What is harness-adversarial-reviewer?

An adversarial code reviewer that imagines how otherwise-correct changes could fail when combined, misused, or given unexpected input.

Use it when reviewing completed work or responding to review feedback, especially when ordinary bug, security, and architecture reviews may miss failures caused by combinations of changes.

It finds assumption violations, interactions between components, abuse cases, and chains where one failure spreads to other parts of the system.

harness-adversarial-reviewer — Agent by Intense-Visions

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/Intense-Visions/harness-engineering

Made for: Claude Code.

Or install harness-claude, the plugin that ships this one along with the rest of its 85 skills, 91 commands, 16 agents, 4 hooks, 4 MCP servers.

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.

README.md

[![agentmods](https://agentmods.dev/badge/agents/intense-visions/harness-engineering/harness-adversarial-reviewer/github.svg)](https://agentmods.dev/agents/intense-visions/harness-engineering/harness-adversarial-reviewer)

Your own site

<a href="https://agentmods.dev/agents/intense-visions/harness-engineering/harness-adversarial-reviewer"><img src="https://agentmods.dev/badge/agents/intense-visions/harness-engineering/harness-adversarial-reviewer/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.

Your own site · 80×15

<a href="https://agentmods.dev/agents/intense-visions/harness-engineering/harness-adversarial-reviewer"><img src="https://agentmods.dev/badge/agents/intense-visions/harness-engineering/harness-adversarial-reviewer.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 10,460 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 original No closer match found 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.

Model	Per session	Once invoked
Fable 5.1	$0.00033	$0.10460
Opus 5.5	$0.00013	$0.04184
Sonnet 5.5	$0.00007	$0.02092
Haiku 4.5	$0.00003	$0.01046

Measured 2mo ago against content hash 181ca98e3440, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

harness-adversarial-reviewer 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 2mo 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

Copies of this mod

4 near-identical copies found in the catalogue:

harness-frontend-races-reviewer — 94% identical, 8 lines differ
harness-typescript-strict-reviewer — 94% identical, 8 lines differ
harness-security-reviewer — 92% identical, 287 lines differ
harness-code-reviewer — 89% identical, 15 lines differ

.antigravity-extension/agents/harness-adversarial-reviewer.md · 874 lines

How it starts

The opening of the file, as written. The whole thing — 874 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Role

Sit between bug, security, and architecture. Hunt for failure modes that single-pattern agents miss — assumptions the diff relies on but does not enforce, two correct pieces that misbehave together, adversarial inputs the diff does not anticipate, and (at Deep depth) single failures that cascade through downstream callers. Never re-flag findings owned by the existing 4 agents. Emit ReviewFinding[] with domain: 'bug', subagent: 'adversarial', and numeric confidence per the shared confidence rubric.

Skills

harness-code-review

Steps

Execute harness-code-review skill (manual)
Execute harness-code-review skill (on_pr)

Methodology

Harness Code Review

Multi-phase code review pipeline — mechanical checks, graph-scoped context, parallel review agents, cross-agent deduplication, and structured output with technical rigor over social performance.

When to Use

When performing a code review (manual invocation or triggered by on_pr / on_review)
When requesting a review of completed work (see Role A at the end of this document)
When responding to review feedback (see Role C at the end of this document)
NOT for in-progress work (complete the feature first)
NOT for rubber-stamping (if you cannot find issues, look harder or state confidence level)
NOT for style-only feedback (leave that to linters and mechanical checks)

Argument Resolution

When invoked by autopilot (or with explicit arguments), resolve paths before starting:

Session slug: If session-slug argument provided, set {sessionDir} = .harness/sessions/<session-slug>/. Pass to gather_context({ session: "<session-slug>" }). All handoff writes go to {sessionDir}/handoff.json.
Commit range: If commit-range argument provided (e.g., abc123..HEAD), use as diff scope in Phase 2 MECHANICAL and Phase 7 OUTPUT. Otherwise, auto-detect from git environment.

When no arguments are provided (standalone invocation), session slug is unknown — omit from gather_context, fall back to global .harness/ paths. Diff scope auto-detected.

Read the full file on GitHub · 874 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.

2mo ago First seen · 874 lines · 33 tokens per session scan A 181ca98e3440

Subscribe to this mod's changes

harness-adversarial-reviewer is an agent published in the GitHub repository Intense-Visions/harness-engineering (23 stars, last pushed 3d ago), licensed MIT. It adds 33 tokens to every session and 10,460 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Code review

harness-adversarial-reviewer next to 6 agents from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
harness-adversarial-reviewerIntense-Visions/harness-engineering	Agent	23	3d ago	MIT	A	33	Claude Code
cpp-revieweraffaan-m/ECC	Agent	298k	4d ago	MIT	A	41	Claude Code, Kiro
thermo-nuclear-code-quality-review-subagentmichael-denyer/pstack-claude	Agent	4.1k	yesterday	MIT	A	68	Claude Code
review-obsidian-guidelinesuphy/obsidian-reminder	Agent	662	yesterday	MIT	A	63	Claude Code
karimo-implementeropensesh/KARIMO	Agent	290	24d ago	Apache-2.0	A	49	Claude Code
atomic-auditordamusix/atomic-claude	Agent	115	4d ago	MIT	A	169	Claude Code
reviewergenkovich/sdd	Agent	199	22d ago	MIT	A	81	Claude Code