Export Slide Thumbnail to PNG

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

Annotations already declare readOnlyHint=false, idempotentHint=true and destructiveHint=false, so the safety profile is covered. The description adds real value beyond that by disclosing the concrete side effect (a PNG file written to the Artifacts folder) and the output resolution. It does not say what happens if output_path already exists, whether the default folder is auto-created, or what the call returns.

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?

A single sentence that front-loads the action verb and packs resource, format, resolution, destination and purpose with no filler. It is dense and slightly run-on, but nothing in it is wasted.

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 3-parameter tool with full schema coverage and no output schema, the description covers what it produces and where. The gap is the return value: with no output schema, an agent cannot know whether the tool returns the saved path, the image data, or nothing, and nothing about failure modes is given.

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 every parameter is already documented, establishing a baseline of 3. The description contributes extra context by tying the Artifacts destination to the optional output_path and by fixing the default resolution, but adds no format or syntax detail beyond the schema.

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?

States a specific verb+resource: render one slide from a PPTX file into a high-resolution PNG (1920x1080) and save it to the Artifacts folder. The singular 'một slide' implicitly separates it from canva_export_presentation_deck, but no sibling is named explicitly, so differentiation requires inference.

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 stated purpose ('để xem trước trực tiếp' – for direct preview) implies when to use it, i.e. quick single-slide previews. However, it never says when to prefer canva_export_presentation_deck instead, nor any prerequisites such as the PPTX needing to exist or slide_number needing to be in range.

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