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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds the useful behavioral fact that the result is a complete record including bilingual description, all source URLs and actors, but says nothing about what happens for an unknown id or about any rate/auth constraints. Additions beyond annotations are moderate, so a 3 fits.

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 terse sentence front-loads the most important information (one full record) before the field list, with no filler. It is phrased as a noun fragment rather than a verb phrase, which is slightly less direct than 'Return the full record of...' but not wasteful.

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 one-parameter read tool with full annotation coverage and an existing output schema, the description is essentially sufficient. It even summarizes the payload despite the output schema, with the only real gap being how to obtain a valid event_id.

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 event_id parameter is already documented in the schema, so the description adds no parameter meaning. Baseline 3 applies when the schema does the heavy lifting.

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 names the resource ('one risk event') and the scope of retrieval ('Full record'), and enumerates the fields returned, so an agent can tell this is a single-record fetch rather than a search. It never names search_events or event_stats, so differentiation from siblings is left implicit.

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?

There is no explicit when-to-use or when-not-to-use guidance; the agent must infer that this is called after an id is obtained from a search or list. The important precondition (the id must come from prior event results) appears only in the parameter schema, not in the description.

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