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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so "Read-only" adds nothing. The description does add real value with the data-fidelity caveat that status is "as the calendar reports it" and a past confirmed event is not proof a meeting occurred; however it omits defaults for the time window, timezone handling, and pagination/limit 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?

Purpose is front-loaded in the first sentence, the caveat follows, and the trailing "Read-only." plus agent_name instruction are short. Slight waste in restating the annotation-provided read-only nature, but overall tight.

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?

Output schema exists, so return values needn't be explained, and the interpretation caveat is a nice touch. But for a 6-parameter tool with wide-open inputs and no required fields, the description leaves the agent guessing about the time window semantics, defaults, and what companyId/connectionId scope.

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 only 17% (only the nested connectionId is documented), so the description must compensate and largely does not. It mentions agent_name explicitly and gestures at a "time window" (from/to), but companyId, maxResults, and connectionId remain undocumented, and the from/to direction and defaults are unstated.

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 and resource ("Lists the company's connected calendar events") plus the returned fields, so an agent knows exactly what it gets. It does not, however, distinguish itself from the similarly named sibling connection_list_connection_events or connection_list_luma_events, both of which could plausibly return events.

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?

"Look for post-meeting evidence before recording one" implies the intended usage context (verifying meetings before recording), and "Pass your agent_name" is a directive. But there is no explicit when-to-use/when-not guidance and no routing to an alternative tool for overlapping event data.

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