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

The readOnlyHint annotation already declares the safety profile, so the trailing 'Read-only' adds nothing. However, because there is no output schema, describing that the result contains the signed-in user and their manageable host accounts is genuinely useful behavioral context about what comes back.

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?

Three short sentences, the identity/purpose statement is front-loaded, and each remaining sentence carries a distinct payload (workflow handoff, read-only note). Nothing to trim except the redundant read-only restatement.

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 parameters and no output schema, the description needs to sketch the return shape, and it does: user identity plus host accounts/team memberships. It could be slightly more explicit about what fields identify a host, but it is complete enough to call correctly.

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?

Zero parameters, so the baseline is 4. The description still adds value by explaining that a host id obtained here feeds into universe_list_events.

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 gives a specific verb and resource: it returns the signed-in user plus the host accounts they can manage (team memberships), which matches the 'Who am I' identity purpose. It is clearly distinct from the event/order/attendee listing siblings, though it never explicitly says 'this is the only identity tool, do not expect event data here'.

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?

It provides a concrete chaining instruction — take a host id from the result and pass it to universe_list_events — which tells the agent where this tool fits in a workflow. It stops short of stating when not to call it or what to do if the user has no host memberships.

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