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

With no annotations, the description carries the full behavioral burden and delivers none of it. It does not state whether this is a partial update (are omitted fields preserved?), whether the Watch must belong to the caller, whether changes are reversible, or why a required user_request accompanies every mutation.

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 zero waste, but the terseness is close to under-specification rather than disciplined concision — there is nothing to front-load because nothing extra is said.

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?

A six-parameter mutation tool with no annotations and no output schema needs the description to explain update semantics and the purpose of the mandatory user_request. Neither is covered, leaving the agent to guess at behavior that matters for calling it correctly.

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 83%, so the properties (line, note, stat enum, player, user_request) are already documented in the schema. The description adds no meaning beyond that — notably it never explains the unusual required user_request field or confirms that only supplied fields change. 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?

"Change fields on one of your Watches" gives a specific verb (change/update) plus a specific resource (Watches), and the plural sibling set (create_watches, delete_watches, get_watches) makes the CRUD role obvious. It stops short of saying which fields are updatable or what a Watch represents, so it is clear but not maximally distinguishing.

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 when-to-use guidance, no exclusion of alternatives, and no stated prerequisites. The agent must infer that an existing Watch id is required and that creating or removing Watches belongs to create_watches/delete_watches, rather than being told.

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