ReaMCP

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

No annotations provided, so description carries full burden. It discloses valid action values and that position uses seconds, but fails to describe side effects (e.g., does 'record' arm tracks or start recording immediately?), state changes, or whether actions are idempotent. The unit disclosure ('seconds') adds value beyond the schema.

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?

Extremely efficient two-line structure. First line establishes purpose; second line documents parameters. Zero redundant prose. Inline parameter documentation is appropriate given the lack of schema descriptions.

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?

Appropriate for a simple 2-parameter tool with output schema (which handles return value documentation). Despite 0% schema coverage, the description successfully documents the parameter enums and requirements, which is sufficient for this operational command tool.

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?

With 0% schema description coverage, the description effectively compensates by documenting the enum values for 'action' inline and clarifying the conditional requirement and unit (seconds) for 'position'. However, it doesn't describe boundaries, precision, or semantic meaning of the position value (e.g., timeline location).

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?

Clear specific verb ('Control') and resource ('REAPER's transport'). The enumerated action values (play/stop/pause/record/goto_start/goto_position) precisely scope the functionality and implicitly distinguish it from siblings that manipulate tracks, items, or effects rather than playback transport.

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?

Provides parameter constraints ('position: required when action == goto_position') but lacks guidance on when to use specific actions (e.g., when to use goto_start vs goto_position) or when to prefer this over other temporal navigation methods. No mention of prerequisites or state requirements.

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