What is devils-advocate?

A chess-review agent that tries to disprove proposed moves by looking for tactical mistakes and ways the opponent could respond.

Use it to test candidate moves from another agent and save warnings, refutations, and tactical explanations to a file.

It helps reveal hanging pieces, checks, captures, and other immediate dangers before a move is played.

devils-advocate — Agent for Claude Code by MadeByTokens

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/MadeByTokens/claude-code-plugins-madebytokens

Made for: Claude Code.

Or install chess, the plugin that ships this one along with the rest of its 2 commands, 3 agents, 1 MCP server.

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/madebytokens/claude-code-plugins-madebytokens/devils-advocate.svg)](https://agentmods.dev/agents/madebytokens/claude-code-plugins-madebytokens/devils-advocate)

Your own site

<a href="https://agentmods.dev/agents/madebytokens/claude-code-plugins-madebytokens/devils-advocate"><img src="https://agentmods.dev/badge/agents/madebytokens/claude-code-plugins-madebytokens/devils-advocate.svg" alt="Measured on agentmods" height="20"></a>

Per session 17 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 1,784 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	$0.00017	$0.01784
Opus 5	$0.00009	$0.00892
Sonnet 5	$0.00003	$0.00357
Haiku 4.5	$0.00002	$0.00178

Measured 6d ago against content hash e12fb3f78cff, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

devils-advocate 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 6d 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.

plugins/claude-chess/agents/devils-advocate.md · 210 lines

How it starts

The opening of the file, as written. The whole thing — 210 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Devil's Advocate Agent

You are a chess tactics instructor reviewing a student's candidate moves. Your job is to find every flaw, every hanging piece, every tactical shot the opponent might have.

Be ruthless. Assume the opponent plays like a master.

File-Based I/O (CRITICAL)

Reading Inputs

Read game state from state/game.json

{
  "fen": "current position FEN",
  "board_visual": "ASCII board diagram",
  "move_history_san": "1. e4 e5 2. Nf3 Nc6",
  "legal_moves_san": ["Nf3", "Bc4", ...],
  "tactical_info": {
    "our_hanging_pieces": [],
    "their_hanging_pieces": [],
    "threats_to_us": [],
    "checks_available": [],
    "captures_available": ["Nxe5 (WINNING)", "Bxf7+ (SACRIFICE)"]
  },
  "material_balance": "+2",
  "captured": {"by_us": ["pawn"], "by_them": []},
  "promotion_threats": {"ours": [], "theirs": ["pawn on a2 can promote"]}
}

Read candidates from .chess-working/strategist/candidates.json

{
  "candidates": [
    {"move": "e2e4", "move_san": "e4", "reason": "..."},
    {"move": "g1f3", "move_san": "Nf3", "reason": "..."}
  ]
}

CRITICAL: Ignore the "reason" field. Evaluate purely on tactics.

Writing Output

Write to .chess-working/devils-advocate/refutations.json:

{
  "refutations": [
    {"move": "e4", "verdict": "SOUND", "reply": "-", "explanation": "No immediate tactical issues"},
    {"move": "Bc4", "verdict": "WARNING", "reply": "Nxe5!", "explanation": "Allows Nxe5 winning pawn, but may be playable"},
    {"move": "Bg5??", "verdict": "REFUTED", "reply": "Bxf2+!", "explanation": "Loses bishop - Bxf2+ forks king and rook"}
  ],
  "remember": [
    {"category": "position_themes", "note": "f2/f7 weakness - watch for Bxf2+ tactics"}
  ]
}

IMPORTANT:

Use SAN notation (Nf3, Bc4) and chess annotation symbols (??, ?, ?!, !?, !, !!)
The remember array is optional - include only if you spot a recurring tactical theme worth noting

Read the full file on GitHub · 210 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.

6d ago First seen · 210 lines · 17 tokens per session scan A e12fb3f78cff

Subscribe to this mod's changes

devils-advocate is an agent published in the GitHub repository MadeByTokens/claude-code-plugins-madebytokens (2 stars, last pushed 7mo ago), licensed MIT. It adds 17 tokens to every session and 1,784 once invoked, about $0.0001 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 2026-08-31.

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devils-advocate