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abstract indexed · arXiv 2608.24571 · updated 2026-10-18

Joint Optimization of Tool Creation and Use for Large Language Model Agents

First page of Joint Optimization of Tool Creation and Use for Large Language Model Agents
From the original paper · arXiv 2608.24571Page 1. Select the image to read the PDF.

SMITH replaces inference-time prompting of a frozen LLM to write and use tools with a single policy jointly trained via RL on build and use tasks, with separate reward axes for schema, code, and outcome failures. Adoption costs an RL training pipeline with exact verifiers for each task, curated build/use rollouts, and multi-axis reward computation—beyond a single 24 GB GPU for most teams without significant engineering effort. It can fail on tasks lacking automatic verifiers, when generated tools contain subtle bugs that propagate to users, and when tool pools overfit to the 13 training tasks despite reported out-of-domain transfer.

For solo builders

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What you would change

Apply the proposed tool-selection or argument-generation change in a sandbox.

Try the idea on your product

A proposed first test. Set your budget and success criteria before running it.

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Compare against

Your current agent with the same tool schemas and task budget.

  1. Locate the paper's implementation and check its license, model support, data needs, and hardware requirements. Stop here if you cannot obtain the required artifacts.
  2. Save a small set of representative product tasks and expected outcomes. Keep evaluation tasks out of any training or tuning, and choose quality and cost limits before running.
  3. Run the baseline and the proposed change on identical inputs. Keep other settings fixed and repeat paired runs to expose variation.
  4. Save per-task outputs, failures, timings, and all usage costs. Review regressions before expanding the test.

What to measure

Correct completed actions, invalid calls, retries, latency, and cost per completed task.

When to keep it

Keep the change only if it meets your preselected quality and latency limits and improves the metric you care about after setup and operating costs. Otherwise retain the baseline. This is an exploration plan, not a validated recommendation.

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minimum test setup
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published evidence setup
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source-linked claims
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exposure checks
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Why it was shortlisted

The technical change, research area, and reason it entered the archive.

recommendation
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research area
tool use
technical change
Joint RL training of tool creation and tool use
published
2026-08-25

The gains are real and quality-oriented, but the method requires RL training infrastructure and verified task suites that exceed constrained production setups, so tracking it until training-as-a-service or released checkpoints mature is the rational posture.

About the technical core

The technical core is an algorithm, not an equation.

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Claims and evidence

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  1. claim 01Paperraft inference
    Read the brief interpretation

    SMITH replaces inference-time prompting of a frozen LLM to write and use tools with a single policy jointly trained via RL on build and use tasks, with separate reward axes for schema, code, and outcome failures. Adoption costs an RL training pipeline with exact verifiers for each task, curated build/use rollouts, and multi-axis reward computation—beyond a single 24 GB GPU for most teams without significant engineering effort. It can fail on tasks lacking automatic verifiers, when generated tools contain subtle bugs that propagate to users, and when tool pools overfit to the 13 training tasks despite reported out-of-domain transfer.

    This is a Paperraft inference. It is not pinned to a verified PDF passage.

    Inspect the source
  2. claim 02Paperraft inference

    A 4B Qwen3 trained with SMITH reaches 79.8 macro-average accuracy on held-out tasks, outperforming an untrained 30B-A3B tool-writer, and 42.6 on out-of-domain GQA (+7.6 over the best same-backbone inference-time baseline).

    This is a Paperraft inference. It is not pinned to a verified PDF passage.

    Inspect the source

Exposure map

Author findings, Paperraft interpretations, and the next check. Missing analysis never counts as evidence of safety.

quality

Still unknown

Which tasks improve, and which regress against the baseline?

compute and memory

Still unknown

What memory, hardware, and total compute does the complete method require?

latency

Still unknown

Are startup time, typical response time, and slow requests measured separately?

operations

Still unknown

What must be monitored, maintained, and rolled back?

software compatibility

Still unknown

Does the implementation support your model, runtime, and hardware?

security

Still unknown

What new data access, permissions, or trust boundaries does it introduce?

data and training

Still unknown

What data preparation or training is required, and is it included in the cost?

reproducibility

Still unknown

Are code, versions, inputs, and evaluation scripts available?

Continue the investigation

A reading guide for tool use.

Editorial prompts, not findings from this paper or a validated test plan. Detailed analysis is still pending for the topics below.

What to inspect

Which assumptions does the proposed method need, and where might your workload violate them?

Plan a fair comparison

Identify the baseline, metric, dataset, and experimental settings in the paper. Which can you match?

Questions for adoption

What implementation and evaluation artifacts are available, and what would you need to supply?

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Inside the paper

Preview the first 3 pages of the original PDF. Click the stack to turn the page.

The downloadable skill includes SKILL.md and evidence.json, with recorded findings and unanswered checks. TRY-IT.md adds a product test plan and a blank results sheet.

A reading aid for your agent. Findings still need validation.

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Provisional research brief updated 2026-10-18. Paperraft has not reproduced this experiment.

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arXiv 2608.24571

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