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

With readOnlyHint, idempotentHint, and destructiveHint already declaring the safety profile, the description still adds real behavioral context: in host-drawing apps the player plays the draft inline in the conversation, while elsewhere the response returns a short link that opens the draft in Cesure with no account required, plus a score summary. That is meaningful environment-dependent behavior beyond the 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 first sentence is front-loaded and clear, but the second is circuitous ('Where the host draws apps', 'everywhere') and forces the reader to parse two vague spatial clauses to extract the actual behavior. It is not bloated, but the phrasing costs more effort than it should.

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?

The tool is a single-parameter, read-only, idempotent operation with an output schema, so return values need not be spelled out. The description covers the two outcomes (inline playback vs. shareable link plus summary), which is sufficient context for an agent to call it correctly; only explicit routing guidance is absent.

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% and the single 'draft' parameter is documented in the schema as 'the id a previous tool gave (draft).' The description adds no format, sourcing, or validity details beyond that, so the baseline of 3 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?

The opening sentence gives a concrete verb and resource: 'Show the draft in the Cesure player, to read and hear it.' That is enough to distinguish it from read-oriented siblings like read_score and read_my_score, which retrieve score data rather than render/play a draft. It stops short of explicitly comparing itself to those siblings, so it lands at 4 rather than 5.

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 when the tool behaves differently (host apps that draw vs. elsewhere) but never states when an agent should call this instead of alternatives such as read_score or list_my_scores. There is no explicit precondition, sequencing (e.g. 'after create_score'), or exclusion. Conditional outcome is not the same as usage guidance.

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