blogwatcher

blogwatcher is a skill for Claude Code, Codex from JansenAnalytics/claudex. It costs 20 tokens per session (421 once invoked), scanned A, a copy of blogwatcher, MIT.

A command-line tool for tracking blogs and RSS/Atom feeds, which are standard update lists published by websites.

In plain words
What is it for?
Add or remove blogs, scan for new posts, list saved articles, and mark articles as read.
Why use it?
It keeps new articles from multiple blogs in one place, so you do not need to check each site manually.

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/jansenanalytics/claudex/blogwatcher
Any agent
npx skills add JansenAnalytics/claudex --skill blogwatcher
Clone the repo
git clone --depth 1 https://github.com/JansenAnalytics/claudex

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 blogwatcher

README.md
[![agentmods](https://agentmods.dev/badge/skills/jansenanalytics/claudex/blogwatcher.svg)](https://agentmods.dev/skills/jansenanalytics/claudex/blogwatcher)
Your own site
<a href="https://agentmods.dev/skills/jansenanalytics/claudex/blogwatcher"><img src="https://agentmods.dev/badge/skills/jansenanalytics/claudex/blogwatcher.svg" alt="Measured on agentmods" height="20"></a>
Per session 20 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 421 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 89% 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 $0.00020 $0.00421
Opus 5 $0.00010 $0.00211
Sonnet 5 $0.00004 $0.00084
Haiku 4.5 $0.00002 $0.00042

Measured 3d ago against content hash 0d66db462799, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

blogwatcher 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.

Origin

This is a copy

89% identical to blogwatcher — 3 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.

skills/blogwatcher/SKILL.md · 73 lines

What it actually says

blogwatcher

Track blog and RSS/Atom feed updates with the blogwatcher CLI.

Install

  • Go: go install github.com/Hyaxia/blogwatcher/cmd/blogwatcher@latest

Quick start

  • blogwatcher --help

Common commands

  • Add a blog: blogwatcher add "My Blog" https://example.com
  • List blogs: blogwatcher blogs
  • Scan for updates: blogwatcher scan
  • List articles: blogwatcher articles
  • Mark an article read: blogwatcher read 1
  • Mark all articles read: blogwatcher read-all
  • Remove a blog: blogwatcher remove "My Blog"

Example output

$ blogwatcher blogs
Tracked blogs (1):

  xkcd
    URL: https://xkcd.com
$ blogwatcher scan
Scanning 1 blog(s)...

  xkcd
    Source: RSS | Found: 4 | New: 4

Found 4 new article(s) total!

Notes

  • Use blogwatcher <command> --help to discover flags and options.
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. 3d ago First seen · 73 lines · 20 tokens per session scan A 0d66db462799

Subscribe to this mod's changes

blogwatcher is a skill published in the GitHub repository JansenAnalytics/claudex (5 stars, last pushed 2mo ago), licensed MIT. It adds 20 tokens to every session and 421 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 89% identical to blogwatcher, differing in 3 lines, and is treated as a copy.

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