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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint=false, and destructiveHint=false, so the safety profile is fully covered. The description adds that the output mirrors what the app displays today, which is mildly useful context, but says nothing about the shape of the reading (verses? cards? passages?) or handling of a missing day.

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 short and front-loads the actual purpose, which is good. But roughly half of it is an app-level feature blurb ('daily verses, plans, search and verse lookup; whole books from the Library') that does not earn its place in a single-tool definition and reads as 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 zero-required-parameter read tool with no output schema and full annotation coverage, the definition is close to sufficient. Still missing is any signal of what a 'reading' contains or how it differs from sibling retrieval tools, which leaves the agent to guess at runtime.

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% for the single optional 'date' parameter, so the schema already explains the YYYY-MM-DD format and the UTC default. The description adds no extra parameter meaning; the baseline 3 applies.

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 specific verb and resource ('Today's reading, line by line'), and 'same as the app shows today' pins down the exact scope. However, it does not distinguish itself from siblings like get_reading or get_card, and the trailing blurb describes the whole Bhagavad Gita app rather than this tool.

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?

No guidance on when to call get_today versus get_reading, get_card, or list_readings, even though those siblings overlap heavily. The second sentence lists app features (plans, search, verse lookup, whole books) without tying any of them to a selection condition for this tool.

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