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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, open world), so the bar is lower, yet the description adds real value beyond them: default sort order (newest first), the returned fields, and a cost model ('1 point per returned record'). It omits any note on result caps or pagination caveats.

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 dense sentence with no filler: data source and license, sort order, return fields, and billing are all front-loaded in one pass. Nothing could be removed without losing information.

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 usefully enumerates the returned fields and the newest-first ordering, and the billing note is important for an agent deciding how many records to pull. It stops short of explaining pagination interaction between start_page and max_items, which is the only meaningful gap.

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% with five documented parameters (to, from, country, max_items, start_page), so the schema carries parameter meaning. The description lists output fields rather than adding parameter syntax or constraints, so it sits at the baseline 3.

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 (Search) and resource (European startup exits and M&A), which cleanly separates it from the funding-round and company/investor siblings in the same Tech.eu family. It does not name those siblings explicitly, but the resource scope is unambiguous.

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?

Usage is implied by the resource ('Search European startup exits and M&A'), so an agent can infer when to reach for it, but there is no explicit when-to-use/when-not and no mention of the obvious alternative run_techeu_rounds_search for funding events rather than exits.

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