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

Annotations already cover the safety profile (readOnlyHint=false, destructiveHint=false, idempotentHint=false), and the description adds real context beyond them: copper is preserved, a new design is created, and the new design_id is returned. It stops short of saying what happens on a malformed file or whether a repeated import produces a duplicate design.

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 sentences, zero waste, with the core action and preservation guarantee front-loaded and the return value stated last where it belongs.

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?

There is no output schema, so stating 'Returns the new design_id' is genuinely necessary and supplied here, and all three parameters are documented in the schema. The main remaining gap is failure behaviour (invalid or oversized file), which an agent handling a mutating import would benefit from knowing.

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 name, content and file_name are fully described in the schema, including the 8 MB cap and .kicad_pcb suffix. The description adds no syntax or format detail beyond that, so the 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?

The description gives a specific verb and resource ('Imports a KiCad PCB (.kicad_pcb text) as a new design') plus the key preservation guarantee ('keeping its copper'), so there is no ambiguity about what is created. It doesn't explicitly name a sibling it differs from (e.g. open_in_editor or design_board), which keeps it just below a 5.

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 usage context is implied: you have an existing .kicad_pcb file and want it as an editable design. There is no explicit when-not condition, no mention of alternatives for getting a board in (open_in_editor, design_board), and no guidance on repeated imports.

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