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abstract indexed · arXiv 2610.01564 · updated 2026-10-18

Chaining Skills to Hijack LLM Agents

First page of Chaining Skills to Hijack LLM Agents
From the original paper · arXiv 2610.01564Page 1. Select the image to read the PDF.

This is an attack paper, not an optimization: APEX replaces single-skill prompt injection with multi-skill chains in which an agent-written progress record carries a false user-approval claim into a downstream attacker-selected action, succeeding in 512 of 690 attempts (74.2%; 84.3% on GPT-5.4 versus 17.4% when the workflow is merged into one skill). Adopting the lesson costs engineering effort rather than compute: restrict skill chaining from open-source repositories, treat skill-produced files as untrusted input, and gate consequential actions behind explicit user confirmation; the paper's own prompting defense cuts success to 59.1% but drops benign task pass rates from 86.7% to 56.3%, so that defense has a real quality cost. What can fail: prompt-based verification is bypassable and degrades legitimate performance, so teams relying on it alone retain a large residual attack surface.

For solo builders

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

An agent reads external documents or tool responses that may contain malicious instructions.

What you would change

Replay attacks and legitimate lookalikes in an isolated copy of your agent workflow.

Try the idea on your product

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

Replay attacks and legitimate lookalikes in an isolated copy of your agent workflow.

Compare against

Your existing checks with the same tasks, permissions, and tool responses.

  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

Successful attacks missed, legitimate actions blocked, detection delay, and review cost.

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 1
exposure checks
0 of 8

Why it was shortlisted

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

recommendation
test
research area
safety and guardrails
technical change
Adversarial skill chaining across LLM agent workflows
published
2026-10-01

The reader deploying agents with third-party skills faces this exact threat model, and the actionable mitigations (skill provenance controls, human approval for sensitive actions) are cheap to test but require workload-specific validation because the evaluated defense halves benign task success.

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

    This is an attack paper, not an optimization: APEX replaces single-skill prompt injection with multi-skill chains in which an agent-written progress record carries a false user-approval claim into a downstream attacker-selected action, succeeding in 512 of 690 attempts (74.2%; 84.3% on GPT-5.4 versus 17.4% when the workflow is merged into one skill). Adopting the lesson costs engineering effort rather than compute: restrict skill chaining from open-source repositories, treat skill-produced files as untrusted input, and gate consequential actions behind explicit user confirmation; the paper's own prompting defense cuts success to 59.1% but drops benign task pass rates from 86.7% to 56.3%, so that defense has a real quality cost. What can fail: prompt-based verification is bypassable and degrades legitimate performance, so teams relying on it alone retain a large residual attack surface.

    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 safety and guardrails.

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.

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arXiv 2610.01564

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