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

Annotations already declare readOnlyHint=false, idempotentHint=true and destructiveHint=false, so the safety profile is covered. The description adds the 'host-created' restriction, which implies events created by others cannot be edited here, but says nothing about partial-update behaviour, permission requirements, or whether omitted fields are preserved.

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, zero filler, with the resource and the key scope rule front-loaded. Nothing here fails to earn its place.

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?

A nine-parameter mutation to a calendar object with no output schema needs at least a word on whether updates are partial and whether the attendees array replaces the existing list. The description covers the scope nuance but leaves those material questions unanswered.

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 all nine parameters, including both enums, are documented in the schema. The description's scope note largely restates the schema text ('future' to update all future instances), adding no syntax or semantics 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?

States a specific verb and resource ('Update a ... event') and adds the qualifier 'host-created', which usefully narrows the scope of what is editable. It does not name the nearest siblings (neuron_reschedule_booking, neuron_update_calendar, neuron_delete_event), so an agent must still infer the boundary, but the purpose itself is unambiguous.

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?

Gives one concrete usage rule: use scope='future' for recurring series. That is task-specific guidance, but it is mainly about a single parameter rather than when to pick this tool over neuron_reschedule_booking or neuron_update_calendar, and there are no exclusions or prerequisites.

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