mantishack: Skill for Codex

.codex/skills/code-review-context/SKILL.md

code-review-context is a skill for Codex from deonmenezes/mantishack. It costs 7 tokens per session (142 once invoked), scanned A, a copy of code-review-context, Apache-2.0.

Rules for managing the context sent to a coding agent, meaning the history and other information included in its requests. They require the context to grow incrementally and stay within fixed size limits.

In plain words
What is it for?
Use them when adding conversation history or other information to agent requests. They define size limits, review thresholds, and the required structure for injected context.
Why use it?
They reduce unnecessary cache misses and prevent oversized or unlimited context from overwhelming the model. They also flag unusually large new pieces for manual review.

Skill for Codex

Written for Codex: installed under .codex/. Also seen: mentions Codex.

This is deonmenezes/mantishack's own configuration. It tells Codex how to work on mantishack itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything mantishack configures →

Reuse

Borrowing it

Nothing to install: this file belongs to deonmenezes/mantishack. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/deonmenezes/mantishack/main/.codex/skills/code-review-context/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/deonmenezes/mantishack

Made for: Codex.

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 code-review-context

README.md
[![agentmods](https://agentmods.dev/badge/skills/deonmenezes/mantishack/code-review-context/github.svg)](https://agentmods.dev/skills/deonmenezes/mantishack/code-review-context)
Your own site
<a href="https://agentmods.dev/skills/deonmenezes/mantishack/code-review-context"><img src="https://agentmods.dev/badge/skills/deonmenezes/mantishack/code-review-context/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.

agentmods 80×15 button for code-review-context

Your own site · 80×15
<a href="https://agentmods.dev/skills/deonmenezes/mantishack/code-review-context"><img src="https://agentmods.dev/badge/skills/deonmenezes/mantishack/code-review-context.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 7 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 142 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 100% copy Near-identical to another mod 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 $0.00007 $0.00142
Opus 5.5 $0.00003 $0.00057
Sonnet 5.5 $0.00001 $0.00028
Haiku 4.5 $0.00001 $0.00014

Measured 1mo ago against content hash 0af80b6388cc, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

code-review-context 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 1mo 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

This is a copy

100% identical to code-review-context — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.codex/skills/code-review-context/SKILL.md · 13 lines

What it actually says

Codex maintains a context (history of messages) that is sent to the model in inference requests.

  1. No history rewrite - the context must be built up incrementally.
  2. Avoid frequent changes to context that cause cache misses.
  3. No unbounded items - everything injected in the model context must have a bounded size and a hard cap.
  4. No items larger than 10K tokens.
  5. Highlight new individual items that can cross >1k tokens as P0. These need an additional manual review.
  6. All injected fragments must be defined as structs in core/context and implement ContextualUserFragment trait
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. 1mo ago First seen · 13 lines · 7 tokens per session scan A 0af80b6388cc

Subscribe to this mod's changes

code-review-context is a skill published in the GitHub repository deonmenezes/mantishack (504 stars, last pushed 18d ago), licensed Apache-2.0. It adds 7 tokens to every session and 142 once invoked, about $0.0000 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to code-review-context, differing in 0 lines, and is treated as a copy.