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

Annotations already declare readOnly, idempotent, non-destructive, closed-world behavior, so the safety profile is covered. The description usefully adds scope exclusions (no rhythmic arrangement) and hints at the return shape, but says nothing about what 'supported chord' means or how invalid input behaves.

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 core action front-loaded and the constraint immediately after. Nothing could be removed without losing meaning.

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?

The description is reasonably complete for a read-only, idempotent transformation with no output schema: it names the return values and rules out rhythmic output. It still leaves 'supported chord' undefined, which is the one thing an agent needs to call it correctly.

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% for both parameters, so the description must carry the load. It mentions 'octave' generically but never explains the octave range, default, or the accepted chord-symbol syntax (e.g., 'Cmaj7'), leaving the required 'symbol' parameter effectively undocumented.

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 ('spell') and resource ('chord') and names the output form (piano pitches with octave and MIDI values), so the transformation is unambiguous. It does not name any sibling tool, and the contrast is only implied through the rhythmic-arrangement disclaimer.

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?

The sentence 'This does not create a rhythmic arrangement' implicitly tells the agent when to prefer something else (e.g., tab_to_piano_notes) but never names that alternative or states the positive condition for choosing this tool. Usage is implied rather than directed.

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