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

With no annotations, the description fully discloses behavior: read-only, deterministic, idempotent, and the exact return format (plain-text string with a fenced tsx code block). It also clarifies that no parameters are needed and the endpoint path is fixed, providing transparency about internal assumptions.

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 concise yet complete, structured into clear sections (purpose, when to use, return format). Every sentence adds useful information with no redundancy or filler.

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 tool with no parameters and no output schema, the description provides all necessary context: what it does, when to use it, what it returns, and its safety profile. It is fully self-contained and leaves no significant gaps.

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 tool has zero parameters, so the baseline is 4, but the description adds meaningful context by explaining why no parameters are needed: 'the endpoint path is always /api/uploadkit since that is what scaffold_route_handler produces.' This goes beyond the empty 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 states it returns a snippet wrapping the Next.js root layout with <UploadKitProvider> for React components to talk to the upload route handler. This is specific and distinguishes it from scaffold_route_handler, which generates the route handler itself.

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?

Explicitly says 'When to use: right after scaffold_route_handler' and explains the consequence of not using it ('UploadKit React components throw at runtime'). This gives clear context and implicitly excludes use before the route handler exists.

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