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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds only "Stateless", which is a genuine extra (nothing is persisted), but it says nothing about what the explanation contains, whether malformed payloads produce errors or diagnostics, or how opaque/unknown design shapes are handled.

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 short, front-loaded sentences with no filler or repetition. It is efficient, though the brevity is partly the cause of the missing detail rather than purely a virtue.

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?

No output schema exists, so the description is the only place the response shape could be described, and it says nothing about it. Combined with an opaque nested input object at 0% coverage and no annotation-independent behavioral detail, the definition is not complete enough for reliable invocation.

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 0% and the single required parameter is an unconstrained nested object, so the description carries the full burden. "design_project payload" hints at the expected shape, but it never enumerates fields, required keys, or the expected structure of the nested object, leaving an agent with no way to construct a valid `design` value from the definition.

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?

"Explain" + "design_project payload" gives a verb and a resource, but "explain" is ambiguous: it doesn't say whether the output is a validation report, a human-readable summary, a field-by-field walkthrough, or an error diagnosis. It also doesn't distinguish itself from the sibling design_project tool, so an agent cannot tell which to pick from the description alone.

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 says the payload is "supplied by the client" and that the tool is stateless, which hints at the input's origin but never states when to call this instead of design_project or project_intake. There are no exclusions and no conditions that select this tool over its siblings.

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