crw-watch

crw-watch is a skill for Claude Code from us/crw. It costs 81 tokens per session (2,183 once invoked), scanned A, original, AGPL-3.0.

A skill for comparing two saved web-page snapshots and reporting what changed. fastCRW is a stateless REST service, meaning each comparison is handled independently without built-in ongoing state.

In plain words
What is it for?
Use it to detect changes on web pages, monitor items such as pricing, compare weekly scrapes, and build scheduled alerts when content changes.
Why use it?
It removes the manual work of checking old and new page captures side by side. It can also form the comparison step in scheduled monitoring and alerting workflows.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Part of the fastcrw plugin — 15 skills, 2 MCP servers shipped together

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/us/crw/crw-watch
Any agent
npx skills add us/crw --skill crw-watch
Clone the repo
git clone --depth 1 https://github.com/us/crw

Made for: Claude Code.

Or install fastcrw, the plugin that ships this one along with the rest of its 15 skills, 2 MCP servers.

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 crw-watch

README.md
[![agentmods](https://agentmods.dev/badge/skills/us/crw/crw-watch.svg)](https://agentmods.dev/skills/us/crw/crw-watch)
Your own site
<a href="https://agentmods.dev/skills/us/crw/crw-watch"><img src="https://agentmods.dev/badge/skills/us/crw/crw-watch.svg" alt="Measured on agentmods" height="20"></a>
Per session 81 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,183 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
Origin unknown 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 5.1 $0.00081 $0.02183
Opus 5 $0.00041 $0.01092
Sonnet 5 $0.00016 $0.00437
Haiku 4.5 $0.00008 $0.00218

Measured 6d ago against content hash c8318d18ac37, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

crw-watch scanned grade A with 1 finding 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 6d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

allowed-tools: Bash(crw:*) Bash(curl:*) Read
skills/crw-watch/SKILL.md · 209 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

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. 6d ago First seen · 209 lines · 81 tokens per session scan A c8318d18ac37

Subscribe to this mod's changes

crw-watch is a skill published in the GitHub repository us/crw (950 stars, last pushed today), licensed AGPL-3.0. It adds 81 tokens to every session and 2,183 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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