Quibbler
Quibbler is a critic for your coding agent. It runs in the background and critiques your coding agent's actions, either via hooks or an MCP. When your coding agent is once again failing in the same ways, or ignoring your spec, instead of having to prompt it, the Quibbler agent will automatically observe and correct it.
It will also learn rules from your usage, and then enforce them so you don't have to.
Demo
demo.mp4
What Quibbler Prevents
We've found Quibbler useful in automatically preventing agents from:
Fabricating results without running commands
Not running tests or skipping verification steps
Not following your coding style and patterns
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