PDF Thumbnails — Generate thumbnail preview images for each page of a PDF. [category: pdf]
| Name | Required | Description | Default |
|---|---|---|---|
| file | Yes | The PDF to preview. A 1-page input returns a bare JPEG instead of a ZIP — plan for both shapes. Password-protected = 400. | |
| quality | No | Thumbnail size: small=72dpi, medium=150dpi, large=300dpi. There is no 'width' parameter. | small |
Changes observed during successful MCP inspections. Dates show when Glama detected each change.
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The description does not disclose behavioral details such as output packaging, whether files are stored or returned directly, or failure modes. Key behavior like 'password-protected = 400' and '1-page input returns a bare JPEG' is present in the input schema but not in the description itself. The annotations are neutral false hints, so they do not meaningfully reduce the need for behavioral context.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The meaningful description is one focused sentence with the action front-loaded. The category tag is lightweight and not distracting. There is no redundant elaboration.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple two-parameter tool, the schema provides the necessary file input, quality options, and important output-shape warnings. The main gap is the absence of sibling-selection guidance, but that is already penalized under usage guidelines. Overall, an agent has enough information to invoke the tool correctly.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100%, so the schema already documents both parameters, including the quality enum values, DPI mapping, default, and the note that there is no 'width' parameter. The description adds no parameter semantics, but the high schema coverage supports the baseline score of 3.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description uses a specific verb and resource: 'Generate thumbnail preview images for each page of a PDF.' This clearly states what the tool does and its scope, and it differentiates the tool from sibling PDF operations like pdf_to_images or pdf_page_count.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
No guidance is given about when to use this tool versus related sibling tools such as pdf_to_images, pdf_extract_pages, or pdf_page_count. The description only states what the tool does and leaves tool selection entirely to inference.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Add one secure layer between your agents and this server.
Multiple tool pairs are near-identical: octopus_mkdir/octopus_make_folder and octopus_move/octopus_move_file are literal duplicates, analyze_hash/generate_hash both compute hashes, convert_word_to_pdf overlaps convert_document, and photo_compress/photo_compress_to_size plus pdf_thumbnails/pdf_to_images have fuzzy boundaries. The descriptions are detailed and cross-reference each other helpfully, but at 144 tools an agent will regularly misselect.
The dominant {category}_{verb}_{object} snake_case pattern (pdf_*, photo_*, convert_*, analyze_*, media_*) is largely consistent and predictable. However, outliers like chatwithyourpdf and describe_image break the category-prefix convention, and the octopus namespace mixes bare verbs (read, write, mkdir) with verb_noun forms (make_folder, move_file, search_meta) inconsistently.
144 tools is an extreme count for any MCP server. The broad scope (PDF, photo, video, audio, conversion, analysis, generation, file storage, web, e-sign) justifies some volume, but the count is inflated by batch and inspect variants (pdf_to_excel + batch + inspect), duplicate tools, and overlapping converters. An agent faces an overwhelming selection surface.
Per-domain coverage is remarkably deep: PDF spans merge/split/compress/protect/unlock/metadata/OCR/watermark and bidirectional conversion; photo covers editing, format conversion, face handling, OCR, and collage; file storage has full CRUD plus search. Minor gaps exist (no audio transcription, no video metadata editing, no deletion of PDF pages is actually covered via pdf_delete_pages) but the surface has no dead ends for its declared domains.
