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    Custom AI agent harnesses offer more control, one user argues

    A tailored system prompt can make verbose output easier to fix, the user says, and they point beginners to DAIR.AI's harness-engineering paper collection.

    elvisEL
    elieEL
    DAIR.AIDA
    11 Sources, ,

    TLDR

    DAIR.AI describes an agent harness as the machinery around a model, including its loop, context, tools and sub-agents. One user argues that building and customizing even a minimal harness can improve code, writing and costs.

    Their practical example is verbosity: they say a system prompt optimized for your needs makes overly long outputs easier to fix. In a follow-up reply, they recommend DAIR.AI's harness-engineering paper collection for people getting started.

    Combined views

    70K

    11 Sources, first seen 26d ago

    Combined views

    70K

    11 Sources, first seen 26d ago

    421 likes
    26d ago
    first seen 26d ago
    421 likes
    85 comments
    278 saves
    26 reposts
    85 comments
    278 saves
    26 reposts

    Sentiment

    Positive77.3%22.7%Negative

    Summary

    Many accounts praised custom AI agent harnesses for delivering better control, lower costs, and cleaner handoffs, while others objected that they create maintenance burdens, bloat, and hidden friction.

    Based on 44 sentiment-bearing replies from 44 accounts across 2 conversations.

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    11 Sources

    elvis@omarsar0And if you are just getting started with harnesses, check out this list of seminal papers: https://academy.dair.ai/papers/collections/harness-engineering26d
    DAIR.AI@dair_aiRT @omarsar0: If you build your own harness, you can drive that cost down even further. Out-of-the-box agent harnesses are, in my opinion,…23d
    elie@eliebakouchyeah i saw this a bit after, thanks for the answer! would be cool to have a full pareto plot to better understand in what scenarios the custom harness is better. for instance here high + opus 5 is on the lower end of capabilities a priori compared to fable 5.1 + max22d
    eric.base.eth@0xEricBrownthe coinbase harness is absolutely cooking and is by far my favorite, even after spending countless hours in claude code, codex, cursor, and open code working on anything outside of work feels like swimming with a ball and chain20d
    Ben Tossell@bentossellbuilt myself a harness + token usage tracker splits by agent/model, copy instructions for your own https://bentossell.com/token-activity/19d

    Sentiment

    Positive77.3%22.7%Negative

    Summary

    Many accounts praised custom AI agent harnesses for delivering better control, lower costs, and cleaner handoffs, while others objected that they create maintenance burdens, bloat, and hidden friction.

    Based on 44 sentiment-bearing replies from 44 accounts across 2 conversations.

    11 Sources

    elvis@omarsar0And if you are just getting started with harnesses, check out this list of seminal papers: https://academy.dair.ai/papers/collections/harness-engineering26d
    DAIR.AI@dair_aiRT @omarsar0: If you build your own harness, you can drive that cost down even further. Out-of-the-box agent harnesses are, in my opinion,…23d
    elie@eliebakouchyeah i saw this a bit after, thanks for the answer! would be cool to have a full pareto plot to better understand in what scenarios the custom harness is better. for instance here high + opus 5 is on the lower end of capabilities a priori compared to fable 5.1 + max22d
    eric.base.eth@0xEricBrownthe coinbase harness is absolutely cooking and is by far my favorite, even after spending countless hours in claude code, codex, cursor, and open code working on anything outside of work feels like swimming with a ball and chain20d
    Ben Tossell@bentossellbuilt myself a harness + token usage tracker splits by agent/model, copy instructions for your own https://bentossell.com/token-activity/19d