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

The readOnlyHint/idempotentHint annotations only say this is a safe, repeatable read; the description adds the outcome the agent actually needs - the game counts as a loss and the answer is disclosed - plus the exact return payload (answer, board, spoiler-free share grid). The description is consistent with the annotations since ending a game is conceptual and idempotent rather than a server-side mutation.

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 sentences with zero waste: the restrictive trigger comes first, then the effect and return payload, then the inputs. Everything is front-loaded where an agent needs it.

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 no output schema, the description correctly enumerates the return values, and the safety profile is carried by annotations. Minor gaps remain: nothing about whether the loss is recorded in stats or how conversation_id behaves, though the schema covers that parameter.

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 100%, so each parameter is already documented in the schema. The description restates the two salient ones (puzzle number, all prior guesses) and stresses completeness of previous_guesses, but adds no syntax or edge-case guidance beyond the schema. 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?

The description names a specific action (end the game as a loss and reveal the answer) against a specific resource (a Words With Attitude puzzle), plus the payload returned. It is clearly distinguishable from submit_guess and start_daily_puzzle by the 'give up' trigger, though it never names those siblings explicitly.

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?

'Use this only when the player asks to give up' is an explicit, exclusive trigger condition that rules out ordinary guessing. It also tells the caller what to pass ('the puzzle number and every guess made so far'), but it does not name submit_guess as the alternative path for continuing play.

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