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

The description goes beyond the annotations by disclosing the fetch-and-host behavior, the returned asset_url, and the exact limits (5 assets, 100 MB total, 50 MB per file) plus the recommended fallback action (tell user to open project and sign in). This adds substantial context beyond the schema and annotations.

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 four efficient sentences, each carrying distinct information: what it does, why to use it, limit handling, and the project_id requirement. It is front-loaded with the main purpose and avoids fluff, achieving high information density.

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?

Given the tool's complexity (fetch and host, limits, return value) and the presence of an output schema, the description covers all essential decision-making aspects: purpose, rationale, constraints, and user guidance. It is complete for an agent to select and invoke the tool correctly.

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%, and the schema already provides detailed context for each parameter, especially project_id. The description adds only a brief 'Requires project_id' and mentions the asset_url return, but these are already implied or better explained in the schema. No significant extra semantic value.

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 fetches a remote media URL (image/video/audio) and hosts it on Clipkit, returning a stable asset_url. This specific verb-resource pairing distinguishes it from sibling tools like add_element, which adds elements rather than hosting assets.

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 explicitly says when to use this tool ('so the project's media survives') and provides reasoning (original link may rot, be private, or block hotlinking). It also gives operational guidance for limit handling, though it doesn't explicitly name alternatives or when not to use it.

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