setup_session

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

With only destructiveHint=false in annotations, the description adds significant behavioral context: it creates tracks, sets tempo, searches browser for instruments, and returns per-track report. It does not disclose potential side effects on existing tracks or failure scenarios, but overall adds value beyond the sparse 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 extremely concise: two brief paragraphs with front-loaded purpose, a clear example, and no redundant information. Every sentence serves a purpose.

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 covers the core functionality well, including return format. It omits edge cases (e.g., track array empty, instrument not found) and does not reference the output schema, but given the tool's complexity and schema gaps, it is reasonably complete.

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 coverage is 0%, so the description compensates well for the tracks parameter with an example and explanation of the instrument field. The tempo parameter is only mentioned as 'set tempo' without range or unit, leaving some ambiguity. Overall, the description adds most of the missing semantics.

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 tool's purpose: 'Bootstrap a session in one call: set tempo and create named MIDI tracks, optionally loading an instrument.' This specifies the verb (bootstrap/set/create) and the resource (session), distinguishing it from siblings like set_tempo or create_midi_track that handle single actions.

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 for efficient session setup ('in one call') but does not explicitly state when to use it versus alternative approaches like sequential calls. It provides details on the tracks format but lacks exclusion criteria or comparison to sibling tools.

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