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

Annotations already declare readOnlyHint, idempotentHint and non-open-world, so the safety profile is covered. The description does add real behavioral context beyond that: results are merged from two sources (plan slots plus the user's own scheduled videos), rendered in the audience's time zone, and the per-slot allowed actions depend on the current mode. It stops short of covering limits, ordering or what 'warnings' and 'status' mean.

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?

The purpose is front-loaded in the first clause, which is good, but the sentence then unrolls a long parenthetical field dump (idea, angle, format, role, hook, ending, keyword...) that is expensive to scan. A short structured list or a trimmed enumeration would carry the same information more cheaply.

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 correctly takes on the burden of describing the return payload and does so thoroughly, including side data (weekly plan explanation, per-slot permissions). The remaining gaps — the meaning of status/warnings and the behavior of the unscoped project parameter — are minor rather than blocking.

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 coverage is 67%, and the description only reinforces the 'from'/'to' semantics via the default period. The 'project' parameter — the one undocumented in the schema — is only obliquely implied by "The project's calendar"; it never says whether omitting it defaults to the current project or spans all projects.

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 states a specific resource (the project's calendar for a period) and enumerates exactly what it returns: weekly plan slots, the user's scheduled videos, the current weekly plan and per-slot permissions. It is distinguishable from get_plans and list_videos by the calendar/period framing, although it never explicitly contrasts itself with those siblings.

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?

There is no statement of when to use this tool versus get_plans, get_best_times or list_videos, nor any prerequisite or exclusion. The only guidance is the implicit default window ('today and the next 7 days'), which is helpful but does not route the agent between alternatives.

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