SunoMCP

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It describes the return value ('Categorized list of all actions'), but omits other behavioral traits such as whether this requires authentication, if results are cached, or rate limiting considerations. It meets minimum expectations for a read-only discovery tool but lacks depth.

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 consists of four well-structured sentences with zero waste: (1) core function, (2) usage context, (3) value proposition, and (4) return value. Information is front-loaded and every sentence earns its place.

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 that this is a zero-parameter tool with an output schema (per context signals), the description appropriately provides a high-level summary of returns ('Categorized list') without needing to detail the schema structure. It is complete enough for a discovery tool, though additional behavioral context would elevate it further.

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?

The input schema contains zero parameters, which per evaluation rules establishes a baseline score of 4. The description correctly implies no parameter configuration is needed by focusing entirely on the tool's output and purpose without referencing inputs.

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 'List[s] all available Suno API actions and corresponding tools' with the specific purpose of being a 'Reference guide for what each action does and which tool to use.' It effectively distinguishes itself from its 20+ action-oriented siblings (like suno_generate_music) by positioning itself as a meta/discovery tool.

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 provides clear context for when to use this tool ('Helpful for understanding the full capabilities of the Suno MCP' and knowing 'which tool to use'). However, it lacks explicit guidance on when NOT to use it (e.g., 'do not use this for actual music generation') or workflow sequencing ('call this first to select a tool').

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