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

With no annotations, the description carries the full burden and does disclose the ordering implied by "newest videos" and the truncated return content ("the start of its description"), which the input schema cannot convey. It stops short of stating pagination behavior for offset/limit or whether a total count is returned, which is the main remaining gap for a read-only listing tool.

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: the first front-loads scope and return contents, the second covers filtering and the alternative routing. No filler, no repetition of the tool name, and the disambiguation comes last where it is most useful.

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 read-only listing tool with four optional parameters and no output schema, the description covers purpose, filterable dimensions, returned fields, and siblings well enough to call it correctly. The omission of limit/offset paging behavior is the only meaningful hole.

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 description maps to only two of the four parameters (channel and date via "Filter by channel or date"), while limit and offset remain undocumented in both description and schema. With 50% schema coverage, the description partially compensates but leaves paging semantics unexplained.

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 specific verb and resource ("newest videos of the NEAR Protocol, NEAR DevHub and NEAR AI YouTube channels"), enumerates the content types (talks, interviews, livestreams, workshops), and describes what each item carries (date, start of description). This makes it immediately distinguishable from search and semantic_search.

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?

Explicitly names what the tool is for (browsing newest videos, filtered by channel or date) and routes subject-based queries to named alternatives: "use search with type youtube, or semantic_search." The selection condition between browsing and searching is stated, not inferred.

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