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

Annotations already cover the safety profile (readOnlyHint, idempotentHint, destructiveHint false, openWorldHint false), so the bar is lower. The description adds real context beyond them: the catalogue is the app's own (reinforcing closed-world), plans are returned 'with day one read from the stored text', and each day has a defined shape. It stops short of richer behavioral detail.

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 content is front-loaded with the resource name, but the whole description is one run-on, colon-chained sentence embedding a 15-item plan list plus four sample queries. Much of that list is useful for semantic matching, but the packaging is dense and harder to parse than discrete sentences would be.

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 an output schema present, return values need no explanation, and both parameters are fully described in the schema. Purpose, both invocation modes, and trigger examples are covered; only explicit sibling routing is missing, which keeps it below 5.

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 both parameters are already documented; baseline is 3. The description reinforces that 'plan' accepts a need as well as a name and implies day defaults to 1, but adds little syntax or matching detail beyond the 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?

The description states a specific resource (The Living Bread's reading-plan catalogue) and what it returns (each day's title, reference, short word and one step), and the app-catalogue framing scopes it. It never names a sibling tool to differentiate from, so it falls short of the 5 bar for explicit sibling differentiation.

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?

It clearly describes the two invocation modes ('with a name or a need it returns that plan ... alone it lists them') and supplies realistic trigger phrasings ("a reading plan for anxiety", "how do I start reading the Bible"). It gives no explicit when-not guidance or named alternatives among the many sibling tools.

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