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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the safety profile is covered. The description adds the credit cost (10, Tier 1) and tradition grouping, but says nothing about what 'combined' means operationally — whether the three systems are aligned into one timeline or returned separately, or whether targetAge drives the stack.

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 lines with the core purpose front-loaded and no filler; the bracket tags are compact metadata. It is arguably under-specified rather than padded, but every sentence present earns 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?

An output schema exists, so return values need not be explained, and annotations cover the safety profile. Still, for a niche technique-stacking tool the description never explains what the stack contains or how the three lord systems combine, leaving an agent to guess at the value of the combined call.

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 nested birth-data object, date/time/lat/lon requirements, ayanamsa, timezone handling, and the fields/precision compact-mode switches are all already documented in the schema. The description adds no parameter-level meaning beyond that, so 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?

Names a specific composite resource — a combined time-lord stack of profection, ZR and decennials for a date — which is more specific than most siblings such as astroway_prognostics_profections or astroway_hellenistic_hand_decennials. It does not, however, clarify how this differs from calling those individual tools, and 'ZR' is left unexpanded for non-specialists.

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 statement of when to use this combined stack versus the standalone profection, zodiacal-releasing or decennial siblings in the same family. The only scoping hint is the '[Group: Hellenistic: Brennan tradition]' tag, which is categorization rather than usage guidance.

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