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

With no annotations, the description carries the full burden. It does disclose the composition of the payload (theme design skill + shared sections skill) and lifecycle guidance (once per project), which is real behavioral context. However it never says what is actually returned or what happens when the target already has a skill file, which matters for a tool whose output is written to disk.

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?

One front-loaded sentence stating what it is and what it contains, plus one short ordering instruction. The nested parenthetical is dense but each clause earns its place; 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?

No output schema, and the tool's whole point is producing content the agent writes into a project, yet the return shape and the meaning/format of `theme` are unmentioned. The sequencing and payload composition are covered, but the definition is not complete enough for confident invocation on the theme argument.

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 description adds nothing about parameters: the `target` semantics already live in the schema (50% coverage), and `theme` — the sole required parameter — is never explained (e.g. whether it is a name or an ID from list_themes). For a required parameter with no schema description, the description should compensate but does not.

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 companion skill for a theme, to write into the project" names a specific resource (a skill bundle) and its intended use, and the parenthetical enumerates contents (typography, colour, spacing, components, shared Lexington sections skill). It is distinguishable from get_design/get_guidelines by being a bundle emitted into the project rather than a live query, though the contrast is implicit rather than stated.

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?

"Call once per project after the first get_sections" gives explicit ordering, cardinality, and a triggering event, and "without calling this server" clarifies the ongoing benefit. It stops short of saying when to prefer get_design or get_guidelines instead, so it lacks explicit alternatives/exclusions.

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