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

Annotations already declare readOnlyHint=true and destructiveHint=false, covering the safety profile. The description adds genuinely useful behavior beyond that: Daat is addressable and 'its response says plainly that it is counted in some diagrams and not in others,' pre-disclosing an edge case an agent would otherwise hit at runtime. It also previews response content, which matters because there is no output schema.

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?

Three sentences, each earning its place: the first is a dense but organized enumeration of return fields, the second covers the Daat edge case, and the third states intended use cases. The primary action is front-loaded and there is no filler or repetition of the title.

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 no output schema, the description carries the return-value burden — and it delivers a nearly complete field list, which is rare. Combined with 100% schema parameter coverage and read-only annotations, nothing an agent needs to call this correctly is missing; the Daat special case is even pre-disclosed.

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 itself already documents all five parameters, including enums, defaults, and the sephirotSystem/letterAttribution disagreement notes. The description adds only a light tie-in ('the sphere it carries under the requested system') without new parameter-level detail, matching the baseline-3 case.

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 opens with a specific verb and resource — 'Return one sephirah in full' — and enumerates exact return fields: Hebrew and English names, pillar, world, sphere, emanation meaning, and every touching path with its letter and tarot trump. This scope clearly distinguishes it from siblings like get_kabbalah_tree (whole tree at once) and get_kabbalah_letters_id (single letter).

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?

The closing sentence gives concrete usage context: 'Built for sephirot detail pages and for tree diagrams that load one node at a time.' This implies when to prefer it over fetching a whole tree, but it never names an alternative explicitly or states a when-not-to-use condition, so it stops short of the top score.

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