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

Annotations already declare readOnlyHint=true and openWorldHint=false, so safety is covered. The description adds the useful ordering guarantee (oldest first) but says nothing about result size, pagination, or whether tables can appear in both this list and list_games.

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 ten-word sentence with no filler, and the scoping information is front-loaded. Nothing could be removed without losing meaning.

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 no-param read with an empty output schema, the description covers the essentials but omits the return shape (what a 'table' contains) and its relationship to the adjacent list_games tool. An agent could call it, but not confidently predict the response or decide between the two listing tools without opening the sibling definitions.

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?

The tool takes zero parameters, so there is nothing for the description to disambiguate; the baseline of 4 applies. The ordering note is a small bonus beyond an empty schema.

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?

Names the resource and its state precisely: multiplayer tables that are waiting for players. 'Oldest first' clarifies scope further. It does not explicitly differentiate from the sibling list_games, leaving the agent to infer that 'tables' means joinable game sessions rather than games in general.

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?

'Waiting for players' implies the use case (finding a table to join), but the description never says when to prefer this over list_games or start_game, nor any preconditions. Usage is inferable rather than stated.

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