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

The description adds consent context and explains emailAccess, but with destructiveHint=true it should disclose what registration changes and whether it is irreversible. It also does not address idempotency or open-world behavior already declared in annotations.

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?

The description is short and front-loaded, with no filler. The three sentences are readable and each contributes something, though the emailAccess sentence could be tied more explicitly to the agent parameter.

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 six-parameter, four-required, destructive registration tool with no output schema and no schema descriptions, the description is too sparse. It omits most required parameters and does not explain the destructive side effects or what a successful registration produces.

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 0%, so the description must compensate. It explains only email and emailAccess, leaving eventId, name, requestId, and agent undocumented, including the required requestId format and eventId pattern.

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 states a specific action: registering yourself or the person you represent, with their email. It is clearly a participant-registration tool, though it does not explicitly mention the event or distinguish itself from nearby tools like update_participant.

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 implies when to use it by telling the caller to register themselves or someone they represent, and adds a consent constraint against registering others without permission. It does not name alternatives or explain when another sibling tool would be more appropriate.

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