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

The annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered. The description adds useful context by stating the output includes feeds and their MCP/REST availability, and it points to the OpenAPI document. However, it does not describe the exact response shape or any pagination/formatting details, which keeps it at a moderate score.

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 description is two sentences with no filler. It front-loads the core purpose and then adds a useful supplementary reference to the OpenAPI URL without bloating the explanation.

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, zero-parameter listing tool with read-only annotations, the description is complete: it names what is listed, mentions the MCP/REST availability aspect, and provides an external OpenAPI link for further detail. The lack of an output schema is acceptable because the description directly conveys the expected result type.

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 tool has zero parameters and the input schema is empty, so there are no parameter semantics to document. The description appropriately focuses on output rather than inputs; the baseline of 4 for a no-parameter tool is 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 description clearly states a specific action ('List') and a distinct resource: The Family Almanac's free machine-readable feeds and their MCP/REST availability. It is easy to distinguish from sibling tools like get_guide or get_library_work, which retrieve individual items rather than enumerate feeds.

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 description implies when to use the tool: whenever the agent needs to discover available feeds and how they can be accessed via MCP/REST. It does not explicitly name sibling alternatives or exclusion criteria, but the listing purpose is clear enough for a zero-parameter discovery tool.

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