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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so safety is covered by structured data. The description adds only the scoping qualifier "public," which is useful context but minor; nothing about lookup failure, visibility limits, or rate behavior is disclosed.

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?

A single front-loaded sentence with no filler; the operation and its scoping constraint are stated immediately.

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?

An output schema exists, so return values need not be described, and the lone parameter is fully covered by the schema and annotations. For a simple single-record lookup this is essentially complete, with only the source-of-ID linkage and not-found behavior left implicit.

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 single id parameter is well documented as "the numeric ID returned by search_breakthroughs." The description adds no meaning beyond what the schema already provides, so the baseline 3 applies.

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 (get) and resource (one public AI breakthrough) scoped by ID. It is clearly distinguishable from the entity-getting siblings by resource type, though it does not explicitly name its search counterpart search_breakthroughs as the source of the ID.

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?

"by ID" implies the tool is for retrieving a single known record, and the schema pins the ID to "returned by search_breakthroughs." However, there is no explicit when-to-use statement, no exclusions, and no mention of what to do if the ID is unknown — usage is inferred rather than stated.

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