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

Annotations already declare idempotentHint=true, destructiveHint=false and readOnlyHint=false, so the safety profile is covered. The description adds nothing beyond that: it does not say whether this is a partial update (only supplied fields change) or whether the entry must belong to the given kbId, which matters for a mutation tool.

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 that names the verb and target immediately. It is efficient, though the field list is arguably redundant with the schema and could have been spent on usage or partial-update semantics instead.

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?

This is an 8-parameter mutation tool with a nested metadata object and no output schema. The description ignores updatable metadata and expiresAt entirely and never states partial-update behavior, leaving meaningful gaps that the annotations do not cover.

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 100%, so the schema already documents all 8 parameters including the enum, the metadata object, and the expiresAt clearing semantics. The description only echoes four of the updatable fields (content, title, folder, source) and adds no format or constraint information beyond the schema, so the baseline of 3 applies.

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) and resource (existing knowledge base entry) and enumerates the fields that can change. It does not differentiate itself from close siblings such as neuron_update_knowledge_base or neuron_delete_kb_entry, so it stops short of a 5.

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 guidance on when to use this versus neuron_create_kb_entry, neuron_update_knowledge_base, or neuron_delete_kb_entry, and no mention of prerequisites such as needing an existing entryId. Usage is only implied by the word 'existing'.

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