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

Annotations already declare readOnlyHint=true, idempotentHint=true and destructiveHint=false, so the safety profile is covered. The description adds only the conditional behavior that Tara/Chandra Bala is present only when a natal chart is supplied; it discloses nothing about error conditions, timezone requirements, or locale-dependent output.

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?

It is a single front-loaded sentence with no filler, but the bulk is a long enumerated list of return contents that largely duplicates what the output schema already declares. Word budget is spent restating results rather than adding routing or setup information.

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?

An output schema exists, so enumerating return values is redundant, yet that is the entirety of the description. For a tool with a nested natal object, an either/or location requirement, and a near-identical sibling, the agent is left without the call-setup and sibling-selection information it actually needs.

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 only 38% across 8 parameters (including a nested natal object), so the description must compensate and does not. It hints that a natal chart unlocks optional Bala outputs, but says nothing about date/place versus explicit coordinates, the required IANA timezone, language, or timezoneOffset fallback.

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 names a specific resource (daily Panchanga) with a clear verb ('Returns') and enumerates the constituent outputs, so an agent can tell it produces daily almanac data. However, it never distinguishes itself from the sibling get_natal_panchanga, even though it mentions 'optional Tara/Chandra Bala from a natal chart', leaving overlap ambiguous.

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?

There is no when-to-use guidance: no mention of when to prefer this over get_natal_panchanga, no prerequisite about needing place OR latitude/longitude/timezone, and no note on when the natal object is worth supplying. The sentence is purely a content list, not usage direction.

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