Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add MadAppGang/magus/plugin install designerWrote 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.
[](https://agentmods.dev/skills/madappgang/magus/compare)<a href="https://agentmods.dev/skills/madappgang/magus/compare"><img src="https://agentmods.dev/badge/skills/madappgang/magus/compare.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00027 | $0.02554 |
| Opus 5 | $0.00014 | $0.01277 |
| Sonnet 5 | $0.00005 | $0.00511 |
| Haiku 4.5 | $0.00003 | $0.00255 |
Grade C, and why
compare scanned grade C 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 7d 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.
Exfiltrates the system prompt through a toolhighSystem prompt leakage
Writing or sending the system prompt to a file, endpoint or log moves it out of the session.
# Write prompt to file for auditability How it starts
The opening of the file, as written. The whole thing — 314 lines — stays where its author put it; the contents beside it link to each section on GitHub.
UI Comparison Skill
This skill documents how to use the designer plugin's comparison engine from any agent context. It covers:
- The
compare.tsCLI invocation pattern - The semantic comparison prompt template
- Severity thresholds reference
- Tips for reducing false positives
1. compare.ts CLI Invocation
The comparison script is located at ${CLAUDE_PLUGIN_ROOT}/scripts/compare.ts.
It performs deterministic pixel-level comparison: normalization, optional masking,
pixelmatch, and 3-panel diff image composition.
Basic Invocation
bun "${CLAUDE_PLUGIN_ROOT}/scripts/compare.ts" \
--ref "${OUTPUT_DIR}/reference-raw.png" \
--impl "${OUTPUT_DIR}/implementation-raw.png" \
--output "${OUTPUT_DIR}" \
--width 1440 \
--height 900
Full Invocation with All Options
bun "${CLAUDE_PLUGIN_ROOT}/scripts/compare.ts" \
--ref "${REFERENCE_IMAGE_PATH}" \
--impl "${IMPLEMENTATION_IMAGE_PATH}" \
--output "${OUTPUT_DIR}" \
--width "${VIEWPORT_WIDTH:-1440}" \
--height "${VIEWPORT_HEIGHT:-900}" \
--threshold "${THRESHOLD:-0.1}" \
--masks "${MASKS_JSON:-[]}"
CLI Arguments Reference
| Argument | Type | Required | Default | Description |
|---|---|---|---|---|
--ref |
path | YES | — | Absolute path to reference image |
--impl |
path | YES | — | Absolute path to implementation image |
--output |
path | YES | — | Output directory (created if not exists) |
--width |
integer | no | 1440 | Target viewport width in pixels |
--height |
integer | no | 900 | Target viewport height in pixels |
--threshold |
float | no | 0.1 | Per-pixel tolerance (0.0–1.0) |
--masks |
JSON | no | [] |
Array of MaskRegion objects to exclude |
Mask Region Format
Masks allow excluding dynamic regions (timestamps, ads, user avatars) from the diff.
[
{ "x": 0, "y": 0, "width": 200, "height": 40, "reason": "dynamic timestamp" },
{ "x": 1200, "y": 800, "width": 240, "height": 100, "reason": "user avatar" }
]
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.
- 7d ago First seen · 314 lines · 27 tokens per session scan C 30c4dc257f7d
compare is a skill published in the GitHub repository MadAppGang/magus (9 stars, last pushed 2d ago), licensed MIT. It adds 27 tokens to every session and 2,554 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it C with 1 finding (exfiltrates the system prompt through a tool). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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