Quibbler – A critic for your coding agent that learns what you want

In plain words

Quibbler is an AI tool that provides feedback on code generated by coding agents. It learns from user preferences over time to tailor its critiques to individual needs and coding standards. Designed for developers who use AI-assisted coding tools, Quibbler helps refine generated code by offering targeted, personalized criticism. The tool adapts its evaluation criteria based on what matters most to each user, making it useful for improving code quality and maintaining consistent style across projects.

written from the facts on this page · September 2026

From the sources

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. Quibbler maintains context across reviews, learning your project's patterns and rules over time. { "mcpServers" : { "quibbler" : { "command" : " quibbler mcp " , "env" : { "ANTHROPIC_API_KEY" : " your-api-key-here " } } } } Note : If you have a logged-in Claude Code or Claude Max account,…from github.com

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