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

Annotations already declare the mutation/safety profile (readOnlyHint=false, destructiveHint=false), so the bar is lower. The description adds that response_body is served as-is with JSON typical, but omits behavioral context like duplicate-route handling, whether the workspace must exist, or permission requirements.

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?

Three short sentences with the purpose and required inputs front-loaded; there is minor redundancy in re-listing required params already in the schema, but nothing is padded or buried.

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 15-parameter tool with four enums and a complex nested response_variants structure and no output schema, the description covers only the core create path. The schema carries the detail, so it is workable, but the description offers no guidance on variants, delays, auth simulation, or verification.

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 the schema already documents all 15 parameters, including defaults and constraints. The description merely restates the required fields and the route '/' constraint, adding no syntax or format meaning beyond what the schema provides.

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?

States a specific verb and resource ('Create a mock HTTP endpoint in a workspace'), which is clearly distinct in kind from sibling resources like create_folder and create_resource. However, it does not differentiate from bulk/import siblings such as scaffold_backend or import_openapi, which also produce endpoints.

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 describes the required inputs and how to place the endpoint in a folder, implying usage, but never states when to use create_endpoint versus import_openapi, scaffold_backend, or update_endpoint for modifications. No exclusions or prerequisites are given.

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