Create and save a WeChat draft

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

Annotations only signal that the tool is not read-only, not idempotent, and not destructive. The description adds meaningful behavior: 'The draft is saved but never published' and 'Requires confirm=true', which are not captured in annotations. It could add more about auth or error behavior, but the added context suffices.

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 four short, purposeful sentences. Each sentence adds distinct information: purpose, dependency, requirement, and outcome. There is no wordiness or redundancy.

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?

The description covers the core workflow: prerequisites (cover media IDs), the safety mechanism (confirm=true), the limit (8 articles), and the outcome (saved draft, not published). It does not mention return values or error handling, but given no output schema and a straightforward creation operation, this is reasonably complete.

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%, so the description partially compensates. 'Uses cover media IDs from prior uploads' adds meaning to the cover_media_id parameter by explaining its source, and 'Requires confirm=true' clarifies the confirm safety gate. However, response_format remains undocumented, so it does not fully compensate for all gaps.

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 clearly states the verb ('Create and save'), the resource ('draft'), and the scope ('up to 8 articles', 'logged-in WeChat Official Account'). It also distinguishes from siblings by emphasizing the draft is never published, separating it from publishing or reading 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?

The description provides clear context: it requires cover media IDs from prior uploads and confirm=true, indicating this is used after uploading images and before publication. It does not explicitly name alternative tools or when not to use, but the workflow is implied.

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