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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so the safety profile is covered. The description adds real behavioral context beyond them: partial results are reported as pending rather than erroring, and the call has no side effects on transcription, reasoning or storyboard generation. It does not mention auth or rate limits, keeping it below a 5.

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?

Front-loaded with the purpose, then the return surface, then two short qualifiers about pending state and cost/side effects. Every sentence carries information, though the return-value enumeration is somewhat list-like and partly redundant with the output schema.

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?

With a single fully documented parameter, an output schema covering the returns, and rich annotations, the description covers what an agent still needs: that missing analysis is a valid pending state and that the call is free and side-effect-free. Nothing essential is missing, though a pointer to the follow-up tool for acting on the analysis would complete the picture.

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?

There is a single parameter with 100% schema description coverage, and the schema already tells the agent the projectId comes from studio_projects_list or studio_video_start. The description adds no format, constraint, or edge-case guidance for projectId, so the baseline 3 for schema-does-the-work applies.

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?

States a specific verb and resource ('Read the currently attached song and its technical analysis for a project') and enumerates the returned fields, so an agent knows exactly what this surfaces. It also explicitly negatives the workflows it does not touch (transcription, reasoning, storyboard), which cleanly separates it from studio_storyboard_prepare, studio_song_attach and studio_song_reuse.

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?

Gives clear context for use: it is a status read ('Absent analysis stays pending'), it is free, and it never triggers downstream work, so an agent can safely poll it. It stops short of naming alternative tools (e.g. when to use studio_song_attach versus this), so it is context-rich but not a full when/when-not routing rule.

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