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PurpleDirective

quillpdf-mcp

Count PDF pages

pdf_page_count
Read-onlyIdempotent

Get the page count of any PDF without sending the file anywhere — all processing occurs on your local machine.

Instructions

Return the number of pages in a PDF. Runs entirely on this machine — the file is read and written locally and never sent anywhere.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
inputYesPath to the input PDF

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
pagesYes
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already cover readOnlyHint and idempotentHint; description adds that execution is local with no data sent externally, providing useful privacy context beyond annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two short sentences, front-loaded with purpose, no redundant words.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Sufficient for a simple tool with one parameter and an output schema; could mention return type but not essential.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema has 100% description coverage for the single parameter; description does not add extra meaning beyond 'Path to the input PDF'.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Clearly states 'Return the number of pages in a PDF'—specific verb and resource that distinguishes it from sibling tools like pdf_merge or pdf_split.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Description implies usage for local, private page counting but does not explicitly state when to use this tool over alternatives or exclude other cases.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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