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

Annotations already declare readOnlyHint=false and openWorldHint=true, and the description adds substantial context beyond them: the slot is freed, notify triggers an email, confirmation is required by default with an opt-out, and a Cotlet API key with app access is required. This is rich behavioral disclosure an agent can act on.

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 compact and front-loads the core action and effect before moving to confirmation and credential details. Every sentence carries information, though the opening 'SignUpGenius: Delete...' slightly duplicates the title.

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 mutation tool with no output schema, the description covers side effects (spot freed, email sent), confirmation requirements, and authentication needs. Nothing essential for calling it correctly is missing.

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 signup_id, participant_id and notify are already documented in the schema. The description restates the notify email behavior but adds no syntax, format, or sourcing detail beyond what the schema provides, so the baseline of 3 is appropriate.

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 verb and resource ('Delete a participant from a slot') and immediately clarifies the effect ('Removes one participant from their slot, which frees the spot'). This distinguishes it from siblings like signupgenius_add_participant and signupgenius_move_participant without ambiguity.

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 concrete usage context: confirmation is on by default but can be switched off for this tool, and because the action reaches other people the agent should confirm with the user before each call. It does not, however, name alternatives (e.g., move_participant) or state when-not-to-use, so it falls short of a 5.

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