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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false, and openWorldHint=false, so safety is covered. The description adds genuine context beyond that: the exact data sections returned (profile, apps, subscription, credits), that pagination applies only to apps, and that the token comes from a prior call. It stops short of describing response shape or whether a token expires.

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, front-loaded with the tool's purpose before the parameter branches. The trailing 'MCP version 2.12' line is not filler — it supplies the literal value required by the mcp_version parameter's pattern and description.

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 burden of telling the agent what comes back, and it does: profile, apps, subscription, and credits, split by profile_only. Combined with full schema coverage and complete annotations, the only gap is pagination specifics (token lifetime, whether the app list is exhaustive).

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 description coverage is 100%, so all four parameters are already documented in the schema, including defaults, max limit of 100, and the continuation token source. The description restates profile_only and pagination behavior rather than adding new semantics, which lands at the baseline for a fully-documented 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?

The description names a specific verb and resource: inspecting the signed-in account plus apps, subscription, and credit balances, so the agent knows exactly what data this tool surfaces. It does not, however, explicitly distinguish itself from the sibling get_apps, which also returns app data via pagination, leaving a small ambiguity about which to pick for a pure app listing.

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?

Clear conditional guidance is given for the main branch: set profile_only:true for identity only, omit it to include billing and credits, and use limit/continuation_token to page apps. What's missing is any exclusion or routing statement against get_apps or get_app_status, so the when-not guidance is incomplete.

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