Profile

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

Annotations declare it non-read-only, open-world, non-idempotent, non-destructive; the description usefully explains the odd readOnlyHint=false by disclosing that it 'Potentially consumes paid API credits; requires confirm=true' and that read-like POSTs do not publish. That clarifies economics and side effects beyond the annotation flags, though it omits rate limits and the caching behavior that lives only in the 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?

Three sentences, front-loaded with the purpose and then the return fields, then the credit warning. The return enumeration is long but earns its place given no output schema exists; nothing is redundant.

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 carries the return-value burden well by naming the top-level fields and sub-objects. It also covers credit cost and the confirm gate, leaving only minor gaps (caching interplay, pagination/size limits) for an otherwise complete read-tool definition.

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 100%, so handle, account, confirm, and cache_max_age are already documented in the schema. The description only restates the confirm requirement and adds no new syntax or semantics for the parameters, so the baseline of 3 is appropriate.

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 ('Retrieves a Twitch user's public profile by handle') and enumerates the returned content, so the agent knows exactly what it gets. It does not, however, distinguish itself from Twitch siblings like twitch_user_videos or twitch_clip, even though it returns allVideos and featuredClips that overlap with those tools.

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?

Usage is implied by 'by handle' and the confirm/credit warning, but there is no explicit when-to-use, when-not-to-use, or pointer to an alternative Twitch sibling. The agent must infer that this is the aggregating profile call rather than the narrower video/clip tools.

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