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

Annotations already declare readOnly, idempotent, non-destructive, closed-world behavior, and an output schema exists, so the safety and return-shape burden is largely covered elsewhere. The description adds that the payload includes tags and linked contacts, but says nothing about permissions, missing-id behavior, or errors.

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?

One short sentence, zero filler, and the triggering condition is front-loaded before the id prerequisite. Nothing is repeated or wasted.

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 single-parameter read with rich annotations and an output schema, the description supplies enough to call it correctly. Only minor edges, such as what happens with an unknown id, are left unstated.

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?

There is a single parameter with 100% schema description coverage, so the schema handles the semantics. The description only echoes the requirement of having an id, adding no format, type, or lookup nuance beyond it.

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 names a specific resource (one journal entry) and its scope (full content plus tags and linked contacts), which clearly separates it from the list-oriented sibling journal.list. It never states the retrieval verb outright, leaning on the title to convey the action.

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 an explicit trigger condition: use this when you need a single entry's full content and already hold its id. There is no named alternative (e.g. journal.list for browsing) and no exclusion guidance, so the routing is implied rather than spelled out.

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