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

Beyond the annotations, the description discloses downstream effects ('shown on quotes and the inquiry form'), full-replacement semantics, and an authorization requirement ('Needs the owner's sign-in') that the agent otherwise would not know. This is meaningful added context for a write tool. The one tension is that 'Replaces the list' implies existing data can be overwritten while destructiveHint=false; the description does disclose the replacement, so it informs rather than contradicts, but it does not spell out the result of omitting the spaces list entirely.

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 with the resource described first and consequences after; nothing is padded. The elliptical 'The event spaces and how many each holds' opener is slightly awkward as an opening clause but conveys the payload shape efficiently.

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 and only 50% schema coverage, the description covers authorization and downstream visibility well for a write tool. It omits two things an agent needs for correct invocation: what an empty or omitted spaces array does to existing venues, and what capacity means when not supplied, which matters because no parameters are required.

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 50%: notes and the nested name field are documented, but the spaces array itself and capacity carry no schema descriptions, and maxItems 50 is unexplained. The phrase 'how many each holds' does add real meaning to capacity (per-space headcount used on quotes), which the schema does not state, so the description partially compensates but not fully.

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 identifies the exact resource being configured ('the event spaces and how many each holds') and where it surfaces (quotes and the inquiry form), so an agent can match it to the 'Set the event spaces' title without ambiguity. It is a noun phrase rather than an explicit verb, and no sibling tool is named, but none of the siblings (house_inventory, set_company, set_team) overlap enough to create confusion.

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?

The most important usage signal is present: 'Replaces the list' tells the agent this is a full overwrite rather than an incremental add, which changes how it should be called. There is still no explicit when-to-use versus alternative guidance and no statement about what happens if a partial list is passed, leaving the caller to infer the destructive consequence of an incomplete payload.

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