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

Annotations already declare readOnlyHint=true, openWorldHint=true and destructiveHint=false, so the safety profile is covered. The description adds that this makes a live request to an external body ('Ask CAC now') and that results are also delivered asynchronously as system events, which is useful context, but says nothing about latency, failure behavior when CAC is unreachable, or rate limits.

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 short sentences, front-loaded with the action and immediately followed by the scoping constraint. Slightly informal phrasing ('with them', 'Ask CAC now for the latest') is understandable but marginally less precise than it could be.

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 one-parameter read tool with no output schema, the description covers the core action but omits what the refreshed status contains and how failures are surfaced. It also leaves the sole parameter's meaning undefined, so it is adequate rather than 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?

Schema description coverage is 0% and the single parameter business_id is undocumented in both schema and description. The agent cannot tell whether this is the internal workspace business id or a CAC registration number, which is a meaningful ambiguity for a tool that calls an external registry.

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 states a specific action and resource: fetch the latest CAC status for a registration currently lodged with CAC, and it scopes applicability to registrations that are 'submitted or queried'. This distinguishes it reasonably from state-reading siblings like get_registration_state, though it never names that sibling explicitly.

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 implied by the parenthetical '(submitted or queried)', which tells the agent when the tool is meaningful. The note that changes also arrive as system events hints that polling may be unnecessary, but no explicit alternative tool or 'do not use when' condition is given.

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