A hosted tool for inspecting and filling PDF forms, locating signature fields, adding a visible signature stamp after confirmation, and flattening a reviewed document. A PDF is a fixed-layout document format commonly used for forms.

Use it to work with supplied PDF forms, find where to sign, return a signed or flattened PDF, and handle documents within the stated size and page limits.

It provides a defined way to handle supplied PDFs while making clear that documents must be sent to the hosted service and that encrypted PDFs are not supported.

pdf-forms — Skill for Claude Code and Codex by Open-Document-Alliance

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 Open-Document-Alliance/PDF-Tools --skill pdf-forms

Clone the repo

git clone --depth 1 https://github.com/Open-Document-Alliance/PDF-Tools

Made for: Claude Code, 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/open-document-alliance/pdf-tools/pdf-forms/github.svg)](https://agentmods.dev/skills/open-document-alliance/pdf-tools/pdf-forms)

Your own site

<a href="https://agentmods.dev/skills/open-document-alliance/pdf-tools/pdf-forms"><img src="https://agentmods.dev/badge/skills/open-document-alliance/pdf-tools/pdf-forms/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/open-document-alliance/pdf-tools/pdf-forms"><img src="https://agentmods.dev/badge/skills/open-document-alliance/pdf-tools/pdf-forms.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 37 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 615 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.

Model	Per session	Once invoked
Fable 5.1	$0.00037	$0.00615
Opus 5.5	$0.00015	$0.00246
Sonnet 5.5	$0.00007	$0.00123
Haiku 4.5	$0.00004	$0.00061

Measured 16d ago against content hash 96ce5ad50e9b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

pdf-forms 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 16d 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.

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.

plugins/pdf-forms/skills/pdf-forms/SKILL.md · 57 lines

How it starts

The opening of the file, as written. The whole thing — 57 lines — stays where its author put it; the contents beside it link to each section on GitHub.

PDF Forms

Use the configured pdf-forms MCP server. This is the hosted five-tool edition, not the full local PDF Tools application. It provides no local file access, viewer, saved profiles, extraction workspace, or Lumin signing.

Supply and return the PDF

Each call requires the PDF as pdf_url or pdf_base64, never both. Only send a document the user has supplied for this task and knows will be processed by the hosted service. Never upload a private document to another service to obtain a public URL. Do not invent document URLs, field values, or attachment access. If the host cannot provide the PDF bytes or an authorized URL, explain that limitation and request a supported input. Do not claim to have opened it.

Inline input is limited to 3 MB, fetched PDFs to 25 MB, and documents to 200 pages. Returned PDFs are inline base64, with host transfer limits. Encrypted PDFs are refused. PDF Tools does not store the documents; content returned to the assistant is governed by the host's data terms.

Use the host's supported file-output mechanism for returned PDF bytes. Never present base64 as a download link or invent a file. If the host cannot produce an accessible output file, state that the output handoff is unsupported.

Fill and verify

Call read_form_fields and use exact field names from its result.
Ask for missing values. Do not guess what a coded field represents.
Call fill_form with only the user's supplied values.
Check both filled and not_filled, and read back the returned PDF to confirm its field values. Report every unfilled or unsupported field.
Never claim the form is complete, accurate, legally valid, or ready to submit just because filling succeeded.

Signature stamps

Call detect_signature_zones first and preserve its top-left coordinates. Before apply_signature, obtain the person's name and their own statement confirming intent to apply the visible stamp. Preserve the exact statement and the time of their actual confirmation. Never invent either required field. The statement must be recent, and an earlier unrelated approval is not consent. Clearly explain that a visible stamp is not a cryptographic signature or a Lumin signing request. A request to inspect or fill is not permission to sign.

Read the full file on GitHub · 57 lines

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.

16d ago First seen · 57 lines · 37 tokens per session scan A 96ce5ad50e9b

Subscribe to this mod's changes

pdf-forms is a skill published in the GitHub repository Open-Document-Alliance/PDF-Tools (158 stars, last pushed 2d ago), licensed MIT. It adds 37 tokens to every session and 615 once invoked, about $0.0001 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 2026-10-07.

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