Skip to content
← Back to research index

abstract indexed · arXiv 2609.29251 · updated 2026-10-18

Policy as Code: A Coroutine-Bridge Harness for Fast-Reasoning Reliability on CAR-bench

First page of Policy as Code: A Coroutine-Bridge Harness for Fast-Reasoning Reliability on CAR-bench
From the original paper · arXiv 2609.29251Page 1. Select the image to read the PDF.

It replaces the conventional next-action agent loop, in which each round of tool results costs one model call, with a harness where the model emits a Python program that blocks and resumes in place across tool exchanges, collapsing multi-turn tasks to a median of two model calls and letting deterministic policies live as code rather than prompt rules. Costs are primarily engineering complexity: a coroutine bridge between model output and the tool executor, sandboxing of model-generated code, and reliance on a static byte-identical prompt whose cache benefits evaporate if the prompt is edited. Failures after adoption include incorrect or unsafe model-generated code executing in the tool layer, tasks that do not decompose into a single blocking program, and reduced effectiveness on models too weak to write correct multi-step control flow in one shot.

For solo builders

A possible application for this research area. Paper-specific feasibility still needs a full-paper review.

An assistant chooses the wrong API or sends arguments your product cannot use.

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.

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

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.

Download test plan ↓

abstract indexedPaperraft next step

Do not allocate compute yet.

This page uses the abstract and public adoption signal only. Request the deep report before relying on its recommendation.

Abstract-level screening only. Risks and infrastructure may not have been evaluated. This recommendation is not a reproduced result.
minimum test setup
not reported
published evidence setup
not reported
source-linked claims
0 of 2
exposure checks
0 of 8

Why it was shortlisted

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

recommendation
adopt
research area
tool use
technical change
Code-emitting coroutine agent harness
published
2026-09-24

The design requires no training or extra hardware, works through third-party APIs including fast inference providers, and directly reduces model-call count, latency, and cached input cost on tool-using workloads.

About the technical core

Equations have not been fetched yet.

When reading the methods, identify the rule, algorithm, or evaluation protocol that produces the claimed change. An equation is useful here only if it explains that mechanism.

Inspect the original paper

Claims and evidence

A claim is source-linked only when the PDF page and matching excerpt are available.

  1. claim 01Paperraft inference
    Read the brief interpretation

    It replaces the conventional next-action agent loop, in which each round of tool results costs one model call, with a harness where the model emits a Python program that blocks and resumes in place across tool exchanges, collapsing multi-turn tasks to a median of two model calls and letting deterministic policies live as code rather than prompt rules. Costs are primarily engineering complexity: a coroutine bridge between model output and the tool executor, sandboxing of model-generated code, and reliance on a static byte-identical prompt whose cache benefits evaporate if the prompt is edited. Failures after adoption include incorrect or unsafe model-generated code executing in the tool layer, tasks that do not decompose into a single blocking program, and reduced effectiveness on models too weak to write correct multi-step control flow in one shot.

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

    Inspect the source
  2. claim 02Paperraft inference

    60.0% Pass^3 on the hidden CAR-bench evaluation, 4.5x the organizer baseline, at the lowest estimated cost and fastest median task latency (3.14 s) of any entry above that 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?

Read the paper with these questions

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.

Page 1 of 3
Open this page in the PDF ↗

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

Discuss this paper

Question a claim, compare interpretations, or share what happened when you tried the method.

Join the conversation on GitHub. Use this paper's arXiv ID in the title when starting a discussion.

arXiv 2609.29251

Comments are public and separate from Paperraft's research brief. When sharing a result, include the model, hardware, baseline and a link to your work.