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

With no annotations, the description carries full burden for behavioral disclosure. It reveals cost and tier requirement (positive) but omits other behaviors like processing time, image format limits, size constraints, or whether the operation is destructive. Partial transparency.

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?

Two concise sentences: first states core purpose, second adds cost and tier. No unnecessary words, front-loaded with key information. Efficient and scannable.

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?

The description covers purpose and essential constraints (cost, tier), but for a tool with no output schema and no annotations, it lacks details on return format, image constraints, error handling, or typical behavior. Adequate but not fully complete for an AI agent.

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 baseline is 3. The description does not add additional meaning to parameters beyond what the schema provides (e.g., media_url, prompt, optional mask_url). No extra context or examples are given.

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 clearly states the tool's action: 'Remove or replace objects in an image using AI inpainting.' It distinguishes itself from siblings like background_remove (removes backgrounds) and generate_image (creates new images), making its specific purpose immediate.

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 cost ($0.15) and access tier (Tier 1+), which inform usage decisions, but does not explicitly state when to use this tool versus alternatives like ai_edit or background_remove. Usage is implied but no exclusions or comparative guidance given.

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