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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the bar is lower. The description adds genuinely useful behavior context: it is free, requires no API key, and nothing is stored or posted, which confirms the dry-run nature. It says nothing about rate limits, latency for multi-language generation, or what the preview actually returns.

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 sentences, front-loaded with the capability and closed with the critical no-cost / no-persistence guarantee. No filler, and the most decision-relevant fact for an agent (this is a free, non-destructive preview) lands where it will be read.

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 2-parameter, non-destructive preview tool this is nearly complete: inputs, cost, key requirement, and side effects are all covered. The one gap is return shape — with no output schema, the description never says what a "preview" looks like (per-platform posts, per-language variants), leaving the agent to infer the response.

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%: url already documents "Page to write from, e.g. a launch post or changelog entry" and languages already documents BCP-47 tags and the allowed list. The description only echoes "any public page" and "up to 3 languages", adding no syntax or constraint detail beyond the schema, so baseline 3 applies.

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+resource ("Write native posts for X, LinkedIn and Threads from any public page") plus platforms and scope, and the final sentence ("Nothing is stored or posted") makes clear this is a dry-run preview rather than a publish action. It separates itself from amplify_schedule_posts and amplify_create_campaign by behavior rather than by naming them, which is slightly weaker than an explicit contrast.

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?

"so the user can see what RankRoot Amplify would publish" plus "Free, no key" gives clear context for when to reach for this: a no-cost, no-setup trial of Amplify output before committing to a campaign. It stops short of explicitly routing the agent onward to amplify_create_campaign or amplify_schedule_posts once the preview is approved.

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