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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world), so the bar is lower. The description adds real context beyond them: the results are deterministically computed from a defined verse rather than table-sourced, plus the endpoint and a 5-credit cost that an agent should factor into budgeting. Return-shape details are rightly omitted since an output schema exists.

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 core definition is front-loaded in one dense sentence, followed by a short filtering sentence, then templated group/endpoint/cost metadata. Little is wasted, though the bracketed boilerplate slightly dilutes the prose.

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 parameterless read-only lookup with an output schema, the description covers what the tool returns and how to filter it. Nothing essential is missing; the only gap is the absence of explicit sibling comparisons, which the group label partially compensates for.

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 coverage of the two declared params (fields, precision) is 100%, so a baseline of 3 applies. The description goes further by documenting two filter parameters (index, longitude) with explicit ranges that are not declared in the schema, giving the agent usable selection syntax. This adds value, though the fact that these filters are undocumented in the schema itself is a mild inconsistency.

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 states a specific resource (the 72 three-letter Shem HaMephorash names) and adds a distinguishing provenance detail — computed from Exodus 14:19-21 rather than looked up. That scope is clearly separable from kabbalah siblings like sephiroth or gematria. It stops short of naming an alternative sibling, so it lands at 4 rather than 5.

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?

It gives concrete filter guidance ('?index=1..72 or ?longitude=0..360'), which tells the agent how to narrow the call. It never says when this tool is preferable to the other Kabbalah or esoteric tools, so there is implied usage but no genuine when-to-use/when-not routing.

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