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compress-image

compress-image is a skill for Codex from tranfu-labs/tranfu-skills. It costs 107 tokens per session (1,249 once invoked), scanned A, original, MIT.

A local image-compression tool for PNG, JPEG, and WebP files. It can produce WebP files or lossless PNG files.

In plain words
What is it for?
Compressing one local image or a local directory, converting supported images to WebP or PNG, and optimizing files for smaller storage or transfer size.
Why use it?
It reduces image file size while keeping the original source files by default. It also avoids treating unsupported formats, remote URLs, resizing, cropping, or retouching as compression tasks.

Skill for Codex

Written for Codex: agents/openai.yaml present.

not rated 2repo 24d ago A scan 107 tokens original MIT

Good fit Compressing one local image or a local directory, converting supported images to WebP or PNG, and optimizing files for smaller storage or transfer size.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/tranfu-labs/tranfu-skills/compress-image
View source ↗ tranfu-labs/tranfu-skills
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.

Any agent
npx skills add tranfu-labs/tranfu-skills --skill compress-image
Clone the repo
git clone --depth 1 https://github.com/tranfu-labs/tranfu-skills

Made for: 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 compress-image

README.md
[![agentmods](https://agentmods.dev/badge/skills/tranfu-labs/tranfu-skills/compress-image/github.svg)](https://agentmods.dev/skills/tranfu-labs/tranfu-skills/compress-image)
Your own site
<a href="https://agentmods.dev/skills/tranfu-labs/tranfu-skills/compress-image"><img src="https://agentmods.dev/badge/skills/tranfu-labs/tranfu-skills/compress-image/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for compress-image

Your own site · 80×15
<a href="https://agentmods.dev/skills/tranfu-labs/tranfu-skills/compress-image"><img src="https://agentmods.dev/badge/skills/tranfu-labs/tranfu-skills/compress-image.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 107 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,249 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00107 $0.01249
Opus 5.5 $0.00043 $0.00500
Sonnet 5.5 $0.00021 $0.00250
Haiku 4.5 $0.00011 $0.00125

Measured 2mo ago against content hash fd06ae6d5b31, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

compress-image 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 2mo ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/main.mjs), 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.

own-skills/compress-image/SKILL.md · 108 lines

How it starts

The opening of the file, as written. The whole thing — 108 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Compress Image

Compress one local image or a local directory with the bundled deterministic CLI. MUST keep source files by default. NEVER replace or delete a source unless the user explicitly authorizes replacement.

Runtime contract

  • MUST require Node.js 18.17 or newer and npm on PATH.
  • MUST treat the directory containing this file as SKILL_ROOT.
  • MUST run <SKILL_ROOT>/scripts/main.mjs; NEVER recreate the compression logic in an ad hoc command.
  • MUST allow the script to install the pinned Sharp runtime into the user's cache on first use. Installation diagnostics go to stderr; JSON results remain on stdout.
  • MUST accept only static .png, .jpg, .jpeg, and .webp inputs. NEVER download remote URLs or convert unsupported formats on the user's behalf.

Workflow

CREATE A TODO LIST FOR THE TASKS BELOW, then execute the steps in order.

  1. Resolve exactly one local input path. If the request has no path, has multiple ambiguous paths, points to a URL, or requests an unsupported format or editing operation, stop and request a supported local file or directory.

  2. Choose CLI options from the user's request:

    • Default to WebP at quality 80 and keep the source.
    • Use --format png for PNG output and do not pass --quality; PNG output is lossless.
    • Add --recursive only when the user explicitly asks to include subdirectories.
    • Add --replace only when the user explicitly authorizes replacing the source files.
    • Use --output only for one file, never for a directory, and never together with --replace.

  3. Run the CLI with an absolute input path and --json:

    node "<SKILL_ROOT>/scripts/main.mjs" "/absolute/input" --format webp --quality 80 --json

  4. Inspect the exit status and JSON. If the exit status is nonzero or failures is non-empty, report both successful and failed files and do not claim complete success.

  5. Verify every reported output path exists. For cross-format --replace, also verify that the original path no longer exists. If either verification fails, report the missing or unexpected path and stop with failure. Otherwise report the absolute output paths, before/after byte counts, and savedPercent, then end.

Read the full file on GitHub · 108 lines

Files

What ships with it

8 files 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. 2mo ago First seen · 108 lines · 107 tokens per session scan A fd06ae6d5b31

Subscribe to this mod's changes

compress-image is a skill published in the GitHub repository tranfu-labs/tranfu-skills (2 stars, last pushed 24d ago), licensed MIT. It adds 107 tokens to every session and 1,249 once invoked, about $0.0004 per session on Opus 5.5. 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.

Creative and media
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