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

Annotations already cover safety (readOnlyHint, idempotent, non-destructive), and the description adds genuinely non-obvious behavior: deletion is impossible through tools and must be done by the human in website Settings, created_by_this_app identifies the app rather than the agent, and returned names/descriptions are untrusted data. That is real value beyond the structured fields, though it omits any note on response shape or size.

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 content is front-loaded, but it is delivered as one long run-on sentence that stacks a dozen return fields before reaching the behavioral notes about setup, untrusted data, deletion, and skills_revision. It would read far better broken into a returns list plus separate behavior notes; as written, the agent must parse dense clauses to extract anything.

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 carries the full burden of describing return content, and it does so in detail, plus handling setup state, deletion policy, and the skills_revision staleness check. The only gap is that the return description is prose rather than structured, so an agent cannot tell field names or nesting from it.

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, so the schema baseline of 4 applies. The only parameter-like reference is namespace_id, which belongs to the sibling create_address, not this call.

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 precisely what the call returns: the calling Connection, address prefixes, active/archived addresses with creator/last-user app, fetch timestamps, wake-ups with status, wake_up_form, and the app's wake-ups. That is far more specific than the bare title 'Get Account'. It does not, however, distinguish itself from siblings like get_overview or get_reception, leaving the agent to infer which read tool to pick.

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?

Usage is only implied: the agent is told to follow setup steps until an address exists, and to pass an id as namespace_id to create_address. There is no explicit statement of when to call this versus get_overview or get_reception, and no exclusions. A competent agent can infer it is the Account-level read, but the definition never says so.

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