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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint, so safety is covered structurally. The description adds real behavioral context beyond that: 'never holds keys, never signs, never spends' and 'free, no auth' tell the agent the trust and cost profile before it commits to the flow.

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 core payload (what it returns, the read-only guarantee, no auth) is front-loaded in the first three sentences. The trailing agent-console sentence is closer to product marketing than tool-selection guidance and is the one part that does not clearly earn its place.

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?

For a no-param, no-output-schema discovery tool, the description covers what the agent gets back and the trust/usage posture, which is enough to call it correctly. It stops short of describing the shape of the returned steps, but nothing essential for invocation is missing.

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?

The tool takes zero parameters with an empty object schema at 100% coverage, so there is nothing for the description to disambiguate. Baseline of 4 applies; the description correctly adds no redundant parameter talk.

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 states a specific verb and resource ('Returns the 3-step hello-world flow') and enumerates the exact contents (what Voicescape is, the read-only guarantee, the first calls to make). It is clearly the onboarding entry point, distinguishing it from every sibling tool at a glance.

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?

'Start here if you've never used this server' gives an explicit adoption condition, which is the relevant guidance for an onboarding tool. No when-not condition or named alternative is given, but none is meaningful here since no sibling overlaps this function.

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