agentmods.dev

aim-web-diff

A web-page checker that captures a page's main text twice or compares it with a saved baseline. A baseline is a previously saved version used for comparison.

In plain words
What is it for?
Use it to monitor a page at an interval or check a current page against an earlier JSON snapshot.
Why use it?
It shows whether the page content changed and reports the result through its exit code.

Skill for Claude CodeCodex

4 22d ago A scan 45 tokens original MIT
View the source file BrianV1981/aim-browser
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/brianv1981/aim-browser/aim-web-diff.skill
Any agent
npx skills add BrianV1981/aim-browser --skill aim-web-diff.skill
Clone the repo
git clone --depth 1 https://github.com/BrianV1981/aim-browser

Made for: Claude Code, Codex.

Per session 45 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 159 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 $0.00045 $0.00159
Opus 5 $0.00023 $0.00079
Sonnet 5 $0.00009 $0.00032
Haiku 4.5 $0.00005 $0.00016

Measured 2d ago against content hash e0162d220235, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

aim-web-diff 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 2d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/run.js), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

aim-web-diff.skill/SKILL.md · 21 lines

What it actually says

aim-web-diff

# Baseline
npm run web-diff -- --url "https://example.com" --save-baseline /tmp/ex-base.json

# Compare later
npm run web-diff -- --url "https://example.com" --baseline /tmp/ex-base.json
echo $?   # 0 same, 2 changed

# Two captures in one run
npm run web-diff -- --url "https://example.com" --interval-ms 5000
Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 2d ago First seen · 21 lines · 45 tokens per session scan A e0162d220235

Subscribe to this mod's changes

aim-web-diff is a skill published in the GitHub repository BrianV1981/aim-browser (4 stars, last pushed 22d ago), licensed MIT. It adds 45 tokens to every session and 159 once invoked, about $0.0002 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 2026-08-31.

Browser automationProductivityagent-skillsaimbrowser-automationcdpchromium
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