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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive), yet the description adds real behavioral content: it performs a permission check (owner or editor) and returns a presenter link rather than acting. With no output schema, disclosing what comes back is valuable. Minor gap: it doesn't state what happens if the permission check fails.

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 purpose, then the key negative constraint, then the returned artifacts and guest flow. Every sentence earns its place and no sentence repeats the schema or annotations.

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 one trivial parameter, no output schema, and annotations covering safety and idempotency, the description fills exactly the remaining gaps: the permission requirement, the returned presenter link/steps, and how the guest link is produced.

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?

Single parameter with 100% schema description coverage, so the schema carries the meaning. The description adds no format or constraint detail about flow_id beyond what the schema states. Baseline 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?

Names a specific verb+resource ('Get ready to present a flow live') and immediately scopes it: it does NOT start the session, because the live room lives in the presenter's browser. An agent can distinguish this from share_flow or show_flow without opening any 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?

Gives clear context ('on a call') and an explicit when-not ('This tool does not start the session'), which routes the agent away from expecting a launched room. It does not name an alternative sibling, but none exists in the tool list, so the guidance is effectively complete.

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