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

Annotations already declare readOnlyHint and closed-world, so safety is covered; the description adds substantive behavioral context by disclosing the actual payload shape (per-stage days, dual-unit temperatures, FAE, light hours, chamber tips, sources), which matters because there is no output schema. It stops short of stating behavior on a missing/unknown slug.

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 a dense but scannable enumeration; the parenthetical examples could be trimmed since the schema repeats them, but nothing is filler.

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 one required parameter, no output schema, and safety covered by annotations, the description does the work that matters by describing return contents in detail. Only the error/not-found case is unaddressed.

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 100% and already explains the slug format, the list_profiles source, and that a plain name works. The description's 'by slug' plus inline examples largely duplicate that, adding no new parameter guidance. 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?

States a specific verb and resource ('Get the full grow recipe for one mushroom by slug') and enumerates exactly what the profile contains (stages, days, temp in C/F, humidity, fan, light hours, tips, sources). An agent can distinguish this from list_profiles (which enumerates slugs) without inspecting schemas.

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?

'for one mushroom by slug' implicitly contrasts with the list_profiles sibling and the slug example hints at a two-step flow, but no when-to-use/when-not and no mention of get_chamber_guide or grow_timeline, which plausibly overlap. Usage is inferred rather than stated.

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