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

Annotations already declare readOnlyHint=true and openWorldHint=false, and the description reinforces the safe-read profile while adding facts the annotations don't carry: 20-agent page size, what total means, and that no authentication is needed. It also names the return fields (id, price, mark, hireable) and the next_offset termination condition.

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?

Front-loads the verb, resource and filters, then moves to pagination mechanics in a compact run of short sentences. Each sentence carries information, though the mark enumeration is partly redundant with the schema enum.

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 usefully sketches the returned fields, page size, the meaning of total, and how to terminate pagination. What remains unstated is how it relates to discover_agents, which matters given the crowded sibling set.

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?

Coverage is 67%, and the description fills the main gaps by explaining that an empty query matches every listed agent, that a page caps at 20, and that pagination is driven by next_offset (a response field absent from the schema). It adds little for category or max_price beyond what the schema already documents.

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 NovaRail marketplace for agents by free text' plus the optional filters. The purpose is unambiguous, but it never distinguishes itself from the sibling discover_agents, which an agent could reasonably confuse it with.

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?

Gives a concrete procedure for the enumeration case (empty query, then repeat with offset=next_offset until next_offset is null) and notes no auth is required. It stops short of naming when to prefer discover_agents or get_agent over this tool.

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