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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. The description adds one genuinely useful behavioral fact — that hard target words and solution paths are deliberately omitted from the response — but says nothing about error handling for malformed or missing IDs, nor about the optionality of 'paper'.

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?

Two compact sentences with the primary outcome (get the puzzle and files) front-loaded and the caveat about omitted data trailing. Nothing is padded, though the phrasing 'Get a real ... puzzle ID' is slightly ambiguous about whether it returns an ID or takes one.

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?

An output schema exists, so return shape need not be spelled out, and the annotations cover safety. What remains uncovered is behavior on invalid IDs, the optional-vs-required status of 'paper', and any routing to search_puzzles — gaps that matter for a two-parameter fetch tool.

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 0%, so the description must compensate. It does partially: 'category/slug puzzle ID' explains the id shape (matching the hard/... or large-print/... pattern) and 'Letter/A4' maps to the paper enum. However it never states that 'paper' is optional, what the default is, or which categories are valid, leaving real gaps.

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 a specific verb (Get) and resource (puzzle) and enumerates what comes back: a fixed grid plus Letter/A4 puzzle and answer PDFs. It is clearly a by-ID fetch, which contrasts implicitly with the sibling search_puzzles, but the description never names that sibling so the differentiation is left to inference.

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 explicit when-to-use guidance, no prerequisites, and no mention of search_puzzles as the alternative for discovery. The agent must infer from the required 'id' parameter that this is the follow-up call after a search, which is reasonable but undocumented.

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