validator-agent

validator-agent is a skill for Claude Code, Codex from 7oSkaaa/polygon-problems-generator. It costs 26 tokens per session (259 once invoked), scanned A, original, MIT.

A tool for writing and improving input-checking programs for competitive programming problems. These programs use testlib.h, a C++ library for checking whether submitted test data follows the required format.

In plain words
What is it for?
Use it to create or refine Polygon validators, which are programs that verify contest input files. It helps check values, whitespace, line endings, end-of-file, and constraints such as sums.
Why use it?
It helps prevent invalid test cases, formatting mistakes, and missing boundary checks in contest problems. It also keeps the validator's output focused on complete C++ code.

Skill for Claude CodeCodex

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 skills/7oskaaa/polygon-problems-generator/validator-agent
Any agent
npx skills add 7oSkaaa/polygon-problems-generator --skill validator-agent
Clone the repo
git clone --depth 1 https://github.com/7oSkaaa/polygon-problems-generator

Made for: Claude Code, 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 validator-agent

README.md
[![agentmods](https://agentmods.dev/badge/skills/7oskaaa/polygon-problems-generator/validator-agent.svg)](https://agentmods.dev/skills/7oskaaa/polygon-problems-generator/validator-agent)
Your own site
<a href="https://agentmods.dev/skills/7oskaaa/polygon-problems-generator/validator-agent"><img src="https://agentmods.dev/badge/skills/7oskaaa/polygon-problems-generator/validator-agent.svg" alt="Measured on agentmods" height="20"></a>
Per session 26 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 259 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 $0.00026 $0.00259
Opus 5 $0.00013 $0.00130
Sonnet 5 $0.00005 $0.00052
Haiku 4.5 $0.00003 $0.00026

Measured 4d ago against content hash a51c10382673, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

validator-agent 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/skills/validator-agent/SKILL.md · 27 lines

What it actually says

Read .claude/shared.md first.

You are an expert competitive programming problem setter specialising in writing Polygon validators using testlib.h.

Shared: Read .claude/shared.md first.

Apply the validator guidance from tutorials/polygon-hints.md, especially named reads, fixed-length token formats, global constants for bounds, and immediate checks for sum constraints after reading each test case.

Key Rules

  • Always include #include "testlib.h" and registerValidation(argc, argv)
  • Validate whitespace and newlines strictly: readSpace, readEoln, readEof
  • Use named variables in all inf.read*() calls
  • Reject trailing spaces — check whitespace precisely after every value
  • Use digit-separator constants: 100'000 not 100000
  • End with inf.readEof()
  • Compile with cpp17, no warnings

Return only the complete C++ code, no explanation.

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 · 27 lines · 26 tokens per session scan A a51c10382673

Subscribe to this mod's changes

validator-agent is a skill published in the GitHub repository 7oSkaaa/polygon-problems-generator (21 stars, last pushed 4d ago), licensed MIT. It adds 26 tokens to every session and 259 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 2026-08-30.

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