Display colours

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

With no annotations, the description carries the full burden and does disclose key behavior: values persist to the supply's EEPROM, a firmware version gate applies, and reset=true restores vendor defaults. It stops short of saying whether supplied colors merge with or overwrite existing element settings, and doesn't state error or connection requirements.

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?

Extremely dense and front-loaded: action, firmware gate, persistence, value formats, element list, then reset semantics. The telegraphic 'colors: {...}' notation is terse but readable; no sentence is wasted.

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 3-parameter nested-object tool with no output schema, the definition covers formats, valid keys, persistence, firmware requirement, and the reset path. Only the merge-vs-replace semantics and confirmation of the response are missing, which are minor given no output schema exists.

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 only 33%, and the description compensates well: it gives the accepted color value syntaxes (#RRGGBB, 0xRGB565, or name) and enumerates all ten valid element keys, which the schema does not. The third parameter, max_wall, is documented in the schema itself, so nothing major is left unexplained.

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 ('Set colours of the Digital screen'), which is clearly distinct from generic siblings like set/output/status. It does not explicitly name a sibling alternative, but the resource specificity is enough for an agent to route correctly.

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 firmware prerequisite (>= 1.4.4) and the reset=true default-restore path give implied usage context, but there is no explicit when-to-use vs when-not guidance and no mention of alternatives such as `set` or `output`. Usage is inferable rather than stated.

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