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

Annotations already declare readOnlyHint=true, destructiveHint=false, and idempotentHint=true. The description adds the context of returning 'full release details' with specific fields but no additional behavioral traits like error conditions or rate limits. It does not contradict 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 a single 16-word sentence that immediately conveys the purpose and key output fields. No wasted words; it is optimally concise.

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 the presence of an output schema and full annotation coverage, the description sufficiently covers the tool's purpose and primary output. It could mention potential errors for invalid IDs, but for a simple lookup, it is largely 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 description coverage is 100% (the parameter 'mbid' has a description stating its format and what it returns). The tool description reinforces this, adding little extra meaning beyond the schema. Given high coverage, a baseline of 3 is appropriate.

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 'Get full release details by MusicBrainz ID' and lists the output fields (artist credits, labels, media formats). This distinguishes it from siblings like 'music.releases.search' (which searches) and 'music.artists.details' (which is for artists).

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 when a MusicBrainz ID is available, but it does not explicitly state when to use this tool versus alternatives like searching. No guidance on prerequisites or exclusions is provided.

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