MIDI Play Phrase

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

With no annotations provided, the description carries full burden for behavioral disclosure. While it mentions 'natural articulation and expression' and conversion to 'legato/staccato', it doesn't disclose important behavioral traits like whether this is a blocking/non-blocking operation, error handling, resource requirements, or what happens if MIDI output isn't available. For a tool with 6 parameters and no annotations, this is insufficient.

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 appropriately sized with two concise clauses that both add value. The emoji adds visual context without being distracting. It's front-loaded with the core functionality and follows with a specific example. Every element earns its place, though it could be slightly more structured.

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?

Given 6 parameters, no annotations, and no output schema, the description provides adequate basic context but leaves significant gaps. It explains what the tool does but doesn't cover behavioral aspects, error conditions, or what constitutes successful execution. For a musical playback tool with multiple configuration options, more completeness would be expected.

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 the schema already documents all parameters thoroughly. The description adds minimal value beyond the schema by providing a concrete example ('C4 E4 G4') and mentioning the conversion to articulation styles, but doesn't explain parameter interactions or provide additional semantic context beyond what's in the schema descriptions.

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 clearly states the specific action ('Play musical phrase') with the resource ('MIDI'), and distinguishes from siblings by specifying 'with natural articulation and expression' and conversion functionality. It goes beyond the name/title by explaining what the tool actually does with musical input.

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 description implies usage context through 'natural articulation and expression' and the conversion example, suggesting this is for expressive musical playback rather than basic note triggering. However, it doesn't explicitly state when to use this vs alternatives like midi_play_and_listen or midi_send_note_enhanced, nor does it provide any exclusion criteria.

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