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

With no annotations provided, the description carries the full burden of behavioral disclosure. It reveals that this operation publishes a new immutable style version, which implies the existing style version is not mutated, and it states the return value. It could additionally mention side effects like publication visibility, but the core behavior is clear.

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?

The description is a single dense sentence that front-loads the action, includes a concrete example, covers input sources and colour syntax, and states the return value. There is no fluff or repetition of schema content.

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?

The description covers what the tool does, how to find slot names, allowed colour formats, and the return value. Since an output schema exists, detailed return documentation is unnecessary. A brief note drawing the boundary against set_layer_paint would make it fully complete, but nothing essential is missing.

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 coverage is 100%, so the baseline is 3. The description adds value beyond the schema by enumerating accepted CSS colour formats (#rgb, #rrggbb, #rrggbbaa, rgb(), hsl()) and providing a concrete example of the colours object. This helps the agent construct valid parameter values.

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 description states a specific action ('Recolour one or more palette slots'), a specific resource ('hosted style'), and a distinctive outcome ('publish the result as a new immutable style version'). It clearly separates this from siblings like set_layer_paint by focusing on palette slots rather than layer paint properties.

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 description gives clear operational context: it tells the agent to obtain slot names from list_style_layers and explains how colours should be formatted. It does not explicitly compare against siblings such as set_layer_paint or create_style, so exclusion guidance is implied rather than stated.

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