images_to_pdf

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It only states the basic creation action without mentioning whether output_path is overwritten, required permissions, file format constraints, or any side effects. This is insufficient for a tool that writes to disk, similar to the 'update_drive' example that received a 2.

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 description is a single concise sentence with no wasted words. It efficiently states the core purpose, though it skips other needed details. This is appropriately compact for the amount of information it provides, though not as informative as it could be.

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?

Despite the tool having 4 parameters and an output schema, the description covers only the basic conversion concept. It omits crucial context such as accepted image formats, default page_size and orientation, behavior when output_path exists, and any return values. The output schema exists but the description still lacks sufficient detail for correct invocation.

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 0%, yet the description adds no information about any of the four parameters (image_paths, output_path, page_size, orientation). It fails to explain valid values, defaults, or relationships, leaving the agent to rely solely on parameter names, which is not enough given the 0% coverage.

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 'Create PDF from multiple image files' clearly identifies the tool's function with a specific verb ('Create') and resource ('PDF'), plus the input source ('multiple image files'). This distinguishes it from siblings like merge_pdfs (combines existing PDFs) and pdf_to_images (converts PDFs to images), though it does not explicitly name alternatives.

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?

The description provides no guidance on when to use this tool versus alternatives. It does not mention prerequisites, exclusions, or conditions such as 'use this when you have image files rather than PDFs'. The usage is only implied by the phrase 'from multiple image files', with no explicit context or alternative comparisons.

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