FreeDailyPro PDF Tools

pdf_compress_size

Read-onlyIdempotent

Shrink a PDF from freedailypro to a size you need, such as under 2 MB for an email or a portal (the site's File size mode). The same steps as Balanced, Aggressive and Extreme, gentlest first, stopping at the first one that fits. If the goal cannot be reached it finishes every allowed step and returns the smallest file with targetMet: false and limitReason. limit caps how far it may go (balanced keeps text selectable). Heavy at the stronger limits; returns the best level so far (truncated: true) if the time budget runs out. A PDF already under the goal is returned unchanged.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "fileBase64": "<fileBase64>",
      "targetSize": "<targetSize>"
    },
    "name": "pdf_compress_size"
  }
}

Input Schema

Name	Required	Description
`limit`	No	How far the steps may go. Default extreme. balanced = text stays selectable; aggressive = pages may become pictures; extreme = greyscale and black-and-white too
`fileBase64`	Yes	The PDF, base64 encoded (up to 20 MB, up to 100 pages)
`targetSize`	Yes	The size to reach: a number of bytes, or text such as 2MB or 500KB

Schema Changelog

Changes observed during successful MCP inspections.

AddedOct 28, 2026

TDQS

A3.8/5.0

Behavior4/5

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

Annotations already declare the operation as read-only, idempotent, and non-destructive. The description adds valuable behavioral context: what happens on failure (targetMet: false, limitReason), timeout behavior (truncated: true), and that files already under the goal are returned unchanged, though it does not cover auth or rate limits.

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

Conciseness4/5

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

The description is front-loaded with the core purpose and then explains mechanics, failure modes, and edge cases in a dense but efficient manner. It could be slightly tighter, but every sentence contributes.

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

Completeness5/5

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

Given the tool's complexity (iterative compression, target size, timeout handling) and the absence of an output schema, the description thoroughly explains what the tool does and what it returns under various conditions, leaving no critical gaps for an agent to call it correctly.

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 coverage is 100%, so the schema already fully documents all three parameters. The description adds minor reinforcement (e.g., that `limit` caps how far it may go and that balanced keeps text selectable), but this largely repeats the schema, so baseline 3 is appropriate.

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

Purpose4/5

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

States a specific verb (Shrink) and resource (a PDF) with the goal of reaching a target size, and differentiates itself from fixed-mode siblings by describing iterative steps. However, it does not explicitly name a sibling to use instead for fixed compression, so an agent must infer the routing.

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?

The use case is implied (when you have a specific size target like under 2 MB), but the description lacks explicit when-to-use vs. when-not-to-use guidance or direct alternatives to the other pdf_compress tools.

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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