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

Annotations already declare destructiveHint=true and readOnlyHint=false, so the agent knows this is an irreversible write. The description adds only the scope qualifier 'direct fee row'; it says nothing about whether the delete cascades, whether confirmation is required, or what the caller sees on success or failure. With annotations carrying the safety profile, this is adequate but thin.

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 with no filler or repetition. It is efficient, though its brevity shades into under-specification rather than exemplary conciseness.

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 two-parameter destructive mutation the annotations and fully documented schema cover the essentials, but the description leaves open what 'direct fee' means and what happens to the parent fee after deletion. The minimum an agent needs to call it correctly is present; the behavior around the call is not.

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% – both id and fee_id are documented with their source tools (list_boats, list_boat_fees). The description adds nothing about parameter meaning or format, so the baseline 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 and resource (delete a fee row), which distinguishes it from the sibling add_fee and update_fee. The qualifier 'direct' hints at a scope distinction, though it never explains what a non-direct fee would be, so the differentiation from siblings is only partial.

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?

No guidance on when to use this versus update_fee (which could also clear a row) or the broader delete_* family. No prerequisites, no warnings, no mention that list_boat_fees is the source of the required row id beyond what the schema already says.

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