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

Annotations already cover the safety profile (readOnlyHint=true, idempotentHint=true, openWorldHint=false), so the bar is lower. The description adds genuinely useful behavioral detail beyond them: the return cardinality ('one to three pages') and the shape of each result (title, one-line promise, link), which is valuable 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 sentences, zero filler. The purpose and return shape come first and the usage guidance follows, which is the right front-loading for a lookup tool.

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?

With no output schema, the description appropriately describes what comes back (one to three pages with title, promise, and link), and the annotations handle safety. It is essentially complete; only minor behaviors like no-match handling or ranking criteria are unstated.

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% and the schema itself gives a clear example ('why octopuses are so smart') plus length bounds, so the baseline is 3. The description adds only the loose framing of 'short-video idea' and no format, syntax, or constraint detail beyond the schema.

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 ('Find') and resource ('the Veedio tool page') plus the domain (short-video ideas), which is far more precise than the title alone. It implicitly contrasts with the sibling short_video_outline (which would produce an outline rather than a tool page), but never names or differentiates it 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?

Gives a concrete trigger condition: 'Use it when someone asks which tool or format to use for a video idea.' This tells the agent exactly what user intent maps to this tool. It does not state when-not to use it or point to the sibling as an alternative path, so it falls short of a 5.

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