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

Annotations already declare readOnlyHint=false, destructiveHint=false, and idempotentHint=false, so the mutation/non-idempotence profile is covered structurally. The description adds nothing beyond that: it does not mention what is left untouched by a partial update, whether the operation is reversible, or that approval_id requires a human-approved request. With annotations carrying the safety profile, this near-empty description adds minimal extra 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 short clause with no waste, and the condition is front-loaded. It is appropriately sized for what it conveys, though the fragmentary 'When...' construction is more a trigger phrase than a structured lead.

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?

An output schema exists, so return values need not be described, and annotations cover the safety profile. However, for a mutation tool with five parameters including a single-use human-approved approval_id, the description omits the approval requirement and any partial-update behavior, leaving an agent under-informed about what a call entails.

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 100%, so the schema already documents all five parameters, setting the baseline at 3. The description echoes three of the field names (title, body, mood) but adds no syntax, format, or partial-update semantics, and never addresses entry_id or the unusual approval_id parameter.

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 identifies the resource (journal entry) and the fields it targets (title, body, mood), and the word 'corrected' implies modification of an existing entry, which separates it from journal.create/delete/get. The verb itself is only implied rather than stated, so it's clear but slightly indirect.

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 a when-to-use condition ('needs its title, body, or mood corrected'), which is implied guidance, but names no alternatives (e.g., journal.create for new entries) and states no exclusions or prerequisites such as the approval flow. Adequate but with clear gaps.

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