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

Annotations already establish readOnly and non-open-world, so the bar is lower; the description usefully adds result ordering. It does not disclose the default result count, what happens when limit is omitted, or what fields each returned tool carries, which matters since there is no output schema.

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 tight sentences, front-loaded with what the list contains and ordered so the filtering rule follows the main purpose. No wasted wording, though it could have spent one clause on the undocumented limit.

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?

It is a simple read-only listing tool with only two params and no output schema, so the essentials are covered. Still, with no output schema the description should say something about what a returned entry looks like and how limit affects the response, which it omits.

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 0%, so the description must carry the parameter burden. It explains `since` well (format YYYY-MM-DD, inclusive lower bound), but leaves `limit` entirely unexplained — no default, no note that it caps at 50 — so half the parameters remain undocumented.

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 concrete resource (tools) and a specific ordering criterion (date Fourth Feed first saw them, newest first), which separates it from siblings like search_tools or compare_tools. The only weak point is that the 'first saw them' framing depends on knowing what the source catalog tracks, but the operation is still unambiguous.

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?

Gives a clear trigger for the optional filter ('pass since ... to get only those first seen on or after that day'), which is effectively a when-to-use condition. It does not name an alternative tool or say when not to use this one, but the ordering-based purpose is clear enough that an agent can self-select.

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