What is insecure-deserialization-checker?

A security checker for insecure deserialization, a vulnerability that can occur when an application rebuilds objects from untrusted data.

Use it to review code and configurations for insecure deserialization and related secure-coding concerns.

It helps find a class of security problem that can lead to unsafe application behavior.

insecure-deserialization-checker — Skill for Claude Code by DamingDong

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 DamingDong/opencode-skills-hub --skill insecure-deserialization-checker

Clone the repo

git clone --depth 1 https://github.com/DamingDong/opencode-skills-hub

Made for: Claude Code.

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/skills/damingdong/opencode-skills-hub/insecure-deserialization-checker/github.svg)](https://agentmods.dev/skills/damingdong/opencode-skills-hub/insecure-deserialization-checker)

Your own site

<a href="https://agentmods.dev/skills/damingdong/opencode-skills-hub/insecure-deserialization-checker"><img src="https://agentmods.dev/badge/skills/damingdong/opencode-skills-hub/insecure-deserialization-checker/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/damingdong/opencode-skills-hub/insecure-deserialization-checker"><img src="https://agentmods.dev/badge/skills/damingdong/opencode-skills-hub/insecure-deserialization-checker.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 74 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 450 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	$0.00074	$0.00450
Opus 5.5	$0.00030	$0.00180
Sonnet 5.5	$0.00015	$0.00090
Haiku 4.5	$0.00007	$0.00045

Measured 2mo ago against content hash 3d6add793485, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

insecure-deserialization-checker 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 2mo 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.

skills/community/insecure-deserialization-checker/SKILL.md · 73 lines

What it actually says

Insecure Deserialization Checker

Overview

This skill provides automated assistance for insecure deserialization checker tasks within the Security Fundamentals domain.

When to Use

This skill activates automatically when you:

Mention "insecure deserialization checker" in your request
Ask about insecure deserialization checker patterns or best practices
Need help with essential security skills covering authentication, input validation, secure coding practices, and basic vulnerability detection.

Instructions

Provides step-by-step guidance for insecure deserialization checker
Follows industry best practices and patterns
Generates production-ready code and configurations
Validates outputs against common standards

Examples

Example: Basic Usage Request: "Help me with insecure deserialization checker" Result: Provides step-by-step guidance and generates appropriate configurations

Prerequisites

Relevant development environment configured
Access to necessary tools and services
Basic understanding of security fundamentals concepts

Output

Generated configurations and code
Best practice recommendations
Validation results

Error Handling

Error	Cause	Solution
Configuration invalid	Missing required fields	Check documentation for required parameters
Tool not found	Dependency not installed	Install required tools per prerequisites
Permission denied	Insufficient access	Verify credentials and permissions

Resources

Official documentation for related tools
Best practices guides
Community examples and tutorials

Part of the Security Fundamentals skill category. Tags: security, authentication, validation, owasp, secure-coding

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.

2mo ago First seen · 73 lines · 74 tokens per session scan A 3d6add793485

Subscribe to this mod's changes

insecure-deserialization-checker is a skill published in the GitHub repository DamingDong/opencode-skills-hub (12 stars, last pushed 9mo ago), licensed MIT. It adds 74 tokens to every session and 450 once invoked, about $0.0003 per session on Opus 5.5. 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 2026-09-03.