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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint, so the safety profile is covered. The description adds that results are scoped to the caller's own matches and include intros/expiry/message URLs, but says nothing about pagination, result caps, or auth requirements beyond what the schema notes.

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 short, front-loaded sentence with no filler. It is arguably over-terse — terms like 'intros' and 'expiry' are domain jargon left unexplained — 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?

The tool is simple (one optional param, no output schema), so the description's main remaining burden is hinting at return shape, which it does minimally via 'intros, expiry and message URLs'. It omits what a 'match' is, ordering, and result limits, leaving real gaps for an agent with no output schema to consult.

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?

Only one optional parameter exists and the schema documents it at 100% coverage, including when the api_key fallback is needed. The description adds nothing beyond the schema, so the baseline of 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?

The description identifies the resource (the caller's matches) and enumerates the returned content (intros, expiry, message URLs), which is more specific than the title alone. The verb is only implied by the tool name, and there is no explicit differentiation from siblings like get_match_receipt or list_match_messages.

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 statement of when to call this tool, when not to, or which sibling to use instead. An agent must infer from the name alone that this is the broad 'list my matches' entry point versus the more specific match tools.

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