Add Card Comparison Matrix Slide

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

Annotations already cover the safety profile (readOnlyHint=false, idempotentHint=true, destructiveHint=false). The description adds visual behavior (hero highlight, brand colors, conclusion footer) beyond that, which is genuinely useful, but it never says what happens at slide_number — whether an existing slide is overwritten or a new one is inserted — which is the key behavioral concern for a mutation tool.

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 well-formed sentence that front-loads the action (create a comparison slide) and then the visual characteristics. No filler, though the clause about brand colors is somewhat decorative rather than actionable.

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?

With 6 parameters at full schema coverage and no output schema, the definition is broadly callable, but for a tool that writes into a presentation file it omits whether presentation_path must already exist and whether slide_number inserts or overwrites. Those gaps matter 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 100%, so the schema already explains title, columns, is_hero, bottom_takeaway and slide_number. The description only loosely maps its layout narrative onto those fields and adds no syntax or formatting detail beyond them, so baseline 3 applies.

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 names a specific verb+resource: creating a multi-scenario comparison slide laid out as 2-4 column cards with a hero highlight, brand colors and a bottom takeaway. That is concrete enough to distinguish it from siblings like canva_add_swot_matrix or canva_add_process_timeline, though the differentiation is only implicit through the described layout rather than stated.

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 example 'E1-E4' implies the use case (comparing parameter scenarios side by side), giving implied usage guidance. There is no explicit when-to-use/when-not-to-use, no mention of the alternative matrix-style tools, and no prerequisites such as the target .pptx needing to exist.

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