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

With no annotations, the description must carry the behavioral burden, and it does disclose meaningful scope: only public and officially verified worlds are returned, so private or unverified content is excluded. However, it says nothing about pagination, result limits, ordering, no-auth-required status, or what a returned world record looks like.

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?

A single front-loaded sentence with no filler, which is appropriate for a simple list tool. The one weak spot is the unexplained '@domain:tag' notation, which adds ambiguity rather than value for a reader who hasn't seen the library.

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 two-optional-parameter read-only list tool with no output schema and no annotations, the description covers what is listed and its visibility scope, which is the essential part. It stops short of describing return contents, ordering, or result-size behavior, which an agent needs to plan a follow-up call correctly.

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 both optional parameters are already documented with examples. The description adds only the '@domain:tag' notation for world identity, which hints at the domain parameter's vocabulary but does not explain how 'domain' and 'search' interact or whether search covers tags.

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 ('List') and a specific resource ('public and official verified Small Worlds'), plus scope qualifiers that tell the agent this is a discovery/enumeration tool. Siblings like syntropy_get_world_axioms retrieve content for one world, so the distinction is inferable, though the description never names them explicitly.

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?

Usage is only implied: an agent can guess this is the entry point for discovering worlds before calling syntropy_get_world_axioms. There is no explicit 'use this when...' statement, no mention of prerequisites, and no guidance on choosing between the optional domain filter and keyword search.

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