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

With readOnlyHint/openWorldHint already declaring the safety profile, the description adds real behavioral detail beyond annotations: test accounts expose label and email but 'never a password', has_store_password reveals only a boolean, and each app reports whether a check 'can run now' and its usual_price_usd. It does not cover volume, truncation, or whether `plan` is always present.

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?

It is one long run-on sentence with nested parentheticals and backticked field names, which is hard to scan. The length is partly justified because no output schema exists and every clause describes a returned field, but the structure could be split into purpose / app fields / plan / Shopify blocks without losing content.

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 tool with no output schema, the description carries the return-value burden thoroughly, including the nested `plan` object and the extra Shopify fields, so an agent knows what it will receive before calling. Missing only edge-case behavior such as empty teams, pagination, or error conditions.

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?

Schema coverage is 100% and the single `team` parameter is fully documented in the schema (name or id, whoami as the source, default of the key's own team). The description itself says nothing about the parameter, so it adds no meaning beyond the structured field — baseline 3.

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 enumerates exactly what the call returns — apps with id, address, scenarios, limits, allowed origins, test accounts, recurring-check state, last run — plus a `plan` block and Shopify-specific fields. There is no explicit verb ('list'), but the name and the returned inventory make the resource unambiguous, and 'Start here' positions it as the orientation call among 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?

'Start here.' gives an explicit entry-point instruction, and the team parameter text routes the agent to whoami when it needs a team id. It stops short of naming exclusions (e.g. when to use list_scenarios or get_verdict instead of reading scenarios off this payload), so there is clear context but no when-not guidance.

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