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

Annotations already declare readOnlyHint=false, idempotentHint=true and, importantly, destructiveHint=true; the description adds the patch semantics (only supplied fields change), which is genuine value the annotations don't express. However, it never addresses the destructive flag — no warning that existing values for supplied fields are overwritten, and nothing about permission-denied behavior. With annotations covering the safety profile, a 3 is fair.

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 short sentences, front-loaded with the action and scope, followed by the one behavioral rule that matters (partial update). No 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?

For a simple patch tool with full schema coverage and annotations, the description covers purpose, permission scope and patch semantics. It does not explain what is returned (no output schema, so the agent can't know if the updated record comes back) or acknowledge the destructive overwrite implied by destructiveHint=true, leaving meaningful 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 100%, so all 7 parameters are documented in the schema and baseline is 3. The description enumerates four of the six updatable fields but silently omits name and category, so it adds partial rather than complete semantic value on top of the schema.

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 (update) and resource (equipment item) and even names the mutable fields (status, quantity, assigned_to, notes). The resource name clearly separates it from the many update-* siblings (update-project, update-script, etc.), though it doesn't explicitly route to create-equipment-item or get-equipment-item.

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?

"The signed-in user can edit" hints at a permission precondition, and "Only the fields you pass are changed" tells the agent this is a partial update, which is real usage guidance. But there is no explicit when-to-use/when-not or comparison to siblings such as update-filming-location or create-equipment-item; the agent must infer that usage.

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