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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds genuine value beyond that by disclosing the guide's content scope (billing rules, privacy, connection methods) and that it also surfaces links to the app, site and support — the agent knows what kind of payload comes back in the absence of an output schema.

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?

A single front-loaded sentence with no filler: the core purpose comes first, then the topic list. The list is long but each item maps to a real section of the guide, so it earns its space.

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 static documentation-retrieval tool with no output schema, the description sufficiently covers scope, content topics and supporting links. The only notable omissions are when-to-use guidance and confirmation of the returned format, which are minor given the tool's simplicity.

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 single `language` parameter has 100% schema description coverage with an explicit enum (en/ru) and a default documented in the schema, so the schema does the heavy lifting. The description never mentions language selection or the default, adding nothing beyond the structured field — baseline 3 applies.

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 names the resource (a renting guide for EvaFarm) and enumerates the exact topics it covers — sign-in, projects and wallets, billing, remote-connection via AnyDesk/RustDesk, teams, privacy. That is enough for an agent to know this returns a documentation payload rather than acting on nodes. It stops short of differentiating from siblings, but those (estimate_cost, get_node, list_nodes, service_status) do not overlap in intent, so the risk of confusion is low.

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: an agent can infer 'call this when the user needs onboarding/renting documentation', but the description never states when to prefer it or what it does not cover for. No alternatives or exclusions are given, and no prerequisites (e.g. does it need auth?) are mentioned.

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