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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and closed-world, so safety is covered. The description contributes one genuinely useful behavioral fact — that MCP preserves the upstream score and decision without alteration — but says nothing about permissions, latency, or what a failure/empty result looks like.

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 with the primary inputs front-loaded and the narrowing options immediately after. The only waste is the undefined in-group term 'Abyar', which costs clarity without adding information.

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, no parameter descriptions, and five parameters, the definition leaves the agent guessing about the return shape (scores? decisions? a variety list?), the meaning of limit, and how to obtain a valid fingerprint_key. For a domain-specific policy tool this is a substantial shortfall.

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% across 5 parameters, so the description must carry the burden and does not. It names crop, fingerprint, cultivar and rootstock in prose but never explains that fingerprint_key is a 64-hex-character environmental fingerprint (nor which sibling produces it), and 'limit' (1-50) is never mentioned at all.

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 verb is clear ('Run ... policy') and the resource is named ('variety-fit'), plus the inputs are sketched (crop, environmental fingerprint, optional cultivar/rootstock). But 'canonical Abyar variety-fit policy' is jargon that never says what the tool actually returns — a score, a ranking of varieties, a pass/fail — and it is not distinguished from the sibling abiyar_assess_suitability, which sounds like the same job.

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?

There is no statement of when to use this versus abiyar_assess_suitability, abiyar_get_varieties, or abiyar_context, and no prerequisites or exclusions. The only conditional in the text ('optional cultivar/rootstock narrows context') describes parameter behavior rather than tool selection.

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