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 still adds real behavioral context beyond them: the call is free with no API key, and an unknown tool name does not fail but returns the closest matching names — a fallback behavior an agent must know before interpreting a response.

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 with no filler, and the free/no-key note is front-loaded. The core content sentence is a bare noun list rather than a claim about what the tool does, which makes the opening read a little telegraphically, but nothing is wasted.

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?

With no output schema, the description carries the return-value burden and discharges it by enumerating the seven kinds of metadata returned. What is missing is positioning relative to the plan/run siblings, which matters for a discovery-style tool in this cluster.

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 coverage is 100% and the single parameter is documented as a tool name. The description goes further by showing accepted spellings ('eu_tenders or eu-tenders'), telling the agent name normalization is tolerated, and stating the recovery path for an unknown name — meaning the schema alone does not provide.

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 enumerates exactly what the tool returns for one named tool: input schema, example input, example rows, output fields, price per row, caps and sources. That is specific and resource-scoped, though it is written as a sentence fragment without an explicit verb and never contrasts itself with the sibling plan_official_records_query, which an agent could easily confuse with a discovery step.

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?

Use is only implied: 'Free, no key needed' plus a metadata payload suggests calling this to inspect a tool before using it. There is no explicit when-to-use, no mention of when to prefer plan_official_records_query or run_official_records_plan, and no statement of the ordering in the workflow.

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