add_mark

A small utility for adding text watermarks to PDF files. A watermark is visible text placed on a document, such as “Confidential.”

In plain words
What is it for?
Use it to add labels such as confidentiality notices to PDFs and save the watermarked file under a chosen name and location.
Why use it?
It avoids having to handle PDF editing details manually when a document needs a simple text mark.

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/coderwanfeng/python-office/add_mark
Any agent
npx skills add CoderWanFeng/python-office --skill add_mark
Clone the repo
git clone --depth 1 https://github.com/CoderWanFeng/python-office

Made for: Claude Code, Codex.

Per session 28 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 347 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 $0.00028 $0.00347
Opus 5 $0.00014 $0.00173
Sonnet 5 $0.00006 $0.00069
Haiku 4.5 $0.00003 $0.00035

Measured yesterday against content hash 00573fa1bdad, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

add_mark 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 yesterday.

The scan reads SKILL.md. This mod also ships 1 executable file (__init__.py), 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.

skills/pdf/add_mark/SKILL.md · 56 lines

What it actually says

add_mark Skill

给 PDF 添加水印

功能描述

向 PDF 文件添加文字水印。

所属分类

office/skills/pdf/add_mark/

调用方式

from skills.pdf import add_mark

add_mark(
    input_file='./test.pdf',
    mark_str='python-office',
    output_path='./',
    output_file='watermarked.pdf'
)

参数说明

参数 类型 必填 默认值 说明
input_file str - PDF 文件的位置,例如 d:/code/programmer.pdf
mark_str str - 需要添加的水印内容,例如 "python-office"
output_path str - 保存文件的位置
output_file str - 指定添加了水印的文件名称
pdf_file str - [已弃用] 请使用 input_file
output_file_name str - [已弃用] 请使用 output_file

返回值

None

使用示例

from skills.pdf import add_mark
add_mark(input_file='./report.pdf', mark_str='机密')

原始函数

office.api.pdf.add_mark

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. yesterday First seen · 56 lines · 28 tokens per session scan A 00573fa1bdad

Subscribe to this mod's changes

add_mark is a skill published in the GitHub repository CoderWanFeng/python-office (1,346 stars, last pushed 12d ago), licensed Apache-2.0. It adds 28 tokens to every session and 347 once invoked, about $0.0001 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 2026-08-30.

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