mcp_opendaw_set_audio_region_fade

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

With no annotations, the description must carry behavioral transparency. It discloses the skip behavior, slope range, and return of updated fade values. It does not mention prerequisites (e.g., region existence) or confirm if it overwrites existing fades, which would be beneficial but not critical.

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 efficiently structured: a header sentence, a paragraph explaining the Fading object and skip value, then a bullet-like list of parameters with brief descriptions, and a sentence about the return. No unnecessary words.

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 7 required parameters and an output schema, the description covers parameter details and return value. It lacks explicit error handling or prerequisites, but output schema exists to describe return structure. Adequately complete for typical use.

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%, so the description compensates fully. It explains each parameter: unit_index, track_index, region_index, fade_in/out (seconds, -1 to skip), in_slope/out_slope (0-1 curve). This adds significant meaning beyond the schema titles.

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 'Set fade in/out on an audio region' and explains the Fading object's four parameters, distinguishing it from other region operations like gain or time base. It is specific and unambiguous.

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 explains how to skip parameters with -1.0 and the slope curve values, but does not explicitly state when to use this tool versus alternatives (e.g., copy_region_fades or set_audio_region_gain). Usage context is implied but not guided.

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