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

No annotations are provided, so the description carries the burden of behavioral disclosure. It does add useful context: the registry is free, contains founding machines, and is ordered by arrival. However, it does not explicitly state that this is a read-only operation or describe what the response contains.

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 one concise sentence that front-loads the core purpose and includes a relevant cost signal. Every part earns its place, with no redundant phrasing.

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 simple read-style tool with one optional parameter, the description covers the essential subject and ordering. However, without an output schema or annotations, it leaves the return shape, pagination behavior, and exact semantics of 'founding machines' implicit.

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 input schema fully documents the single optional 'limit' parameter, including its default of 25 and allowed range, so schema coverage is 100%. The description does not add parameter-specific meaning, but the baseline of 3 is appropriate when the schema already handles parameter documentation.

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 identifies a specific resource — the Founding Machines registry — and states the ordering (arrival order). It lacks an explicit verb like 'returns' or 'lists', but the tool name and 'registry' make the read/list purpose clear. It does not explicitly differentiate itself from siblings, so it stops short of 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 only usage-related signal is 'Free', which hints that this operation has no cost, but it does not say when to prefer this tool over siblings like get_wall or list_unclaimed. There is no mention of alternatives, exclusions, or conditions for use.

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