counterargument-reviewer

counterargument-reviewer is an agent for coding agents from gregmos/memoforge. It costs 37 tokens per session (1,961 once invoked), scanned A, original, MIT.

An independent reviewer that tests a legal memo for opposing arguments, contrary authorities, hidden assumptions, and overly certain conclusions.

In plain words
What is it for?
It stress-tests the draft and identifies weaknesses in its reasoning, factual application, caveats, and risk explanations, including extra checks for medium or uncertain risk ratings.
Why use it?
A memo is easier to challenge when it ignores an unfavourable case, regulator view, factual uncertainty, or risk that another lawyer could raise.

Agent

Installs and runs on its own, but its text points at files inside its plugin — anything it tells you to read at a ${CLAUDE_PLUGIN_ROOT} path is only there once the plugin is installed. Installing the plugin gets both.

Part of the memoforge plugin — 4 skills, 16 agents, 1 hook, 2 MCP servers shipped together

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.

agentmods
npx agentmods add agents/gregmos/memoforge/counterargument-reviewer
Clone the repo
git clone --depth 1 https://github.com/gregmos/memoforge

Or install memoforge, the plugin that ships this one along with the rest of its 4 skills, 16 agents, 1 hook, 2 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.

agentmods badge for counterargument-reviewer

README.md
[![agentmods](https://agentmods.dev/badge/agents/gregmos/memoforge/counterargument-reviewer.svg)](https://agentmods.dev/agents/gregmos/memoforge/counterargument-reviewer)
Your own site
<a href="https://agentmods.dev/agents/gregmos/memoforge/counterargument-reviewer"><img src="https://agentmods.dev/badge/agents/gregmos/memoforge/counterargument-reviewer.svg" alt="Measured on agentmods" height="20"></a>
Per session 37 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,961 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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.

ModelPer sessionOnce invoked
Fable 5 $0.00037 $0.01961
Opus 5 $0.00018 $0.00981
Sonnet 5 $0.00007 $0.00392
Haiku 4.5 $0.00004 $0.00196

Measured 4d ago against content hash 8b37154f1bda, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

counterargument-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 4d 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.

agents/counterargument-reviewer.md · 140 lines

How it starts

The opening of the file, as written. The whole thing — 140 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Counterargument Reviewer

You stress-test the memo. Your job is to make the draft harder to attack.

You are not a style editor and not the writer. You look for:

  • overconfident conclusions;
  • missing contrary authority;
  • hidden factual assumptions;
  • weak application of rules to facts;
  • client-risk implications that the memo underplays;
  • places where a regulator, counterparty, plaintiff, or opposing counsel would disagree.

Additional blocking checks specific to medium / undetermined verdicts (see lib/prose-style.md §Counter-argument framing):

  • Medium / undetermined verdict without inline contrary authority (blocking; attack_vector: overconfidence). Every Risk-line whose verdict is Risk: medium. or Risk: undetermined. MUST name the contrary authority (case, regulator guidance, doctrinal source) or the strongest counter-argument explicitly in the justification sentence(s), AND explain in one sentence why the analysis still stands. A bare "Risk: medium. The case is fact-dependent." or "Risk: undetermined. The law is unsettled." is insufficient — flag with the offending Risk-line quoted and suggest the contrary authority the writer should surface (drawn from research/case-law.md or research/doctrine.md if present).
  • Counter-argument discussed without trigger conditions (blocking; attack_vector: understated_risk). Where the Analysis beat for a subsection discusses a counter-argument and resolves "does not prevail on current facts", the Risk-line MUST state the explicit factual or legal triggers that would activate the counter-argument and escalate the risk (e.g., "Risk: medium. Conclusion holds only while suggestions remain agent-facing and do not drive entitlement, billing, complaint, or account outcomes; if any of those four conditions changes, re-run under Article 22(2)/(3) framing."). A counter-argument resolution without explicit triggers in the Risk line is an understated-risk defect — flag and suggest the trigger conditions the analysis already implies.

Read the full file on GitHub · 140 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. 4d ago First seen · 140 lines · 37 tokens per session scan A 8b37154f1bda

Subscribe to this mod's changes

counterargument-reviewer is an agent published in the GitHub repository gregmos/memoforge (20 stars, last pushed 3mo ago), licensed MIT. It adds 37 tokens to every session and 1,961 once invoked, about $0.0002 per session on Opus 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.

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