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

Annotations already cover the safety profile (readOnlyHint=true, openWorldHint=false), so the bar is lower. The description adds real value by disclosing what the payload contains and its normative role for make_move, though it says nothing about size, structure, or whether an unknown id errors.

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?

One short sentence with zero waste, leading with the most decision-relevant fact (what you get back) and ending with the actionable constraint on moves. Nothing to trim.

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?

With one parameter, no output schema, and full annotation coverage, the description does the needed work by naming the return contents. It could go further on error cases for an invalid id, but nothing essential for calling the tool is missing.

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%: the single 'game' parameter is documented with an example ('code-lock') and a pointer to list_games. The description adds no further meaning about valid ids or error behavior, so baseline 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?

States the specific resource and its contents: a game's full rules plus moveFormat, the JSON Schema moves must match. That content signature distinguishes it from siblings like list_games or get_replay, though the retrieval verb is only implied by the noun phrase rather than 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 clause 'your move must match' implicitly signals this is a prerequisite for make_move, which is useful. However, there is no explicit when-to-use statement nor any disambiguation against list_games (which is referenced only inside the parameter schema, not the description).

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