risk_of_bias_agent

risk_of_bias_agent is an agent for Claude Code from echoleesong/claude-skills-plugin. It costs 33 tokens per session (2,575 once invoked), scanned A, a copy of risk-of-bias-agent, MIT.

A research-review agent that assesses the risk of bias in included studies. It uses RoB 2 for randomized trials and ROBINS-I for non-randomized studies, producing structured domain assessments.

In plain words
What is it for?
It helps systematic-review teams evaluate bias, answer signaling questions, and produce traffic-light assessment results.
Why use it?
It replaces ad hoc judgments about study quality with assessments based on established review methods.

Agent for Claude Code

Written for Claude Code: PreToolUse hook event.

Part of the claude-skills-plugin plugin — 21 skills, 37 agents shipped together

Good fit It helps systematic-review teams evaluate bias, answer signaling questions, and produce traffic-light assessment results.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/echoleesong/claude-skills-plugin/risk_of_bias_agent
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/echoleesong/claude-skills-plugin

Made for: Claude Code.

Or install claude-skills-plugin, the plugin that ships this one along with the rest of its 21 skills, 37 agents.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for risk_of_bias_agent

README.md
[![agentmods](https://agentmods.dev/badge/agents/echoleesong/claude-skills-plugin/risk_of_bias_agent/github.svg)](https://agentmods.dev/agents/echoleesong/claude-skills-plugin/risk_of_bias_agent)
Your own site
<a href="https://agentmods.dev/agents/echoleesong/claude-skills-plugin/risk_of_bias_agent"><img src="https://agentmods.dev/badge/agents/echoleesong/claude-skills-plugin/risk_of_bias_agent/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for risk_of_bias_agent

Your own site · 80×15
<a href="https://agentmods.dev/agents/echoleesong/claude-skills-plugin/risk_of_bias_agent"><img src="https://agentmods.dev/badge/agents/echoleesong/claude-skills-plugin/risk_of_bias_agent.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 33 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,575 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 81% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00033 $0.02575
Opus 5 $0.00016 $0.01288
Sonnet 5 $0.00007 $0.00515
Haiku 4.5 $0.00003 $0.00258

Measured 10d ago against content hash 9b34eabb7957, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

risk_of_bias_agent scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

81% identical to risk-of-bias-agent — 22 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

skills/deep-research/agents/risk_of_bias_agent.md · 232 lines

How it starts

The opening of the file, as written. The whole thing — 232 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Risk of Bias Agent — Systematic Bias Assessment for Included Studies

Role Definition

You are the Risk of Bias Agent. You assess the risk of bias in studies included in a systematic review using validated instruments: RoB 2 for randomized controlled trials and ROBINS-I for non-randomized studies. You produce structured domain-level assessments with signaling questions and a traffic-light visualization output.

Identity: Methodologist with expertise in Cochrane risk of bias assessment tools Core Function: Transform subjective quality concerns into standardized, reproducible bias assessments

Phase Boundary (v3.9.2)

You are a single-phase agent assigned to Systematic Review Phase 2 (Investigation, bias-assessment side) — parallel to bibliography_agent and source_verification_agent in standard pipelines, but specific to systematic-review mode. Your sole deliverable is the RoB 2 / ROBINS-I assessment with traffic-light visualization output.

You MUST NOT:

  • WRITE files in phase{M}_*/ directories where M ≠ 2 (no inflate into Phase 3 meta-analysis, Phase 4 PRISMA report, Phase 5 review, Phase 6 revision)
  • Produce content classified as a downstream-phase deliverable type (meta-analysis effect sizes, GRADE certainty ratings, PRISMA report) even if you can see the data — those are meta_analysis_agent's and report_compiler_agent's jobs
  • Invoke or simulate any other agent persona's output
  • "Helpfully" continue past your assigned deliverable

You MAY READ files in phase1_*/ (RQ Brief, systematic-review protocol) and phase2_*/ (own phase, including the bibliography_agent output) for legitimate context. Downstream phases are not needed.

If downstream work is needed (meta-analysis, PRISMA compilation), return control to the caller.

Enforcement (v3.9.2): prompt-level only. Advisory verifier (scripts/check_pipeline_integrity.py) can detect violations post-hoc. Deterministic PreToolUse hook deferred to v3.10 active conductor (#134).

Core Principles

Read the full file on GitHub · 232 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 10d ago First seen · 232 lines · 33 tokens per session scan A 9b34eabb7957

Subscribe to this mod's changes

risk_of_bias_agent is an agent published in the GitHub repository echoleesong/claude-skills-plugin (4 stars, last pushed 3mo ago), licensed MIT. It adds 33 tokens to every session and 2,575 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 81% identical to risk-of-bias-agent, differing in 22 lines, and is treated as a copy.