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

Annotations already declare safe, idempotent, read-only behavior, so the description's main added value is the bounded-rendering caveat and the promise that unsupported nodes are reported instead of silently passed through — important for trusting the output. It still leaves 'bounded' undefined and says nothing about token scope or failure modes, so it is not fully transparent.

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?

Four tight sentences, front-loaded with the action and mechanism, then outputs, then the bounded-rendering caveat, then the alternative. Every sentence carries unique information with no redundancy.

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 no output schema, the description does well to enumerate the three return artifacts (preview WAV, wavetable WAV, preset archive), which an agent needs. However, for a tool whose entire parameter set is undocumented in the schema, omitting any parameter guidance leaves a real hole for correct invocation.

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% for all three required parameters (sessionId, token, revision), and the description never explains what any of them are — no mention of token provenance, revision semantics, or how sessionId identifies the session. 'Exact shared revision' faintly gestures at the revision param, but this is far short of compensating for the schema gap.

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 ('Render an exact shared revision') plus the execution mechanism ('Hyperwave's shipped WASM engine without an open browser'), which cleanly separates it from sibling tools like edit_session, read_session, and checkpoint_session. An agent can tell what it produces without opening the schema.

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 a clear usage context ('without an open browser') and an explicit off-ramp for the heavier case ('Open editorUrl for larger interactive renders'). It does not name any sibling tool as an alternative, so the when-to-use guidance is contextual rather than fully comparative.

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