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

With no annotations, the description carries the full burden and does well: it discloses auth requirements ('Requires Authorization: Bearer <api_key>'), cost ('Costs 1 credit(s)'), pricing unit ('Credits unit: page'), and the pagination page size (~100). It lacks detail on error behavior or rate limits, but covers the key operational traits.

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 first sentence front-loads the purpose well, but the description is a stitched-together set of boilerplate lines with redundancy: 'Priced per page..' (double period) and 'Credits unit: page' restate the same pricing fact twice. Several sentences are fragmented and could be consolidated.

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?

No output schema or annotations exist, so the description must stand alone — and it adequately covers purpose, prerequisites, auth, cost, and page size. Return-field structure is not described, but for a paginated listing tool the operational essentials are present.

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%, so all three parameters (id, cursor, sec_uid) are already fully documented with examples. The description reinforces the provenance of id and sec_uid ('from User Info') but adds no syntax or format meaning beyond the schema, fitting the baseline.

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 — 'Fetch a page of accounts a user follows (~100)' — which is clearly distinguishable from the sibling tiktok_followers (accounts following the user). Scope (~100 per page) is included. It stops short of an explicit sibling callout, but the following/followers distinction is inherent in the wording.

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?

Provides clear prerequisites: 'Needs id and sec_uid from User Info,' routing the agent to the correct upstream tool for parameter acquisition. It does not state when-not to use it or name tiktok_followers as the alternative, so it falls short of full 5-level when/when-not guidance.

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