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

readOnlyHint=true already declares this is a safe read, so the description's main added value is confirming single-record retrieval. It does not disclose behavior on a missing/invalid ID (error vs empty) or any scoping/permission constraints, which would be genuinely useful additional context.

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?

A single front-loaded sentence with no redundant phrasing. It is appropriately sized for a trivial one-parameter lookup, though it could have used its brevity budget to add a usage hint.

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 simple get-by-ID read with readOnlyHint covering safety and no output schema, the essentials are present, but the description says nothing about return shape or failure behavior when the ID doesn't resolve. Adequate but with clear gaps.

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?

The schema documents only type and length bounds with 0% description coverage; the description clarifies that the lone 'id' parameter is the timeentry's ID rather than a user/workspace ID. That is a meaningful but minimal addition, leaving format assumptions (e.g., UUID) unstated.

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 (Get) and resource (Hub Planner timeentry) with scope (one, by ID), which distinguishes it from list_time_entries and search_time_entries siblings that return many. It is clear, though it doesn't explicitly name the multi-item siblings it contrasts with.

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?

Usage is only implied: 'by its ID' signals single-record lookup versus listing/searching, but the description never says when to prefer this over hubplanner_list_time_entries or hubplanner_search_time_entries, nor what to do if the ID is unknown. No explicit alternatives or exclusions are given.

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