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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint, and destructiveHint=false, so the safety profile is covered. The description adds limited behavioral context by noting 'same as the app shows today' and 'line by line,' but it does not describe return format, authentication needs, or rate limits.

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 is concise and front-loaded, but the second sentence is a broad product description that mentions plans, search, and whole texts read a passage at a time. Those features belong to sibling tools and do not help an agent call stoics_get_today correctly, so the description contains avoidable noise.

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 read-only daily-reading tool, the annotations cover the safety profile and the schema covers the optional date. However, no output schema exists and the description only vaguely indicates the return as 'line by line,' without describing the output structure, so it is adequate but not complete.

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?

The input schema has 100% description coverage for the single optional 'date' parameter, so the schema already documents that parameter fully. The description adds no parameter-specific meaning beyond what the schema provides, which makes 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 states a clear resource and temporal scope: 'Today's reading, line by line.' The tool name and title make the verb-plus-resource easy to infer. However, the description does not explicitly distinguish this tool from siblings like stoics_get_reading or stoics_search_readings, and the second sentence conflates other app features.

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?

Usage is implied by 'Today's reading' and the title, so an agent can infer it should be used for the daily reading. But there is no explicit when-to-use guidance, no when-not-to-use guidance, and no named alternatives among the sibling tools.

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