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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so safety is covered structurally. The description adds genuine non-structured context: that credentials may come from the argument or an Authorization header, and that they are never placed in URLs or echoed in errors. That is useful disclosure beyond the annotation set.

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?

Three short sentences, front-loaded with what is read, then auth mechanics, then a security guarantee. No filler, though the middle sentence is more operational guidance than purpose and slightly dilutes the opening.

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?

There is no output schema, yet the description names the returned content (game version, rules, session continuation), and the safety profile is fully carried by annotations. For a single optional-parameter read tool, an agent has everything needed to call it correctly.

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 coverage is 100%, so the baseline is 3, and the description goes further by documenting an alternative auth channel (the connection Authorization header) that the schema does not expose. It also reinforces the credential's private, non-URL nature, though that partially duplicates the schema's writeOnly/description text.

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?

It states a read verb and enumerates the payload (recommended exact-version game, rules, session continuation), so the resource is roughly identifiable. However, 'recommended exact-version game' is jargon that doesn't clearly differentiate this from sibling reads like play_state, play_assignment, or exact_game_version. The purpose is implied rather than crisply stated.

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?

The description explains how to supply auth but never says when to call this versus play_state, play_assignment, or start_play, which are the obvious alternatives in the sibling list. No prerequisites, ordering, or exclusion conditions are given, so usage must be inferred from the name.

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