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

No annotations are provided, so the description carries the full burden, and it says little: it clarifies that the return is 'the full record' rather than a partial view, but discloses nothing about permissions, behavior on an unknown/invalid id, or response shape (no output schema exists).

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 tight sentence with the action front-loaded. It loses a point because the '[FIND · door]' prefix and 'the keeping' consume space without aiding comprehension.

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 simple one-parameter read tool with no output schema or annotations, the description is marginally adequate: it says what is fetched and by what key. It is still silent on id format and failure behavior, which an agent would benefit from knowing.

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?

One parameter with 0% schema description coverage and no field-level documentation. The description only implies 'id' identifies a card; it adds no format, source, or validity guidance to compensate for the 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?

States a specific verb (Fetch), resource (one card / the full record), and key (by id), which is enough to tell it apart from list-style siblings like cards_browse or daily_card. The core sentence is clear, though the bracketed tag '[FIND · door]' and the jargon 'the keeping' add noise rather than precision.

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?

Gives no explicit when-to-use, when-not, or named alternatives (e.g., cards_browse for listing, card_connections for relationships). The phrase 'by id' only weakly implies you invoke it when you already hold a card identifier.

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