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

Annotations already declare readOnlyHint=false, destructiveHint=true and idempotentHint=true, so the safety profile is covered. The description adds one genuinely useful trait beyond them — patch semantics via 'Only provided fields change' — but says nothing about what destruction an update can cause (e.g. an entry type change, which the schema notes can be refused) or any permissions required.

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?

Two short sentences, front-loaded with the action and resource, with no filler. The trailing '...' in the field list is the one sloppy element, leaving the scope of updatable fields ambiguous.

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 9-parameter mutation tool with no output schema and 11% schema coverage, the description is far too thin — it neither documents the parameters nor explains the destructive nature flagged by annotations, leaving an agent under-informed before a write.

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 only 11%: of 9 parameters, just 'type' is documented, and that documentation lives in the schema rather than the description. The description names name, tagline, description, tags and aliases but trails off with '...' and omits entryId, series, avatarUrl and type, so it does not compensate for the coverage gap.

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 (Update) plus the resource (an entry's metadata) and enumerates several updatable fields. It is distinguishable from sibling mutations like update_world or create_entry, though it never names or distinguishes against those siblings explicitly.

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 no when-to-use guidance: nothing says when to update an entry versus creating a new one or editing via another tool such as upsert_panel. The only usable inference is the partial-update semantics from 'Only provided fields change'.

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