create_image

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

With no annotations provided, the description carries the transparency burden. It discloses useful behavioral traits beyond the schema: auto-detection of dimensions and a 10MB size limit. It does not detail failure modes or return values, but the core behavior is transparent for a simple create operation.

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, front-loaded sentence with no wasted words. Every phrase adds information: action, target, source condition, automatic behavior, and size limit.

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 moderately simple tool with 6 parameters and no output schema, the description covers the essential context: what it does, where the image comes from, and key constraints. It doesn't explain returned data, but the absence of an output schema lowers that expectation.

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?

The schema already covers all 6 parameters with descriptions, so additional explanation is limited. The description adds the 10MB size constraint and implies width/height defaults, but mostly paraphrases the schema's 'default: original' for dimensions. It provides marginal semantic value beyond 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?

The description uses a specific verb and resource ('Add an image to a mural') and clearly states the source ('public URL'). It distinguishes create_image from sibling tools like create_sticky_notes or create_shapes by indicating it handles image placement specifically.

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 clear usage context: use this when adding an image from a public URL, with explicit constraints (must be public, max 10MB). It does not name alternatives or state when not to use it, but the sibling tools are clearly different in purpose.

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