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

Annotations already declare readOnlyHint=false, idempotentHint=true and destructiveHint=false, so the safety profile is stated. The description adds some access-control color ('a short sample is public; full journey and workbooks remain protected', 'Legacy balance redemption remains explicit'), but it is too opaque to tell which action has which side effects, and 'No hosted inference' is unexplained.

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?

Seven short sentences, but none is front-loaded as a purpose statement and there is no connective structure; they read as unrelated assertions rather than a spec. Brevity here is under-specification rather than conciseness.

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?

A six-parameter, three-action tool with no output schema and no annotations describing the actions, yet the description supplies no coherent operating model. An agent is missing everything needed to call list/start/read correctly.

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 is only 17%, with just account_ref documented, so the description must compensate and largely fails. It loosely gestures at the 'voluntary' boolean and 'spend_paid_credit' ('Legacy balance redemption remains explicit') but says nothing about the action enum values, session_id, or request_key.

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 never states a verb+resource for what eclypse_nael does; it is a set of policy fragments ('Blue Crystal is included with active Practice', 'No hosted inference') that never says what list/start/read actually operate on. An agent cannot infer the tool's function from it, and no sibling is differentiated.

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 oblique guidance ('Start requires voluntary participation', 'Earlier purchased journeys can be reread') that faintly maps to the start/read actions, but there is no explicit when-to-use, when-not-to-use, or named alternative among the many eclypse_* siblings. Routing decisions are left to guesswork.

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