devils-advocate

devils-advocate is a skill for Claude Code from t0ddharris/compound-marketing. It costs 164 tokens per session (2,419 once invoked), scanned A, original, no licence file.

A way to send work to Google Gemini for a critical second opinion from a different AI model.

In plain words
What is it for?
Pressure-testing decisions, plans, blog drafts, landing pages, marketing ideas, positioning statements, campaigns, and code.
Why use it?
It helps expose weak assumptions, overlooked risks, and other issues in plans, writing, designs, or code.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

Part of the compound-marketing plugin — 54 skills, 7 agents, 1 hook shipped together

Good fit Pressure-testing decisions, plans, blog drafts, landing pages, marketing ideas, positioning statements, campaigns, and code.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/t0ddharris/compound-marketing/devils-advocate
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.

Any agent
npx skills add t0ddharris/compound-marketing --skill devils-advocate
Clone the repo
git clone --depth 1 https://github.com/t0ddharris/compound-marketing

Made for: Claude Code.

Or install compound-marketing, the plugin that ships this one along with the rest of its 54 skills, 7 agents, 1 hook.

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 devils-advocate

README.md
[![agentmods](https://agentmods.dev/badge/skills/t0ddharris/compound-marketing/devils-advocate.svg)](https://agentmods.dev/skills/t0ddharris/compound-marketing/devils-advocate)
Your own site
<a href="https://agentmods.dev/skills/t0ddharris/compound-marketing/devils-advocate"><img src="https://agentmods.dev/badge/skills/t0ddharris/compound-marketing/devils-advocate.svg" alt="Measured on agentmods" height="20"></a>
Per session 164 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,419 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 unknown 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 5.1 $0.00164 $0.02419
Opus 5 $0.00082 $0.01210
Sonnet 5 $0.00033 $0.00484
Haiku 4.5 $0.00016 $0.00242

Measured 7d ago against content hash 33be80b86f0f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, 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 7d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/challenge.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

.claude/skills/devils-advocate/SKILL.md · 198 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 7d ago First seen · 198 lines · 164 tokens per session scan A 33be80b86f0f

Subscribe to this mod's changes

devils-advocate is a skill published in the GitHub repository t0ddharris/compound-marketing (1 stars, last pushed 6d ago), with no licence file. It adds 164 tokens to every session and 2,419 once invoked, about $0.0008 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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