whatsapp_create_newsletter

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

Annotations already declare the write/open-world/non-idempotent/non-destructive profile, so the bar is lower. The description adds two genuinely useful facts beyond structured fields: that the channel becomes public immediately on creation, and that it returns the new channel JID.

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?

Two compact sentences, front-loaded with the core action and followed by the consequence and return value. No filler or redundant restatement.

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, mentioning the returned JID is valuable, and the public-on-creation consequence covers the main non-obvious behavior for a mutation tool. A note on session/permission prerequisites would make it fully 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 100%, so the schema already documents name, picture, and description. The description only restates that description and picture are optional, adding no format or syntax detail beyond what the schema provides. Baseline 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 (Create) and resource (WhatsApp channel/newsletter), and resolves the terminology ambiguity by equating 'channel' with 'newsletter'. It also specifies ownership scope ('owned by this number'), which distinguishes it from read-side siblings like whatsapp_list_newsletters and whatsapp_get_newsletter.

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 'Create a new WhatsApp channel', but the description never states when to use this versus alternatives, nor any prerequisite such as requiring an active session. No exclusions or 'when not to use' guidance is provided.

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