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

114 points - 10/31/2025

Source
  • p0w3n3d

    10/31/2025

    In other words, the Quibbler siphons wrackspurts away from your code.

    • mouse_

      10/31/2025

      There's so many agents to handle my agents, I'm gonna need agents for my agent agents soon.

    • gexla

      10/31/2025

      More explanation here that I found by Googling around. Though not sure it has more info than the Github page.

      https://fulcrumresearch.ai/2025/10/22/introducing-orchestra-...

      • janpio

        10/31/2025

        The demo video in the GH page didn't work for me, but there is also one on Twitter/X: https://xcancel.com/fulcrumML/status/1984054489851310191

        • nberkman

          10/31/2025

          Submitted a PR with AWS Bedrock support: https://github.com/fulcrumresearch/quibbler/pull/5/files (credits!)

          • balleddog

            10/31/2025

            Is an anthropic api key really necessary? A major roadblock for taking a test drive. Already have a Claud Max subscription but an anthropic api key still need at least 5$/mon extra.

              • asn0

                10/31/2025

                You could use the prompts in the code to create a Claude Code sub-agent[1], which would do the same thing without an API key

                1. https://docs.claude.com/en/docs/claude-code/sub-agents

                  • threecheese

                    11/01/2025

                    How would you invoke the subagent? Can a HookResponse cause a subagent to be invoked, to perform analysis on the action taken and then inject that back into the main loop?

                    Or would the hook invoke another instance of claude code?

                    I just read through the hook docs and I’m a bit fuzzy on the bidirectionality of it.

                • epiccoleman

                  10/31/2025

                  I really want Anthropic to let me make an API token that pulls from the same pool of usage that my Pro subscription does with the official clients. It would be cool to be able to run experiments with alternate clients and automation and stuff without having to go swipe the card at the ol' API token refilling station.

                  • thenthenthen

                    10/31/2025

                    Sounds like video streaming services…

                • selfawareMammal

                  10/31/2025

                  An agent's agent?

                    • hikarudo

                      10/31/2025

                      A gentleman's gentleman!

                      • oneandonley1

                        10/31/2025

                        Sounds like a wip to me, "do it better or get punished"

                    • stacktraceyo

                      11/01/2025

                      Can the same concept be used for non coding tasks?

                      • benzible

                        11/03/2025

                        Cool concept, but I picture Quibbler as an off-brand Batman villain.

                        • agarttha

                          10/31/2025

                          Replace the middle manager

                          • etherio

                            10/31/2025

                            hey HN! happy to answer any questions

                            this kind of tool is especially useful in longer running tasks to enforce your intent without having to check in on your agent all the time

                              • anonymous908213

                                10/31/2025

                                Can users stack Quibblers, so Quibbler 2 corrects Quibbler 1 if, say, it fabricates an issue in the code it's reviewing? If so, have you found an optimum number of Quibblers for the Quibbler stack? Also, might users form a Quibbler council such that multiple Quibblers review the same thing and form a consensus before proceeding?

                                  • Balinares

                                    10/31/2025

                                    I love the pixel-perfect precision with which this comment is straddling the Poe's Law line.

                                    That aside I also love the concept of Quibbler Council and I'd get a kick out of seeing it in action.

                                      • sheepscreek

                                        10/31/2025

                                        MoQs - Mixture of Quibblers? Would be convenient to have them run on dedicated FGPAs. Then they can facilitate near real-time quibbing at the network level across all packets.

                            • anonymous908213

                              10/31/2025

                              But who polices the vibe police?

                                • Brajeshwar

                                  10/31/2025

                                  “Well, who’s gonna monitor the monitors of the monitors?” — Enemy of the State (Movie)

                              • qq66

                                10/31/2025

                                > We’ve found Quibbler useful in preventing agents from: 1) fabricating results without running commands

                                What a world we've created for ourselves

                                  • N_Lens

                                    10/31/2025

                                    Next step is critics for the critics.

                                      • CoastalCoder

                                        10/31/2025

                                        Until they reach critical mass.

                                • 10/31/2025

                                  • cjonas

                                    10/31/2025

                                    Vibeception