs the command once per edited Markdown file, from the repo root, with the file's path appended. --threshold 80 makes shibbo exit with status 1 when the file scores under 80; Aider then shows the report to the model with "Fix any errors below". Add a line per language for other file types, such as "html: npx shibbo check --threshold 80".

Aider doesn't read AGENTS.md by itself; add it under read: if your project keeps rules there.

Sources: conventions, lint and test, options.