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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds the cost/tier disclosure ('50 credits (Tier 3)') and notes the return flavor (applying/separation aspects), which is useful context beyond the annotations, but says nothing about auth needs, rate limits, or result volume.

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?

Two short sentences plus structured metadata lines; the core action is front-loaded and there is no filler. It is efficient, though the metadata tags are more bookkeeping than description.

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?

With a rich nested input schema, full annotation coverage and an output schema, the description only needs to add routing and scope context. It states what is computed and returned but omits the one thing the structured data cannot supply: how this differs from the transit_calendar sibling, which is a real gap for a prognostic-category tool.

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%, so the schema already documents body, fields and precision thoroughly, including the transitDate requirement. The description adds nothing parameter-specific, which is the expected baseline when the schema carries the full burden.

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?

States a specific verb and resource ('Calculate transit planet aspects to natal planets for a given date') and names the return content ('applying and separating aspects'). However, it does not differentiate itself from the very similar sibling astroway_prognostics_transit_calendar or astroway_cosmobiology_transit_midpoints, leaving the agent to guess which transit tool to pick.

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 and no alternatives named, despite the presence of a near-identical sibling (transit_calendar) that an agent could easily confuse this with. The only routing hint is the '[Group: Prognostics]' tag, which is too weak to count as usage guidance.

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