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

Annotations already declare readOnlyHint=true, openWorldHint=false and destructiveHint=false. The description adds genuinely useful context beyond them: it is a live-data signal ranked by velocity, maps to a specific REST endpoint, and requires a free StartupHub.ai account (an auth prerequisite the agent would not otherwise know). Missing only rate-limit/pagination behavior.

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 tight sentences, front-loaded with purpose and output shape, then usage framing, then auth/endpoint notes. Every sentence carries weight, though the REST-endpoint equivalence is marginally useful for an agent.

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 two-param, read-only retrieval tool with no output schema, the description adequately conveys what is returned (companies ranked by velocity, with counts and links) and the account requirement, while annotations cover the safety profile. Pagination behavior is not addressed, keeping it below a 5.

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 limit (1–100, default 50) and period ('day'/'week'/'month') are fully documented in the schema. The description adds no syntax or format detail beyond that, 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+resource ('companies actively posting roles, ranked by open-role velocity') and describes the output shape (counts and links). The hiring-signal resource is unique among siblings like get_company_funding and get_trends, so an agent can tell it apart without opening a schema.

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?

Provides clear context for when to reach for it ('A growth/traction signal for deal-flow and sales prospecting'), which frames the intent. It does not name an alternative sibling or state exclusions, so it falls short of a 5.

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