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

Annotations already declare readOnlyHint, idempotentHint, and non-destructive, so the description's "Read-only" is reinforcement rather than new information. The added context is genuinely beyond the annotations: it scopes results to the authenticated account's own enrolled devices and notes it does not reserve quota, which matters for agents chaining into session tools.

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?

Two sentences, front-loaded with the sequencing instruction and then the payload description. No filler, nothing repeated from the title.

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 carries the return-value burden and does so at a useful level of abstraction: account identity, enrolled devices, online status, approved workspaces, quota untouched. It does not describe shape or per-device fields, but for a no-parameter discovery tool this is close to complete.

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 correctly implies no filtering arguments exist, which is consistent with the empty schema.

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 (list paired devices and their approved workspaces) plus the online-status field, and explicitly positions itself against the sibling execution_session_open. An agent can tell exactly what it gets 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?

"Use this first, before execution_session_open" gives explicit ordering and names the alternative it precedes, which is precisely the decision an agent faces here. It stops short of saying when the tool is unnecessary, but the prerequisite framing is clear.

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