certificate-checker

certificate-checker is a skill for Claude Code, Codex from fisker086/AIOps. It costs 14 tokens per session (125 once invoked), scanned A, original, Apache-2.0.

A checker for SSL/TLS certificates, the security credentials websites use to encrypt connections. It reports certificate dates, identity details, issuer, chain, and validity for a domain and port.

In plain words
What is it for?
Use it to check a domain's certificate expiry, issuer, subject, certificate chain, and validity, normally on port 443.
Why use it?
It helps detect expired, invalid, or incorrectly configured certificates before they interrupt secure connections. It can also show who issued a certificate and how it links to trusted certificates.

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/fisker086/aiops/cert_checker
Any agent
npx skills add fisker086/AIOps --skill cert_checker
Clone the repo
git clone --depth 1 https://github.com/fisker086/AIOps

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 certificate-checker

README.md
[![agentmods](https://agentmods.dev/badge/skills/fisker086/aiops/cert_checker.svg)](https://agentmods.dev/skills/fisker086/aiops/cert_checker)
Your own site
<a href="https://agentmods.dev/skills/fisker086/aiops/cert_checker"><img src="https://agentmods.dev/badge/skills/fisker086/aiops/cert_checker.svg" alt="Measured on agentmods" height="20"></a>
Per session 14 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 125 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 $0.00014 $0.00125
Opus 5 $0.00007 $0.00063
Sonnet 5 $0.00003 $0.00025
Haiku 4.5 $0.00001 $0.00013

Measured 5d ago against content hash 255102eb83b7, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

certificate-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 5d 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/cert_checker/SKILL.md · 21 lines

What it actually says

Certificate Checker Skill

Provides SSL/TLS certificate inspection:

  • Check certificate expiry date
  • View certificate issuer and subject
  • List certificate chain
  • Check certificate validity

Use builtin_cert_checker tool with fields:

  • domain: target domain to check (required)
  • port: (optional) port number (default: 443)

Note: Requires network access to the target domain.

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. 5d ago First seen · 21 lines · 14 tokens per session scan A 255102eb83b7

Subscribe to this mod's changes

certificate-checker is a skill published in the GitHub repository fisker086/AIOps (22 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 14 tokens to every session and 125 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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