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

Annotations already declare readOnly, idempotent, and non-destructive behavior, so the safety profile is covered. The description adds real context beyond that: it discloses the template pool (global presets and user-owned), that fasting/eating hours are returned, and that selected/enabled entries are flagged.

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?

One front-loaded sentence with no filler. The parenthetical and trailing clause are dense but each carries useful scope or output information rather than padding.

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 zero-parameter read-only list with no output schema, the description covers the pool of templates, the key data fields (fasting/eating hours), and the selected/enabled markers. It stops short of describing ordering or return shape, but nothing essential for correct invocation is missing.

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?

There are zero parameters, so the baseline is 4. The description doesn't need to explain any input semantics, and it uses the space instead to clarify what the listing covers.

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 (List) and resource (fasting templates), and pins down the scope: global presets plus the signed-in user's own templates, with their fasting/eating hours. It also distinguishes itself from still_select_fasting_template by saying it marks the selected and enabled entries rather than choosing one.

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?

The listing intent is implied clearly by 'available to the signed-in user,' but the description never states when to call this versus siblings like still_select_fasting_template or still_get_fasting_state. An agent can infer it, but there are no explicit alternatives or exclusions.

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