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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so safety and idempotency are covered. The description adds only the scoping fact that attachment content is excluded; it says nothing about authentication, size limits, or what happens with a missing/invalid email ID.

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?

A single short sentence, front-loaded with the resource and carrying one useful qualifier. There is no filler or redundancy to trim.

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 must convey what 'metadata and headers' actually contains, and that term is left vague. Given the density of sibling email getters, a brief note on what fields are returned would make the definition 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?

There is a single required parameter with 100% schema description coverage ('Email ID (em_xxx)'), so the schema fully documents it. The description adds no additional meaning about the ID beyond the schema, which is the baseline-3 case.

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 ('Return email metadata and headers') and adds a scope limiter ('without attachment content') that separates it from get-email-attachments. It does not differentiate itself from close siblings get-email, get-email-body, or get-email-raw, so an agent still has to infer which getter to pick.

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 phrase 'without attachment content' implies you should use this when attachments aren't needed, but there is no explicit when-to-use or when-not-to-use guidance and no named alternative. Against four sibling email-reading tools, the routing guidance is only implied.

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