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 structurally. The description adds no behavioral context beyond that (no mention of what a 'reading' yields, plan-name resolution behavior, or errors for unknown ids), so it earns little credit above the annotations.

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 first two sentences duplicate the title, and the remainder is app-level marketing copy rather than tool-specific function. It is not front-loaded with what this tool does, and much of the text does not earn its place.

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 one-parameter read tool with no output schema, the description is minimally adequate, and the schema covers the id semantics. However, it omits anything about how 'reading' vs 'plan' output differs or what 'line by line' returns, leaving a gap an agent would notice.

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?

With a single parameter and 100% schema description coverage, the schema fully documents the id field including that it accepts a reading/plan id or a plan name like 'japji'. The description adds nothing beyond this, so the high-coverage baseline of 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 description largely restates the app tagline and the tool title ("One reading or plan, line by line") rather than stating a distinct verb+resource for this tool. The line "Bhagavad Gita: daily verses, plans, search and verse lookup" describes the whole app's feature set, which overlaps with siblings like gita_get_today, gita_search_readings, and gita_get_verse, so it does not distinguish this tool from them.

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 when-to-use guidance or alternative is given. An agent cannot tell from this text whether to call gita_get_reading, gita_get_today, or gita_read_book for a given request; the sibling differentiation is absent.

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