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

Annotations already establish readOnlyHint=true, openWorldHint=true, idempotentHint=true, and destructiveHint=false. The description adds useful context that output is intended 'for voice' and is delivered 'one line at a time', but it does not clarify response format, pagination, or other operational behavior beyond that.

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?

The first sentence duplicates the title and has a double period, wasting the opening position. The second sentence is a long content inventory that does not front-load the tool's actual operation, so the structure is not appropriately focused.

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 three optional parameters, no output schema, and rich annotations, the description still needs to explain what a 'card' is and how get_card differs from siblings such as get_reading and get_today. It instead gives broad domain context, leaving the core tool-specific behavior incomplete.

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 the schema fully documents n, date, and reading with defaults and formats. The description adds no parameter-level meaning beyond what the schema already provides, making the baseline 3 appropriate.

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 first sentence restates the title verbatim, including the doubled period, so it adds no purpose beyond the tool name. The second sentence lists content domains but never states the action or return type clearly enough to distinguish get_card from siblings like get_reading, get_today, or read_book.

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 guidance on when to use this tool versus alternatives, and no prerequisites or exclusions are mentioned. The content list suggests broad relevance but does not route the agent among get_reading, get_today, list_readings, or read_book.

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