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

With no annotations, the description carries the full behavioral burden; it does disclose the useful trait that the plan is 'deterministic', which tells the agent repeated calls yield identical output. However, it says nothing about read-only safety, error behavior for unknown ids, latency, or whether links/URLs can go stale.

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?

Front-loaded with the verb and the deliverable, and the closing input line is compact. The long content enumeration is dense but informative rather than padded, so it largely earns its space.

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 single-parameter read tool with an output schema, the description is nearly sufficient, and it helpfully previews the plan's sections. The remaining gap is the absence of any guidance on sibling selection and on failure modes for invalid device ids.

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 100%, so the sole device_id parameter is fully documented in the schema, and the description merely restates '1-200 chars'. It adds no meaning such as where to obtain a valid catalog device id or what happens when the id is not found.

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 names a specific verb ('Return') and resource ('complete deterministic build plan') and enumerates the payload contents (parts, shopping list, steps, commands, caveats, brief), so an agent knows exactly what it gets. It never references the sibling tools assess_hackability or plan_gadget, so differentiation from siblings is left to inference.

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 statement of when to use this tool versus the siblings plan_gadget or assess_hackability, and no exclusions or prerequisites beyond the implicit requirement of a catalog device id. The agent must infer the routing decision entirely on its own.

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