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

Annotations already declare readOnly=false, destructive=false, and openWorld=true. The description goes beyond them usefully by scoping the mutation ('only that slide is drawn again, with its text' — implying other slides and existing text survive) and by disclosing the cost model and a daily rate limit. It says nothing about failure modes or auth, which keeps it short of a 5.

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 tight sentence with the action first, then the blast-radius clarification, then the cost note. Every clause carries information an agent would otherwise have to guess.

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 mutating 5-parameter tool with no output schema, the description covers source, scope, and cost. The one real gap is what the call returns (the redrawn slide? a confirmation?), which matters slightly more here because no output schema exists to fill it in.

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 coverage is 100%, so every parameter is already documented, including the provenance notes ('from find_slide_photos', 'from get_slideshow'). The description reinforces the photo-source link but adds no syntax or format detail beyond the schema, 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 states a specific verb and resource ('put one of the photos ... on that slide') and pins the source of the input to the sibling tool find_slide_photos. This clearly separates it from find_slide_photos (search) and add_text_to_photo (text overlay).

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?

It establishes the prerequisite workflow: the photo must come from find_slide_photos, which tells the agent to call that tool first. It gives no explicit when-not-to-use case or alternative path, so the guidance is strong but not complete.

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