get_channel_overview

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

The readOnlyHint annotation already signals safety, and the description adds useful behavioral context by disclosing that results are cached locally and that refresh=true bypasses the cache. There is no contradiction with the annotation.

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 description is two tight sentences. The first front-loads what the tool returns and for whom; the second clarifies the only parameter behavior that matters. No unnecessary words.

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 simple read-only tool with one optional parameter and an output schema, the description covers all essentials: scope, returned fields, and caching behavior. Return-value details are already covered by the output schema.

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 schema provides only a bare boolean with a default and no description, so the description carries full responsibility for explaining refresh. It does so explicitly: 'pass refresh=true to bypass the cache.'

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 verb-resource pair: it gets basic stats of the authenticated owner's YouTube channel, and enumerates the exact fields returned (subscribers, total views, video count, uploads playlist id). However, it does not explicitly contrast this with the sibling get_channel_metrics, so some differentiation is left implicit.

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?

No guidance is given for when to choose this tool over get_channel_metrics, list_videos, get_retention_curve, or analyze_pillar_performance. The only usage note is about refresh=true and caching, which addresses parameter behavior rather than tool selection.

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