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

Annotations only say readOnly/no-destroy, so the description usefully adds that results are team-scoped when signed in for a team ('the plan and counts are then the team's'), that comp plans are distinguished from paid, and that there is no balance to report. It stops short of stating that the call takes no input or that output is a fixed snapshot, and several disclosed fields duplicate the output schema.

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 purpose is front-loaded, but the opening sentence runs on through a long comma-chained inventory of return fields (email, team, role, plan, comp status, project counts, always-on limits, plugin_version, plugin_note) that the output schema already encodes. Roughly a third of the text is redundant with structured data.

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?

Because an output schema exists, the description need not define return values, yet it still supplies the interpretive context an agent needs: team-vs-personal scoping, comp vs paid, always-on counting across all covered apps, and the plugin_note comparison advice. Nothing required to call this zero-arg tool correctly 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, which is the baseline-4 case; there is nothing for the description to disambiguate. It correctly implies a pure no-argument introspection call, though it never says so explicitly.

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 precise verb and resource: 'Report which spawnpoint account this session is authenticated as,' then enumerates the exact fields surfaced (email, team, role, plan, active projects, always-on apps, plugin_version). No sibling tool does identity or plan introspection, so it is trivially distinguishable from the list/deploy/storage siblings.

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 two concrete triggers ('when the user asks whose account is connected or what plan they are on') plus a proactive one ('before offering to keep an app always on'), which explicitly couples it to the set_always_on sibling. It also routes the agent away for the adjacent need: 'users manage billing in the console,' effectively a when-not.

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