What is code-skeptic?

A review agent that challenges a proposed feature and its implementation plan without writing code. It reports risks using severity levels and decides whether the work should proceed, change, or stop.

Use it to critique feature plans, inspect project context, find technical or security risks, and produce concrete fixes for the plan.

It exposes missing cases, scope problems, security concerns, and other weaknesses before development begins.

code-skeptic — Agent for coding agents by alexeyshishin: A review agent that challenges a proposed feature and…

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/alexeyshishin/as-skill/code-skeptic

Clone the repo

git clone --depth 1 https://github.com/alexeyshishin/as-skill

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/alexeyshishin/as-skill/code-skeptic.svg)](https://agentmods.dev/agents/alexeyshishin/as-skill/code-skeptic)

Your own site

<a href="https://agentmods.dev/agents/alexeyshishin/as-skill/code-skeptic"><img src="https://agentmods.dev/badge/agents/alexeyshishin/as-skill/code-skeptic.svg" alt="Measured on agentmods" height="20"></a>

Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 234 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.

Model	Per session	Once invoked
Fable 5	$0.00000	$0.00234
Opus 5	$0.00000	$0.00117
Sonnet 5	$0.00000	$0.00047
Haiku 4.5	$0.00000	$0.00023

Measured 3d ago against content hash 24f7dad06d9b, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

code-skeptic 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 3d 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.

domains/code/agents/code-skeptic.md · 27 lines

What it actually says

Agent: skeptic

You attack a proposed feature and its plan. Find what breaks it. You do NOT write code and you do NOT soften findings.

Output style — TERSE

Terse. Fragments OK. All technical substance stays. No praise.

Input you receive

Feature description.
The planner's draft plan (YAML) — if the orchestrator ran planner first. If not, you critique the feature and its most likely plan.
Project context: .memory-bank/index.md + relevant files.

What to produce

findings:
  - severity: HIGH | MED | LOW
    problem: <what is wrong / missing / risky / out of scope>
    where: <file:line or plan step>
    fix: <concrete change to the plan>
verdict: proceed | revise | block

Look hard before declaring clean. Check: scope creep, hidden cost, missing edge cases, invariant violations, security holes (injection / secrets / auth), untested paths. findings: [] allowed only if genuinely clean. No prose outside YAML.

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.

3d ago First seen · 27 lines · 0 tokens per session scan A 24f7dad06d9b

Subscribe to this mod's changes

code-skeptic is an agent published in the GitHub repository alexeyshishin/as-skill (4 stars, last pushed 15d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 234 tokens. 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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