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

No annotations exist, so the description carries the full behavioral burden. It usefully discloses the visibility constraint ('Only publicly listed Spaces appear') and the return fields, but says nothing about result limits, pagination, whether results are ranked, or what an empty query returns — significant gaps for a search tool with zero annotation coverage.

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 tight sentences, front-loaded with the action and scope, then the return shape. No filler or restatement of the tool name.

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 no annotations, the description does cover the return fields and the public-listing filter, which is the minimum. But for a search endpoint it omits result-count behavior, empty-query semantics, and parameter meaning, leaving real gaps.

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%, so the description must explain the single 'query' parameter, and it does not — no indication of what fields are matched, substring vs. semantic matching, or what the default empty string triggers. The only parameter is effectively undocumented anywhere.

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?

States a specific verb and resource ('Search the live Sacrosanct Space marketplace') and enumerates the returned fields, so the agent knows this is a discovery/listing operation. It implicitly differs from get_service_details (cards vs. details) and the purchase siblings, but never names them 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 'Search the live ... marketplace' — an agent can infer this is the entry point before get_service_details or prepare_purchase. However, there is no explicit when-to-use/when-not, no guidance on empty query, and no pointer to which sibling to call next.

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