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 fully covered elsewhere. The description adds no behavioral context of its own for this tool (no mention of pagination, ordering, or scope) and instead describes other tools' behaviors, such as reading a whole book 'a passage at a time'.

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 opening sentence duplicates the title, and the second sentence is a sprawling semicolon list of sibling capabilities that is off-topic for this tool. The content that would matter (what this tool returns, how it differs from the siblings) is absent, so the text is both redundant and misdirected.

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 read-only, zero-parameter list tool with no output schema, the annotations cover the safety semantics, so little is strictly required. However, the description never states what list_readings actually returns, and its second sentence conflates this tool with its siblings, leaving the agent to guess its role in the suite.

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 takes zero parameters and the schema is an empty object, so there is no parameter surface for the description to clarify. Baseline 4 applies per the rubric for zero-parameter tools.

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 names the resource ('All curated daily readings and plans') but never states the list/retrieve action, and it is nearly a verbatim restatement of the title. The second sentence is a catalog of sibling-tool functionality (daily shabad, search, Ang/shabad lookup, whole books) rather than a description of what list_readings itself does, so the agent cannot cleanly distinguish this tool from get_reading, get_today, or list_books.

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 enumerates what sibling tools cover ('daily shabad, plans, search, Ang and shabad lookup; whole books from the Library') but never says when to choose list_readings over those siblings. There are no conditions, prerequisites, or exclusions to guide selection.

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