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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world), so the description's job is to add context, which it does: it flags that link recipes render 'in the browser that opens the link' and that media hosting carries CORS considerations and platform limits. Those are behavioral caveats an agent would not learn from the annotations alone. Return shape is not described, but an output schema exists, so that gap is acceptable.

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 short segments, with the imperative 'Read first' front-loaded ahead of the topic list. The parenthetical about browser rendering is the only dense part, and it earns its place by qualifying how link recipes behave.

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 zero-parameter guide tool with full annotations and an output schema, the description supplies adequate scope: it tells the agent what domains the documentation covers and what constraints (CORS, limits) to expect. Nothing essential to calling it is missing.

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 tool takes no parameters, so there is nothing for the description to disambiguate; baseline 4 applies. No misleading parameter hints are present.

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 this as an instructional/readme resource ('How bots make videos') and enumerates the topic areas it covers: video-by-link recipes, templates, styles, edit plans, media hosting, and limits. That is enough to distinguish it from the actionable siblings (build_video_link, list_video_styles, validate_edit_plan), though the phrasing 'How bots make videos' is slightly indirect about the fact that it returns documentation rather than performing an action.

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?

'Read first' gives an explicit ordering cue that places this ahead of the video-building siblings. It does not name a specific alternative tool or state what to do after reading, but the sequencing guidance is clear and actionable.

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